Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • 1995-1999
  • 1990-1994  (10,430)
  • 1985-1989  (18,430)
  • 1965-1969  (9,673)
  • 1940-1944
  • 1890-1899
  • 1880-1889  (2,955)
  • 1870-1879  (548)
  • 1860-1869  (821)
  • 1992  (10,430)
  • 1989  (9,799)
  • 1988  (8,631)
  • 1969  (4,910)
  • 1967  (4,763)
  • 1889  (1,066)
  • 1887  (1,064)
  • 1883  (825)
  • 1870  (548)
  • 1867  (407)
  • 1861  (414)
  • Chemistry  (42,697)
  • Cat
Source
Material
Years
  • 1995-1999
  • 1990-1994  (10,430)
  • 1985-1989  (18,430)
  • 1965-1969  (9,673)
  • 1940-1944
    • +
Year
Keywords
  • 1
    Electronic Resource
    Electronic Resource
    Postnatal development of central auditory frequency maps (1992)
    Springer
    Journal of comparative physiology 170 (1992), S. 129-143 
    Details
    ISSN: 1432-1351
    Keywords: Ontogeny ; Auditory system ; Tonotopy ; Chicken ; Rodent ; Cat ; Bat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary In the early postnatal period of many mammals and in the perihatching period of chicks the auditory ranges are restricted to the species-specific low- and mid-frequency ranges. During subsequent development, the high frequency hearing expands (depending on the species) by 1–4 octaves. Adult-like audition is established between the 4th and the 7th week. It is still discussed controversially, how the extension of the auditory ranges relates to the maturation of orderly frequency representation in the cochleae of the respective species. The present review summarizes investigations of the development of tonotopy in nuclei of the central auditory system, and discusses how the centrally acquired data might contribute to the understanding of the maturation of cochlear stimulus transduction and to the development of frequency maps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00196895
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Amegakaryocytic thrombocytopenia and immune-mediated haemolytic anaemia in a cat (1992)
    Springer
    Comparative clinical pathology 2 (1992), S. 175-178 
    Details
    ISSN: 1433-2981
    Keywords: Amegakaryocytic thrombocytopenia ; Cat ; Haemolytic anaemia ; Immune-mediated diseases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract An eleven-month-old female spayed domestic shorthair cat was presented for investigation of pruritic skin lesions and haemorrhage. Haematological evaluation revealed a markedly regenerative anaemia, neutrophilia with left shift, monocytosis, basophilia and severe thrombocytopenia. The direct antiglobulin test and serum antinuclear antibody tests were positive. Serologic and immunofluorescent antibody tests for feline leukaemia virus were negative. Bone marrow cytology revealed a lack of megakaryocytes with erythroid and myeloid hyperplasia. A peritoneopericardial diaphragmatic hernia was detected ultrasonographically, but was not considered to be related to the haematologic abnormalities. An immune-mediated aetiology for the amegakaryocytic thrombocytopenia was considered likely based on the concomitant positive direct antiglobulin and antinuclear antibody tests, but the cat responded poorly to short-term immunosuppressive therapy and was euthanized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00426174
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Morphology of a dicephalic cat (1992)
    Springer
    Anatomy and embryology 185 (1992), S. 45-55 
    Details
    ISSN: 1432-0568
    Keywords: Dicephalia ; Anterior duplications ; Congenital malformations ; Conjoined twins ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A detailed anatomical study of a dicephalic iniodymic monosomic cat in conjunction with the morphogenetical implications of the observed anomalies is presented. The animal exhibited two heads joined at the level of an anomalous medial exoccipital bone. Two brains and two foramina magna were present. The vertebral column was single but the cranial cervical vertebrae (C2 to C5) had doubled bodies. Cervical rachischisis with myeloschisis were associated defects. Two nasopharyngeal and oropharyngeal cavities converged caudally into a single laryngopharynx. The esophagus, larynx and trachea were single. Duplication of the tongue and hyoid apparatus was present. Palatoschisis affected both oral cavities. Hypoplasia of the anatomical structures in the medial aspects of both heads was observed. Microphthalmia was also observed in both medial eyes. Comparative aspects of the morphology, causative agents, and mechanisms and anomalous morphogenesis of anterior duplications are reviewed and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00213600
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Electromyographic studies of neck muscles in the intact cat (1992)
    Springer
    Experimental brain research 88 (1992), S. 59-66 
    Details
    ISSN: 1432-1106
    Keywords: Reflexes ; Electromyography ; Nuchal afferents ; Neck muscles ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Short-latency reflexes were studied in the neck muscles of four alert cats following electrical stimulation of nerves supplying biventer cervicis (BC), splenius (SP) or rectus capitis posterior (RCP). Reflexes were assessed by comparing levels of EMG activity of muscles before and after each stimulus, as the cats lapped milk, licked their paws or walked on a treadmill. When BC or SP nerves were stimulated at 1.5–4 times threshold (T) for their motor axons, no short-latency heteronymous reflexes could be identified in most neck muscles. However, stimulation of RCP nerves produced inhibitory effects as early as 3–4 ms in the ipsilateral BC, CM, and SP muscles and 6 ms in contralateral BC. At stimulus strengths above 4xT, a more complex pattern of inhibitory or excitatory effects was observed in CM, SP and the intervertebral muscle spinalis dorsi. The reflex effects were attenuated or abolished by partial or complete C1 dorsal rhizotomy (2 cats). Cervicocollic reflex data may need to be reevaluated to consider the possible effects of disinhibition rather than excitation in short-latency reflex pathways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259128
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Auditory cortex neurons sensitive to correlates of auditory motion: underlying mechanisms (1992)
    Springer
    Experimental brain research 88 (1992), S. 169-180 
    Details
    ISSN: 1432-1106
    Keywords: Auditory cortex ; Motion ; Depth ; Binaural interaction ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neuronal response properties such as phasic vs. tonic, onset vs. offset, monotonicity vs. non-monotonicity, and E/E vs. E/I, can be shown to act synergistically suggesting underlying mechanisms for selectivity to binaural intensity correlates of auditory sound source motion. Both identical (diotic), and oppositely directed dichotic AM ramps were used as stimuli in the lightly anesthetized cat, simulating motion in four canonical directions in 3-dimensional space. Motion in either azimuthal direction evokes selective activity in cells which respond best to the onset of monaural sound in one ear and show a decreased response to binaural stimulation (E/I or I/E). In some cells specificity is increased by “off” components in the non-dominant ear. Although these cells fire only at the onset of stationary sound, they fire throughout oppositely directed AM ramps. Motion toward or away from the head evokes responses from EE cells; strong binaural facilitation increases selectivity for motion in depth. The sharpness of direction of tuning was related to the degree of binaural facilitation in E/E cells. Selectivity for sound moving away from the head is correlated with “off” responses, while “on” responses correlate with preference for motion toward the head. Most units showed a monotonic rate function as AM ramp excursion and rate was increased. One third were selective for slower rates of intensity change and may therefore encode slower rates of stimulus motion, as well as direction of movement. The findings suggest that neural processing of auditory motion involves neural mechanisms distinct from those involved in processing stationary sound location and that these mechanisms arise from interactions between the more traditionally studied response properties of auditory cortex neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259138
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Simultaneous recording of lagged and nonlagged cells in the cat dorsal lateral geniculate nucleus (1992)
    Springer
    Experimental brain research 88 (1992), S. 229-232 
    Details
    ISSN: 1432-1106
    Keywords: Dorsal lateral geniculate nucleus ; Lagged cells ; Nonlagged cells ; Sensory processing ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary It has been suggested that lagged and nonlagged cells in the cat dorsal lateral geniculate nucleus (LGN) represent state-dependent response modes of the same class of LGN cells. In two separate experiments with single-unit recording in the LGN of anaesthetized and paralysed adult cats, a lagged and a nonlagged X-cell were recorded simultaneously with the same microelectrode. For each pair of cells, the amplitude of the action potentials was sufficiently different to allow separate compilation of peri-stimulus-time-histograms. For all 4 cells, the visual response pattern to a stationary flashing light spot was typical of their respective cell class. These findings support the hypothesis that lagged and nonlagged cells are separate cell classes and indicate that the population of LGN cells do not appear as lagged during one state of modulatory input and as nonlagged during another.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259147
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A novel member to the family of perineuronal antigens associated with subpopulatios of central neurons in the rat (1992)
    Springer
    Experimental brain research 88 (1992), S. 345-354 
    Details
    ISSN: 1432-1106
    Keywords: Neuronal subsets ; Pericellular antigen ; Monoclonal antibody ; Cat ; 301 ; VC1.1 ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We reported earlier that monoclonal antibodies (MAbs) 473 and 376 gave perineuronal staining of different subsets of central neurons, and that both immunoreactivities were labile to treatment with chondroitinase ABC. On the other hand, MAb 1B5, the immunoreactivity to which is uncovered by chondroitinase ABC, stained a neuronal subset that included neurons positive to MAbs 473 and 376 (Fujita et al. 1989). We now report a new antibody, MAb 374, that stained perimeter of neurons of a subset different from those stained by MAbs 473, 376 and 1B5. In the rat central nervous system MAb 374-positive cells were found in the neocortex, thalamic reticular nucleus, hippocampus, cerebellar cortex and nuclei, and in the brain stem. MAb 374-immunoreactive neuropil was found in the medial habenular, arcuate, dorsal endopiriform nuclei, and the two plexiform layers of the retina. The immunoreactivity was not affected by treatment with chondroitinase ABC. Immunoblot experiments using a rat brain homogenate revealed a specific band at a position corresponding to a molecular weight of 600 kD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Spread of synaptic activity along parallel fibres in cat cerebellar anterior lobe (1992)
    Springer
    Experimental brain research 88 (1992), S. 615-622 
    Details
    ISSN: 1432-1106
    Keywords: Cerebellar cortex ; Mossy fibre input ; Parallel fibres ; Field potentials ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Mossy fibre evoked activity in the cerebellar cortex elicited by peripheral electrical stimulation was studied in chloralose anesthetized cats. The distribution of intracortical field potentials in the C3 and D zones was mapped in order to determine if there is a spread of synaptic activity outside the mossy fibre termination area. This area was identified by the presence of short latency synaptic field potentials in the granular layer. 2. Molecular layer field potentials were recorded up to 1.5 mm outside the mossy fibre termination area. The latencies of these potentials increased with increasing distance from the mossy fibre termination area, corresponding to a conduction velocity of about 0.4 m/s. 3. Recordings from Purkinje cells, within and outside the mossy fibre termination area, revealed an increase of simple spike activity at latencies corresponding to those of the field potentials in the same location. 4. From the spatial and temporal characteristics of the evoked activity, it is concluded that a mossy fibre input results in spread of synaptic activity along the parallel fibres. 5. The findings are discussed in relation to the recently discovered microzonal organization of the C3 zone. It is proposed that the organization of this zone offers a possibility for the control of muscle synergies, each synergy being represented by a mossy fibre input and the specific set of microzones activated by this input via the parallel fibres.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228190
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Axonal trajectories of single Forel's field H neurones in the mesencephalon, pons and medulla oblongata in the cat (1992)
    Springer
    Experimental brain research 89 (1992), S. 484-495 
    Details
    ISSN: 1432-1106
    Keywords: Forel's field H ; Oculomotor nucleus ; Reticular formation ; Central tegmental tract ; Eye movements ; Neck movements ; Vertical ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We studied axonal trajectories of single Forel's field H (FFH) neurones (n= 19) in the mesencephalon, pons and medulla by systematic antidromic threshold mapping in cats and differentiated them into two major types. Type I neurones were characterized by projections to the oculomotor nucleus (IIIn) and type II neurones by lack of projections to the IIIn. 2. Type I neurones (11/19) were further classified into three subtypes by the lowest level of projections; type Ic (n = 3) which projected to the cervical cord and type Ib (n = 7) which terminated at the ponto-medullary level and type Ia (n = 1) at more rostral level. In the mesencephalon, stem axons passed just lateral to the IIIn and projected collaterals to the IIIn and the ventral part of the periaqueductal gray matter. In the lower brain stem, stem axons of type Ib and Ic neurones passed in the dorsal part of the reticular formation or in the medial longitudinal fasciculus and projected collaterals to the dorsal part of the nucleus reticularis pontis caudalis (NRPC) and the nucleus reticularis gigantocellularis (NRG) and the reticular formation underlying the nucleus prepositus hypoglossi (PH) and the raphe region. Projections to the superior colliculus were observed in two cases. 3. Type II neurones (8/19) were classified into 2 type IIb projecting to the ponto-medullary reticular formation and 6 type IIc projecting to the cervical spinal cord. In the mesencephalon, stem axons passed through a more lateral region than those of type I and projected collaterals to the mesencephalic reticular formation and the red nucleus. In the lower brain stem, the stem axons passed in the ventral part of the reticular formation corresponding to the central tegmental tract and projected collaterals to the ventral part of the NRPC and NRG. Projections to the interstitial nucleus of Cajal, the inferior olive and the reticular formation underlying the PH were also observed. 4. The dorsal and ventral location of, respectively, stem axons of type I and type II neurones in the lower brain stem was confirmed in a larger number of neurones in experiments with restricted mapping. 5. There was not much difference in location of cell bodies of type I (totally n = 50) and type II (n = 46) neurones. The proportion of spinal-projecting neurones were larger in type II (21/46, 46%) than in type I (7/50, 14%) neurones.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229872
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Binocular processing in the cat's dorsal lateral geniculate nucleus III. Spatial frequency, orientation, and direction sensitivity of nondominant-eye influences (1992)
    Springer
    Experimental brain research 89 (1992), S. 588-598 
    Details
    ISSN: 1432-1106
    Keywords: Lateral geniculate nucleus ; Vision ; Binocular ; Cortico-geniculate ; Orientation ; Sensitivity ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The present experiments examined the extent to which binocular processing in the cat's dorsal lateral geniculate nucleus (LGN) depends upon the spatial frequency, orientation, and direction of movement of stimuli presented to the nondominant eye. In Experiment 1, we tested the effects of varying these stimulus parameters on the responses of LGN cells to nondominant-eye stimulation. Sixteen of 34 cells tested had statistically significant responses to the nondominant eye and, in agreement with a previous study (Guido et al. 1989), the responsive cells were spatial-frequency sensitive. However, there was little evidence for orientation or direction sensitivity in responses to the nondominant eye: changes in discharge with changes in stimulus orientation and direction were small and were statistically significant in only nine of the cells. In Experiment 2, we tested the effects of varying spatial frequency, orientation, and direction of movement of stimuli presented to the nondominant eye on its ability to influence responses to the dominant eye (i.e., on binocular interactions). The dominant eye was stimulated with the optimal spatial frequency for the cell being tested. For 22 of 45 cells tested, nondominant-eye stimulation had a statistically significant effect on the response to the dominant eye. Fourteen of these cells showed band-pass spatial-frequency sensitivity in the nondominant-eye influence, and eight showed low-pass spatial-frequency sensitivity. However, only 11 of the cells had statistically significant variations in their binocular interactions that depended on the orientation or direction of stimuli presented to the nondominant eye. Furthermore, even for those cells, the effect of varying orientation and direction was only about half as strong as the effect of varying spatial frequency. We conclude that binocular processing in the LGN, including responses to the nondominant eye and nondominant-eye influences on responses to the dominant eye, are affected significantly by the spatial frequency of the nondominant-eye stimulus and relatively little by stimulus orientation or direction of movement. The significance of these findings for understanding the functions of LGN binocular processing is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229884
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 11
    Electronic Resource
    Electronic Resource
    Task-related differences in distribution of electromyographic activity within peroneus longus muscle of spontaneously moving cats (1992)
    Springer
    Experimental brain research 89 (1992), S. 682-685 
    Details
    ISSN: 1432-1106
    Keywords: EMG ; Hindlimb ; Kinesiology ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the hindlimb muscle peroneus longus (PerL) of cats, electromyographic activity (EMG) was recorded from anterior and posterior regions during voluntary motor behaviour. In spite of the fact that this muscle is composed of units that all exert their forces in the same direction, the intra-muscular EMG distribution differed in a marked and reproducible way between different types of motor behaviour. Anterior as well as posterior regions were both strongly active in relation to the swing-phase of stepping. In comparison to this stepping-activity, there was a marked predominance of posterior PerL activity during hindlimb standing (or take-off for a jump) and an equally pronounced predominance of anterior PerL activity when the cat was preparing to land from being lifted (or at the end of a jump). It is suggested that these task-associated differences in EMG distribution reflect topographical aspects of the intraspinal organization of motor tasks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229893
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 12
    Electronic Resource
    Electronic Resource
    Synaptic potentials produced in jaw-closer and jaw-opener motoneurons by palatal stimulation (1992)
    Springer
    Experimental brain research 90 (1992), S. 233-240 
    Details
    ISSN: 1432-1106
    Keywords: Postsynaptic potentials ; Trigeminal motoneurons ; Jaw movements ; Palatal stimulation ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Excitation and inhibition of temporal and digastric motoneurons (Temp. and Dig. Mns) during transient jaw closing, the so-called jaw-closing reflex, were studied in cats. Application of diffuse pressure stimulation to the posterior palatal surface produced the jaw-closing reflex and it was found that mechanosensory inputs from the posterior palatal mucosa produce depolarizing potentials on the Temp. Mns responsible for jaw closure during the jaw-closing reflex. We have demonstrated that in one-third of 27 explored Temp. Mns the initial bursts of spikes were elicited before the onset of jaw closure, suggesting that these cells contribute to initiate jaw closure during the jaw-closing reflex. The remaining cells probably contributed to maintain the occlusal phase. Furthermore, it was found that mechanosensory inputs from the posterior palatal mucosa produce a hyperpolarization-depolarization sequence in the Dig. Mns responsible for the jawclosing reflex. In addition, when pressure stimulation was applied to the anterior palatal mucosa, sustained jaw opening was elicited and an increase of firing frequency of Dig. Mns occurred 40 ms before the onset of jaw opening and continued for 80 ms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227234
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 13
    Electronic Resource
    Electronic Resource
    Patterns of projections from area 2 of the sensory cortex to area 3a and to the motor cortex in cats (1992)
    Springer
    Experimental brain research 91 (1992), S. 85-93 
    Details
    ISSN: 1432-1106
    Keywords: Sensorimotor ; Somatosensory cortex ; Connectivity ; Corticocortical ; Fluorescent tracer ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Peripheral information reaches the motor cortex partly through corticocortical pathways that arise from two functional subdivisions, area 2 and area 3a, of the sensory cortex. These sensory areas are synaptically linked with one another. The patterns of connectivity and the different submodality input that each area receives suggest that they send different efferent signals to the motor cortex. The projections from area 2 to area 3a and to the motor cortex were studied with retrogradely transported fluorescent tracers. The pattern and distribution of neuronal labeling in area 2 was determined following injections of different tracers into the forelimb regions of area 3a and the motor cortex. The results showed that the projections from area 2 to the two target regions were topographically and somatotopically related. Multiple clusters of motor cortex projection neurons were found in area 2, and these clusters overlapped extensively with clusters of area 3a projection neurons. Although cells labeled with one of the dyes were often in close proximity to cells labeled with the other dye, no double-labeled cells were found. Two different laminar patterns were seen for the two populations of neurons. The projection to area 3a originated from cells located in layers II–III and layers V–VI. The projection to the motor cortex originated from cells spread throughout layers II–IV, but predominately in layer III. Differences in laminar arrangement of the two populations of cells suggest a directional flow of information processing in the sensorimotor cortex. While sensory feedback is essential for the execution of skilled motor tasks, the flow of information processing and connectivity in the cortex is not well understood. The data presented here offer insight into some aspects of the mechanisms of sensorimotor integration.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230016
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 14
    Electronic Resource
    Electronic Resource
    A comparison of monaural and binaural responses to frequency modulated (FM) sweeps in cat primary auditory cortex (1992)
    Springer
    Experimental brain research 91 (1992), S. 435-454 
    Details
    ISSN: 1432-1106
    Keywords: Frequency modulated sweep ; Binaural response ; Primary auditory cortex ; Direction selectivity ; Speed selectivity ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Monaural and binaural single unit responses to frequency-modulated (FM) sweeps were compared in cat primary auditory cortex (AI). Both upward-directed (changing from low to high frequency) and downward-directed (changing from high to low frequency) FM sweeps were presented monaurally and binaurally at five rates of frequency modulation (referred to here as the speed of FM sweep). Two types of binaural FM sweep conditions were presented: (1) like-directed FM sweeps, in which identical FM sweeps were presented to both ears, and (2) opposite-directed FM sweeps, in which one ear was presented with one direction of FM sweep while the other ear was simultaneously presented with the opposite direction of FM sweep. In a sample of 78 cells, 33 cells were classified as EE (binaural facilitatory) and 45 were classified as EI (binaural inhibitory). Ninety-four percent of all units were sensitive to the direction and/or speed of FM sweeps. In general, under binaural stimulus conditions, EE cells responded optimally to like-directed FM sweeps, while EI cells preferred opposite-directed FM sweeps. When tested monaurally, 59% of all cells (both EE and EI) were direction selective, with the majority (76%) preferring downward-directed FM sweeps. When tested binaurally, most direction selective EE cells (60%) preferred upward-directed FM sweeps, while the majority of direction selective EI cells (71%) preferred downward-directed FM sweeps. Our analysis also allowed us to classify inhibitory responses of EI cells as either direction selective (37%) or non-direction selective (63%). For FM speed selectivity under monaural conditions, most EE cells preferred fast FM sweep rates (0.4–0.8 kHz/ms), while approximately equal numbers of EI cells preferred either slow (i.e., 0.05–0.1 kHz/ms) or fast (i.e., 0.4–0.8 kHz/ms) speeds. Under binaural conditions, the majority of EE and EI cells responded best to high speeds when tested with like-directed FM sweeps, while the preferred speed with opposite-directed FM sweeps was more broadly tuned. The results suggest the presence of binaural neural mechanisms underlying cortical FM sweep direction and speed selectivity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227840
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 15
    Electronic Resource
    Electronic Resource
    Longterm impairment of cat optokinetic nystagmus following visual cortical lesions (1992)
    Springer
    Experimental brain research 88 (1992), S. 594-608 
    Details
    ISSN: 1432-1106
    Keywords: Optokinetic reflex ; Vestibulo-ocular reflex ; Cortical lesion ; Areas 17, 18, 19 ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Binocular and monocular gain of optokinetic nystagmus (OKN), OKN dynamics, vestibulo-ocular reflex (VOR) and VOR adaptation were measured in 5 normal cats and in 5 cats which underwent bilateral visual cortical lesions involving the 17–18 complex at least 4 months before testing. We observed longterm deficits after bilateral lesions involving area 17 and variable parts of area 18 but failed to observe deficits after 18–19 lesions. These deficits were limited to the OKN gain and the build-up time constant of OKN; the VOR and the optokinetic after-nystagmus (OKAN) time constant were within normal limits. Our results suggest that areas 17–18 operate in parallel to control the encoding of retinal slip velocity at the level of the nucleus of the optic tract (NOT) and the accessory optic system (AOS), which are known to represent the initial stage of the optokinetic pathways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228188
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 16
    Electronic Resource
    Electronic Resource
    Transmission from group II muscle afferents is depressed by stimulation of locus coeruleus/subcoeruleus, Kölliker-Fuse and raphe nuclei in the cat (1992)
    Springer
    Experimental brain research 88 (1992), S. 502-516 
    Details
    ISSN: 1432-1106
    Keywords: Locus coeruleus ; Kölliker-Fuse ; Raphe nuclei ; Synaptic transmission ; Spindle afferents ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effects of brief trains of electrical stimuli applied within the locus coeruleus and subcoeruleus, the Kölliker-Fuse nucleus and the raphe magnus, obscurus and pallidus nuclei were tested on transmission from group I and group II muscle afferent fibres in mid-lumbar spinal segments of chloralose anaesthetized cats. Changes in the effectiveness of transmission from these afferents were assessed from changes in the size of monosynaptic extracellular field potentials evoked by them. The depression of group II field potentials occurred at conditioning-testing intervals of 20–400 ms, and was maximal at intervals of 40–100 ms and 30–60 ms for potentials recorded in the intermediate zone and dorsal horn, respectively. At intervals up to about 30 ms it was combined with the depression of group I components of the intermediate zone field potentials. However, at longer intervals the conditioning stimuli depressed group II components of these potentials as selectively as monoamines applied ionophoretically at the recording site (Bras et al., 1989a, 1990). Thus, only the late depressive actions are considered as being possibly mediated by impulses in descending noradrenergic and/or serotonergic fibres. No major differences were found in the relative degree of depression of transmission from group II afferents by stimulation of the locus coeruleus/subcoeruleus, Kölliker-Fuse or raphe nuclei, either in the dorsal horn or in the intermediate zone. Since field potentials at these locations are preferentially depressed by ionophoretic application of serotonin and noradrenaline (Bras et al., 1990), and since the locus coeruleus/subcoeruleus, Kölliker-Fuse and raphe nuclei are interconnected, the study leads to the conclusion that both noradrenergic and serotonergic descending pathways can be activated by stimuli applied within either of them. Selective depression of field potentials of group II origin was also evoked by stimulation at other sites, e.g. the periaqueductal grey and medullary reticular formation, when conditioning-testing intervals were sufficiently long. Such a depression is considered to be secondary to activation of neurones of the locus coeruleus/subcoeruleus, Kölliker-Fuse or raphe nuclei and attributed to the spread of current or transsynaptic activation of these neurones, or to stimulation of their axon collaterals outside the nuclei rather than to other descending medullo-spinal systems. The non-selective depression of field potentials evoked by group I and group II afferents at shorter conditioning-testing intervals is proposed to be due to actions of reticulo-spinal pathways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228180
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 17
    Electronic Resource
    Electronic Resource
    Dorsal column input to thalamic VL neurons: an intracellular study in the cat (1992)
    Springer
    Experimental brain research 88 (1992), S. 551-559 
    Details
    ISSN: 1432-1106
    Keywords: Thalamus ; Motor cortex ; Dorsal column nuclei ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary This study investigated the role of the ventral lateral (VL) nucleus of the thalamus as a lemniscal relay to motor cortex. Intracellular recordings were obtained from thalamic VL relay neurons in cats anesthetized with chloralose, following stimulation of the dorsal column nuclei. VL neurons were identified by their short-latency input from the cerebellar nuclei, their antidromic activation from motor cortex and their anatomical location. A total of 105 neurons was studied. The occurence of temporal facilitation to double volleys was also examined. It was found that 80/105 (75%) neurons responded with excitation and/or inhibition to stimulation of the dorsal column nuclei. The latencies of the postsynaptic responses ranged from 2.0 to 20 ms (median 10.0 ms). The latencies of nearly all responses (79/80) were 〉 3 ms and nearly all responses (45/47) which were tested for it, displayed temporal facilitation to double shock stimulation, consistent with polysynaptic transmission. Effective stimulation sites were found in the gracile and cuneate nuclei. Recording sites were located throughout VL, including the “border region” with the ventral posterior lateral nucleus (VPL). There was no obvious topographic relationship between location of recording site and latency or polarity (excitation versus inhibition) of the synaptic responses. This is consistent with dorsal column input diffusely distributed over VL. When the recording electrodes penetrated VPL, characteristics of the EPSPs were indicative of monosynaptic transmission (short latency, no temporal facilitation). This clear transition from VL to VPL suggests that it is not necessary to define, on physiological grounds, a separate “border region” between these two nuclei. The data provide evidence that dorsal column information reaches VL neurons polysynaptically, not monosynaptically. This indicates that VL is part of a long-latency, not short-latency path through the dorsal column nuclei to motor cortex.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228184
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 18
    Electronic Resource
    Electronic Resource
    Mono- and disynaptic pathways from Forel's field H to dorsal neck motoneurones in the cat (1992)
    Springer
    Experimental brain research 88 (1992), S. 580-593 
    Details
    ISSN: 1432-1106
    Keywords: Forel's field H ; Reticular formation ; Reticulospinal neurones ; Neck motoneurones ; Head movements ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. We analysed the synaptic actions produced by Forel's field H (FFH) neurones on dorsal neck motoneurones and the pathways mediating the effects. 2. Stimulation of ipsilateral FFH induced negative field potentials of several hundred microvolts with the latency of about 1.1 ms in the medial ponto-medullary reticular formation, being largest in the ventral part of the nucleus reticularis pontis caudalis (NRPC), and in the dorsal part of the nucleus reticularis gigantocellularis (NRG). 3. Stimulation of ipsilateral FFH induced excitatory postsynaptic potentials (EPSPs) in 90% (47/52) and inhibitory postsynaptic potentials (IPSPs) in 19% (10/52) of the reticulospinal neurones (RSNs) in the NRPC and the NRG. Latencies of the EPSPs and IPSPs were 0.7–3.0 ms, the majority of which were in the monosynaptic range. The monosynaptic connexions were confirmed by spike triggered averarging technique both in excitatory (n=4) and inhibitory (n=2) pathways. 4. Single stimulation of FFH induced EPSPs at the segmental latencies of 0.3–1.0 ms in neck motoneurones, which were clearly in the monosynaptic range. Repetitive stimulation of FFH produced marked temporal facilitation of EPSPs in neck motoneurones. The facilitated components of the EPSPs had a little longer latencies and their amplitude reached several times as large as that evoked by single stimulation in all the tested motoneurones. These facilitated excitations are assumed to be mediated by RSNs in the NRPC and NRG, since RSNs were mono- and polysynaptically fired by stimulation of FFH and they were previously shown to directly project to neck moteneurones. 5. EPSPs were induced in 91% (82/91) of motoneurones supplying m. biventer cervicis and complexus (BCC; head elevator), 10% (3/29) of motoneurones supplying m. splenius (SPL; lateral head flexor). Eikewise, stimulation of FFH produced EMG responses in BCC muscles, while not in SPL muscle. Thus FFH neurones produce excitations preferentially in BCC motoneurones. 6. Systematic tracking in and around FFH revealed that the effective sites for evoking above effects were in FFH and extended caudally along their efferent axonal course. 7. These results suggested that FFH neurones connect with neck motoneurones (chiefly BCC, head elevator) mono-, diand/or polysynaptically and are mainly concerned with the control of vertical head movements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228187
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 19
    Electronic Resource
    Electronic Resource
    Short latency cutaneous reflex responses of γ-efferents in the decerebrate cat (1992)
    Springer
    Experimental brain research 89 (1992), S. 140-146 
    Details
    ISSN: 1432-1106
    Keywords: Fusimotor neurones ; Muscle spindles ; Spinal reflexes ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The effect of single shock stimulation, up to 20 × threshold (T), of the sural nerve on the discharges of triceps surae γ-efferents was investigated in decerebrate cats. Units were classified as static (12) or dynamic (7) on the basis of their resting discharge rates (Murphy et al. 1984). All neurones were excited at short latency by sural nerve stimulation and response size was graded with stimulus intensity. Short latency mixed or inhibitory responses were not evident. Although reflex effects first occurred at low stimulus strengths (〈-1.5T) in both types of efferent, most responses appeared at higher intensities (〉 1.5T). The estimated central delays of the responses of static (3.0 ±1.1 ms, mean± SD) and dynamic (3.4 ± 1.0 ms) γ-motoneurones were not significantly different and are consistent with spinal oligosynaptic pathways. The present results differ from those of the only previous study (Johansson and Sojka 1985) of the short latency responses of triceps surae static and dynamic γ-motoneurones to sural nerve stimulation, in which mixed and inhibitory effects were common in anaesthetised cats. Although differences in recording techniques and γ sampling may account for the apparent disparity between these studies, it is also feasible that a difference in the setting of interneuronal pathways in the two types of preparation is responsible. The results are discussed in relation to the control of γ-motoneurones with particular reference to the “final common input” hypothesis (Johansson 1981; Appelberg et al. 1983).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229011
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 20
    Electronic Resource
    Electronic Resource
    Vocalizations in the cat: behavioral methodology and spectrographic analysis (1992)
    Springer
    Experimental brain research 89 (1992), S. 333-340 
    Details
    ISSN: 1432-1106
    Keywords: Animal model ; Vocalization ; Spectrograms ; Instrumental conditioning ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Attempts to understand the neural mechanisms underlying mammalian vocal behaviors, including speech, require study of the neural activity and anatomy of vocalization-controlling brain structures. Such studies necessitate the application of invasive neurobiological techniques in animal models. In the current study, cats are used in the development of an animal model of vocal tract control. The animals are instrumentally conditioned to vocalize for food reward. Acquisition of this task can occur within a few minutes, although additional training generally is required to solidly establish the behavior and to train subjects to produce consistently high rates of vocalization for prolonged periods of time. Following training, animals can generally sustain a rate of two calls per minute for a period of over two hours. Optimal task performance is partly dependent on motivation level. Although there is considerable variation between animals, the vocalizations produced have an average duration of 600 ms and a fundamental frequency of around 500 Hz. In addition, during a typical vocalization, there are dynamic variations of about 150 Hz for fundamental frequency and 17 dB for sound intensity. These variations provide opportunities for relating neural and muscular activity to different aspects of the vocal behavior they control. Based on a number of considerations, the model and techniques discussed here probably are most applicable to studying the neurobiology of sub-cortical nuclei subserving vocal control. Similar mechanisms might well be present in other species, including humans. Thus, data obtained from study of this model may be applicable to understanding the processes underlying vocal tract control during human speech.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228249
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 21
    Electronic Resource
    Electronic Resource
    Somatotopic termination of the spino-olivary fibers in the cat, studied with the wheat germ agglutinin-horseradish peroxidase technique (1992)
    Springer
    Experimental brain research 89 (1992), S. 397-407 
    Details
    ISSN: 1432-1106
    Keywords: Spinal cord ; Inferior olivary nucleus ; Somatotopy ; Wheat germ agglutinin horseradish peroxidase ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Terminal sites of the spino-olivary fibers (SOFs) were examined by the anterograde transport of wheat germ agglutinin-horseradish peroxidase in the cat. The tracer was injected at various spinal cord levels from the first cervical to the caudal segments. The SOFs derived from the C1-T1 segments terminated medially in the caudal half (levels II–VIII of Brodal) of the medial accessory olive (MAO), which projects to the A zone of the cerebellar cortex, whereas the SOFs derived from the L6-S1 segments terminated laterally in the caudal half (levels I–VIII) of the MAO. No projections were found from the T2-L5 segments to the MAO. In the dorsal accessory olive (DAO), the SOFs terminated at levels III–XIV; the DAO projects to the B zone and the C1 and C3 zones of the cerebellar cortex. The SOFs derived from the C1-C4 segments terminated in the most medial part of the DAO (levels III–XIV), followed laterally by those from the C5-T1 segments. Further laterally, the SOFs derived from the T2-L5 and the L6-S1 segments terminated in the mediolateral order at levels V–XIV. The SOFs from the L6-S1 segments occupied the most lateral part of the DAO. The present study demonstrates that there is a distinct somatotopic termination of the SOFs in the mediolateral order in the caudal MAO and the DAO.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228255
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 22
    Electronic Resource
    Electronic Resource
    The bulbar network of respiratory neurons during apneusis induced by a blockade of NMDA receptors (1992)
    Springer
    Experimental brain research 89 (1992), S. 623-639 
    Details
    ISSN: 1432-1106
    Keywords: Respiratory neurons ; Apneusis ; Rhythmogenesis ; Excitatory amino acid ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Our aim was to study the mechanisms producing the transition from the inspiratory phase to the expiratory phase of the breathing cycle. For this purpose we observed the changes affecting the discharge patterns and excitabilities of the different types of respiratory neurons within the respiratory network in cat medulla, after inducing an apneustic respiration with the N-methyl-D-aspartate (NMDA) antagonist MK-801 given systemically. Respiratory neurons were recorded extracellularly through the central barrel of multibarrelled electrodes, in the ventral respiratory area of pentobarbital-anesthetized, vagotomized, paralyzed and ventilated cats. Inhibitions exerted on each neuron by the presynaptic pools of respiratory neurons were revealed when the neuron was depolarized by an iontophoretic application of the excitatory amino-acid analogue quisqualate. Cycle-triggered time histograms of the spontaneous and quisqualate-increased discharge of respiratory neurons were constructed in eupnea and in apneusis induced with MK-801. During apneustic breathing, the activity of the respiratory neuronal network changed throughout the entire respiratory cycle including the post-inspiratory phase, and the peak discharge rates of all types of respiratory neurons, except the late-expiratory type, decreased. During apneusis, the activity of the post-inspiratory neuronal pool, the post-inspiratory depression of other respiratory neurons, and the phrenic nerve after-discharge were reduced (but not totally suppressed), whereas the discharge of some post-inspiratory neurons shifted into the apneustic plateau. The shortened post-inspiration (stage 1 of expiration) altered the organization of the expiratory phase. Late-expiratory neurons (stage 2 of expiration) discharged earlier in expiration and their discharge rate increased. The inspiratory on-switching was functionally unaffected. Early inspiratory neurons of the decrementing type retained a decrementing pattern followed by a reduced discharge rate in the apneustic plateau, whereas early-inspiratory neurons of the constant type maintained a high discharge rate throughout the apneustic plateau. Inspiratory augmenting neurons, late-inspiratory and “offswitch” neurons also discharged throughout the apneustic plateau. During the apneustic plateau, the level of activity was constant in the phrenic nerve and in inspiratory neurons of the early-constant, augmenting, and late types. However, progressive changes in the activity of other neuronal types demonstrated the evolving state of the respiratory network in the plateau phase. There was a slowed but continued decrease of the activity of early-inspiratory decrementing neurons, accompanied by an increasing activity and/or excitability of “off-switch”, postinspiratory and late-expiratory neurons. In apneusis there was a decoupling of the duration of inspiration and expiration. The variability of inspiratory duration increased five-fold whereas the variability of expiration was unchanged. We conclude that in the apneustic state, (1) inspiratory on-switching and the successive activation of the different inspiratory neuronal types are preserved; (2) near the end of the inspiratory ramp, the reversible phase of inspiratory off-switching is prolonged, producing the apneustic plateau, and (3) the irreversible phase of offswitching is impaired by a reduced activity of postinspiratory neurons. These results support the 3-phase model of respiratory rhythm generation, in which key roles are played by early-inspiratory and post-inspiratory neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229887
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 23
    Electronic Resource
    Electronic Resource
    Sprouting of fusimotor neurones after partial denervation of the cat soleus muscle (1992)
    Springer
    Experimental brain research 90 (1992), S. 369-374 
    Details
    ISSN: 1432-1106
    Keywords: Muscle spindle ; Fusimotor ; Extrafusal ; Motor unit ; Contraction ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Normally, γ motoneurones innervate only the intrafusal fibres of muscle spindles. This is a report of sprouting of γ motoneurones to innervate extrafusal muscle fibres following partial denervation of the soleus muscle of kittens. In eight newborn animals, the L7 ventral root was cut on one side under anaesthesia and the animals were then allowed to recover. At approximately 100 days of age animals were reanaesthetised and a study made of mechanical properties of motor units whose axons ran in the S1 ventral root and supplied the partially denervated soleus muscle. Evidence was obtained for sprouting of all surviving α motoneurones. In addition, in four experiments axons conducting within the γ range, on stimulation, produced measurable tension. In one experiment, stimulation of one such γ axon also produced specific fusimotor effects on four afferents identified as coming from primary endings of muscle spindles. The γ axon was therefore a fusimotor axon. The effect observed on stimulation of the γ axon suggested a largely dynamic action. Other examples of γ axons were encountered that on stimulation produced tension, but which could not be specifically associated with spindles. In addition, a number of γ axons that did not develop tension were shown, on stimulation, to have fusimotor effects that were static in action. It is concluded that in extensively denervated muscles γ motoneurones may sometimes sprout to innervate extrafusal fibres. The mechanical properties of the extrafusal fibres innervated by such γ axons were similar to those of ordinary α motor units.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227250
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 24
    Electronic Resource
    Electronic Resource
    On the regulation of repetitive firing in lumbar motoneurones during fictive locomotion in the cat (1992)
    Springer
    Experimental brain research 90 (1992), S. 441-455 
    Details
    ISSN: 1432-1106
    Keywords: Afterhyperpolarisation ; Motoneurone ; Fictive locomotion ; Repetitive firing ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Repetitive firing of motoneurones was examined in decerebrate, unanaesthetised, paralysed cats in which fictive locomotion was induced by stimulation of the mesencephalic locomotor region. Repetitive firing produced by sustained intracellular current injection was compared with repetitive firing observed during fictive locomotion in 17 motoneurones. During similar interspike intervals, the afterhyperpolarisations (AHPs) during fictive locomotion were decreased in amplitude compared to the AHPs following action potentials produced by sustained depolarising current injections. Action potentials were evoked in 10 motoneurones by the injection of short duration pulses of depolarising current throughout the step cycles. When compared to the AHPs evoked at rest, the AHPs during fictive locomotion were reduced in amplitude at similar membrane potentials. The post-spike trajectories were also compared in different phases of the step cycle. The AHPs following these spikes were reduced in amplitude particularly in the depolarised phases of the step cycles. The frequency-current (f-I) relations of 7 motoneurones were examined in the presence and absence of fictive locomotion. Primary ranges of firing were observed in all cells in the absence of fictive locomotion. In most cells (6/7), however, there was no relation between the amount of current injected and the frequency of repetitive firing during fictive locomotion. In one cell, there was a large increase in the slope of the f-I relation. It is suggested that this increase in slope resulted from a reduction in the AHP conductance; furthermore, the usual elimination of the relation is consistent with the suggestions that the repetitive firing in motoneurones during fictive locomotion is not produced by somatic depolarisation alone, and that motoneurones do not behave as simple input-output devices during this behaviour. The correlation of firing level with increasing firing frequency which has previously been demonstrated during repetitive firing produced by afferent stimulation or by somatic current injection is not present during fictive locomotion. This lends further support to the suggestion that motoneurone repetitive firing during fictive locomotion is not produced or regulated by somatic depolarisation. It is suggested that although motoneurones possess the intrinsic ability to fire repetitively in response to somatic depolarisation, the nervous system need not rely on this ability in order to produce repetitive firing during motor acts. This capability to modify or bypass specific motoneuronal properties may lend the nervous system a high degree of control over its motor output.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230927
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 25
    Electronic Resource
    Electronic Resource
    Differential action of (−)-baclofen on the primary afferent depolarization produced by segmental and descending inputs (1992)
    Springer
    Experimental brain research 91 (1992), S. 29-45 
    Details
    ISSN: 1432-1106
    Keywords: Presynaptic inhibition ; Primary afferent depolarization ; Baclofen ; GABA ; Spinal cord ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The purpose of the present series of experiments was to analyze, in anesthetized and paralyzed cats, the effects of (-)-baclofen and picrotoxin on the primary afferent depolarization (PAD) generated in single Ib afferent fibers by either intraspinal microstimulation or stimulation of the segmental and descending pathways. PAD was estimated by recording dorsal root potentials and by measuring the changes in the intraspinal activation threshold of single Ib muscle afferent fibers. The PAD elicited by stimulation of group I muscle or cutaneous afferents was readily depressed and often abolished 20–40 min after the intravenous injection of 1–2 mg/kg (-)-baclofen. In contrast, the same amounts of (-)-baclofen produced a relatively small depression of the PAD elicited by stimulation of the brainstem reticular formation (RF). The monosynaptic PAD produced in single Ib fibers by intraspinal microstimulation within the intermediate nucleus was depressed and sometimes abolished following the i.v. injections of 1–2 mg/kg (-)-baclofen. Twenty to forty minutes after the i.v. injection of picrotoxin (0.5–1 mg/kg), there was a strong depression of the PAD elicited by stimulation of muscle and cutaneous afferents as well as of the PAD produced by stimulation of the RF and the PAD produced by intraspinal microstimulation. The results obtained suggest that, in addition to its action on primary afferents, (-)-baclofen may depress impulse activity and/or transmitter release in a population of last-order GABAergic interneurons that mediate the PAD of Ib fibers. The existence of GABAb autoreceptors in last-order interneurons mediating the PAD may function as a self-limiting mechanism controlling the synaptic efficacy of these interneurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230011
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 26
    Electronic Resource
    Electronic Resource
    Peculiarities of inhibition in cat auditory cortex neurons evoked by tonal stimuli of various durations (1992)
    Springer
    Experimental brain research 91 (1992), S. 115-120 
    Details
    ISSN: 1432-1106
    Keywords: Auditory cortex ; Tone ; Inhibition ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The extra- and intracellular responses of 262 neurons in A1 to tones of best frequency with durations ranging from 10 ms to 1.2 min were studied acute experiments on ketamine-anesthetized cats. Following the generation of action potentials in response to the tone stimulus, inhibition of both the background and the auditory stimulus-evoked spike activity were observed in 91% of the investigated neurons. The duration of this inhibition corresponded to the stimulus duration. For the remaining neurons (9%) an inhibition of the stimulus-evoked spike activity alone was seen, also corresponding to the stimulus duration. Maximal inhibition of the spike activity occurred for the first 100–200 ms of the inhibitory response (the period which equalled the time of development of an IPSP in a cell). During this period of IPSP development, the membrane resistance of the neuron was reduced to 60–90% of its initial value. Varying the duration of the acoustic signal within a range of 10–200 ms was accompanied by a change in the IPSP duration and inhibition of the spike acitivity of the neuron. Whenever the tone lasted more than 200 ms, the membrane potential of the neuron was restored to the resting potential. However, during this period, the responsiveness of the neuron was lower than that initially observed. Measurement of the membrane resistance during the inhibitory pause that was not accompanied by hyperpolarization produced an index with an average 17% lower than the initial value for 87% of the neurons. The data indicate that inhibition of the spike activity in Al neurons evoked by tone stimuli of various durations is due to the appearance of postsynaptic inhibition on their membrane. It is concluded that the time course of the cortical inhibitory input to neurons is the major factor determining variations in duration of the inhibition of response of auditory cortex neurons to an auditory stimulus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230019
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 27
    Electronic Resource
    Electronic Resource
    Differences between steady-state and transient post-synaptic potentials elicited by stimulation of the sural nerve (1992)
    Springer
    Experimental brain research 91 (1992), S. 167-170 
    Details
    ISSN: 1432-1106
    Keywords: Motoneurons ; Post-synaptic potential ; Sural nerve ; Recruitment ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In cat medial gastrocnemius motoneurons, single stimuli to the cutaneous sural nerve evoke a post-synaptic potential with a mixture of depolarization and hyperpolarization, depolarization being dominant in type F cells and hyperpolarization in type S cells. This pattern is consistent with previous reports showing that activation of the sural nerve can sometimes reverse the normal order of motor unit recruitment by inhibiting S motor units while simultaneously exciting F motor units. However, during repetitive stimulation for 1–2 s, we found that the hyperpolarizing component of the sural input to medial gastrocnemius motoneurons was not persistent, but instead gave way to depolarization after the first 30 ms. The net steady-state response after 0.5–1.0 s of stimulation was depolarization in all cells, regardless of motor unit type. This suggests that tonic sural input may be incapable of producing prolonged recruitment reversals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230025
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 28
    Electronic Resource
    Electronic Resource
    Pretectal jerk neuron activity during saccadic eye movements and visual stimulations in the cat (1992)
    Springer
    Experimental brain research 91 (1992), S. 273-283 
    Details
    ISSN: 1432-1106
    Keywords: Pretectum ; Jerk neurons ; Saccades ; Visual stimuli ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The activity of ‘jerk neurons’ was recorded extracellularly in the pretectum of the awake cat. The characteristic response of jerk neurons was a short, high-frequency burst that occurred after fast movements (‘jerks’) of a large, structured visual stimulus, during saccadic eye movements in the light, and after ‘on’ or ‘off’ visual stimulation. Mean burst latency to pure visual ‘jerks’ was 50 ms, whereas it was 30 ms to saccadic eye movements. Bursts were found to be stereotyped; the highest discharge rate was always at burst onset. Jerk neurons were not selective for stimulus parameters (such as movement amplitude or direction) except that in some neurons a weak correlation between stimulus velocity and discharge frequency was found. During saccades in the dark, clear bursts were only rarely found. In about half of the neurons, however, there was a slight but significant increase in the number of spikes above spontaneous frequency. Visual receptive fields were very large (46° horizontal and 35° vertical extent, on average). Nevertheless, the pretectal jerk neurons showed a rough retinotopic order, which was in accordance with the published retinotopy of the pretectum. Jerk neurons were found throughout the whole superficial pretectum, but preferentially in an area that corresponds to the nucleus of the optic tract (NOT) and the nucleus pretectalis posterior (NPP). Saccades were elicited by electrical stimulations at the sites where jerk neurons were recorded. The direction of the elicited saccades depended strongly on the pretectal stimulation site. A possible role of the jerk neurons as a visuomotor relay to elicit saccades or to modulate perception and attention is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231660
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 29
    Electronic Resource
    Electronic Resource
    Expression of GAP-43 mRNA in the adult mammalian spinal cord under normal conditions and after different types of lesions, with special reference to motoneurons (1992)
    Springer
    Experimental brain research 91 (1992), S. 284-295 
    Details
    ISSN: 1432-1106
    Keywords: GAP-43 ; In situ hybridization ; Spinal cord ; Axotomy ; Rat ; Cat ; Monkey
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In situ hybridization histochemistry was used to detect cell bodies expressing mRNA encoding for the phosphoprotein GAP-43 in the lumbosacral spinal cord of the adult rat, cat and monkey under normal conditions and, in the cat and rat, also after different types of lesions. In the normal spinal cord, a large number of neurons throughout the spinal cord gray matter were found to express GAP-43 mRNA. All neurons, both large and small, in the motor nucleus (Rexed's lamina IX) appeared labeled, indicating that both alpha and gamma motoneurons express GAP-43 mRNA under normal conditions. After axotomy by an incision in the ventral funiculus or a transection of ventral roots or peripheral nerves, GAP-43 mRNA was clearly upregulated in axotomized motoneurons, including both alpha and gamma motoneurons. An increase in GAP-43 mRNA expression was already detectable 24 h postoperatively in lumbar motoneurons both after a transection of the sciatic nerve at knee level and after a transection of ventral roots. At this time, a stronger response was seen in the motoneurons which had been subjected to the distal sciatic nerve transection than was apparent for the more proximal ventral root lesion. An upregulation of GAP-43 mRNA could also be found in intact motoneurons located on the side contralateral to the lesion, but only after a peripheral nerve transection, indicating that the concomitant influence of dorsal root afferents may play a role in GAP-43 mRNA regulation. However, a dorsal root transection alone did not seem to have any detectable influence on the expression of GAP-43 mRNA in spinal motoneurons, while the neurons located in the superficial laminae of the dorsal horn responded with an upregulation of GAP-43 mRNA. The presence of high levels of GAP-43 in neurons has been correlated with periods of axonal growth during both development and regeneration. The role for GAP-43 in neurons under normal conditions is not clear, but it may be linked with events underlying remodelling of synaptic relationships or transmitter release. Our findings provide an anatomical substrate to support such a hypothesis in the normal spinal cord, and indicate a potential role for GAP-43 in axon regeneration of the motoneurons, since GAP-43 mRNA levels was strongly upregulated following both peripheral axotomy and axotomy within the spinal cord. The upregulation of GAP-43 mRNA found in contralateral, presumably uninjured motoneurons after peripheral nerve transection, as well as in dorsal horn neurons after a dorsal root transection, indicates that GAP-43 levels are altered not only as a direct consequence of a lesion, but also after changes in the synaptic input to the neurons.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231661
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 30
    Electronic Resource
    Electronic Resource
    Decreasing the cortical response to monocular deprivation need not decrease cell shrinkage in cat lateral geniculate nucleus (1992)
    Springer
    Experimental brain research 92 (1992), S. 79-84 
    Details
    ISSN: 1432-1106
    Keywords: Visual cortex ; Norepinephrine ; Acetylcholine ; Critical and sensitive periods ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Monocular deprivation (MD) of young kittens decreases the response of visual cortex cells to the deprived eye. In addition, it causes cell shrinkage in the layers of the lateral geniculate nucleus (LGN) innervated by the deprived eye. To determine whether the shrinkage of LGN cells is dependent upon changes in the response of cortical cells, we compared LGN cell shrinkage in three groups of MD animals. Two were controls; the third received lesions of fibers bringing norepinephrine and acetylcholine to the visual cortex. This procedure greatly attenuated the effect of MD on the visual cortex. The amount of LGN cell shrinkage did not differ among the three groups. We conclude that LGN shrinkage after MD does not require a dramatic loss of cortical cell responses to the deprived eye.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230385
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 31
    Electronic Resource
    Electronic Resource
    Functional topography of cat primary auditory cortex: representation of tone intensity (1992)
    Springer
    Experimental brain research 92 (1992), S. 105-122 
    Details
    ISSN: 1432-1106
    Keywords: Primary auditory cortex ; Intensity ; Isofrequency domain ; Topography ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The neuronal response to tones as a function of intensity was topographically studied with multiple-unit recordings in the primary auditory cortex (AI) of barbiturate-anesthetized cats. The spatial distribution of the characteristics of rate/level functions was determined in each of three intensely studied cases and their relationship to the distribution of spectral parameters (sharpness of tuning and responses to broadband transients) in the same animals was determined. The growth of the high-intensity portion of rate/level functions was estimated by linear regression. Locations with monotonically growing high-intensity portions were spatially segregated from locations with nonmonotonic rate/level functions. Two noncontiguous areas with a high degree of non-monotonicity were observed. One was located at the dorsoventral center of AI, and a second in the dorsal third of AI. The more ventral aggregate of high non-monotonicity coincided with the region of sharp frequency tuning. The stimulus levels that produced the highest firing rate (strongest response level, SRL) at any sampled location ranged from 10 to 80 dB sound pressure level (SPL). Several spatial aggregates with either high or low SRLs were observed in AI. The region of sharpest tuning was always associated with a region of low SRLs. The response threshold to contralateral tones at the characteristic frequency (CF) ranged from — 10 dB SPL to 85 dB SPL with the majority between 0 and 40 dB SPL. The spatial distribution of response thresholds indicated several segregated areas containing clusters with either higher or lower response thresholds. The correlation of response threshold with integrated bandwidth and transient responses was only weak. Low- and high-intensity tones of the same frequency are represented at different locations in AI as judged by the amount of evoked neuronal activity and are largely independent of the frequency organization. The spatial distribution of locations with high monotonicity and low strongest response levels were aligned with the organization of the integrated excitatory bandwidth and covaried with the response strength to broadband stimuli.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00230388
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 32
    Electronic Resource
    Electronic Resource
    Responses of cat ventroposterolateral thalamic neurons to vibrotactile stimulation of forelimb footpads (1992)
    Springer
    Experimental brain research 92 (1992), S. 286-298 
    Details
    ISSN: 1432-1106
    Keywords: Somatosensory thalamus ; Vibrotactile sensation ; Tactile neurons ; Vibration coding ; Glabrous skin ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Responses of neurons in the ventroposterolateral nucleus of the thalamus to vibration applied to the forelimb footpads were analyzed in anesthetized cats in order to describe the signalling properties of thalamic neurons that received input from the different classes of tactile afferents innervating the glabrous skin of the distal forelimb. Seventy-six thalamic neurons, the majority of which (60 of 76) were positively identified as thalamocortical projection neurons, were classified into two broad groups according to their responses to 1-s step indentations of the skin. A minority (24%) comprised neurons that had slowly adapting (SA) responses, whereas the remainder (76%), the dynamically sensitive neurons, had transient responses to the onset and offset phase of the step and were further classified according to their sensitivity to cutaneous vibrotactile stimuli into those activated by low-frequency vibration (rapidly adapting, RA, neurons) and those activated by high frequencies (Pacinian afferent, PC, neurons). Thalamic RA neurons displayed phaselocked responses to vibration at frequencies up to ∼100 Hz, while PC neurons displayed phaselocked responses to vibration up to 400–500 Hz. Thalamic SA neurons varied in their responses to vibrotactile stimuli; half were most sensitive to vibration frquencies of 50 Hz or less, while the others responded over a broader range of frequencies. Although three major classes of footpad-related thalamic neurons were identified, there was evidence of convergent input to a small proportion of them. The study demonstrates that thalamic neurons have the capacity for responding to cutaneous vibration with phaselocked, patterned impulse trains, which would enable them to encode information about vibrotactile frequencies up to ∼ 300 Hz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227971
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 33
    Electronic Resource
    Electronic Resource
    Electromyographic studies of neck muscles in the intact cat (1992)
    Springer
    Experimental brain research 88 (1992), S. 41-58 
    Details
    ISSN: 1432-1106
    Keywords: Head movement ; Electromyography ; Muscle activity ; Cervical vertebrae ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Natural head movements in alert, unrestrained cats were studied using video-filming, videofluoroscopy and electromyographic (EMG) recording methods. In each cat, up to sixteen neck muscles or neck-muscle compartments were implanted with recording electrodes. Patterns of muscle recruitment were examined during systematically-selected behavioral epochs in which the cat held a range of stationary postures, and when it performed volitional and exploratory behaviors such as flexion-extension or turning, grooming, eating, or headshaking. Patterns of muscular activity were interpreted with reference to simultaneous video images of head and neck movements. In separate, videofluoroscopic analysis, flexion-extension movements were examined to gain insight into the underlying movements of the skull and cervical vertebrae. These and other movements were found commonly to depend upon changes in joint angles between lower as well as upper cervical joints. Stationary postures in which the neck was held vertically were consistently associated with tonic EMG activity in only two long dorsal muscles, biventer cervicis and occipitoscapularis. Less consistent activity was also present in dorsal intervertebral muscles crossing lower cervical joints. When the neck was held horizontally, the long dorsal muscles increased their EMG activity and moderate activity was also recorded in deeper intervertebral and suboccipital muscles. When flexion-extension occurred around upper cervical joints, greatest activity was recorded in rectus capitis posterior and complexus, but when it involved the lower cervical joints, large changes in EMG activity could also be detected in biventer cervicis, occipitoscapularis, and the intervertebral muscles crossing lower cervical joints. During specialized, sagittal-plane movements such as grooming, well-defined patterns of synergy could be recognized that varied according to the degree of involvement of upper and lower cervical joint-sets. Movements in the horizontal plane were associated with EMG activity in a largely different subset of neck muscles including splenius, longissimus capitis and obliquus capitis inferior. The levels of EMG activity during flexion-extension or turning movements were much lower than those observed during other more vigorous behaviors, such as head shaking. Some neck muscles, such as clavotrapezius and sternomastoideus, could only be recruited during forceful or ballistic head movements. Results showed that the patterns of muscular activation were linked not only to the speed and trajectory of the movements of the skull, but also to the kinematics of the motion occurring across different parts of the cervical column.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259127
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 34
    Electronic Resource
    Electronic Resource
    Biomechanical organization of single motor units in two multi-tendoned muscles of the cat distal forelimb (1992)
    Springer
    Experimental brain research 88 (1992), S. 411-421 
    Details
    ISSN: 1432-1106
    Keywords: Motor unit ; Multi-tendoned muscle ; Mechanical partitioning ; Mechanical cross-coupling ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In anesthetized cats single motor units (MUs) of the extensor carpi ulnaris (ECU) and extensor digitorum communis (EDC) muscles were selectively activated by stimulation of cervical ventral root filaments. The distribution of force developed by single MUs at the four distal tendons of the EDC muscle and at three portions of the distal tendon of the ECU muscle was analysed. In general, single MUs of both muscles distributed force over all tendons in a unimodal pattern, with the maximal force levels generated at one specific tendon which was termed the best-tendon. Distributions of force were quantitatively described by a parameter representing the mean direction of force output (output-index) and a further one representing the dispersion of force over the distal tendons (divergence). Generally, these parameters and the best-tendon remained stable when a MU was stimulated at different frequencies, but varied from MU to MU. Despite the general stability of the force distribution, slight systematic changes were regularly found in EDC MUs, when they developed a higher amount of force due to a higher frequency of stimulation: the relative amount of force at the best-tendon increased; e.g. the MUs got more selective for the best-tendon. These changes were partly due to overcoming mechanical cross-coupling between neighbouring compartments of the EDC muscle. Such changes of force distribution were only found in a part of the ECU MUs; other ECU MUs did not change their force distribution at all or became less selective for the best-tendon. The phenomenon that MUs of multi-tendoned muscles distribute their force output to the distal tendons in specific patterns is probably due to mechanical partitioning of the parent muscles: the localization of spatial territories of MUs within different anatomical muscle compartments should correspond to the best-tendon. Complex mechanisms allowing passive transmission of force from limited territories along the transverse axis of both muscles must be assumed in order to explain why most MUs act on all tendons and why force distributions change with increasing stimulus frequency. In addition, specific relations between unit type and force distributions were found within both muscles. Fatigue-resistant EDC MUs have broader force distributions than fatigue-sensitive EDC MUs and slow ECU MUs were found to act predominantly on the most ulnar part of the distal tendon. These biomechanical properties of MUs are discussed as supporting the specific functions of the respective muscles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02259116
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 35
    Electronic Resource
    Electronic Resource
    Descending projections of Forel's field H neurones to the brain stem and the upper cervical spinal cord in the cat (1992)
    Springer
    Experimental brain research 88 (1992), S. 563-579 
    Details
    ISSN: 1432-1106
    Keywords: Forel's field H ; Diencephalon ; Reticular formation ; Neck motoneurone ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Descending projections from Forel's field H (FFH) to the brain stem and upper cervical spinal cord were studied in cats. 2. Following implantation of HRP pellets into the spinal gray matter (C1-C3) or in the ponto-medullary reticular formation, the nucleus reticularis pontis caudalis (NRPC) or in the nucleus reticularis gigantocellularis (NRG), numerous neurones were retrogradely labelled in FFH on the ipsilateral side. In the former cases, the sizes of labelled neurones were medium-large (20μ40 μm in diametre) while both small and medium-large neurones were labelled in the latter cases. 3. The lowest levels of spinal projection of single FFH neurones (n=70) were assessed by antidromic spikes elicited by stimulating electrodes placed in C1, C3 and C7. The majority (59%) projected to C1 (but not to C3), about 27% to C3 (but not to C7), and only 14% to C7. 4. Axonal trajectories of single FFH neurones in C1-C3 segments were investigated by antidromic threshold mapping methods. The stem axons of spinal-projecting FFH neurones descended in the ventral or in the ventrolateral funicli and the collaterals were projected to neck motor nuclei (lamina IX, Rexed 1954) and laminae V–VIII. The conduction velocities were estimated as 8–37 m/s from the antidromic latencies. 5. Axonal trajectories of 7 FFH neurones were investigated in the ponto-medullary reticular formation. All were antidromically activated from C1. In six neurones, the stem axons were located in the ventral part of the central tegmental tract and collaterals were projected to the NRPC and/or the NRG. Some of them projected to the inferior olive and the nucleus prepositus hypoglossi as well. The stem axon, in the remaining cell, was in the most dorso-medial part of the medial longitudinal fasciculus and collaterals were projected mainly to the dorsal part of the NRPC and the NRG, and also to the medial vestibular nucleus. 6. Anterograde transport of WGA-HRP injected into FFH revealed that in the upper cervical spinal cord, stem axons were found in the ventral funiculus and ventral part of the lateral funiculus. Collateral projections and presumed bouton-like deposits were observed in the laminae VI–IX, especially in their medial part. In the brain stem, dense bundles of the descending fibres were found in the central and the medial tegmental tracts and in the medial longitudinal fasciculus. FFH neurones projected densely to the caudal half of the NRPC and to the rostral half of the NRG. Extremely dense projections to the inferior olive were noted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228186
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 36
    Electronic Resource
    Electronic Resource
    Coordination of the legs of a slow-walking cat (1992)
    Springer
    Experimental brain research 89 (1992), S. 147-156 
    Details
    ISSN: 1432-1106
    Keywords: Walking ; Interlimb coordination ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary On the basis of behavioural studies the influences that coordinate the movement of the legs of a slowly walking cat have been investigated. The recording method applied here allows for the measurement of forward and backward movement of the legs which are called swing and stance movements, respectively. Influences etween contralateral legs, i.e. both front legs or both hind legs, are stronger than those occurring between ipsilateral legs, i.e. front and hind leg of the same side. Influences which coordinate the front legs seem to be of the same kind as those for the hind legs. These influences are symmetrical, which means that the same type of influence acts from right to left leg and in the reverse direction. Two types of influences are described for contralateral legs: 1. When the influencing leg performs a swing movement, the influenced leg is prevented from starting a swing movement. 2. When the influencing leg performs a stance movement, the probability that the influenced leg starts a swing movement increases as the influencing leg moves backwards during its stance movement. In contrast to contralateral coupling, the ipsilateral influences are asymmetric, i.e. a different influence acts from front to hind leg than does in the reverse direction. The front leg is influenced to start a swing when both legs have approached each other to a given value. The hind leg is influenced to start a stance movement after the front leg has begun its swing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229012
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 37
    Electronic Resource
    Electronic Resource
    Responses of neurons in the caudal medullary raphe nuclei of the cat to stimulation of the vestibular nerve (1992)
    Springer
    Experimental brain research 89 (1992), S. 323-332 
    Details
    ISSN: 1432-1106
    Keywords: Vestibular system ; Raphe nuclei ; Spinal cord ; Sympathetic nervous system ; Vestibulosympa ; thetic reflex ; Orthostatic hypotension ; Cardiovascular regulation ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the decerebrate cat, recordings were made from neurons in the caudal medullary raphe nuclei to determine if they responded to electrical stimulation of the vestibular nerve and thus might participate in vestibulo-sympathetic reflexes. Many of these cells projected to the upper thoracic spinal cord. The majority (20/28) of raphespinal neurons with conduction velocities between 1 and 4 m/s received vestibular inputs; 13 of the 20 were inhibited, and 7 were excited. Since many raphespinal neurons with similar slow conduction velocities are involved in the control of sympathetic outflow, as well as in other functions, these cells could potentially relay vestibular signals to sympathetic preganglionic neurons. The onset latency of the vestibular effects was long (median of 15 ms), indicating the inputs were polysynaptic. In addition, 34 of 42 raphespinal neurons with more rapid conduction velocities (6–78 m/s) also received long-latency (median of 10 ms) labyrinthine inputs; 26 were excited and 8 were inhibited. Although little is known about these rapidlyconducting cells, they do not appear to be involved in autonomic control, suggesting that the function of vestibular inputs to raphe neurons is not limited to production of vestibulosympathetic reflexes. One hypothesis is that raphe neurons are also involved in modulating the gain of vestibulocollic and vestibulospinal reflexes; this possibility remains to be tested.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228248
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 38
    Electronic Resource
    Electronic Resource
    Factors influencing neural activity in parabrachial regions during cat vocalizations (1992)
    Springer
    Experimental brain research 89 (1992), S. 341-351 
    Details
    ISSN: 1432-1106
    Keywords: Parabrachial region ; Vocalization ; Single-unit ; recordings ; Multiple-unit recordings ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The parabrachial nucleus in mammals is intimately connected with other vocalization controlling brainstem structures. It, along with ventromedially adjacent structures, also has been identified as the pneumotaxic center, and as such shows strong respiratory related activity in the anesthetized cat. The current study examines the neuronal activity in cat parabrachial regions during production of instrumentally conditioned vocalizations. Most of the units in our sample show considerable activity during periods between vocalizations. For many units, firing rate fluctuates during the respiratory cycle, although apparently not as strongly as reported in the decerebrate cat. Also, there is often strong phasic activity during periods where animals are licking to ingest their food rewards. During the peri-vocalization period, various neural activity patterns can be recorded. Most common is an activity increase during the vocalization itself. Moreover, in some units, this activity increase has an auditory component. A smaller number of units show other activity patterns, including a suppression of activity during vocalization and activity increases preceding the vocalization. Overall, our results suggest that the parabrachial region's involvement in vocal control is quite complex, involving convergence of respiratory, acoustic, vocalization-related, and perhaps somatosensory influences.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228250
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 39
    Electronic Resource
    Electronic Resource
    Two modes of cerebellar input to the parietal cortex in the cat (1992)
    Springer
    Experimental brain research 90 (1992), S. 241-252 
    Details
    ISSN: 1432-1106
    Keywords: Parietal cortex ; Thalamus ; Cerebellar nucleus ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The characteristics of cerebellar input to the parietal cortex through the ventroanterior-ventrolateral (VA-VL) complex of the thalamus were investigated in the adult cat by using combined electrophysiological and anatomical methods. Two distinct parietal regions were activated by stimulation of the cerebellar nuclei (CN). In the first region located in the depth of the bank of the ansate sulcus, stimulation of the CN induced early surface positive-deep negative potentials and late surface negative-deep positive potentials. In this cortical area, potentials of similar shape and time course were evoked at a shorter latency by stimulation of the ventrolateral part of the VA-VL complex where large negative field potentials were evoked by stimulation of the CN. After injection of the anterograde tracer Phaseolus vulgaris leucoagglutinin (PHA-L) in this part of the VA-VL complex, axon terminals of thalamocortical (TC) fibers were found in layers I, III and IV in the depth of the bank of the ansate sulcus and layers I and III in the motor cortex. In the second region located in the suprasylvian gyrus, late surface negative-deep positive potentials were evoked by stimulation of the CN and similar potentials were evoked at a shorter latency from the dorsomedial part of the VA-VL complex where large cerebellar-evoked potentials could be recorded. PHA-L injection in this thalamic region stained TC fibers and their terminals in layer I of the suprasylvian gyrus, and in layers I and III of the motor cortex. The laminar distribution of TC axon terminals in two different regions of the parietal cortex could account for the depth profiles of the cerebellar- and the thalamic-evoked potentials in each region. These results show that cerebellar information is conveyed to two separate areas in the parietal cortex by two different TC pathways.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227235
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 40
    Electronic Resource
    Electronic Resource
    Role of upper cervical inspiratory neurons studied by cross-correlation in the cat (1992)
    Springer
    Experimental brain research 90 (1992), S. 153-162 
    Details
    ISSN: 1432-1106
    Keywords: Respiration ; Neurons ; Axonal projections ; Spinal cord ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Axonal projections and synaptic connectivity of upper cervical inspiratory neurons (UCINs) were investigated in anaesthetised cats to clarify their role as propriospinal respiratory interneurons. Antidromic mapping showed axonal collaterals near phrenic and intercostal motonuclei. Of the UCINs tested, 37% had collaterals at T3-4; 55% had ipsilateral projections and 45% had contralateral projections. Ipsilateral or contralateral cross-correlations of the activity of pairs of UCINs (one on each side of the spinal cord) with the discharge of internal intercostal, external intercostal (T3-4) or phrenic nerves revealed similar features. Those with the internal intercostal and phrenic nerves were interpreted as evidence for shared or oligosynaptic excitation, those with the external intercostal nerve as shared excitation and inhibition. No evidence for monosynaptic connections was found. Monosynaptic connections could also not be demonstrated between inspiratory intercostal neurons located near (〈 0.5 mm) the UCINs collateral arborizations in T3-4, examined by cross-correlation. Afferent feedback from internal intercostal nerves (T3-4) was investigated by cross-correlating nerve stimulation with UCINs activity. Ipsilateral and contralateral cross-correlograms had similar features, providing evidence for excitation in some cases and inhibition in others. Finally, cross-correlations between ipsilateral UCINs and cervical sympathetic nerves were featureless. The results suggest that the role of UCINs as part of a respiratory propriospinal control system analagous to forelimb motor control is untenable, although they may be part of an intercostal afferent feedback loop.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00229267
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 41
    Electronic Resource
    Electronic Resource
    Functional coupling of the stabilizing eye and head reflexes during horizontal and vertical linear motion in the cat (1992)
    Springer
    Experimental brain research 91 (1992), S. 191-206 
    Details
    ISSN: 1432-1106
    Keywords: Eye-head coordination ; Stabilizing reflexes ; Visual and otolith systems ; Sinusoidal linear motion ; Neck muscles ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The otolith contribution and otolith-visual interaction in eye and head stabilization were investigated in alert cats submitted to sinusoidal linear accelerations in three defined directions of space: up-down (Z motion), left-right (Y motion), and forward-back (X motion). Otolith stimulation alone was performed in total darkness with stimulus frequency varying from 0.05 to 1.39 Hz at a constant half peak-to-peak amplitude of 0.145 m (corresponding acceleration range 0.0014–1.13 g) Optokinetic stimuli were provided by sinusoidally moving a pseudorandom visual pattern in the Z and Y directions, using a similar half peak-to-peak amplitude (0.145 m, i.e., 16.1°) in the 0.025–1.39 Hz frequency domain (corresponding velocity range 2.5°–141°/s). Congruent otolith-visual interaction (costimulation, CS) was produced by moving the cat in front of the earth-stationary visual pattern, while conflicting interaction was obtained by suppressing all visual motion cues during linear motion (visual stabilization method, VS, with cat and visual pattern moving together, in phase). Electromyographic (EMG) activity of antagonist neck extensor (splenius capitis) and flexor (longus capitis) muscles as well as horizontal and vertical eye movements (electrooculography, EOG) were recorded in these different experimental conditions. Results showed that otolith-neck (ONR) and otolith-ocular (OOR) responses were produced during pure otolith stimulation with relatively weak stimuli (0.036 g) in all directions tested. Both EMG and EOG response gain slightly increased, while response phase lead decreased (with respect to stimulus velocity) as stimulus frequency increased in the range 0.25–1.39 Hz. Otolith contribution to compensatory eye and neck responses increased with stimulus frequency, leading to EMG and EOG responses, which oppose the imposed displacement more and more. But the otolith system alone remained unable to produce perfect compensatory responses, even at the highest frequency tested. In contrast, optokinetic stimuli in the Z and Y directions evoked consistent and compensatory eye movement responses (OKR) in a lower frequency range (0.025–0.25 Hz). Increasing stimulus frequency induced strong gain reduction and phase lag. Oculo-neck coupling or eye-head synergy was found during optokinetic stimulation in the Z and Y directions. It was characterized by bilateral activation of neck extensors and flexors during upward and downward eye movements, respectively, and by ipsilateral activation of neck muscles during horizontal eye movements. These visually-induced neck responses seemed related to eye velocity signals. Dynamic properties of neck and eye responses were significantly improved when both inputs were combined (CS). Near perfect compensatory eye movement and neck muscle responses closely related to stimulus velocity were observed over all frequencies tested, in the three directions defined. The present study indicates that eye-head coordination processes during linear motion are mainly dependent on the visual system at low frequencies (below 0.25 Hz), with close functional coupling of OKR and eye-head synergy. The otolith system basically works at higher stimulus frequencies and triggers Synergist OOR and ONR. However, both sensorimotor subsystems combine their dynamic properties to provide better eyehead coordination in an extended frequency range and, as evidenced under VS condition, visual and otolith inputs also contribute to eye and neck responses at high and low frequency, respectively. These general laws on functional coupling of the eye and head stabilizing reflexes during linear motion are valid in the three directions tested, even though the relative weight of visual and otolith inputs may vary according to motion direction and/or kinematics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231654
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 42
    Electronic Resource
    Electronic Resource
    Corticocortical connections of cat primary somatosensory cortex (1992)
    Springer
    Experimental brain research 91 (1992), S. 425-434 
    Details
    ISSN: 1432-1106
    Keywords: SI ; SII ; Area 3b ; Area 2 ; Cytoarchitecture ; Forepaw ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The organization of corticocortical connections in the representation of the forepaw in cat primary somatosensory cortex (SI) was studied following injections of various tracers into different cortical cytoarchitectonic areas. Small injections of horseradish peroxidase, wheat germ agglutinin-conjugated HRP, Phaseolus vulgaris leukoagglutinin, or fast blue were placed into the representation of the forepaw in areas 3b, 1, or 2. The positions of labeled neurons in SI and the surrounding cortical areas were plotted on flattened surface reconstructions to determine the organization of the corticocortical connections within SI. A strong, reciprocal projection linked the two forepaw representations which have been described in area 3b and the part of area 2 which lies in the anterior bank of the lateral ansate sulcus (see Iwamura and Tanaka 1978a, b). Dense projections also linked these areas with SII, as previously reported (Burton and Kopf 1984a). Additional projections to area 3b arose primarily from areas 3a and 1. Projections to area 2 were more widespread than those to area 3b, and arose from all other areas of SI as well as from areas 4 and 5a. All injections into SI tended to label groups of neurons which lay in mediolateral strips. Corticocortical projection neurons which were most heavily labeled by SI injections were pyramidal cells in layer III. Additional projections from area 2 to 3b, area 5a to 2, and SII to areas 2 and 3b arose from layer VI as well. Although neurons of layers III and VI were always the most densely labeled, large injections into SI labeled neurons in layers II and V as well.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227839
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 43
    Electronic Resource
    Electronic Resource
    How complete is physiological compensation in extrastriate cortex after visual cortex damage in kittens? (1992)
    Springer
    Experimental brain research 91 (1992), S. 455-466 
    Details
    ISSN: 1432-1106
    Keywords: Brain damage ; Neural plasticity ; Striate cortex ; Extrastriate cortex ; Recovery of function ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Previous studies indicate that neurons in the cat's posteromedial lateral suprasylvian (PMLS) visual area of cortex show physiological compensation after neonatal but not adult damage to areas 17, 18, and 19 of the visual cortex (collectively, VC). Thus, VC damage in adults produces a loss of direction selectivity and a decrease in response to the ipsilateral eye among PMLS cells, but these changes are not seen in adult cats that received VC damage as kittens. This represents compensation for early VC damage in the sense that PMLS neurons develop properties they would have had if there had been no brain damage. However, this is only a partial compensation for the effects of VC damage. A full compensation would involve development of properties of the VC cells that were removed in the damage. The present study investigated whether this type of compensation occurs for detailed spatial- and temporal-frequency processing. Single-cell recordings were made in PMLS cortex of adult cats that had received a VC lesion on the day of birth or at 8 weeks of age. Responses to sine-wave gratings that varied in spatial frequency, contrast, and temporal frequency were assessed quantitatively. We found that the spatial- and temporal-frequency processing of PMLS cells in adult cats that had neonatal VC damage were not significantly different from PMLS cells in normal cats. Therefore, there was no evidence that PMLS cells can compensate for VC damage by developing properties that are better than normal and like those of the striate cortex cells that were damaged. We also assessed the effects of long-term VC damage in adult cats to determine whether the normal properties seen in cats with neonatal VC damage represent a compensation for abnormalities in PMLS cortex present after adult damage. In a previous study, we found that acute VC damage in adult cats has small but reliable effects on maximal response amplitude, maximal contrast sensitivity, and spatial resolution (Guido et al. 1990b). In the present study, we found that long-term VC damage in adult cats does not increase these abnormalities as a result of secondary degenerative changes. In fact, the minor abnormalities that were present after an acute VC lesion were virtually absent following a long-term adult lesion, perhaps because they were due to transient traumatic effects. Therefore, there was little evidence for abnormalities in spatial- or temporal-frequency processing following long-term adult VC damage for which PMLS cells might show compensation following long-term neonatal damage. Our results thus indicate that there is little or no difference in the spatial- or temporal-frequency processing of PMLS cells in normal cats and cats with long-term VC damage received early in life or as adults. These findings are discussed in relation to the inputs to PMLS cortex and to the behavioral abilities of cats with VC damage at different ages. The implications for under-standing the role of lateral suprasylvian visual cortex in behavioral recovery from VC damage is considered.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227841
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 44
    Electronic Resource
    Electronic Resource
    Trigeminal excitation of dorsal neck motoneurones in the cat (1992)
    Springer
    Experimental brain research 92 (1992), S. 183-193 
    Details
    ISSN: 1432-1106
    Keywords: Trigeminal afferents ; Trigeminospinal neurones ; Excitation ; Neck motoneurones ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Excitation of dorsal neck motoneurones evoked by electrical stimulation of primary trigeminal afferents in the Gasserian ganglion has been investigated with intracellular recording from α-motoneurones in the cat. Single stimulation in the Gasserian ganglion ipsi-and contralateral to the recording side evoked excitatory postsynaptic potentials (EPSPs) in motoneurones innervating the lateral head flexor muscle splenius (SPL) and the head elevator muscles biventer cervicis and complexus (BCC). The gasserian EPSPs were composed of early and late components which gave the EPSPs a hump-like shape. A short train of stimuli, consisting of two to three volleys, evoked temporal facilitation of both the early and late EPSP components. The latencies of the gasserian EPSPs ranged from 1.6 to 3.6 ms in SPL motoneurones and from 1.6 to 5.8 ms among BCC motoneurones. A rather similar latency distribution between 1.6 and 2.4 ms was found for ipsi- and contralateral EPSPs in SPL and BCC motoneurones, which is compatible with a minimal disynaptic linkage between primary trigeminal afferents and neck motoneurones. Systematic transections of the ipsi- and contralateral trigeminal tracts were performed in the brain stem between 3 and 12 mm rostral to the level of obex. The results demonstrate that both the ipsi- and contralateral disynaptic and late gasserian EPSPs can be mediated via trigeminospinal neurones which take their origin in the nucleus trigeminalis spinalis oralis. Transection of the midline showed that the contralateral trigeminospinal neurones cross in the brain stem. Systematic tracking in and around the ipsilateral trigeminal nuclei demonstrated that the axons of ipsilateral trigeminospinal neurones descend just medial to and/or in the medial part of the nucleus. Spinal cord lesions revealed a location of the axons of the ipsilateral trigeminospinal neurones in the lateral and ventral funiculi. Interaction between the ipsi- and contralateral gasserian EPSPs showed complete summation of the disynaptic EPSP component, while the late components were occluded by about 45%. These results show that the disynaptic EPSPs are mediated by separate trigeminospinal neurones from the ipsi- and contralateral side, while about half of the late EPSPs are mediated by common neurones which receive strong bilateral excitation from commissural neurones in the trigeminal nuclei. Spatial facilitation was found in the late gasserian EPSP but not in the disynaptic gasserian EPSP by conditioning stimulation of cortico- and tectofugal fibres. Disynaptic pyramidal and tectal EPSPs, which are mediated by reticulospinal neurones, were facilitated by a single stimulation in the gasserian ganglion at an optimal interval of 2 ms. It is suggested that primary trigeminal afferents can excite the reticulospinal neurones via a disynaptic trigeminoreticular pathway.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00227964
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 45
    Electronic Resource
    Electronic Resource
    Specific effects of the benzodiazepine midazolam on visual receptive fields in light and dark adapted human subjects (1992)
    Springer
    Psychopharmacology 109 (1992), S. 68-76 
    Details
    ISSN: 1432-2072
    Keywords: Visual system ; Visual receptive fields ; Subthreshold summation ; Shift effect ; Dark adaptation ; Benzodiazepines ; GABA ; Bicuculline ; Dopamine ; Levodopa ; Sulpiride ; Atropine ; Human ; Cat ; Psychophysics
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Psychophysical experiments in humans have revealed similar characteristics of visual receptive fields as were found in cats and monkeys from retinal ganglion cell recordings. In addition, in some retinal ganglion cells of cats the GABA antagonist bicuculline decreases the activity of the inhibitory surround. These findings led to two predicitions: 1) benzodiazepines will selectively increase the inhibitory surround of human visual receptive fields, 2) after dark adaptation, no free GABA will be available in the synapses and benzodiazepines will have no effect on the visual system. Characteristics of human receptive fields were determined by subthreshold summation: the contrast threshold of a vertical line was measured dependent on the distance of two parallel flanking lines whose contrast was below threshold. Both hypotheses were confirmed: the threshold in the inhibitory region of receptive fields was specifically increased in a dose-dependent manner by midazolam PO (7.5 mg:P〈0.05; 15 mg:P〈0.01). In dark-adapted subjects no effect of midazolam was found. Control experiments with atropine (1 mg IV), sulpiride (100 mg IM), and levodopa (100 mg PO) showed no specific effect. The visual system may be a model to bridge the gap between animal and human psychopharmacology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02245482
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 46
    Electronic Resource
    Electronic Resource
    Immuno-electron-microscopic localization of laminin and collagen type IV in normal and denervated tooth pulp of the cat (1992)
    Springer
    Cell & tissue research 270 (1992), S. 157-164 
    Details
    ISSN: 1432-0878
    Keywords: Dental pulp ; Laminin ; Collagen IV ; Odontoblast ; Nerve regeneration ; Immunocytochemistry ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The distribution of laminin-like immunoreactivity in adult normal and denervated cat mandibular tooth pulps was studied by the use of fluorescence microscopy and pre-embedding immunogold electron microscopy. Immunoreactivity to collagen IV was also assessed in order to distinguish basement membranes. In normal pulps, light-microscope laminin-like immunoreactivity was strong along blood vessels and Schwann cell sheaths, and a faint immunoreactivity was seen also in the odontoblast layer. Electron microscopy confirmed the laminin-like immunoreactivity of endothelial and Schwann cell basement membranes at all pulpal levels. In the odontoblast layer and the predentine, nerve-like structures lacking basement membranes but possessing strong membrane laminin-like immunoreactivity were encountered. In addition, a clear-cut laminin-like immunoreactivity of plasma membranes of the somata and processes of odontoblasts was seen. Observations on denervated pulps as well as pulps in which nerve regeneration had taken place did not reveal any changes in the pattern of laminin-immunoreactivity in basement membranes or odontoblasts. Distribution of collagen IV-like immunoreactivity was very similar to laminin-like immunoreactivity in basement membranes of blood vessels and Schwann cells, and appeared unaffected by denervation. The odontoblasts and nerve-like profiles in the odontoblast layer were devoid of collagen IV-like immunoreactivity. We propose that odontoblast-associated laminin could be of significance as guidance for regenerating terminal pulpal nerve fibers to appropriate targets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00381890
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 47
    Electronic Resource
    Electronic Resource
    Light-and electron-microscopic studies of the somatostatin-immunoreactive plexus in the cat retina (1992)
    Springer
    Cell & tissue research 267 (1992), S. 57-66 
    Details
    ISSN: 1432-0878
    Keywords: Retina ; Somatostatin immunoreactivity ; Amacrine cells ; Synapses ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Two monoclonal antibodies directed against somatostatin 14 were used to study immunoreactive neurons, their processes and their synapses in the cat retina. In retinal whole-mounts, a sparse population of wide-field displaced amacrine cells was observed predominantly in the ventral retina and near the retinal margin. Processes of these cells ramified mainly in two distinct strata within the inner plexiform layer: one near the inner nuclear layer (INL), and the other near the ganglion cell layer (GCL). The length of immunoreactive fibres within each plexus was measured: 232±32 mm/mm2 near the INL and 230±74 mm/mm2 near the GCL in all retinal regions. The immunoreactive processes were studied using electron-microscopic techniques; conventional and some ribbon-containing synapses (“dyads”) were found. Immunolabelled processes received input synapses from other amacrine cell processes. These investigations provide further evidence that this cell population has a diffuse, regulatory or modulatory role for visual-information processing in the inner plexiform layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00318691
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 48
    Electronic Resource
    Electronic Resource
    Chromatographic properties of macroporous beads from poly(GMA-co-EDMA) (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 139-150 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Eine Reihe makroporöser Glycidylmethacrylat-Ethylendimethacrylat-Copolymerer (GMA-co-EDMA) wurde durch Suspensionspolymerisation hergestellt; dabei wurden nach einer statistisch geplanten experimentellen Durchführung die Ethylendimethacrylatkonzentration und die Heizrate der Polymerisationstemperatur von 20 auf 70°C variiert. Die Porositätseigenschaften der hydrolysierten Copolymeren wurden mit Hilfe der Größenausschlußchromatographie unter Verwendung von Polystyrolstandards in Tetrahydrofuran charakterisiert. Das Porenvolumen, die spezifische Oberfläche und die Porengröße werden dabei durch die Konzentration des Vernetzungsmittels stärker beEinflußt als durch die Heizrate während der Polymerisation.
    Notes: A series of macroporous glycidyl methacrylate-ethylene dimethacrylate copolymers have been prepared by the suspension polymerization according to a statistical design of experimental approach in which concentration of ethylene dimethacrylate and time needed for raising the polymerization temperature from 20 to 70°C have been varied. The porous properties of hydrolyzed copolymers have been characterized by means of size exclusion chromatography using polystyrene standards in tetrahydrofuran. Pore volume, specific surface area, and pore size are affected by the crosslinking agent concentration rather than by the rate of temperature increase during the polymerization reaction.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051950111
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 49
    Electronic Resource
    Electronic Resource
    Synthese und koagulationsverhalten von hydrophilen copolymeren des acrylnitrils (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 171-190 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Copolymers of AN were prepared with variable molecular masses and with variable contents of methylacrylate (ASME) and sodiumallylsulfonate (NaAS), acrylamide (AA), itaconic acid (IS), polyethyleneglycol acrylate (600) (PEGA), vinylacetate (VA), 2-hydroxyethyl acrylate, (HEE) or sodium acrylamido-2-methylpropanesulfonate (NaAMPS), respectively, by using a mathematical model for the calculation of the polymerization conditions needed. Precipitation studies by light scattering showed the predominant influence of NaAS and NaAMPS on the precipitation properties. Acrylonitrile homopolymers show a hard precipitation behaviour. The originating particles have a density of between 0.2 and 0.4 g/cm3. An increasing content of NaAS or NaAMPS leads for example beginning from 0.8 wt.-% NaAS in the monomer composition to a soft precipitation behaviour and to highly swollen particles possessing a density of less than 1 · 10-2 g/cm3. The molar mass and the ASME-content show no significant influence. For the acrylonitrile/acrylamide system already 0.5 wt.-% allylsulfonate is sufficient to get a soft precipitation behaviour with formation of highly swollen particles. All samples with the other cocomponents and without NaAS- or NaAMPS-comonomer show a hard precipitation behaviour with little swollen particles.
    Notes: Copolymere des Acrylnitrils (AN) mit variabler Molmasse bzw. mit variablem Anteil von Acrylsäuremethylester (ASME) und Natriumallylsulfonat (NaAS), Acrylamid (AA), Itaconsäure (IS), Polyethylenglykolacrylat (600) (PEGA), Vinylacetat (VA), Acrylsäure-2-hydroxyethylester (HEE) oder Natrium-2-acrylamido-2-methylpropansulfonat (NaAMPS) wurden hergestellt, wobei die erforderlichen Polymerisations-bedingungen mit Hilfe eines mathematischen Polymerisationsmodells ermittelt wurden.Die Fällungsuntersuchungen mit der Methode der Lichtstreuung zeigten, daß NaAS und NaAMPS einen dominierenden Einfluß haben. Bei Acrylnitril-Homopolymeren tritt eine harte Fällung auf, und die entstehenden Partikel haben eine Dichte zwischen 0,2 und 0,4 g/cm3. Zunehmender NaAS-bzw. NaAMPS-Gehalt führt ab einem Gehalt von beispielsweise ca. 0,8 Gew.-% NaAS im Monomergemisch zu einer weichen Fällung, bei der hochgequollene Partikel mit einer Dichte in der Größenordnung von 〈 1.10-2 g/cm3 entstehen. Ein Einfluß der Molmassen und des ASME-Gehaltes Konnte nicht nachgewiesen werden. Beim Acrylnitril/Acrylamid-System genügen offensichtlich 0,5 Gew.-% Allylsulfonat im Monomeransatz, um eine stabile, weiche Fällung unter Bildung hochgequollener Strukturen zu gewährleisten. Alle Proben mit den übrigen hydrophilen Cokomponenten zeigen ohne NaAS bzw. NaAMPS-Comonomer ein hartes Fäungsverhalten mit wenig gequollenen Partikeln.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051950114
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 50
    Electronic Resource
    Electronic Resource
    Mitteilungen (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 213-213 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051950117
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 51
    Electronic Resource
    Electronic Resource
    Photolytic crosslinking of poly(p-hydroxystyrene) (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 191-204 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Photovernetzung von Poly(p-hydroxystyrol) (PPHS) wird durch O2 beachtlich beschleunigt. Dies ergab sich aus der Bestimmung der Molmasse (mit Hilfe der Lichtstreumethode) und des Gelanteils nach kontinuierlicher Bestrahlung bei λinc = 254 nm. Aufgrund von Ergebnissen aus Blitzphotolyseversuchen wird der folgende Reaktionsmechanismus aufgestellt: Die Vernetzung sowohl in An-als auch Abwesenheit von O2 kommt im wesentlichen durch Kombination von Radikalen des Phenoxyltyps zustande. In Abwesenheit von O2 werden Phenoxylradikale ausschließlich durch Spaltung von O—H-Bindungen phenolischer Gruppen, die sich im angeregten Singulettzustand befinden, erzeugt. Triplett-angeregte phenolische Gruppen, die sich auch bilden, desaktivieren nicht durch Spaltung der O—H-Bindungen. Sie reagieren allerdings sehr effektiv, sofern vorhanden, mit O2. Bei dieser Reaktion entstehen HO·2- und zusätzliche Phenoxylradikale. Alle handelsüblichen und die meisten im Labor synthetisierten PPHS-Proben enthalten chemisch gebundene, chinoidartige Verunreinigungen. Durch Versuche mit niedermolekularen Modellverbindungen wurde nachgewiesen, daß triplett-angeregte chinoide Gruppen einerseits mit phenolischen Gruppen unter Bildung von Phenoxylradikalen reagieren und daß sie andererseits unreaktiv sind bezüglich der Abstraktion aliphatischer Wasserstoffatome. Die Bestrahlung von PPHS bei λinc = 254 nm bewirkt die Bildung chinoider Gruppen, die bei dieser Wellenlänge auch stark absorbieren. Die Lichtabsorption dieser Gruppen wird im Laufe der weiteren Bestrahlung zum bestimmenden Faktor hinsichtlich der photochemischen Veränderung des Polymeren.
    Notes: Light-induced crosslinking of poly(p-hydroxystyrene) (PPHS) is significantly enhanced by O2. This was evidenced by molar mass (light scattering measurements) and by gel content determinations which were performed on various polymer samples before and after continuous irradiation at λinc = 254 nm. The following mechanism was elucidated with the aid of flash photolysis studies: Crosslinking in the absence or presence of O2 is mainly due to the combination of phenoxyl type radicals. In the absence of O2 the latter are exclusively formed by O—H bond cleavage of singlet excited phenolic groups. Triplet excited phenolic groups which are also formed do not deactivate via O—H bond cleavage but react very effectively with O2. This reaction leads to the formation of HO2· and additional phenoxyl type radicals. All Commercial and most laboratory-prepared PPHS samples contain chemically bound impurities of quinoid nature. On the basis of results performed with model compounds of low molar mass, it is concluded that triplet excited quinoid groups react effectively with phenolic groups forming phenoxyl type radicals and that they are quite unreactive with respect to the abstraction of alphatic hydrogen atoms. Irradiation of PPHS at λinc = 254 nm causes the formation of quinoid groups which absorb strongly at this wavelength. Light absorption by these groups becomes a determining factor with respect to photochemical alteration in the course of further irradiation.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051950115
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 52
    Electronic Resource
    Electronic Resource
    Polyacetal/poly(tetrafluoroethylene) blends, I. The effect of Na-treated poly(tetrafluoroethylene) on polyacetal (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 21-35 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die verschiedenartigen Eigenschaften von Polymerlegierungen aus Polyoxymethylen (POM) und bis zu 20 Gew.-% chemische oberf;ächenbehandeltem Poly(tetrafluorethylen) (CPTFE) wurden untersucht und denen unbahandelter POM/PTFE- Blends gegenübergestellt. PTFE iwrd POM zugesetzt, um dessen Oberflächenabriebseigenschaften Anteil zunehmend verschlechtert. Durch die bessere Phasenanbindung in den oberflächenbehandelten POM/CPTFE- Blends konnten die doppelten Zugfestigkeiten und EModuli wie bei unbehandelten POM/PTEF- Blends erreicht werden. Mit Hilfe der Elektronenmikroskopie (SEM) konnte gezeigt werden, daß die PTEF-Agglomerate in der POM-Matrix eine Größe von 30 bis 100 μm haben, während die CPTFE-Teilchengrößbe unter 1 μum liegt.
    Notes: The various properties of the blends of polyacetal (POM) with up to 20 wt.-% chemically surface-treated poly(tetrafluoroethylene) (CPTFE) were investigated and compared with those of POM/PTFE blends. The PTFE is added to POM to improve the wear properties, however, the mechanical properties of POM/PTFE blends decrease with increasing PTFE content, but tensile strength and Young's modulus of POM/CPTFE blends are more than 2 times higher than that of the POM/PTFE blends. SEM shows that the size of inherent agglomerative PTFE is in the range of 30 to 100 μm. The particle size of major CPTFE dispersed in POM is smaller than 1 μm.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 53
    Electronic Resource
    Electronic Resource
    Synthesis and chemo-physical properties of hydrogels (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 49-61 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Hydrogele wurden aus methylmethacrylat (MMA) and N-Vinyl-2-pyrrolidon (NVP) mit 1,2,2-Trimethylolpropantrimethacrylat (TPTA) als Vernetzungsmittel hergestellt. Die Terplymerisation wurden mittels UV-strahlung (365 nm) initiiert, wobei kleine Mengen an Diethoxycetophenon (DEAP) als Photosensibilisator sowie Triethanolamin(TEA)als Beschleuniger und Verdünner verwendet wurden. Die Hydrogele wurden durch Messung des Wasserrückhaltevermögens, der Sauerstodiffusions- und permitionskoeffizienten, der mechanischen Eigenschaften und der Lichtdurchlässigkeit charakterisiert. Dabei zeigte sich, daß die Hydrogele bis zu 80 Gew.-% Wasser aufnehmen können, wobei mit steigendem Wassergtehalt deren mechanische Festigkeit drastisch sinkt. Der Ssuerstoffdiffusionskoeffizient der gequollenen Hydrogele beträgt 10-6 cm2s-1, der Sauerstoffpermeationskoeffizient 1013 cm2s-1Pa-1, und die Lichtdurchlässigkeit liegt im Bereich von 500 bis 700 nm bei über 90%.
    Notes: Hydrogels are synthesized from methyl methacrylate (MMA) and N-vinyl-2-pyrrolidone (NVP) with 1,1,1-trimethylol propane trimethacrylate (TPTA) as a crosslinking agent. It was polymerized under UV radiation (365nm) with a small amount of photosensitizer, diethoxy acetophenone (DEAP), acclerator and diluent, triethanol amine (TEA). The hydrogels were characterized by measuring the water retention, dissolved oxygen diffusivity and permeability, mechanical strength, and light transparency. The hydrogels can retain water up to 80 wt.-% and the mechanical strenght is weakened as the water content is increased in the gel. The dissolved oxygen diffusivity and permeability in the swelling hydrogels are determined to be 10-6 cm2/sec and 1013 cm2s-1 Pa-1, respectively. The light transparency is over 90% in the wave lenght ranging from 500 to 700 nm.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960104
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 54
    Electronic Resource
    Electronic Resource
    Synthesis and properties of cationic amine-epoxy adducts and their use in electrodeposition, IIPart I cf. 12.. Diethanolamine/diketimine terminated cationic epoxy resins with pendent 2-ethylhexanol-blocked TDI groups (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 73-87 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ein Bisphenol-A-Epoxidharz wurde zunächst mit Toluylendiisocyanat, dessen eine Isocyanatgruppe mit 2-Ethylhexanol blockiert war, und dann mit unterschiedlichen Mischungen on Diethanolamin und Bis(2-methyl-isobutylketiminoethyl)amin (DKI)umgesetzt. Aus diesen Harzen mit Triethanolamin- und DKI-Endgruppen wurden durch Hydrolyse und Neutralisieren mit Essigsäure kationische Harze mit primären Amin-Endgruppen erhalten, aus denen mit geeigneten Lösungsmitteln und deionisiertem Wasser Emulsionen hergestellt wurden. Deren Eigenschaften und die Elektroabscheidung der Harze aus den Emulsionen wurden untrsucht. Der Effekt der Zugabe von hydrophoben Lösungsmitteln wie Toluol oder Hexylcellosolv (HCS) auf die Abscheidungseigenschaften wird diskutiert.
    Notes: A diglycidylether of bisphenol A epoxy resin (DGEBA) was first reacted with 2,4-toluene diisocyanate partially blocked with 2-ethylhexanol (2-EH P. B. TDI) to form modified epoxy resins, and subsequently reacted with different molar ratios of diethanolamine and bis(2-methylisobutylketiminoethyl)amine (DKI) (used as ring opening agents) to give diethanolamine/diketimine terminated resins. These resins were hydrolyzed and neutralized with acetic acid to give cationic resins containing various contents of primary amine groups in the terminal polymeric chain. These cationic resins can be dissolved in a suitable solvent and mixed with deionized water to obtain emulsions. The electrodeposition properties and characteristics of the resulting cationic resins were investigated in detail. The effects of hydrophobic solvents, such as hexyl cellosolve (HCS) and toluene, on the deposition properties of the emulsions are discussed.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960106
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 55
    Electronic Resource
    Electronic Resource
    On the polymerization of acrylonitrile in the presence of some unsaturated triazine derivatives (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 107-111 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die radikalische Polymerisation von Acrylnitril in Gegonwart verschiedener ungesättigter optischer Aufheller (FB) (Derivate des 1,3,5-Triazins) wurde untersucht. Kolorimetrische Messungen ergaben, daß mehr als 80% des optischen Aufhellers in die Polymerkette eingebaut werden. Zur Erzielung eines intensiven optischen Effektes genügt eine FB-Anfangskonzentration von 0,1 Gew.-%, bezogen auf Acrylnitril.
    Notes: The polymerization of acrylonitrile in the presence of some unsaturated, triazinebased fluorescent brighteners (FB) has been investigated. It was found colourimetrically that more than 80% of the FB is incorporated in the polymer. The initial concentration of 0.1 wt.-% is sufficient to obtain a good bleaching effect without significant decrease of the molecular weight.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 56
    Electronic Resource
    Electronic Resource
    Tough thermoplastic polyesters by reactive extrusion with epoxy-containing copolymersPaper presented at the Sixth Annual Meeting of the Polymer Processing Society at Nice, April 17-20, 1991. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 89-99 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Les polyesters thermoplastiques (PBT et PET) sont des polymères fragiles avec une résistance au choc entaillée faible. Leur renforcement peut être obtenu par extrusion réactive avec dirrérents types de copolymères élastomères de l'éthylène, contenant des fonctons à réactivité potentielle avec extrémités de chaîne acide et hydroxyle des polyesters.Deux types de copolymères ont été étudiés: Ethylène(acrylate d'éthyle/méthacrylate de glycidyle (E/EA/GMA), et éthylène/acrylate d'éthyle/anhydride maléique (E/EA/MAH). Les alliages ont été obtenu par malaxage de 10 à 25% de coppolymères avec du PBT.Le PBT présente une transition fragile, ductile lorsqu'on passe de 10 à 20% de particules dispersées de copolymère au GMA. Les gains les plus importants en résistance au choc sont obtenus en réticulant partiellement la phase dispersée, par association de copolymères en GMA et de copolymères avec MAH et catalyseur de réaction.
    Notes: Poly(butylene terephthalate) (PBT) and poly(ethylene terephthalate) (PET) are brittle polymers with poor notched impact strength. Their toughening can be achieved by melt blending with different types of rubbery ethylene copolymers containing functions having potential reactivity with the hydroxy and carboxy end groups in polyesters.Two types of ethylene copolymers were investigated: ethylene/ethyle acrylate/glycidyl methacrylate (E/EA/GMA) and ethylene/ethyl acrylate/maleic anhydride (E/EA/MAH) copolymers. The blends were obtained by reactive extrusion of PBT with 10 to 25% of copolymers.PBT blends undergo a brittle to ductile transition by toughening with GMA copolymer between 10 and 20% of rubbery phase. The most effective toughening could be achieved by a partial crosslinking of the rubbery particles obtained by associating GMA and MAH copolymers and a reaction catalyst.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 57
    Electronic Resource
    Electronic Resource
    Relation between polymer surface tension and orientation of thermotropic liquid crystals (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 101-106 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Orientierung (Neigungswinkel ϕ) von thermotropen Flüssigkristallen (LC) an der Grenzfläche zu polymerbeschichteten Substraten wird nicht nur durch den numerischen Wert der Oberflächenspannung \documentclass{article}\pagestyle{empty}\begin{document}${\rm \gamma }_{\rm S} {\rm }\left( {{\rm \gamma }_{\rm S} {\rm = \gamma }_{\rm S}^{\rm d} {\rm + \gamma }_{\rm S}^{\rm p} } \right)$\end{document} bestimmt. Das Verhältnis zwischenden dispersiven und polaren Anteilen an \documentclass{article}\pagestyle{empty}\begin{document}${\rm \gamma }_{\rm S} {\rm }\left( {{\rm \gamma }_{\rm S}^{\rm d} {\rm : \gamma }_{\rm S}^{\rm p} } \right)$\end{document} beeinflußt ebenfalls die Orientierung der LC-Moleküle an der Substratoberfläche. Als Polymere wurden ein Polyimid und ein Midgruppenhaltiges Styrol/Maleinsäureanhydrid-Copolymeres verwendet.
    Notes: The orientation (tilt angle ϕ) of thermotropic liquid crystals (LC) on the interface to a polymer-coated surface is not only determined by the numerical value \documentclass{article}\pagestyle{empty}\begin{document}${\rm \gamma }_{\rm S} {\rm }\left( {{\rm \gamma }_{\rm S} {\rm = \gamma }_{\rm S}^{\rm d} {\rm + \gamma }_{\rm S}^{\rm p} } \right)$\end{document} of the substrate surface tension. However, the ratio between the dispersive and the polar part of \documentclass{article}\pagestyle{empty}\begin{document}${\rm \gamma }_{\rm S} {\rm }\left( {{\rm\gamma }_{\rm S}^{\rm d} {\rm : \gamma }_{\rm S}^{\rm p} } \right)$\end{document} also influences the LC orientation on the substrate surface. A polyimide and an amide-modified styrene/maleic anhydride copolymer were used as polymers.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 58
    Electronic Resource
    Electronic Resource
    Preparation of prepolymers from diglycidylether of bisphenol A containing imide groups (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 129-137 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Epoxidharze aus Bisphenol A wurden mit neuen Diphenolen, die Imidgruppen enthalten, modifiziert, um die thermischen Eigenschaften zu verbessern. Die verwendeten Diimiddiphenole wurden aus Dianhydriden und Aminophenolen durch Kondensation hergestellt. Die Diimiddiphenole und die modifizierten Harze wurden durch IR- und NMR-spektroskopische Messungen charakterisiert. Das thermische Verhalten wurde anhand von DSC- und TGA-Messungen untersucht.
    Notes: Epoxy resins derived from Bisphenol A have been modified with new diphenols containing imide moieties in order to improve their thermal properties. The diphenols have been synthesized from dianhydrides and aminophenols by condensation reactions. Diphenols as well as modified resins have been characterized by IR and NMR spectroscopy. The thermal characteristics were evaluated by DSC and TGA.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051950110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 59
    Electronic Resource
    Electronic Resource
    Die kristallisation eines geschmolzenen molekülkomplexes aus hochmolekularem polyoxyethylen und harnstoff (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 195 (1992), S. 165-170 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The structural transformation of a molecular complex (MC) of polyoxyethylene and urea on cooling from the molten state has been investigated by DSC and X-ray analysis. A high-temperature polymorphic from of the MC was found to be formed, which transforms into the known crystal form of the MC with a hexagonal crystal modification on cooling.
    Notes: Die Strukturveränderungen eines Molekülkomplexes (MK) aus Polyoxyethylen und Harnstoff beim Abkühlen aus dem geschmolzenen Zustand werden kalorimetrisch und röntgenographisch untersucht. Es wird festgestellt, daß eine polymorphe Hochtemperaturform des MK entsteht, die beim Abkühlen in die bekannte Kristallform des MK mit hexagonaler Kristallmodifikation übergeht.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051950113
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 60
    Electronic Resource
    Electronic Resource
    Effect of ring size on the oxidizability of lactams (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 143-154 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Anfangsstadium der Oxidation von Lactamen wurden im Temperaturbereich 70-120°C Cuntersucht. Es wurde festgestellt, daß Pyrrolidon und Piperidon bedeutend schneller oxidiert werden als die sieben-, acht- und dreizehngliedrigen Lactame sowie lineare N-Alkylamide. Die hohe Oxidierbarkeit der fünf- und sechsgliedrigen Lactame kann der leichteren homolytischen Spaltung der N- vicinalen C—H Bindung und der unterschiedlichen Reaktivität der Lactamradikale im Wachstuschritt der Kettenoxidation zugeschrieben werden.
    Notes: The initial stage of oxidation of lactams was studied in the temperature range 70-120°C. It was found that pyrrolidone and piperidone are oxidized essentially more easily than the seven-, eight-, nine- and thirteen-membered lactams as well as linear N-alkylamides. The high oxidizability of the five- and six-membered lactams may be attributed to the easier homolytic splitting of the N-vicinal C—H bond and to the different reactivity of lactam radicals in the propagation step of the chain oxidation.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 61
    Electronic Resource
    Electronic Resource
    Reaktionsverhalten des Natriumallylsulfonats in der Lösungscopolymerisation des Acrylnitrils in Dimethylformamid (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 127-141 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The relative chain transfer constant for sodium allylsulfonate (NaAS) in the copolymer system acrylonitrile (AN)/methylacrylate (MA) in dimethylformamide (DMF) was determined to be Cx = 0,04 ± 0.01, independent of the initiator used (azoisobutyronitrile, ammoniumperoxodisulfate).The chain transfer reaction explains the influence of NaAS on the polymerization degree, but not the concentration dependence of the copolymerization reactivity ratio r1 · r1 depends on the transfer reaction only in a range of 1 - 5%.The extended Debye-Hückel theory for dilute electrolytes has been successfully tested for a quantitative dependence of r1 from NaAS concentration. The resultant r10-value for infinite dilution of NaAS obviously depends on the acrylonitrile concentration, but only to a small extent (e.g. r10 = 0.32 for [AN] =- 4.26 mol/l). This theory provides comfortable access to resolve the nonideal AN/NaAS copolymerization. This approach may be generally applicable to copolymerizations of monomers with dissociated groups.
    Notes: Im Copolymerisationssystem Acrylnitril (AN)/Methylacrylat(MA) mit Natriumallylsulfonat (NaAS) in Dimethylformamid wurde die relative Übertragunskonstante zum NaAS Cx = 0,04 ± 0,01 unabhängig vom verwendeten Initiator (Azoisobuttyronitril, Ammoniumperoxodisulfat) ermittelt. Die Übertragunsreaktion beschreibt den Einfluß des NaAS auf den Polymerisationsgrad, sie beeinflußt jedoch den Copolymerisationsparameter r1 nur in der Größenordung von 1 bis 5% und kann damit die Konzentrationsabhängigkeit von r1 nicht erklären.Mit Hilfe der erweiterten Debye-Hückel-Theorie für verdünnte Elektrolyte wird die Abhängigkiet des r1-Wertes von der NaAS- Konzentration beschrieben. Der sich daraus für unendliche Verünnung des NaAS ergebende r10-Wert ist offensichtlich noch gerinfügig von der Acrylnitrilkonzentration abhägig. Er liegt beispielsweise für [AN] = 4, 26 mol/1 bei r10 = 0, 32. Damit wurde zum ersten Mal das nichtideale Copolymerisationsverhalten im untersuchten System erkärl. Das Vorgehen sollte verallemeinerungsfähig sein und generell auf das Copolymerisationsverhalten von Monomeren mitdissoziierten Gruppen angewendet werden können.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960111
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 62
    Electronic Resource
    Electronic Resource
    Photosynthetic membranes, 21. Immobilization of catalase by photochemically grafted ultrafiltration membranes (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 169-177 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Katalase wurde durch photoinduzeirte Propfpolymerisation auf mikroporöse polymere Trägermembranen immobilisiert. Die katalytische Aktivität für Zersetzung von Wasserstoffperoxid unter Ultrafitrationsbedingungen wurde mittels eines Rezirkulationsapparates untersucht. Die Membranen zeigten ein sehr gutes katalytisches Verhalten; die Enzymreaktion fand ausschließlich in der Membranstruktur statt. Anfangsreaktionsgeschwindigkeiten, gemessen in einem Temperaturbereich von 5-35°C als Funkation der Substratkonzentration und der Menge des immobilisierten Enzyms pro Einheit Membranoberfäche zeigten, daß sich der Reaktionsmechanismus der Katalase durch die Immobilisierung nicht verädert.
    Notes: Catalase has been immobilized in membranes prepared by photoinduced grafting onto microporous polymeric supports and its catalytic activity on hydrogen peroxide decomposition has been studied under ultrafiltration conditions by means of a recirculation apparatus. The membranes showed a very good catalytic performance and the enzyme reaction took place exclusively within the membrane structure. Initial reaction rates measured in the temperature range 5 - 35°C as a function of both substrate concentration and enzyme amount immobilized per unit membrane surface indicate that the mechanism of action of catalase is not altered after immobilization.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960114
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 63
    Electronic Resource
    Electronic Resource
    Untersuchungen zum Netzwerkbildungsprozeß bei der Reaktion von Bisphenol A-Diglycidylether mit 4,4′-Diaminodiphenylmethan (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 195-206 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The network formation process of bisphenol A-diglycidylether and 4,4′-diaminodiphenylmethane was investigated by measuring the torque, the conductivity and the soluble part of the crosslinking system. The activation energy for the curing process was estimated from gel time. The volume shrinkage during network formation was measured. The influence of N,N-dimethylbenzylamine as accelerator was discussed.
    Notes: Der Aufbau von Netwerken aus Bisphenol A-Diglycidylether und 4,4′-Diaminodiphenylmethan wurde durch Messung des Drehmomentes, der Leitfähigkeit und durch Bestimmung der löslichen Anteile des vernetzenden System untersucht. Aus den Gelzeiten wurden die Aktivierungsenergie für den Vernetzungsprozeß bestimmt. Außerdem wurde die während der Vernetzung aufretende Volumenschwindung gemessen. Der Einfluß von N, N-Dimethylbenzylamin als Beschleuniger auf den Vernetzungsprozeß wird diskutiert.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960116
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 64
    Electronic Resource
    Electronic Resource
    Oberflächenstrukturierung polymerer Fasern durch UV-Laserbestrahlung. 13. Oberflächenstrukturierung von HochleistungsfasernTeil 12 cf. Lit.5. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 196 (1992), S. 179-194 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The UV-laser induced surface modification of various types of high-performance fibers is investigated. Due to the high UV-absorption coefficients, the well-known effect of UV-laser induced etching (ablation) is observed with all fiber types. Furthermore, the relaxation of orientated macromolecules leads to a characteristic structuring of the fiber surface. For a possible controlled use of this physical surface modification, exact conditions for the treatment in view of textile applications are determined. Useful constants like threshold of ablation, etching rate and structuring constants are measured for all fiber types.
    Notes: Die Oberflächenbehandlung von unterschiedlichen Hochleistungsfasertypen mit gepulstem UV- Laserlicht wird untersucht. Bedingt durch die hohen UV-Absorptionskoeffizienten dieser Materialien wird der bekannte Effekt des UV-laserinduzierten Abtrags (Ablation) bei allen Fasern beobachtet. Zusätzlich werden durch die Relaxation der orientierten Makromoleküle charakteristische Strukturierungen auf der Faseroberfläche ausgebildet. Für einen möglichen kontrollierten und gezielten Einsatz dieser physikalischen Oberflächenmodifizierung in textilen Anwendungen werden die gnaunen Bedingungen der Laserbestrahlung ermittelt und beschieben. Darüber hinaus werden geeignete Konstanten der Laserbearbeitung wie Ablationsschwellenenergie, Ätzraten und Strukturierungskonstanten für verschiedene Fasertypen bestimmt.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051960115
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 65
    Electronic Resource
    Electronic Resource
    Kinetics of the free radical polymerization of dimethyl diallyl ammonium chloride, 5Part 4 cf. Acta Polym. 35 (1984) 350.. Kinetic model with persulfate as initiator (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 165-178 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Polymerisation von Dimethyl-diallyl-ammoniumchlorid in konzentrierter wäßriger Lösung mit Persulfat als Initiator kann bis zu hohen Umsätzen mit einem Modell beschrieben werden, in dem folgende Teilreaktionen berücksichtigt werden: a)Primärradikalbildung durch aktivierten Initiatorzerfall sowie Redoxreaktion von S2O2-8 und Cl-b)Kettenwachstum über Monomerkationassoziate undc)Kettenabbruch durch Kombination von cyclisierten Polymerradikalen untereinan der und mit Chloratomen.Für die Polymerisationsgeschwindigkeit wird ein Zeitgesetz hergeleitet, für dessen Konstanten und Parameter numerische Werte ermittelt wurden.
    Notes: The polymerization of dimethyl diallyl ammonium chloride in concentrated aqueous solution with persulfate as an initiator can be described up to high conversion by a kinetic model including a)formation of primary radicals by activated initiator decomposition as well as by redox reaction of S2O82- and Cl-,b)chain propagation via monomer cation associates andc)termination by combination of cyclized polymer radicals between each other or with chlorine atoms.A kinetic expression for the rate of polymerization is presented; rate constants and model parameters have been determined.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980114
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 66
    Electronic Resource
    Electronic Resource
    Announcements (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 199-199 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980117
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 67
    Electronic Resource
    Electronic Resource
    Synthesis and transition metal complex binding of amines and amides covalently bound to crosslinked polystyrene (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 179-190 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Polymere mit über eine C—C-Verknüpfung an hochvernetztem Polystyrol kovalent gebundenen, makrocyclischen Amiden wurden durch die Reaktion polymergebundener Malonsäureester-Gruppen mit offenkettigen Diaminen dargestellt. Die Reaktion von vernetztem, chlormethyliertem Polystyrol mit makrocyclischen und offenkettigen Aminen führt zu Polymeren mit kovalenter Bindung über eine C—N-Verknüpfung. Die erhaltenen funktionalisierten Polymeren wurden hinsichtlich der Adsorption von Cu(II)-, Ni(II)- und Co(II)-Ionen aus wäßriger Lösung untersucht.
    Notes: Polymers containing moieties of amides covalently bound to highly crosslinked polystyrene by C—C connections were prepared via a polymer-bound malonic ester group in the reaction with open-chain diamines. The reaction of crosslinked, chloromethylated polystyrene with macrocyclic and open-chain amines results in covalent binding by C—N-connection. The synthesized functionalized polymers were investigated for uptake of Cu(II), Ni(II) and Co(II) ions from aqueous solutions.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980115
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 68
    Electronic Resource
    Electronic Resource
    Synthesis of a poly(terephthaloylphosphine) (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 1-6 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Poly(phenylphosphindiylterephthaloyl), ein neues phosphorhaltiges Polymeres, wurde durch Lösungspolykondensation von Dilithium(phenyl)phosphin mit Terephthaloylchlorid bei niedriger Temperatur hergestellt. Es ist in polaren aprotischen Lösungsmitteln löslich; die inhärente Viskosität in DMF bei 30°C beträgt 19 ml/g. Das Polymere wurde mittels Elementaranalyse sowie IR- und 1H-NMR-Spektroskopie charakterisiert. TGA-Messungen ergeben, daß das Polymere in Luft bis 250°C stabil ist; es ist selbstverlöschend.
    Notes: Poly(phenylphosphinediylterephthaloyl), a novel phosphorus-containing polymer, was synthesized by low-temperature solution polycondensation of dilithio(phenyl)-phosphine with terephthaloyl chloride. The resulting polymer is soluble in polar aprotic solvents, having inherent viscosity of 19 ml/g in DMF at 30°C. The polymer was characterized by elemental analysis, IR and 1H-NMR spectroscopy. TGA data show that the polymer is stable up to 250°C in air. The polymer was found to be self-extinguishing.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990101
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 69
    Electronic Resource
    Electronic Resource
    Extension of the measuring range in size exclusion chromatography to higher molar mass by use of a light scattering detectorDedicated to Professor Dr. Dr. h. c. mult. Otto Kratky on the occasion of his 90th birthday (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 7-14 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine neue Methode für die Erweiterung des Meßbereiches der Ausschlußchromatographie, gekoppelt mit Lichtstreuung (SEC/LALLS), zu höherer molarer Masse, vorgestellt. Diese Methode nützt den Effekt, daß das Lichtstreusignal oft schon bei wesentlich kleineren Werten des Elutionsvolumens, also hoheren Werten der molaren Masse erfaßbar ist als das Konzentrationssignal und berücksichtigt dabei die Peakverbreiterung in der SEC. Das betreffende Rechenverfahren wird für den Fall einer logarithmischen Normalverteiung und einer wahrscheinlichsten Verteilung getestet. Im Falle von Polypropylen mit logarithmischer Normalverteilung (M̄W = 420 000 und M̄n = 99 000) kann der durch SEC/LALLS erfaßte Bereich der molaren Masse um einen Faktor von ca. 10 erweitert werden; bei einer wahrscheinlichsten Verteilung (M̄n = 100 000) liegt die erreichbare Erweiterung des Meßbereiches der molaren Masse beieinem Faktor von ca. 2.
    Notes: A new method for the extension of the measuring range of size exclusion chromatography coupled with light scattering (SEC/LALLS) to higher molar mass is presented. This method uses the fact that the light scattering signal can often be detected already at considerable smaller values of the elution volume (i. e. higher values of molar mass) than the concentration signal; furthermore, it takes into account the peak broadening effect in SEC. This procedure is tested for the case of a logarithmic normal distribution and a most probable distribution of molar mass. In the case of polypropylene with a logarithmic normal distribution (M̄w = 420 000, M̄n = 99 000), the range of molar mass covered by SEC/LALLS can be extended by a factor of about 10; with a most probable distribution (M̄n = 100 000), the attainable extension in molar mass assumes a factor of about 2.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 70
    Electronic Resource
    Electronic Resource
    Sorptionsverhalten von nativer und thermoplastischer stärke (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 45-63 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Because of the interest in their possible application as biologically degradable polymers, the isotherms of sorption of water vapour by native and thermoplastic starch were measured. The thermomechanical treatment of starch and the insertion of glycerol as softener lead to the disappearance of the hysteresis and to the transition from a Type II to Type III isotherm. A theory, describing the sorption behaviour of swellable sorbents, is introduced and its statements are discussed by means of experimental results. The theory allows to draw conclusions on the molecular behaviour during sorption.
    Notes: Es wurden Wasserdampf-Sorptionsisothermen von nativer und thermoplastischer Stärke gemessen. Die thermisch-mechanische Behandlung der Stärke und das Einfähren von Glyzerin als Weichmacher fährt zum Verschwinden der Hysterese und zum Übergang von der Typ II in eine Typ III Isotherme. Eine Theorie, welche das Sorptionsverhalten von quellbaren Sorbentien gut beschreibt, wird kurz eingeführt und anhand der experimentellen Daten ihre Aussagen diskutiert. Die vorgestellte Theorie erlaubt wegen der physikalischen Bedeutung der Parameter Rückschlüsse auf die molekularen Vorgänge während der Sorption. Die Motivation zur Untersuchung des Sorptionsverhaltens von thermoplastischer Stärke ist deren möglicher Einsatz als biologisch abbaubarer Kunststoff.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990105
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 71
    Electronic Resource
    Electronic Resource
    Etudes microlithographiques de résines négatives renfermant des unités tétrathiafulvalènes sensibles aux UV (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 15-31 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In order to solve the problem of polymer swelling which limits the resolution of negative resists, we have developed new resists where the swelling does not appear. For our study, we developed resists including polymers containing the tetrathiafulvalenylcarbonyloxymethyl radical and dibromotetrachloroethane. In order to study the influence of the nature of the radical bearing the tetrathiafulvalene unit in the polymers on the microlithographic properties of these resists, we also studied polymers containing the tetrathiafulvalenylphenoxymethyl radical. The resists have been tested under UV irradiation. The dependence of resist sensitivity on molecular weight is reported.
    Notes: Pour résoudre le phéomène de gonflement qui limite la résolution des résines microlithographiques classiques, nous nous sommes intéressés à de nouvelles résines avec lesquelles ce phénomène n'apparait pas. Nous avons retenu pour notre étude les résines R qui renferment en mélange un polymère porteur de radicaux tétrathiafulvalénylcarbonyloxyméthyles et le dibromotétrachloroéthane. Afin de voir l'influence de la nature du radical porteur de l'unité tétrathiafulvalène dans le polymtrè sur les propriétés microlithographiques des résines R, nous nous sommes également intéressés aux polymères renfermant des radicaux tétrathiafulvalénylphénoxymethyles. Les résines R ont été testées sous irradiation UV. Leurs sensibilités dépendent en outre de la valeur de la masse molaire du polymèr.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990103
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 72
    Electronic Resource
    Electronic Resource
    Photoinitiated surface grafting of synthetic fibers, IV. Applications of textile dyes onto surface-photografted synthetic fibers (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 33-44 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Hochfeste Polyethylen- (HSPE), Polypropylen- (PP), Polyethylenterephthalat-(PET) und Polyvinylalkohol-(PVA) Textilgarne wurden unter Anwendung des entwickelten kontinuierlichen Einweichprozesses mit verschiedenen funktionellen Monomeren, wie beispielsweise Acrylsäure (AA), Acrylamid (AM), Glycidylacrylat (GA) und 4-Vinylpyridin (VP) oberflächenfotogepfropft. Die Einfärbbarkeit der oberflächenmodifizierten Garne mit verschiedenen Textilfarbstoffen wurde untersucht. Im allgemeinen wurde eine erhebliche Verbesserung der Einfärbbarkeit beobachtet. Die Farbstoffaufnahme der oberflächenfotogepfropften Fasern wird von vielen Faktoren beeinflußt, beispielsweise von der Art der Faser, der Menge und den Eigenschaften des auf die Oberfläche der Fasern gepfropften funktionellen Monomeren, der Art des Textilfarbstoffs usw. Die Faseroberflächen, auf die ein Monomeres mit basischen Gruppen wie Acrylamid und 4-Vinylpyridin gepfropft wurde, lassen sich mit einem sauren Farbstoff wirkungsvoll einfärben. Dagegen läßt sich eine Faseroberfläche, auf die ein saures funktionelles Monomeres gepfropft wurde, leicht mit basischen Farbstoffen in tiefen Farbtönen einfärben. Die Farbstoffaufnahme steigt stetig mit zunehmender Pfropfung, in ESCA-Spectren als relative Intensitaten relevanter Linien gemessen. Die nicht gepfropften HSPE-, PP-, und PET-Fasern können mit bestimmten Farbstoffen in gewissem Maße eingefärbt werden. Bei der vorliegenden Arbeit erhöhte sich die Farbstoffaufnahme bei HSPE-Fasern, die mit GA gepfropft und mit dem Metallkomplexfarbstoff IO eingefärbt wurden, um das 3,4fache, bei PP-Fasern, die mit AA gepfropft und mit dem basischen Farbstoff MB eingefärbt wurden, um das 7,9fache, bei PET mit AM und dem Direktfarbstoff SL um das 6,1fache, bei PVA mit VP und dem sauren Farbstoff TE um das 15,3fache.
    Notes: High-strength polyethylene (HSPE), polypropylene (PP), poly(ethylene terephthalate) (PET), and poly(vinyl alcohol) (PVA) textile yarns have been surface-photografted with various functional monomers, such as acrylic acid (AA), acrylamide (AM), glycidyl acrylate (GA) and 4-vinyl pyridine (VP), by means of the continuous presoaking process developed. The dyeing of these surface-modified yarns with various textile dyes has been investigated. In general, considerable improvements of dyeability have been observed. The dye adsorption of the surface-photografted fibers is influenced by many factors, such as type of fiber, amount and properties of the functional monomer grafted on the surface of the fibers, type of textile dye, etc. The fibers surface-grafted with a monomer containing basic groups, such as acrylamide and 4-vinyl pyridine, are efficiently dyed with an acid dye. Conversely, a fiber surface-grafted with acidic functional monomer is easily dyed to deep shades with basic dyes. The dye adsorption increases monotonically with increasing grafting measured in ESCA spectra as relative intensities of relevant lines. The ungrafted HSPE, PP and PET fibers can be dyed to some extent with certain dyes. In the present work, the dye adsorption increased by 3.4 times for HSPE fiber grafted with GA and dyed with the metal complex dye IO, by 7.9 times for PP fiber grafted with AA and dyed with the basic dye MB, by 6.1 times for PET with AM and with the direct dye SL, and by about 15.3 times for PVA with VP and with the acid dye TE.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990104
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 73
    Electronic Resource
    Electronic Resource
    Study on the thermal behaviour of copolymers of acrylonitrile with halogenated carboxylic acids (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 65-74 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die thermische Stabilität von Acrylnitril-Copolymeren wurde mittels DSC untersucht, um den Einfluß von halogenierten Comonomeren mit Carboxygruppen auf die Stabilisierung von PAN zu präfen. Es wird gezeigt, daß die Aktivierungsenergie fär die Cyclisierung des AN/Bromacrylsäure(BrAA)-Copolymeren (86,2 kJ/mol) deutlich niedriger als die der Copolymeren mit Chloracrylsäure (ClAA, 158 kJ/mol), Acrylsäure (AA, 128 kJ/mol) und Itaconsäure (IA, 102 kJ/mol) ist. Das erlaubt eine Stabilisierung bei häherer Temperatur und eine Verkürzung der Stabilisierungszeit. ClAA ist BrAA bezäglich der Stabilisierungseffektivität nicht überlegen. Der Mechanismus der Cyclisierung von AN-Copolymeren mit halogenierten, carboxygruppenhaltigen Comonomeren wird diskutiert.
    Notes: The thermal stability of AN copolymers was studied by DSC technique in order to get information on the influence of comonomers containing halogenated carboxylic acid on the stabilization of PAN. It is shown that the activation energy of cyclization is reduced in the case of the copolymer with bromoacrylic acid (BrAA, 86.2 kJ/mol) compared with chloroacrylic acid (ClAA, 158 kJ/mol), acrylic acid (AA, 128 kJ/mol) and itaconic acid (IA, 102 kJ/mol). Copolymer AN/BrAA permits the stabilization at higher temperature than AN/IA and AN/AA, helping to shorten the stabilization time. It is proved that comonomer ClAA is not superior to BrAA in the effectiveness of thermal stabilization. The mechanism of the cyclization reaction of AN copolymer containing halogenated carboxylic acid is discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990106
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 74
    Electronic Resource
    Electronic Resource
    New unsymmetrical cycloaliphatic epoxypolyesterimides (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 199 (1992), S. 75-85 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurden neue unsymmetrische cycloaliphatische Bisepoxyderivative hergestellt. Die unterschiedliche Reaktionsfahigkeit der zwei Oxiranringe (cycloaliphatisch und glycidylisch) gegenüber Carbonsäure wurde untersucht, wobei eine normale und anomale Ringöffnung der Glycidylgruppen beobachtet wurde. Eine Homopolymerisation des Oxirans wurde ebenfalls beobachtet. Mit Hilfe der 13C-NMR-Spektroskopie wurde die Struktur der Polymeren ermittelt. Die neuen Epoxidharze zeigen gute thermische Eigenschaften.
    Notes: New bisepoxy unsymmetrical cycloaliphatic derivatives have been synthesized. The different reactivity of both oxirane rings (cycloaliphatic and glycidylic) has been tested against carboxylic acids giving rise to normal and abnormal opening to the glycidyl group. Homopolymerization reaction was also observed. Polymer structures were identified by 13C-NMR spectroscopy. Thermal analysis carried out allowed to confirm their good thermal properties.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051990107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 75
    Electronic Resource
    Electronic Resource
    Struktur und eigenschaften von simultanvernetzten bismaleimidmodifizierten novolak-epoxidharzen (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 119-131 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: N,N′-4,4′-Diphenylmethane-bismaleimide (BMI) was oligomerized in semisolid phenolnovolak epoxide-resin (EP) up to P̄n = 10. The morphology of the novolakcured EP-BMI solid resins is a two-phase structure. It consists in a homogeneous EP-BMI phase of an interpenetrating polymer network (IPN) and a BMI phase. The dynamic-mechanical properties depend on the overall weight fraction w2 of BMI and on the degree of oligomerization (P̄)n of BMI. The relative shear modulus of the EP-EMI resin in the rubber state shows that both phases can be coherent. The glass transition temperature (Tg) can be correlated with the degree of oligomerization of the BMI, for instance Δ P̄n ≡ 10 corresponds to Δ Tg ≡ 35 K and Δ wx2 ≡ 0,25 (weight fraction of BMI in the homogeneous EP-BMI phase). Surprisingly, the breaking strength remains constant.
    Notes: N,N′-4,4′-Diphenylmethan-bismaleimid (BMI) wurde in halbfesten Phenolnovolak-Epoxidharzen (EP) bis P̄, = 10 oligomerisiert. Die novolakgehärteten EP-BMI-Festharze bilden eine Zweiphasenstruktur, bestehend aus einer EP-BMI-Mischphase der beiden sich durchdringenden Netzwerke (interpenetrating polymer network, IPN) und einer BMI-Phase. Die dynamisch-mechanischen Eigenschaften hängen vom Gesamt-BMI-Anteil w2 und vom Oligomerisierungsgrad P̄n des BMI ab. Der relative Schubmodul des EP-BMI-Harzes im kautschukelastischen Zustand zeigt, daß beide Phasen kohärent sein können. Die Glastemperatur Tg korreliert mit dem Oligomerisierungsgrad, z. B. entspricht ΔPn ≡ 10 einem ΔTg ≡ 35 K und einem BMI-Anteil Δ wx2 ≡ 0,25 in der Mischphase. Die Bruchzahigkeit bleibt unerwartet konstant.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 76
    Electronic Resource
    Electronic Resource
    Studies on new non-shrinking, thermally stable, aralditeRegistered trade mark of CIBA-GEIGY AG.-type photopolymers with pendent arylacryloyl groups III. Photopolymers with pendent cinnamic acid ester and furan acrylic ester groups and their reactions with low molar mass modifiersPart II: Angew. Makromol. Chem. 191 (1991) 191. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 103-117 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Handelsübliche Araldit™-Polymere wurden mit Zimtsäure- bzw. Furanacrylsäurechlorid modifiziert und über [2 + 2]-Cycloaddition photochemisch vernetzt. Die Glasübergangstemperaturen der entstandenen Polymeren betragen bis zu 130°C bei Dielektrizitätskonstanten von ∊r = 3.0. Daher können diese Polymeren in Mehrlagenmikroverdrahtungen verwendet werden. Zahlreiche wohldefinierte, multifunktionelle Modifikatoren wurden synthetisiert und deren Einfluß auf die Polymerisation und die Eigenschaften der Araldit™-Polymeren eingehend untersucht.
    Notes: Commercially available Araldite™-type polymers have been modified with cinnamic and furan acrylic acid chlorides. The polymers were photochemically crosslinked via a [2 + 2] cycloaddition. The resulting polymers show glass transition temperatures up to 130°C and dielectrical constants of ∊r = 3.0. Therefore, these polymers can be applied as permanent resists in multi-layered wiring structures. Numerous well-defined multifunctional modifiers have been synthesized. The effect of those modifiers on the polymerization and properties of the araldite-type polymers has been studied in some detail.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 77
    Electronic Resource
    Electronic Resource
    Photovernetzung von siliconen, 8. Netzwerkcharakterisierung photovernetzter siliconacrylate7. Mitteilung vgl.1. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 200 (1992), S. 61-76 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The photoinduced free radical crosslinking of silicone containing pendent acrylate or methacrylate groups was investigated by swelling measurements. A modified swelling test was applied to observe the network formation as a function of several parameters. The results show that the network density of the crosslinked polymers is a function of the light intensity, the exposure time, the acrylate content, the molecular weight of the uncrosslinked silicone acrylate and also of the length of the spacer group between the acrylate unit and the silicone backbone. Oxygen has only an influence on the polymerization kinetics, but it does not influence the network density.From the δB, -values of crosslinked silicone acrylates and silicone containing vinyl groups it is possible to analyze the structure of the network as a function of the olefinic group. The χ-parameters of both silicone types are of the same magnitude in the same concentration range.Kinetics investigations demonstrate that the order of the network formation is nearly unity. This result agrees with the polymerization kinetics.By means of swelling measurements it is also possible to study the influence of hydrogen siloxane additives as hydrogen transfer reagents.
    Notes: Die photoinduzierte radikalische Vernetzung von Siliconacrylaten bzw. -methacrylaten wurde mit Hilfe von Quellungsmessungen untersucht, wobei ein modifizierter Quellungstest erlaubt, die Netzwerkbildung als Funktion verschiedener Parameter zu betrachten. Die Ergebnisse zeigen, daß die Netzwerkdichte eine Funktion der Lichtintensität, der Bestrahlungszeit, des Acrylatgehalts, der Molmasse des unvernetzten Silicons und auch der Länge der Spacergruppe zwischen Acrylateinheit und dem Siliconrückgrat ist. Sauerstoff besitzt dagegen nur einen Einfluß auf die Polymerisationskinetik, nicht aber auf die Netzwerkdichte.Aus dem Vergleich der δB, -Werte der vernetzten Siliconacrylate und der vernetzten Vinylsilicone kann geschlossen werden, daß die Netzwerkstruktur auch vom Typ der olefinischen Gruppen abhängt. Die χ-Parameter besitzen jedoch im gleichen Konzentrationsbereich die gleiche Größe.Kinetische Untersuchungen zeigen, daß die Netzwerkbildung nach einem Zeitgesetz erster Ordnung verläuft. Dieses Ergebnis steht im Einklang mit der Polymerisationskinetik.Mit Hilfe der Quellexperimente ist es auch moglich, den Einfluß von H-Siloxanzusätzen als Wasserstoffüberträger zu untersuchen.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.052000106
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 78
    Electronic Resource
    Electronic Resource
    Synthese und charakterisierung von butadien-divinylbenzol-copolymeren (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 133-148 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The copolymerization of butadiene with a technical divinylbenzene fraction was investigated to study the modification of cis-1,4 polybutadiene. Beside the Ziegler-Natta-catalyst nickeloctanoate/bortrifluoride/aluminiumtriethyl, another catalytic system consisting of nickeloctanoate/titaniumtetrachloride/aluminiumtriethyl was used, which allows to polymerize more divinylbenzene because of its higher activity toward vinylaromates. With the help of spectroscopical, pyrolysis-gaschromatographical and thermoanalytical methods one can obtain relations between glass-, crystallization- and melting temperature and the microstructure of the polymer. It can be shown that not only the divinylbenzene but also the trans-1,4- and the 1,2-vinyl units are statistically distributed in the polymer. By this, beside the pyrolysis-gaschromatography, particularly the differential scanning calorimetry is a useful tool to characterize the structure of partially crosslinked polymers obtained from polymerization of technical fractions.
    Notes: Im Rahmen von Arbeiten zur Modifizierung des cis-1,6Polybutadiens wurde die Copolymerisation von Butadien und einer Divinylbenzolfraktion, insbesondere der Bereich mit kleinen Divinylbenzolgehalten, untersucht. Neben dem Ziegler-Natta-Katalysator Nickeloctanoat/Bortrifluoridetherat/Aluminiumtriethyl kam auch ein Nickeloctanoat/Titantetrachlorid/Aluminiumtriethyl-System zur Anwendung, welches es durch seine höhere Aktivität gegenüber Vinylaromaten ermöglicht, großere Mengen der Divinylbenzolfraktion zu polymerisieren. Durch die Anwendung von spektroskopischen, pyrolysegaschromatographischen und thermoanalytischen Charakterisierungsmethoden können Beziehungen zwischen den erhaltenen Glas-, Kristallisations- und Schmelztemperaturen und der Mikrostruktur des Polymeren hergestellt werden. Es zeigt sich, daß sowohl das Divinylbenzol als auch die trans-1,4 bzw. die 1,2-Vinyl-Einheiten statistisch in das Polymere eingebaut werden. Damit eignet sich neben der Pyrolysegaschromatographie besonders die Differential Scanning Calorimetry als eine einfache Methode zur Charakterisierung der Struktur von aus technischen Fraktionen erhaltenen und teilweise vernetzten Polymerproben.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940111
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 79
    Electronic Resource
    Electronic Resource
    Effects of composition and plastifier on the light scattering of polymer glasses and properties of polymeric optical fibers made from styrene-methyl methacrylate copolymers (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 149-158 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Optisch hochreine Gläser wurden aus Polystyrol (PS), Polymethylmethacrylat (PMMA) und statistischen Styrol-Methylmethacrylat-Copolymeren (S-MMA) hergestellt. Die an diesen Gläsern gemessene Lichtstreuung hängt von der chemischen Zusammensetzung des Polymeren und dem Brechungsindex des zugesetzten Weichmachers ab. Ein isorefraktiver Weichmacher verringert die Streuwerte der S-MMA-Copolymeren, hat aber keinen signifikanten Einfluß auf das Streuverhalten von PMMA. Ein Weichmacher mit einem vom Polymeren verschiedenen Brechungsindex verschlechtert die Streuwerte in allen untersuchten Fällen. Es wird gezeigt, daß ein isorefraktiver Weichmacher die Dämpfungseigenschaften von aus dem Copolymeren S-MMA 2/1 gezogenen polymeren Lichtleitern verbessert.
    Notes: High optical purity polystyrene (PS), poly(methyl methacrylate) (PMMA) and styrene-methyl methacrylate statistical copolymers (S-MMA) were prepared. Light scattering measured on polymeric glasses depends on the chemical composition of the polymer and on the refractive index of the plastifier added. An isorefractive plastifier reduces considerably the scattering values for the copolymers S-MMA, while having no significant effect on the scattering of PMMA. A plastifier with a refractive index different from that of the polymer raises distinctly the light scattering values in all cases. It has been shown that the isorefractive plastifier has a favourable effect on attenuation loss of polymeric optical fibers (POF) obtained from the copolymer S-MMA 2/1.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 80
    Electronic Resource
    Electronic Resource
    Morphologiebildungs- und dispergiermechanismen bei der herstellung und verarbeitung von polymer-blends aus acrylnitril-butadien-styrol-(ABS)- bzw. Styrol-acrylnitril-(SAN)-copolymerisaten mit thermoplastischem polyurethan (TPU) (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 159-178 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: ABS/TPU- und SAN/TPU-blends were investigated on the basis of the analysis of viscoelastic behaviour of the components for characterization of the formation of morphology in melt mixing processes. Blends mixed in a laboratory kneeder and extruded from a high pressure capillary viscosimeter under definite conditions were characterized concerning their phase morphology by transmission electron microscopy. The types of morphology predicted by the help of rheological analysis could be confirmed by electron micrographs and quantitative analysis of morphology. It becomes evident, that the ratio of viscosity of the components has the primary influence on the formation of morphology in the blends. But also thermomechanically induced molecular destruction processes and thermodynamic interactions as well as connecting crystallisation conditions for the TPU-phase are not negligible with regard to resulting phase morphology.
    Notes: An ABS/TPU- bzw. SAN/TPU-Blends wurden Untersuchungen zur Morphologiebildung beim Schmelzemischen auf der Basis der Analyse des viskoelastischen Verhaltens der Komponenten angestellt. Unter definierten Bedingungen im Laborkneter gemischte und unter definierten Bedingungen mittels Hochdruckkapillarviskosimeter extrudierte Blendproben wurden hinsichtlich ihrer Phasenmorphologie elektronenmikroskopisch charakterisiert. Die mittels der rheologischen Analyse prognostizierten Morphologietypen und Morphologiebildungsmechanismen konnten anhand der elektronenmikroskopischen Aufnahmen und der quantitativen Morphologieanalyse bestätigt werden. Es zeigte sich, daß das Viskositätsverhältnis der Komponenten primären Einfluß auf die Morphologiebildung ausübt. Darüber hinaus sind auch thermomechanisch induzierte molekulare Abbauvorgänge und thermodynamische Wechselwirkungen sowie damit im Zusammenhang stehende Kristallisationsbedingungen für die TPU-Phase hinsichtlich der resultierenden Phasenmorphologie nicht zu vernachlässigen.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940113
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 81
    Electronic Resource
    Electronic Resource
    On the effect of water on the durability of PP and PC/acrylic adhesive joints (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 194 (1992), S. 189-200 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Stabilität von Verbindungen von Polypropylen (PP) und Polycarbonat (PC) mit einem Acryl-Kleber wurde mit einer thermodynamischen, auf der Messung von Oberflächenspannungen beruhenden Methode bestimmt.Die Charakterisierung der Oberflächen zeigte, daß eine Plasmabehandlung die Bildung einer sauerstoffreichen Oberflächenschicht bewirkt. Eine Lagerung in Wasser führt bei PP zu keiner Veränderung dieser Schicht, während bei PC niedermolekulare, oxidierte Verbindungen ausgewaschen werden.Sowohl unbehandelte als auch mit Plasma behandelte PP-Verbindungen wiesen bei Lagerung in Wasser eine annehmbare Stabilität auf. Zwar wurde eine geringe Abnahme der Scherfestigkeit gemessen, aber unbehandeltes und plasmabehandeltes PP zeigten weiterhin adhäsives bzw. kohäsives Bruchverhalten.Im Falle von PC blieben nur die aus unbehandeltem PC hergestellten Verbindungen ausreichend stabil, während die aus plasmabehandeltem PC hergestellten Verbindungen stark abgebaut wurden. Bei den letzteren wanderte der Versagensort an die Polymer/Kleber-Grenzfläche, was auf die Ausbildung einer sehr hydrophilen, niedermolekularen Schicht zurückgeführt wird.
    Notes: The stability of PP and PC/acrylic adhesive joints has been assessed using a thermodynamic method based on surface tension components.Surface characterization showed that plasma treatment induces the formation of an oxygen-rich layer on treated surfaces. In the case of PP this layer does not change its composition upon immersion in water, while for PC leaching of oxidized species with low molecular weight was observed.Both untreated and plasma treated PP joints showed reasonable stability against immersion in water. A small reduction of shear strength was observed, but the fracture remained adhesive for untreated PP and cohesive for plasma treated PP.In the case of PC, only joints made from untreated PC showed fair sensitivity against immersion in water, while those made from plasma treated specimens degraded dramatically. In the latter case the locus of failure moved to the adhesive/adherend interface, the presence of a very hydrophilic, low molecular weight layer being suggested as responsible for this behavior.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051940115
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 82
    Electronic Resource
    Electronic Resource
    Etude de l'oxydation de polystyrènes chlorométhylés renfermant de nouveaux radicaux tétrathiafulvalénylcarbonyloxyméthyles (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 89-106 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: The chloromethylated polystyrenes bearing tetrathiafulvalenylcarbonyloxymethyl groups can be oxidized. We have shown that ion radical salts are obtained from these polymers and carbon tetrabromide after irradiation with UV light. Charge transfer complexes were prepared by mixing these polymers and 2,3-dichloro-5,6-dicyanobenzoquinone. The possible presence of sulfoxides as a result of oxidation of some tetrathiafulvalene units could explain the difficulties we have observed to filter solutions of these polymers.
    Notes: Les polystyrènes chlorométhylés renfermant des radicaux tétrathiafulvalénylcarbonyloxyméthyles peuvent être oxydés. Ainsi la formation de sels d'ions radicaux obtenus à partir de ces polymères et de tétrabromure de carbone, irradiés sous UV, a été mise en évidence. Des complexes de transfert de charge ont été préparés en mettant en présence ces polymères et de la 2,3-dichloro-5,6-dicyanobenzoquinone. La présence de sulfoxydes non décelés et résultant de l'oxydation de certaines unités de tetrathiafulvalène contenus dans ces polymères pourrait expliquer les problèmes rencontrés lors de la filtration de leurs solutions.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 83
    Electronic Resource
    Electronic Resource
    Metal complexation of poly[1-(2-hydroxyethyl)aziridine-co-2-methyl-2-oxazoline]Systematic name: Poly[(acetylimino)ethylene-co-(2-hydroxyethyleneimino)ethylene]. in aqueous solutionDedicated to Prof. Esen A. Bekturov on the occasion of his 60th birthday (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 107-115 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Metallkomplexierung von wasserloslichem Poly[1-(2-hydroxyethyl)aziridin-co-2-methyl-2-oxazolin] mit Co(II), Zn(II), Ni(II), Cu(II), Cr(III), Fe(III), Cd(II), Pb(II) und Sr(II)-Ionen wurde in wäßriger Phase mit der Methode der Liquid-Phase Polymer-Based Retention (LPR) untersucht. Die Studie zeigt, daß alle Metallionen, außer Co(II) und Zn(II), bei pH 5 komplexiert wurden. Im Gegensatz zu Sr(II), das nur eine schwache Wechselwirkung in einem pH-Bereich von 3 bis 7 zeigte, wurden bei pH 7 94% Co(II) und 88% Zn(II) retentiert. Bei pH 3 zeigten nur Cu(II) und Cr(III) eine Wechselwirkung mit dem Polymeren, wobei die Retentionswerte 76% für Cu(II) und 52% für Cr(III) betrugen. Viskositätsmessungen des Copolymeren in Gegenwart von Metallionen wurden bei verschiedenen pH-Werten durchgeführt.
    Notes: The metal complexation of water-soluble poly[1-(2-hydroxyethyl)aziridine-co-2-methyl-2-oxazoline] with Co(II), Zn(II), Ni(II), Cu(II), Cr(III), Fe(III), Cd(II), Pb(II), and Sr(II) ions was investigated in aqueous phase using Liquid-Phase Polymer-Based Retention (LPR). The study shows that all metal ions are complexed at pH 5, except Co(II) and Zn(II). In contrast to Sr(II), which showed only a slight interaction over a pH range of 3 to 7, 94% of Co(II) and 88% of Zn(II) were retained at pH 7. At pH 3, only Cu(II) and Cr(III) ions interacted with the copolymer with retention values of 76% for Cu(II) and 52% for Cr(III). Viscosimetric measurements of the copolymer were performed in the presence of metal ions at different pH values.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 84
    Electronic Resource
    Electronic Resource
    Preparation and uranyl ion adsorptivity of macroreticular chelating resins containing phosphono groups (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 117-129 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Makroretikulare Copolymerperlen wurden durch Suspensionspolymerisation von Styrol, Bis(2-chlorethyl)vinylphosphonat (CEVP) und Divinylbenzol (DVB) in Gegenwart von Toluol als Verdünnungsmittel hergestellt. Die auf der Perlenoberfläche vorhandenen 2-Chlorethylphosphonat-Gruppen wurden durch Hydrolyse mit verdünnter Salpetersäure in Phosphon-Gruppen transformiert. Für die Einführung zusätzlicher Phosphon-Gruppen wurden die Copolymeren in Gegenwart von Aluminiumchlorid-Katalysator mit Phosphortrichlorid phosphoryliert, und die dabei entstandenen Dichlorphosphingruppen wurden mit verdünnter Salpetersäure verseift und oxidiert. Die Untersuchungen zur Chelatbildung der Copolymeren mit Metallionen zeigten, daß sie ein hohes Adsorptionsvermögen für Uranylionen und gute Stabilität gegen Chemikalien wie Säuren und Alkalien aufweisen. Es wurde auch gefunden, daß die Phosphongruppen enthaltenden Copolymeren recht effektive Adsorbentien für eine Vielzahl von Schwermetalionen wie Pb2+, Hg2+, Cd2+ und Cu2+ sind.
    Notes: Macroreticular copolymer beads were prepared by suspension polymerization of styrene, bis(2-chloroethyl) vinyl phosphonate (CEVP) and divinylbenzene (DVB) in the presence of toluene as diluent. The bis(2-chloroethyl) phosphonate groups on the bead surface were converted into phosphono groups by hydrolysis with dilute nitric acid. For the additional enrichment of phosphono groups, the copolymers were phosphorylated at the phenyl rings with phosphorus trichloride in the presence of aluminum chloride and hydrolyzed and oxidized with dilute nitrics acid. The investigations on metal ion chelation characteristics of the bead-type copolymers revealed that they have very high adsorptivity toward uranyl ions and good chemical resistance under acidic and alkaline media. It was also found that the phosphono group-containing copolymer beads are effective adsorbents for other heavy metal ions such as Pb2+, Hg2+, Cd2+, and Cu2+.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970110
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 85
    Electronic Resource
    Electronic Resource
    Isocyanate reactions in and with N,N-dimethylformamide (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 131-139 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Lösungen von Phenylisocyanat (I) in DMF wurden sowohl bei verschiedenen Temperaturen als auch in Gegenwart von Polyurethankatalysatoren und/oder 1,3-Diphenylharnstoff (II) gelagert. Die Reaktionsprodukte wurden mit Hilfe der HPLC quantifiziert. Neben der Hydrolyse von I zu II wird bei 20°C eine signifikante Reaktion von I mit II zu 1,3,5-Triphenylbiuret (III) beobachtet.Oberhalb 60°C reagiert I mit dem Lösungsmittel zu N,N-Dimethyl-N′-phenylformamidin (V). In DMF dissoziiert III bereits bei Temperaturen 〉 40°C zu I und II.
    Notes: Solutions of phenylisocyanate (I) in DMF were stored at different temperatures in the presence of both polyurethane catalysts and 1,3-diphenylurea (II). The reaction products were determined by HPLC. Beside the hydrolysis of I to II, a significant reaction of I with II to 1,3,5-triphenylbiuret (III) was observed at 20°C. Above 60°C, I reacted with the solvent to form N,N-dimethyl-N′-phenylformamidine (V). In DMF, III dissociated to I and II already at temperatures 〉40°C.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970111
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 86
    Electronic Resource
    Electronic Resource
    Glass fiber-reinforced epoxy composites (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 141-147 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Glasfaserverstärkte Epoxidlaminate wurden aus den Matrixharzen Tetraglycidyldiaminodiphenylmethan (TGDDM) und Tetraglycidylbis(o-toluidino)methan (TGMBT) unter Verwendung von Härtern wie 4,4′-Diaminodiphenylmethan (DDM), 4,4′-Diaminodiphenylsulfon (DDS) und Diethylentriamin (DETA) hergestellt. Die mechanischen und dielektrischen Eigenschaften sowie die Chemikalienresistenz der Laminate wurden untersucht. Die Zugabe eines Epoxyverstärkers (20 Gew.-%, bezogen auf das Matrixharz) ergab eine Verbesserung der mechanischen Eigenschaften.
    Notes: Glass fiber-reinforced epoxy composites were prepared from the matrix resins tetraglycidyl diaminodiphenylmethaneSystematic name: N,N,N′,N′-Tetrakis(2,3-epoxypropyl)-4,4′-diaminodiphenylmethane. (TGDDM) and tetraglycidyl bis(o-toluidino)-methaneSystematic name: N,N,N′,N′-Tetrakis(2,3-epoxypropyl)-4,4′-bis(o-toluidino)methane. (TGMBT) using various amines like 4,4′-diaminodiphenylmethane (DDM), 4,4′-diaminodiphenylsulfone (DDS) and diethylene triamine (DETA) as curing agents. The fabricated laminates were evaluated for their mechanical and dielectrical properties and chemical resistance. The composites prepared using an epoxy fortifier (20 phr) showed significant improvement in the mechanical properties.
    Additional Material: 3 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970112
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 87
    Electronic Resource
    Electronic Resource
    Zur vernetzung dünner polymerschichten durch photolyse aromatischer bisazide (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 149-157 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: In 1 μm layers of different polymers containing 10 wt.-% 4,4′-diazidobiphenyl, the network formation under the influence of UV-irradiation was estimated by solvent treatment. The high activity of poly(glycidyl methacrylate) against the nitrenes formed is caused by its 1,2-epoxypropyl groups. As confirmed by IR-spectroscopy, the oxirane ring itself is not affected; NMR spectroscopic results indicate reactions between nitrenes and exocyclic CH2-groups.
    Notes: Die UV-Vernetzung in 1 μm-Schichten aus Polymeren verschiedener Konstitution, die 10 Gew.-% 4,4′-Diazidobiphenyl (DABP) enthalten, wird zeitabhängig anhand der reduzierten Schichtdicke nach Lösungsmittelbehandlung verglichen. Für die hohe Vernetzungsgeschwindigkeit von Polyglycidylmethacrylat mit den photolytisch gebildeten Bisnitrenen sind die 1,2-Epoxypropylgruppen verantwortlich. Der Oxiranring bleibt erhalten (IR-Spektroskopie). Wahrscheinlicher Reaktionsort ist die exocyclische CH2-Gruppe (13C-Festkörper-NMR-Spektroskopie).
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970113
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 88
    Electronic Resource
    Electronic Resource
    Investigation of synthesis and light stability of polymeric azo dyes. I. Polymeric urethane-azo dyes (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 159-173 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Ausgehend von 10 unterschiedlich 4′-substituierten 4-[N,N-dihydroxyethyl]aminoazobenzolen wurden durch Umsetzung mit Hexamethylendiisocyanat polymere Azofarbstoffe (M̄n 4200-10200) synthetisiert und die Substituentenabhängigkeit der spektralen Eigenschaften, der Redoxpotentiale und des Ausbleichverhaltens mit entsprechenden monomeren und dimeren Modellverbindungen verglichen. Die Ausbleichung erfolgt durch einen photooxidativen Prozeß. In der Reihenfolge monomerer 〉 dimerer 〉 polymerer Azofarbstoff sinkt die Lichtstabilität durch die Verringerung thermischer Desaktivierungsprozesse sowie durch einen möglichen intramolekularen Energietransfer.
    Notes: Starting from 10 different 4′-substituted 4-[N,N-dihydroxyethyl]aminoazobenzenes, polymeric urethane-azo dyes (M̄n 42000-10200) were prepared by reacting those with hexamethylene diisocyanate. The dependence of spectral properties, redox potentials and photofading behaviour on the kind of substitutents was determined and then compared with corresponding monomer and dimer model compounds. Photofading is caused by a photooxidative process. In the sequence of monomeric 〉 dimeric 〉 polymeric azo dyes, light stability decreases due to a diminution in thermal disactivation processes and in a possible intramolecular energy transfer.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970114
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 89
    Electronic Resource
    Electronic Resource
    Announcements (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 207-208 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970118
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 90
    Electronic Resource
    Electronic Resource
    Preparation of porous bead cellulose with technical grain size (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 201-206 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Bead cellulose, particle diameter 0.1 - 2.7 mm, was prepared from dispersions of viscose in chlorobenzene by applying the thermal sol-gel transition. Technical viscose containing modifiers Berol Visco 32, Berol Glyco 1540 and Kordamin V was used. The size of cellulose beads can be controlled by means of the amount of oleic acid in the dispersion medium. The optimal result was reached at 5 - 6 mg oleic acid in 90 ml chlorobenzene.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970117
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 91
    Electronic Resource
    Electronic Resource
    Effect of electron radiation on dyed PET and PA 66 substrates (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 185-199 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: PET- und PA 66-Textilien wurden unter normalen Bedingungen mit verschiedenen Dispersionsfarbstoffen gefärbt. Die gefärbten Textilien wurden mit 180 kV Elektronenstrahlung bestrahlt. Es wurde beobachtet, daß, verglichen mit den unbestrahlten Materialien, zunehmende Strahlungsdosen zu einer Zunahme des Gesamtfarbabstandes dE führten. Diese Farbunterschiede werden hauptsächlich von zwei Reaktionen verursacht: Erstens von der reversiblen Bildung von Farbstoffradikalen, die (an Luft) wieder zu den Ausgangsfarbstoffen reoxidiert werden können und zweitens durch die irreversible Reaktion von Farbstoffmolekülen mit dem Faserpolymeren. Die zweite Reaktion ruft eine permanente Farbänderung des Textils hervor, die bei entsprechenden Bestrahlungsbedingungen klein gehalten werden kann. Die Entscheidung, ob diese Veränderung toleriert werden kann, hängt von der weiteren Verwendung des Textils ab.
    Notes: PET and PA 66 fabrics were dyed with different disperse dyes under regular conditions. The dyed fabrics were irradiated with 180 kV electron radiation. It was observed that increasing radiation doses led to increasing total color differences dE if compared to the unirradiated materials.These color differences are mainly caused by two types of reactions. First by the reversible formation of dye radicals, which can be reoxidized (in air) to the original dye molecules, and second by the irreversible reaction of dye molecules with the fiber polymer. The latter reaction causes a permanent change of the color of the fabric, which can be kept low with the proper irradiation conditions. The decision whether or not this change can be tolerated depends on the further use of the textile.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970116
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 92
    Electronic Resource
    Electronic Resource
    Investigation of synthesis and light stability of polymeric azo dyes. II. Polymeric acrylate-azo dyesPart I cf.3. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 197 (1992), S. 175-184 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Unterschiedlich 4′-substituierte 4-[N-Ethyl-N-(2-acryloyloxy)ethyl]aminoazobenzole dienten als Ausgangsmonomere für Homopolymerisationen und Copolymerisationen mit Styrol und Methylmethacrylat. Die Photobleichung der erhaltenen polymeren Azofarbstoffe (M̄ 4200-9000) wurde mittels einer Xenotest-Apparatur untersucht und mit den entsprechenden Monomeren verglichen. Es wird angenommen, daß die in der Reihenfolge monomerer  -  copolymerisierter  -  homopolymerisierter Azofarbstoff sinkende Photostabilität durch zunehmenden Energietransfer in der Matrix verursacht wird.
    Notes: Different 4′-substituted 4-[N-ethyl-N-(2-acryloyloxy)ethyl]aminoazobenzenes were used as starting monomers for homopolymerization and copolymerization reactions with styrene and methyl methacrylate. The photofading behaviour of the obtained polymeric azo dyes (M̄n 4200 - 9000) was investigated by means of a Xenotest device and compared with that of the corresponding monomers. The decreased photostability in the order monomer  -  copolymer  -  homopolymer was assumed to be caused by an increasing energy transfer in the matrix.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051970115
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 93
    Electronic Resource
    Electronic Resource
    Synthesis and exchange reactions of polymers containing reactive phthalimide groups (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 31-38 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: N-Methacryloyloxyphthalimid und N-Methacryloyloxytetrabromphthalimid wurden durch Reaktion von Methacrylsäure bzw. Methacryloylchlorid mit N-Hydroxyphthalimid bzw. N-Hydroxytetrabromphthalimid hergestellt und homopolymerisiert. Die Austauschreaktionen der Polymeren mit Hydroxy- und Amin-Verbindungen wurden untersucht.
    Notes: N-Methacryloyloxyphthalimide (NMPI) and N-methacryloyloxytetrabromophthalimide (NMTPI) were prepared by the reaction of methacrylic acid with N-hydroxy-phthalimide and N-hydroxytetrabromophthalimide, respectively. The resulting monomers were polymerized. The reactions of the resulting polymers with hydroxy and amine compounds have been studied.
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980103
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 94
    Electronic Resource
    Electronic Resource
    Crystallization of poly(aryl ether ketones). 2. Double peak melting behavior of PEEKK (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 15-29 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Das Tempern von Poly(etheretherketonketon) zwischen Glasübergangs- und Schmelztemperatur erzeugt normalerweise einen ausgeprägten Doppelschmelzpeak in der DSC-Kurve dieses Polymeren. Die eingehende Untersuchung dieses Doppelschmelzverhaltens in Abhängigkeit von Temperbedingungen und experimentellen Parametern zeigt, daß die Kristallisation als ein in zwei Stufen mit unterschiedlichen Zeitskalen ablaufender Prozeß beschrieben werden kann. Eine Rekristallisation als Ursache des Doppelpeaks kann widerlegt werden.
    Notes: Annealing poly(ether ether ketone ketone) (PEEKK) between glass transition and melting temperature generally results in a pronounced double peak melting behavior as obtained by DSC. Detailed investigations of the dependence of this double peak melting behavior on annealing conditions and experimental parameters clearly reveal that the crystallization can be described by a two-stage process occurring on different time scales. A recrystallization model as origin for the double peak melting curves can be disproved.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 95
    Electronic Resource
    Electronic Resource
    Hydroformylation of nitrile rubber and its characterization (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 1-14 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Nitrilkautschuk (NBR) wurde mit trans-Chlorcarbonylbis(tripheny1phosphin)rhodium(1) [trans-RhCI(CO)(PPh3)2] und Hydridocarbonyltris(triphenylphosphin)rhodium(1) [RhH (CO)(PPh3)3] als Katalysatoren in homogener Lösung selektiv hydroformyliert. Bei der Hydroformylierung von NBR mit 40 mol-% Acrylnitril bei 363 K, 5,6 MPa Gasdruck (CO:H2 = 1:1) und mit 0,43 mmol Katalysator werden mit trans-RhCl(CO)(PPh3)2 25% und mit RhH (CO)(PPh3)3 30% Umsatz erreicht. Beide Reaktionen sind bezüglich der Olefin- und Katalysatorkonzentration pseudo-erster Ordnung. Mit RhH (CO)(PPh3)3 wird eine höhere Reaktionsgeschwindigkeit erhalten. Die IR- und NMR-spektroskopische Charakterisierung der Produkte zeigt, daß sowohl die 1,4- als auch die 1,2-Butadieneinheiten hydroformyliert werden. Mit steigendem Aldehydgruppengehalt sinkt die Grenzviskositatszahl [q] und steigt die Glastemperatur. Bei hoheren Hydroformylierungsgraden wird Gelbildung beobachtet.
    Notes: Selective homogeneous catalytic hydroformylation of nitrile rubber (NBR) has been carried out in presence of trans-chlorocarbonylbis(triphenylphosphine)rhodium(I) [trans-RhCl(CO)(PPh3)3] and hydridocarbonyltris(triphenylphosphine)rhodium(I) [RhH(CO)(PPh3)3] as catalysts. At 363 K, under 5.6 MPa pressure (CO:H2 = 1:1) in presence of 0.43 mmol/l catalyst, the amount of hydroformylation is 25% in the case of trans-RhCl(CO)(PPh3)2 and 30% in the case of RhH (CO)(PPh3)3 for NBR with 40 mol-% acrylonitrile. Reaction kinetics suggest that both the reactions are pseudo-first order with respect to olefinic substrate and catalyst concentration. The rate of the reaction is higher in the case of RhH(CO)(PPh3)3. The characterization of the products by IR and NMR spectroscopy shows the formation of internal aldehyde groups from 1,4-units and terminal branched aldehyde groups from 1,2-units of the copolymer. Measurements on intrinsic viscosity [η] and glass transition temperature (Tg) suggest a decrease in [η] and an increase in Tg with the degree of formyl functionalization. Gel formation has been observed at higher degree of hydroformylation.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980101
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 96
    Electronic Resource
    Electronic Resource
    Bonding of rhenium(V) to diethylenetriaminepentaacetate functional groups of a polymethacrylate support (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 61-70 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Die Komplexierung von Rhenium in einer polymeren Methacrylat-Matrix mit funktionellen Diethylentriaminpentaessigsäure-Gruppen wurde untersucht. Es werden diamagnetische Komplexe gebildet, wobei Rhenium in einer heterogenen Koordinationssphäre gebunden wird, bestehend aus Chlor und mehrfach gebundenem Sauerstoffsowie Carboxygruppen, die als einzige funktionelle Gruppe des polymeren Trägers als Ligand des Metallatoms wirken. Die Rhenium-Komplexe wurden durch IR- und UV-VIS-Spektroskopie sowie durch Messung ihrer magnetischen Momente charakterisiert.
    Notes: The bonding of rhenium to diethylenetriaminepentaacetic acid functional groups of a polymeric methacrylate matrix was studied. Diamagnetic complexes were formed of Re(V) with the heterogeneous coordination sphere containing atoms of chlorine and multiply bonded oxygen in addition to carboxylic groups, which are the only groups of the polymeric support functioning as ligands in the bonding to the metal. The rhenium complexes were examined by IR and UV-VIS spectroscopy and by magnetic moment measurements.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980106
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 97
    Electronic Resource
    Electronic Resource
    m-Bromophenolic epoxy resins for electronic packaging (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 51-60 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Meta-halogenierte Phenole sind bekanntermaßen chemisch und thermisch stabiler als ihre ortho- oder para-halogenierten Analoga. Die Verwendung eines reaktiven Zwischenproduktes, hergestellt durch Bromierung von 2,4,6-Trimethylphenol, als Alkylierungsmittel für den Einbau der stabilen m-Bromphenol-Einheit in verschiedene organische Substanzen und Polymere wird beschrieben. Bei der Anwendung als Verkapselungsmaterialien für elektronische Bauteile zeigten sich Epoxid-Derivate von Novolaken mit m-Bromphenol-Einheiten bezüglich hydrolytischer und thermischer Stabilität den konventionellen Tetrabrombisphenol-A-Epoxidharzen, die ortho- und para-bromiert sind, überlegen. Die m-Bromphenolgruppe verbessert die Bauteilzuverlässigkeit bei gleichzeitiger Erfüllung der Anforderungen an das Brandverhalten.
    Notes: Meta-halogenated phenols are generally known to be more chemically and thermally stable than their ortho- or para-halogenated counterparts. A reactive intermediate, produced by the bromination of 2,4,6-trimethylphenol is being used as an alkylating agent to incorporate this stable m-bromophenol moiety into varieties of organic compounds and polymers. In electronic encapsulation applications, epoxy derivatives of novolacs containing m-bromophenol have exhibited superior hydrolytic and thermal stability as compared with the conventional tetrabromo bisphenol-A epoxies which are ortho-brominated phenolics. The m-bromophenol moiety contributes to the extended device reliability while meeting flame retardency requirements as well.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980105
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 98
    Electronic Resource
    Electronic Resource
    Studies on new non-shrinking, thermally stable araldite®-type photopolymers with pendent aryl acryloyl groups. IV. Syntheses and photoreaction of araldite®-type photoresists with pendent aryl acryloyl groupsPart III cf. Lit.10. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 71-81 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Additionspolymere aus Bisphenol-A und Epichlorhydrin lassen sich mit Arylacryloylchloriden verestern. Die gebildeten Photoresists können mit UV-Licht (λ ≥ 280 nm) gehärtet werden. Aus FT-IR Messungen ergibt sich, daß die Netzwerkbildungsreaktion einem Zeitgesetz zweiter Ordnung gehorcht. DSC- und TGA-Messungen wurden durchgeführt. Die photovernetzten Polymeren weisen Glastemperaturen bis zu 171 °C auf und sind bis mindestens 350 °C thermisch stabil. Spektroskopische Daten werden aufgeführt.
    Notes: Addition polymers of bisphenol-A and epichlorohydrin can easily be esterified with aryl acryloyl chlorides to yield photosensitive polymers. The photoresists are curable with UV-irradiation (λ ≥ 280 nm). FT-IR measurements indicate that the network formation fonforms to second order kinetics. DSC and TGA measurements were carried out. The glass transition temperature of irradiated material is up to 171oC; the material is thermally stable up to 350oC. Spectral data are given.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980107
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 99
    Electronic Resource
    Electronic Resource
    The elastic constants of moulded polymeric compositesProject supported by the National Advanced Materials Committee. (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 39-49 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wird eine Ultraschall-Meßmethode vorgestellt, mit der sich fünf voneinander unäbhangige Elästizitatskonstanten von uniaxial symmetrischem Material bestimmen lassen. Für die Messung werden nur fünf Ultraschallausbreitungsgeschwindigkeiten benötigt. Vermessen wurden spritzgegossene Composite aus Polyphenylensulfid, Polyarylethersulfon mit Cardo-Seitengruppen, kurzen Kohlefasern und RUB. Die Ergebnisse zeigen eine enge Beziehung zwischen den elastischen Eigenschaften und der Struktur der Materialien auf.
    Notes: The paper makes an approach to the determination of the five independent elastic constants of uniaxial symmetric material with the ultrasonic immersion technique. Only five ultrasonic wave velocities are required during measurement. The elastic constants of the moulded composites comprised of poly(phenylene sulfide), poly(aryl ether sulfone) with cardo side groups, short carbon fiber and carbon black are measured by using the suggested treatment. The results exhibit a close relationship between the elastic properties and the structure of the materials.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980104
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 100
    Electronic Resource
    Electronic Resource
    Interpenetrating polymer network films as piezodialysis membranes (1992)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 198 (1992), S. 83-89 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Membranen aus interpenetrierenden Netzwerken (IPN) wurden auf ihre Eignung für die Anwendung als Piezodialyse-Membranen untersucht. Bei diesen IPN-Membrane? handelt es sich nicht um Mosaik-Membranen. Bei zwei der IPN-Membranen enthielten die Permeate eine höhere NaCl-Konzentration als die Ausgangslösung (differentialrefraktometrisch bestimmt). Für eine dieser Membranen wurden die Salzgehalte auchtitrimetrisch mit AgNO3 ermittelt; die Ergebnisse belegen den positiven Piezodialyse-Effekt.
    Notes: In the present study, interpenetrating polymer network (IPN) membranes were investigated for their potential application as piezodialysis membranes. These IPN membranes are not mosaic membranes. It was found that some of these membranes did show piezodialysis effects. Two of the membranes tested under high pressure gave permeates which were found to be more concentrated in sodium chloride than the initial feed solution, when analyzed by differential refractometry. The permeates from one membrane were double checked by titrating the chloride ion with silver nitrate solution. The results of the titration also indicated a positive effect.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1992.051980108
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...