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  • 1975-1979  (16,685)
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  • 1
    Electronic Resource
    Electronic Resource
    Effects of cerebellectomy on the cat's vertical vestibuloocular reflex (1979)
    Springer
    Pflügers Archiv 382 (1979), S. 51-55 
    Details
    ISSN: 1432-2013
    Keywords: Cerebellectomy ; Vestibuloocular reflex ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of cerebellectomy on the semi-circular canal evoked responses recorded from individual vertical and oblique eye muscles were studied in cats anesthetized with Ketamine. The phase lag relative angular acceleration of the electromyographic response was consistantly smaller over the frequency range tested (0.02–1.0 Hz) in cerebellectomized than in intact animals. This finding indicates that the time constant of the central, neural integrator was shifted towards smaller values by the lesion. This was also suggested when the vertical eye movements generated by rotation about the pitch axis were recorded in the fully alert animal. In addition, the EOG data show that the phase of the VOR in the low frequency range was not altered following cerebellectomy suggesting that the macular influences were still present. When the EMG responses of the superior oblique (SO) and superior rectus (SR) muscles were studied in their presumed main mode, i.e. roll-canal and pitch-canal, respectively, no difference was noted in hemicerebellectomized animals when compared to intact control animals. However, when SO and SR were studied in pitch-canal and roll-canal rotation, respectively, dramatic changes in the response pattern were noted in lesioned animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00585903
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  • 2
    Electronic Resource
    Electronic Resource
    On the central generation of locomotion in the low spinal cat (1979)
    Springer
    Experimental brain research 34 (1979), S. 241-261 
    Details
    ISSN: 1432-1106
    Keywords: Locomotion ; Central generator ; Cat ; Deafferentation ; Spinal cord
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A central network of neurones in the spinal cord has been shown to produce a rhythmic motor output similar to locomotion after suppression of all afferent inflow. The experiments were performed mainly in acute spinal cats (th. 12), which had received DOPA i.v. and the monoamine oxidase inhibitor Nialamide. In some preparations all dorsal roots supplying the spinal cord were transected, in others phasic afferent activity was suppressed by curarization. The activity was recorded as neurograms from nerve filaments or as electromyograms. It is concluded that: 1. alternating activity between flexors and extensors of foot, ankle, knee, and hip of one limb can still occur 2. the duration of the flexor discharges vary less with the cycle duration than the extensor discharges 3. different flexor muscles may retain individual patterns 4. the activity at different joints can be dissociated 5. there is at least one network for each limb 6. the coordination between the two hindlimbs can be alternating as in walking or be more closely spaced as in galloping 7. alternating activity in the ankle remains even when only segments L6, L7 and S1 are intact.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235671
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  • 3
    Electronic Resource
    Electronic Resource
    SEM study of the choroid plexus of the lateral ventricle in the cat (1979)
    Springer
    Anatomy and embryology 155 (1979), S. 323-331 
    Details
    ISSN: 1432-0568
    Keywords: Telencephalon ; Choroid plexus ; Lateral ventricle ; Blood vessels ; Micro Corrosion cast ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Corrosion casts of the complete vascular network of the choroid plexus of the lateral ventricle in the cat brain were studied in SEM using the injection-replication method. The villi of this plexus are located only on its supero-anterior and infero-posterior parts, being most densely packed in the former region, close to the interventricular foramen. The capillaries of the villi display small nodular thickenings, which suggest the presence of small, sinusoidal dilatations. The main vessel supplying the plexus with blood is the anterior choroidal artery. The plexus is also characterized by a particularly rich venous network, which is drained by a prominent (main) choroid vein. The vascular organization of the choroid plexus of the lateral ventricle in cat is compared to that of the corresponding plexuses in other mammals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00317645
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  • 4
    Electronic Resource
    Electronic Resource
    Primary vestibular afferent projections to the ipsilateral abducens nucleus in cats (1979)
    Springer
    Experimental brain research 37 (1979), S. 177-181 
    Details
    ISSN: 1432-1106
    Keywords: Cat ; Autoradiography ; Abducens nucleus ; Primary vestibular fibers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Primary vestibular projections to the ipsilateral abducens nucleus were found in cats by injecting anterograde tracer substances (radioactive proline and fucose) into Scarpa's ganglion. Labelling was observed in the rostral and middle portion of the abducens nucleus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474263
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  • 5
    Electronic Resource
    Electronic Resource
    Effets de la stimulation des mécanorécepteurs splanchniques sur l'activité des cellules cérébelleuses de Purkinje (1979)
    Springer
    Experimental brain research 37 (1979), S. 405-416 
    Details
    ISSN: 1432-1106
    Keywords: Cerebellum ; Purkinje Cells ; Splanchnic mechanoreceptors ; Cat ; Cervelet ; Cellules Purkinje ; Mécanorécepteurs splanchniques ; Chat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les activités simple et complexe de cellules de Purkinje du cervelet du Chat (zone vermienne des lobules V et VI) ont été enregistrées au moyen de microélectrodes extracellulaires. Ces réponses étaient obtenues par stimulation de différents types de mécanorécepteurs du tractus gastro-intestinal: récepteurs musculaires connectés à des fibres C, récepteurs péritonéaux de mouvement connectés à des fibres Aγδ ou B, corpuscules de Pacini connectés à des fibres Aβ. Les caractéristiques des fibres splanchniques projetant sur cette aire cérébelleuse ont été définies. Des convergences splanchno-somatiques, splanchno-viscérales et splanchno-corticales ont été mises en évidence.
    Notes: Summary Climbing and mossy fibre activity in Purkinje cells of cat cerebellum (vermis part of lobules V and VI) were recorded by means of extracellular microelectrodes. Responses were obtained by stimulation of different types of mechanoreceptors in the gastro-intestinal tract: muscular receptors connected with C fibres, peritoneal movement receptors connected with Aγδ or B fibres, Pacinian corpuscules connected with Aβ fibres. The characteristics of the splanchnic fibre projections on this cerebellar area were defined. Splanchno-somatic, splanchno-visceral, and splanchno-cortical convergences were demonstrated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236814
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  • 6
    Electronic Resource
    Electronic Resource
    Identification of the projection from the visual cortex to the claustrum by anterograde axonal transport in the cat (1979)
    Springer
    Experimental brain research 34 (1979), S. 197-200 
    Details
    ISSN: 1432-1106
    Keywords: Claustrum ; Visual cortex ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Visual cortex, including areas 17, 18, and sometimes 19, was injected with tritiated leucine. Terminal labelling could be detected by autoradiography in the dorsocaudal part of the ipsilateral claustrum in all cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238353
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  • 7
    Electronic Resource
    Electronic Resource
    Discriminative stimulus properties of psychomotor stimulants in the cat (1979)
    Springer
    Psychopharmacology 63 (1979), S. 151-153 
    Details
    ISSN: 1432-2072
    Keywords: Discriminative stimulus properties ; Psychomotor stimulants ; Cat ; d-Amphetamine ; Clozapine ; Cocaine ; Morphine
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Cats were trained to choose between two levers of an operant chamber using interoceptive cues provided by d-amphetamine or saline as the discriminative stimuli. Following training, stimulus generalization was observed to additional doses of d-amphetamine and cocaine, but not to morphine. Clozapine blocked the generalization of the drug discrimination response to d-amphetamine, but had no effect on generalization to cocaine. These data indicate that discriminative stimulus properties of psychomotor stimulants, previously described in rats, are similar in cats.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00429694
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  • 8
    Electronic Resource
    Electronic Resource
    Lafora-like bodies in a cat (1979)
    Springer
    Acta neuropathologica 48 (1979), S. 55-58 
    Details
    ISSN: 1432-0533
    Keywords: Lafora-like bodies ; Morphogenesis ; Glycogen metabolism ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Lafora-like bodies in an 8-year-old cat were studied light and electron microscopically and histochemically. In addition to Lafora-like bodies composed of branching filaments, glycogen granules and electron-dense materials, abnormal accumulations of glycogen granules attracted attention. The most remarkable features were the developmental processes of the branching filaments originating directly from glycogen granules. Lafora-like bodies in the present study showed ultrastructural, histochemical, and enzymatic similarities to those described in the previous reports in Lafora's disease, glycogenosis and other cases. From these results, a certain disturbance of the glycogen metabolism is considered to be probably related to the productive mechanism of Lafora-like bodies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00691791
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  • 9
    Electronic Resource
    Electronic Resource
    Responses of single cells in cat's lateral geniculate nucleus and area 17 to the velocity of moving visual stimuli (1979)
    Springer
    Experimental brain research 34 (1979), S. 273-286 
    Details
    ISSN: 1432-1106
    Keywords: Stimulus velocity ; Single cell responses ; LGN ; Area 17 ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Neuronal responses to moving visual stimuli were recorded in the lateral geniculate nucleus (LGN) and area 17 of cats. Response duration (DE), number of spikes (NT), and mean frequency (FM) were estimated from the response histograms and analysed for their dependence on stimulus velocity. In the LGN, for about 2/3 of cells these response parameters changed monotonically with velocity up to about 100 °/s. In 1/3 of the cells, the response frequency was tuned to velocity. The speed at which individual cells reached a peak or plateau firing rate was correlated with their receptive field size. In area 17, most neurones were tuned to velocity. Nine out of 59 cells were insensitive to stimulus speed in that they responded equally well at stimulus velocities up to about 10 °/s. The results suggest that at higher levels in the nervous system information about velocity is represented in discrete groups of neurones. It is pointed out that different response parameters may be relevant for different perceptual phenomena associated with movement. The significance of integrational properties and lateral inhibition of nerve cells for the development of complex response properties is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00235673
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  • 10
    Electronic Resource
    Electronic Resource
    Mise en evidence electrophysiologique des thermorécepteurs vagaux dans la région gastro-intestinale. Leur rôle dans la régulation de la motricité digestive (1979)
    Springer
    Experimental brain research 34 (1979), S. 419-434 
    Details
    ISSN: 1432-1106
    Keywords: Thermoreceptors ; Gastro-intestinal tract ; Vagal nerve ; C Fibres ; Cat ; Thermorecepteurs ; Tractus gastro ; Intestinal ; Nerf vague ; Fibres amyéliniques ; Chat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Chez des chats anesthésiés, des décharges sensitives vagales ont été enregistrées dans le ganglion plexiforme à l'aide d'électrodes extracellulaires en verre. Nous avons trouvé au niveau de l'antre et du duodénum, des récepteurs toniques, activés par des solutions chaudes (38–51 ° C avec un optimum à 46–49 ° C) ou froides (36–10 ° C avec un optimum à 12–10 ° C). Ces récepteurs ne répondent ni aux stimulus mécaniques (compression et distension des viscères), ni aux stimulus chimiques (perfusion avec des solutions glucosées ou acides). Ces récepteurs n'appartiennent donc pas au groupe des récepteurs polymodaux, mais ils doivent être considérés comme de véritables thermorécepteurs spécifiquement sensibles au chaud ou au froid. Les thermorécepteurs de la région gastro-duodénale sont connectés à des fibres vagales amyéliniques (vitesse de conduction: 0,8–1,4 m/s). Par ailleurs, le rôle éventuel des thermorécepteurs vagaux de la région gastro-duodénale dans la régulation de la motilité digestive a été recherché. En dérivant simultanément l'EMG en plusieurs points du tractus gastro-duodénal, il a été possible de démontrer que les stimulations froides et chaudes du duodénum, qui mettent en jeu les thermorécepteurs, provoquent une inhibition de l'activité électrique de l'antre. Les modifications persistent apèrs bisplanchnectomie, mais disparaissent complètement après bivagotomie. A partir de ces faits, nous en avons conclu que les thermorécepteurs vagaux sont impliqués dans la régulation nerveuse de la motilité gastro-duodénale.
    Notes: Summary In anaesthetized cats, sensory vagal units were recorded in the nodose ganglion by means of extracellular glass microelectrodes. In the antrum and the duodenum we have found receptors tonically activated by warm (38–51 ° C with an optimum at 46–49 ° C) or cold (36–10 ° C with an optimum at 12–10 ° C) solutions. These receptors did not respond to mechanical stimuli (compression and distension of the viscera) and to chemical ones (perfusion with glucose and acid solutions). Thus they did not belong to polymodal type, but they must be considered as true thermoreceptors, specifically sensitive to warm or cold stimulations. The gastro-duodenal thermoreceptors were connected to non-medullated vagal fibres (conduction velocity: 0.8–1.4 m/s). On the other hand, the role of the gastro-duodenal vagal thermoreceptors in the regulation of the digestive motility was studied. By using several electromyographic recordings, it was possible to show that the cold and warm stimulations of the duodenum which elicited thermoreceptor responses, induced an inhibition of the electrical activity of the antrum. The changes persisted after bisplanchnectomy, but disappeared completely after bivagotomy. From these facts it was concluded that the vagal thermoreceptors were involved in the nervous regulations of the gastro-duodenal motility.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239140
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  • 11
    Electronic Resource
    Electronic Resource
    Effects of ventrolateral thalamic nucleus cooling on initiation of forelimb ballistic flexion movements by conditioned cats (1979)
    Springer
    Experimental brain research 34 (1979), S. 435-452 
    Details
    ISSN: 1432-1106
    Keywords: Cooling ; Ventrolateral thalamic nucleus ; Pyramidal system ; Reaction time ; Ballistic movement ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Five cats were trained to perform a forelimb ballistic flexion on a reaction time paradigm including an upper limit of about 400 ms for reinforcement (food pellets). They were implanted with a cyrogenic probe thermically insulated, except at the tip, by a vacuum jacket (outer diameter, 1.1 mm). Four cats had the probe inserted into the ventrolateral thalamic nucleus (VL), contralateral to the moving limb. During cooling they showed increased reaction times, which remained constant throughout daily sessions performed during many weeks, independent of the foreperiod but varying from 25 to 100 ms according to the subject. The temperatures used to upset the reaction times varied from +10 ° C to −8 ° C, depending on the localisation of the probe and on the insulation of the silver tip used to prevent nervous tissue reaction, but for each subject the reaction times always increased when the temperature was lowered. The fifth cat, with a probe inserted between VL and the Centre Median, showed a decrease of reaction times on cooling to 0 ° C and an increase of the reaction times for a cooling at −10 ° C. For one of the four cats with a probe properly inserted into the VL, strain-gauges were stuck on the lever to measure the latency of the decrease of the pressure exerted by the subject when the subject initiated the forelimb flexion in response to the CS. Reaction times and latencies of pressure changes were closely correlated with the movement onset, and they were equally delayed during cooling. This result demonstrates that it is not by slowing down movement velocity that reaction times are upset during VL cooling but by delaying the movement onset.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239141
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  • 12
    Electronic Resource
    Electronic Resource
    Anatomical and electrophysiological identification of motoneurones supplying the cat retractor bulbi muscle (1979)
    Springer
    Experimental brain research 34 (1979), S. 541-550 
    Details
    ISSN: 1432-1106
    Keywords: Retractor bulbi motoneurones ; Accessory abducens nucleus ; 6th nerve ; Oculomotricity ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Motoneurones innervating the retractor bulbi muscle in the cat have been identified by retrograde labelling with horseradish peroxidase, by intracellular recording and by intracellular staining with horseradish peroxidase. Their somata are found in an accessory abducens nucleus, analogous to that described in some other species, which consists of a narrow column of cells situated in the lateral tegmental reticular field, above the superior olive and medial to the facial nerve. This column of cells extends over approximately 1.5 mm from P 5.5 to P 7. The retractor bulbi motoneurones number from 80 to 120 and have large, elongated somata which give rise to five or six major dendrites. Their axons cross the reticular formation in a dorso-medial direction to pass through the principal abducens nucleus before turning to leave the brain stem in the 6th nerve. Antidromic latencies ranged from 0.4 to 0.7 ms. Some retractor bulbi motoneurones could also be activated antidromically by stimulation of the lateral rectus muscle nerve.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00239148
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  • 13
    Electronic Resource
    Electronic Resource
    Classification of cat retinal ganglion cells into X- and Y-cells with a contrast reversal stimulus (1979)
    Springer
    Experimental brain research 35 (1979), S. 25-36 
    Details
    ISSN: 1432-1106
    Keywords: Retinal ganglion cells ; Cat ; Contrast reversal stimulus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary A contrast reversal (alternating phase) stimulus was used to study the responses of 150 retinal ganglion cells from 15 adult cats. Because the majority of the cells did not show perfect linear spatial summation, a ratio of the firing rates at two time periods was used to express the degree of nonlinearity. Y-cells showed a high degree of nonlinearity, and their mean null ratio was significantly lower than that of X-cells. With the stimulus at the null position, X-cells had an unmodulated discharge rate which was significantly higher than maintained activity, while the firing rate of Y-cells was lower than maintained activity. With the stimulus placed at an eccentric position in the receptive field, X-cells responded in a sustained manner, while Y-cells respond transiently. Because of these observations, we conclude that X-cells correspond to the sustained cells, while Y-cells correspond to the transient cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236782
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  • 14
    Electronic Resource
    Electronic Resource
    Various types of corticotectal neurons of cats as demonstrated by means of retrograde axonal transport of horseradish peroxidase (1979)
    Springer
    Experimental brain research 35 (1979), S. 161-175 
    Details
    ISSN: 1432-1106
    Keywords: Cerebral cortex ; Superior colliculus ; Cat ; Horseradish peroxidase method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The retrograde labeling of cortical neurons with horseradish peroxidase (HRP) was used to investigate the morphological features of neurons in various cortical areas projecting to the superior colliculus in the cat. Corticotectal cells were found to be labeled in layer V of the entire cerebral cortex. The number of labeled cells and their locations varied according to the sites of injections of HRP in the colliculus. Most of the Corticotectal cells identified in the present study were small (9–20 μm in diameter, 66%) and medium (20–40 urn, 30%) pyramidal neurons and only 4% of them were large (more than 40 μm). The labeled cells, 261 in total number, had somal diameters of 20.8±8.0 μm (mean and SD). The range of sizes of the labeled neurons was different in different cortical areas. For example, the labeled neurons in the Clare-Bishop area had a greater proportion of large diameter cells than in other areas. The present findings are largely in agreement with the previous data of anterograde degeneration methods with respect to the topographical correlation of the Corticotectal projections. However, in some cortical areas, e.g., the sensorimotor and the first visual (area 17) cortex of the lateral surface of the hemisphere, relatively small numbers of Corticotectal neurons appear to have been labeled by retrogradely transported HRP. The sparsity of the labeled neurons in certain cortical areas may reflect the existence of Corticotectal neurons with axon collaterals supplying brain structures other than the superior colliculus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236792
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  • 15
    Electronic Resource
    Electronic Resource
    Cortical neurons projecting to the pontine nuclei in the cat. An experimental study with the horseradish peroxidase technique (1979)
    Springer
    Experimental brain research 35 (1979), S. 269-285 
    Details
    ISSN: 1432-1106
    Keywords: Cerebral cortex ; Pontine nuclei ; Cat ; Horseradish peroxidase method
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Horseradish peroxidase (HRP) injections in various portions of the cat pontine nuclei resulted in retrograde labeling of neurons in layer V of the ipsilateral cerebral cortex. Corticopontine neurons, pyramidal in type, have been found to be labeled in the entire cortex, confirming the previous findings of anterograde degeneration studies. Most (91%) of the labeled cells were 14–26 μm in diameter (mean 19.4±4.5 μm SD). Small (10–20 μm) and medium (20–40 μm) cells represent 51.5% and 47.7%, respectively, of the total number of the labeled neurons. The populations of the neurons of various sizes were almost identical in different cortical areas, and were different from the populations of corticoreticular and corticospinal cells. Corticopontine cells were well labeled in experimental cases of 3-days' survival time, confirming the topographical organization established previously by degeneration studies for this projection system. However, in cases of shorter survival time (20–27 h), the number of labeled neurons was very small. The relative paucity of labeled Corticopontine neurons in the sigmoid and lateral gyri is discussed with reference to other cortical descending neurons (e.g., the corticotectal, corticoreticular and corticospinal) which have hitherto been identified morphologically as well as physiologically.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236615
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  • 16
    Electronic Resource
    Electronic Resource
    Cat phrenic nucleus architecture as revealed by horseradish peroxidase mapping (1979)
    Springer
    Experimental brain research 35 (1979), S. 395-406 
    Details
    ISSN: 1432-1106
    Keywords: Cat ; Spinal cord ; Phrenic motoneurons ; Neuron geometry ; Horseradish peroxidase
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Cat phrenic motoneurons, labeled by intradiaphragmatic injection of horseradish peroxidase, formed a tight cluster in the most ventral portion of the ventral horn in lamina IX of the lower cervical cord. Cell counts were symmetrically distributed for 17 to 21 mm along the longitudinal axis of the cord with a unimodal peak at the junction of segments C5 and C6. The phrenic nucleus was bilaterally organized on either side of the cord with anatomical symmetry and in no case was there evidence for the crossing of phrenic axons in the cord. Assessment of cellular geometry and intercellular relationships demonstrated that phrenic cell diameters approximated a normal distribution with a single peak at 26 μm while longitudinal cell lengths averaged 76 μm. Cells of different size were mixed randomly at all levels of the nucleus. The minimum distance between cells was about 10 μm and the maximum cell packing density approached 2 cells per 106 μm3. The results confirm the location of the cat phrenic nucleus, extend the knowledge of phrenic motoneuronal geometry, and provide an anatomical basis for the understanding of recruitment and synchronization phenomena within the phrenic nucleus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236759
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  • 17
    Electronic Resource
    Electronic Resource
    Visual suppression from nondominant eye in the lateral geniculate nucleus: A comparison of cat and monkey (1979)
    Springer
    Experimental brain research 35 (1979), S. 465-477 
    Details
    ISSN: 1432-1106
    Keywords: Cat ; Monkey ; Lateral geniculate nucleus ; Visual nondominant suppression
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We have studied the suppression of firing in single LGN cells of cat and monkey in response to visual stimulation of the nondominant eye. In the cat LGN most of the cells of each of the main laminae show this nondominat suppression. X cells having their dominant input from the ipsilateral eye were suppressed to a significantly greater degree than any other cell type in the cat LGN. In the monkey LGN nondominant suppression was absent in all 19 X-like cells studied, whereas 6 of 21 Y-like cells showed nondominant suppression. Thus nondominant suppression is present in the magnocellular laminae of the monkey LGN, where the Y-like cells are found, but appears to be absent from the parvocellular laminae, where the X-like cells are found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236765
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  • 18
    Electronic Resource
    Electronic Resource
    Thermosensory defects after cervical spinal cord lesions in the cat (1979)
    Springer
    Experimental brain research 35 (1979), S. 479-494 
    Details
    ISSN: 1432-1106
    Keywords: Thermosensitivity ; Lesions ; Spinal cord ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The behavioural thermosensitivity of cat paws was examined before and/or after restricted uni- and/or bilateral lesions had been made in the spinal cord between the first and fifth cervical segments. Unilateral lesions of the lateral funiculus, which involved at least its whole width at the level of the central canal, reproducibly were found to interfere with the contralateral sensitivity for temperature increases and/or decreases. No corresponding thermosensory deficiencies were found after unilateral lesions involving the ventral spinal quadrant or the dorsal funiculus. Various bilateral and combined lesions were made, but no cat ever developed thermoanaesthesia. The bilateral lesions included bilateral transections of: the middle parts of the lateral funiculi, the dorsal halves of the lateral funiculi, the dorsal funiculi, and the ventral spinal half. Most of our knowledge about peripheral behavioural thermosensitivity after spinal cord injury is based on observations of human patients, especially after anterolateral chordotomies. The present finding of contralateral thermosensory deficiencies after lesions of the middle part of the lateral funiculus fits with some of the clinical reports. The present failure to cause thermoanaesthesia, on the other hand, is inconsistent with the theory of a single ascending spinal pathway for behavioural thermo-sensitivity, which has emanated mainly from the clinical observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236766
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  • 19
    Electronic Resource
    Electronic Resource
    A comparison of visual responses in two pretectal nuclei and in the superior colliculus of the cat (1979)
    Springer
    Experimental brain research 35 (1979), S. 495-510 
    Details
    ISSN: 1432-1106
    Keywords: Pretectal nuclei ; Superior colliculus ; Visual response pattern ; Retinal input types ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single unit recordings from 220 units were obtained from the nuclei praetectalis anterior (NPA) and posterior (NPP) of 30 immobilized, anesthetized cats. Quantitative analysis of pretectal (PT) visual activity was mainly based on recordings from the NPP. For comparison, 160 collicular (CS) neurons were studied. A strong sensitivity for moving objects was evident in both samples. The following main types of PT activity were categorized: (A) slow movement, direction-selective units (21%); (B) slow movement, nondirection-selective units (19%); (C) units nonselective for stimulus velocity and direction (24%); (D) jerk movement selective, nondirection-selective units (36%). Latency measurements following single shocks to optic chiasm (OX) and tract (OT) showed mainly slow conducting fiber input to the PT and CS which can be divided into two different groups by conduction properties and synaptic delay: direct W-input and delayed W-input. Fast Y-fiber input of both types, direct and indirect, was recorded at both sites, PT and CS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236767
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    Electronic Resource
    Electronic Resource
    Hypercomplex cell types in area 18 of the cat (1979)
    Springer
    Experimental brain research 36 (1979), S. 191-194 
    Details
    ISSN: 1432-1106
    Keywords: Hypercomplex cells ; Area 18 ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Single unit recording has revealed the same orientation sensitive cell classes in cat area 18 as are to be found in area 17. These include particularly the various types of hypercomplex cell belonging to the S, C, and B cell families.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238477
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  • 21
    Electronic Resource
    Electronic Resource
    Activity of ventrolateral thalamic neurons in relation to a simple reaction time task in the cat (1979)
    Springer
    Experimental brain research 36 (1979), S. 285-300 
    Details
    ISSN: 1432-1106
    Keywords: VL nucleus ; Single units ; Reaction time ; Movement initiation ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Unrestrained cats performed ballistic forelimb flexion movements triggered by an auditory stimulus (CS) on a simple reaction time (RT) paradigm. During the variable foreperiod the subject was required to hold down a lever and to release it on presentation of the CS. The RTs ranged from 200 to 300 ms. The activity of single neurons of the ventrolateral nucleus of the thalamus (VL) was recorded bilaterally. More than 40% of the 166 units recorded in the VL contralateral to the performing limb presented, after the CS, changes of activity with a latency less than 100 ms and were classified into three types: (1) Twenty-five units had a short latency transient increase of activity 10 to 30 ms after the CS, followed by a longer increase or decrease in activity. Short latency increase as well as subsequent increase of the firing rate were not correlated to the RTs. (2) Twenty-nine units showed a 40–60 ms latency increase of activity which lasted long enough to continue during the forelimb movement. These units displayed a correlation between the RTs and the mean firing rate measured in the 40–100 ms period after the CS. The more the cells were activated, the shorter the RTs. (3) Fifteen units presented a reciprocal pattern of discharge with respect to the type (2) units. The firing rate decreased with latencies ranging from 20 to 90 ms after the CS. Only 14,5% of the 96 units recorded in the VL ipsilateral to the performing limb presented changes of activity starting in the 100 ms period following the CS. Background firing levels as well as phasic activity were rather low compared to those observed contralaterally. Sixteen units showed burst activity while the cat was performing but burst pattern was not time-related to the task. In an unconditioned animal, a very low level of activity and an absence of modulations were observed in both VLs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00238912
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  • 22
    Electronic Resource
    Electronic Resource
    The role of maturation and visual experience in the development of eye alignment in cats (1979)
    Springer
    Experimental brain research 37 (1979), S. 41-47 
    Details
    ISSN: 1432-1106
    Keywords: Eye alignment ; Cat ; Visual experience ; Maturation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary In the developing kitten, the alignment of the pupils changes from strongly divergent to almost parallel. The visual axes, however, seem to stay almost parallel throughout this period. The influence of early visual experience on this development is examined in the present study. The results suggest that the development of eye alignment is not controlled by visual experience, but depends on maturational processes, and that normal visual input serves only to halt these processes at the appropriate time.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01474252
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  • 23
    Electronic Resource
    Electronic Resource
    14C-Deoxyglucose mapping of orientation subunits in the cats visual cortical areas (1979)
    Springer
    Experimental brain research 37 (1979), S. 609-613 
    Details
    ISSN: 1432-1106
    Keywords: Orientation subunits ; Visual cortex ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The orientation domain in the cortical visual areas of anesthetized cats has been investigated by employing the 14C-Deoxyglucose technique (Sokoloff et al., 1977). Orientation subunits (OS) are seen in the first (V1), the second (V2) and the third visual area (V3) as well as in the visual areas of the suprasylvian sulcus. In the latter regions OS are less elaborated than in V1, V2, and V3. The OS are continuous through all cortical layers; in V1 however, only weak label is detected in layer 4C. In V1, V2, and V3 the width of the OS is about 0.4 mm and the average distance between two OS centers is 0.9 mm. The spatial pattern of the OS seems to be more regular in the visual field periphery than in regions representing the vertical meridian.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236828
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  • 24
    Electronic Resource
    Electronic Resource
    The effects of splanchnic nerve stimulation on the plasma levels of serotonin and substance P in the portal vein of the cat (1979)
    Springer
    Journal of neural transmission 46 (1979), S. 105-112 
    Details
    ISSN: 1435-1463
    Keywords: Cat ; electrical stimulation ; serotonin ; splanchnic nerves ; substance P
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The blood levels of serotonin (5-HT) and substance P (SP) in the portal vein were studied after splanchnic nerve stimulation in the cat. The portal levels of both substances were studied before, during and after splanchnic nerve stimulation. There was a twofold increase in 5-HT during stimulation whilst the SP concentration remained unchanged. These results suggest that the nervous control of the amine release into the portal stream and the mechanism that regulates the release of the polypeptide is not the same.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01250332
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  • 25
    Electronic Resource
    Electronic Resource
    Brain-stem responses of the cat and interaural attenuation (1979)
    Springer
    European archives of oto-rhino-laryngology and head & neck 222 (1979), S. 113-118 
    Details
    ISSN: 1434-4726
    Keywords: Brain-stem electric response (BSER) ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The early auditory evoked responses have been studied in bilaterally hearing cats, and in animals with hereditary unilateral anacusis. Cross-over stimulation of the hearing ear occurs at an interaural attenuation of 50-50 dB, and all six waves of the responsare present at supra-threshold stimulus levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00469750
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  • 26
    Electronic Resource
    Electronic Resource
    Types of thalamo-cortical relay neurons in the anteroventral nucleus of the cat (1979)
    Springer
    Cell & tissue research 196 (1979), S. 175-179 
    Details
    ISSN: 1432-0878
    Keywords: Thalamo-cortical projection ; Anteroventral nucleus ; HRP retrograde transport ; Golgi impregnation ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Neurons displaying a thalamo-cortical projection were marked by means of the retrograde transport of horseradish peroxidase (HRP), and the labeled elements were compared with neurons impregnated by the Golgi technique. Injections of HRP into the posterior area of the limbic cortex resulted in its uptake by various anterior thalamic nuclei, especially the anteroventral nucleus. HRP-positive cells are characterized by their position, dendritic orientation, and the shape and size of their somata. On the basis of the combined HRP- and Golgi-analysis three different types of thalamo-cortical relay neurons can be distinguished.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00236358
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  • 27
    Electronic Resource
    Electronic Resource
    Herstellung und Prüfung festkörpergeschweißter Keramik-Metall-Verbindungen (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 276-284 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Preparation and Testing of Solid-State Bonded Ceramic-to-Metal-JointsCeramic-to-metal joints were manufactured by solid-state bonding in a R. F.-high-vacuum apparatus. The influence of welding temperature, welding time and welding pressure on the bond strength was investigated for an alumina/niobium-combination consisting of a layered composite ceramic-metal foil-ceramic. As a measure of bond quality the fracture resistance KICV was chosen. KICV date were obtained by the use of 4-point bend tests and tensile tests. For comparison, data are presented concerning the fracture resistance KIC of the bulk alumina and the conventional bond strength of the joints. In addition to the Nb/Al2O3-data, KICV factors are determined for other metal/alumina combinations and for a Zr/Si3N4 joint. The present solid-state bonding apparatus was used for the preparation of the specimens. A device for high-temperature bend testing in a high vacuum was constructed. Some data for the high-temperature bond strength of solid-state bonded joints are given.
    Notes: Keramik-Metall-Verbindungen wurden durch Festkörperschweißen in einer HF-HV-Apparatur hergestellt. Der Einfluß der Herstellungsparameter, Schweißtemperatur, Schweißzeit und Schweißdruck auf die Bindefestigkeit wurde für eine Al2O3/Nb-Materialkombination der Schichtanordnung Keramik-Metallfolie-Keramik untersucht. Als Maß für die Bindequalität wurde der Bruchwiderstand der Verbindung KICV gewählt. KICV wurde im Vierpunkt-Biegeversuch und im Zugversuch ermittelt. Zum Vergleich wurden Bruchwiderstandswerte KIC der Ausgangskeramik und konventionelle Haftfestigkeitskennwerte bestimmt. Außer für Nb/Al2O3-Kombinationen werden für andere, mit der vorhandenen Schweißvorrichtung hergestellten Metall/Al2O3-Kombinationen und für eine Zr/Si3N4-Paarung Bindefestigkeitsdaten angegeben. Eine Vorrichtung zur HV-Hochtemperaturbiegeprüfung wurde gebaut. Einige Daten zur Hochtemperatur-Bindefestigkeit festkörpergeschweißter Verbindungen werden mitgeteilt.
    Additional Material: 17 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100808
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  • 28
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    Electronic Resource
    Zahnradgetriebe 1979. VDI-Bericht 332. Von Tagung der VDI-Gesellschaft Konstruktion und Entwicklung, München 1979. Verlag Chemie GmbH., Postfach 1260/1280, 6940 Weinheim. 1979, 288 288 Seiten, 425 Bilder, ISBN 3-18-090332-5, kart. 131,-DM (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 292-292 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100810
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  • 29
    Electronic Resource
    Electronic Resource
    Nachrichten - Hinweise (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A72 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100902
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  • 30
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    Nachrichten - Hinweise (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A74 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100903
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  • 31
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    Nachrichten - Hinweise (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A76 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100905
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  • 32
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    Zum Ausscheidungs- und Korrosionsverhalten eines ferritisch-austenitischen Chrom-Nickel-Molybdän-Stahles nach kurzzeitiger Glühbehandlung unter besonderer Berücksichtigung des SchweißensAuszug aus der gleichnamigen Dissertation des erstgenannten Verfassers, Darmstadt, 1978, D 17. (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 317-332 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Structural changes and corrosion behaviour of a ferritic-austenitic chromium-nickel-molybdenum steel after short time heat treatments with special consideration of weldingSusceptibility of the ferritic-austenitic steel X 2 CrNiMoN 225 in the solution treated and quenched state to intergranular corrosion and to stress corrosion cracking and pitting corrosion in solutions with chloride ions. Comparison with two austenitic steels (X 5 CrNi 189 and X 3 CrNiMoN 17135). Investigations of the influence of structural changes due to short time isothermal heat treatments and to welding on the mentioned three corrosion types.
    Notes: Verhalten des ferritisch-austenitischen Stahles X 2 CrNiMoN 225 (Werkstoff-Nr. 1.4462) im lösungsgeglühten und abgeschreckten Zustand gegenüber interkristalliner Korrosion (IK) sowie Spannungsrißkorrosion (SpRK) und Lochkorrosion in chloridhaltigen wäßrigen Medien. Vergleich mit den beiden austenitischen Stählen X 5 CrNi 189 (Werkstoff-Nr. 1.4301) und X 3 CrNiMoN 17135 (Werkstoff-Nr. 1.4439). Untersuchungen zum Einfluß der Gefügeänderungen infolge kurzzeitiger isothermer Glühbehandlungen und Schweißungen auf das Verhalten gegenüber den genannten drei Korrosionsarten.
    Additional Material: 22 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100909
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  • 33
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    Korrosionsschutz - Beschichtungsschäden auf Stahl Von K.-A. van Oeteren, Bauverlag GmbH, Wiesbaden. 1979, 213 Seiten, zahlreiche Abbild., 15 × 21 cm, geb. 60,-DM (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 332-332 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100911
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  • 34
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    Nachrichten - Hinweise (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A80 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790101002
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  • 35
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    Some metallurgical observations upon the Preparation of Zircaloy 2/Stainless Steel Joints (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 349-353 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Einige metallurgische Beobachtungen zur Herstellung von diffusionsgeschweißten Übergängen zwischen Zircaloy 2 und EdelstahlEs wird ein Verfahren zur Verschweißung von Zircaloy 2 mit Edelstahl durch Ko-Extrusion vorgeschlagen. So hergestellte Schweißverbindungen wurden an der Nahtstelle zwischen Zircaloy 2 und Edelstahl metallographisch und im Rasterelektronenmikroskop untersucht. Außerdem wurden eine chemische Analyse sowie mit der Elektronen-Mikrosonde durchgeführt.Die Ergebnisse dieser Untersuchungen zeigt, daß mit diesem Verfahren eine perfekte Verbindung der beiden Materialien durch mechanische und metallurgische Vorgänge erzielt wird, die besser sein sollte als durch Diffusion bei hohen Temperaturen hergestellte Übergänge.
    Notes: A method of welding stainless steel to Zircaloy 2 by co-extrusion is proposed, and joints of these two metals have been made in this manner. Such a bond was examined at the interface between stainless steel and Zircaloy 2 using metallography, electron microprobe analysis, scanning electron microscopy and chemical analysis. It was found that this method of preparation the joints allow for sound connections characterized by the formation of a type of mechanical and metallurgical bond. These joints could be considered better than those obtained by diffusion at high temperatures.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790101006
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  • 36
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    Werkstoffauswahl und Oberflächenbehandlung unter tribotechnischen Gesichtspunkten (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 456-466 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: The material selection for tribologically stressed specimen and tools has to be done not only from the view point of economics but also of the consumption of scarce materials and energy.Empirical methods are used for this selection to get a reasonable compromise between surface and bulk functions to satisfy stability and rigidity.By applying system- and stress analysis for the estimation of surface and bulk properties some examples of metallurgical, manufacturing, operational and lubricating aspects to improve the tribological behaviour of components are shown.Using the friction energy for a wear prediction model the calculation of lifetime for dry lubricated roller bearings is possible.
    Notes: Eine funktionsgerechte Werkstoffauswahl für tribologisch beanspruchte Werkzeuge und Bauteile ist nicht nur eine Forderung der Wirtschaftlichkeit, sondern gewinnt auch vor dem Hintergrund der Rohstoff- und Energiesicherung eine zunehmende Bedeutung.Die Werkstoffauswahl tribologisch beanspruchter Werkzeuge und Bauteile wird nach wie vor überwiegend nach empirischen Methoden vorgenommen, wobei häufig Kompromißlösungen zwischen der Oberflächenfunktion und der Grundwerkstoff-Funktion zur Erfüllung der Festigkeits- und Steifigkeitsanforderungen eingegangen werden müssen.Ausgehend von einer methodischen Vorgehensweise einer System-und Beanspruchungsanalyse zur Abschätzung der Oberflächen- und Grundwerkstoffbeanspruchung wurden an verschiedenen Beispielen werkstoffkundliche, fertigungstechnische, konstruktive und schmiertechnische Gesichtspunkte zur Verbesserung des tribologischen Verhaltens von Bauteilpaarungen aufgezeigt.Durch Anwendung eines energetischen Verschleißmodells konnten Berechnungsmöglichkeiten zur Lebensdauerbestimmung feststoffgeschmierter Wälzlager angegeben werden.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790101210
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  • 37
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    Ergebnisse von Zeitstandversuchen mit glatten und gekerbten Proben aus den Stählen 20 CrMoV 13 5 und X20CrMoWV 121 (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 1-14 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Results of Creep Tests With Smooth and Notched Specimens of the Steels 20 CrMoV 13 5 and X20 CrMoWV 121Two hydrogen resistant steels, viz. 20 CrMoV 13 5 W.-Nr. 1.7779) and X20 CrMoWV 12 1 (W.-Nr. 1.4935) used for bolts and nuts as well as for pressurized components were tested with respect to their creep resistance. Using smooth and notched specimens creep data for 450°C 500°C and 550°C were established. Steel 20CrMoV 13 5 was investigated in two quenched and tempered states (225…250 HB, 285…310 HB. The tempering treatments of X20 CrMoWV 12 1 (W.-Nr. 1.4935) lead to hardness levels of 215…226 HB resp. 275… 310 HB.Creep tests at 450°C and 500°C resp. at 500°C and 550°C were undertaken with smooth and notched specimens of 20 CrMoV 13 5-resp. X20 CrMoWV 12 1 -steels. At each temperature two resp. three different hardness levels were investigated which were produced by changing the quenching and tempering procedure. The results prove the X20 CrMoWV 12 1-steel to show high ductility in all three Q + T conditions even after long creep tests. This holds true for the 20 CrMoV 13 5-steel in the soft condition and at a test temperature of 450°C only. The creep strength of both steels is about proportional to the ultimate strength of both steels is about proportional to the ultimate strength at room temperature. With regard to the allowable stresses it could be shown that in each case the creep strength for 100.000 hours divided by a safety factor of 1.5 is smaller than the 1% creep limit for the same time.
    Notes: Mit glatten und gekerbten Proben aus den Stählen 20 CrMoV135 und X20 CrMoWV 12 1 wurden Zeitstandversuche bei 450 und 500°C bzw. bei 500 und 550°C durchgeführt Beide Stähle lagen in verschieden harten Ausgangszuständen vor. Die Ergebnisse weisen für den X20 CrMoWV 12 1-Stahl auch nach langen Laufzeiten in allen drei Ausgangszuständen eine hohe Duktilität nach, während dies für den 20 CrMoV 13 5-Stahl nur im weichen Zustand und nur bei 450°C Prüftemperatur gilt. Die Zeitstandfestigkeit ist proportional der Zugfestigkeit des Ausgangszustandes bei Raumtemperatur. In jedem Fall ist der Wert 2/3 der Zeitstandfestigkeit für 100000 h kleiner als der Wert der 1%-Dehngrenze für 100000 h.
    Additional Material: 29 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100106
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  • 38
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    Modelluntersuchungen zur Faserverstärkung keramischer Werkstoffe (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 14-23 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Model Investigation of the Fibre Reinforcement of Ceramic MaterialsA mechanism for fibre reinforcement of high-modulus brittle materials, in particular ceramics, is investigated both experimentally and theoretically. A simple mathematical formalism representing crack extension in a brittle matrix reinforced by ductile fibres is derived, and characteristic property values, adapted to composite structures, are introduced.Alumina with unidirectional reinforcement by thin 80Ni20Cr wires is used as a model material.The mechanism presented allows to reduce the high sensivity of ceramic materials to cracks. It is necessary for the fibres to bridge matrix cracks under load. For this purpose, the fibres must not be bound too tightly to the matrix, and while a high ductility is certainly of value, it is not a necessity. The efficiency of the mechanism depends on -interface energy and friction at the matrix-fibre interface,-deformation and fracture behavior of the fibre material,-radius of the fibres,-volume fraction of the fibres,-critical stress intensity factor of the matrix,-size of the largest crack.Among these, the fibre radius appears to be the most suitable one for variation with the goal of optimizing material quality.
    Notes: Ein Faserverstärkungsmechanismus für spröde, insbesondere keramische Werkstoffe mit hohem Elastizitätsmodul wird theoretisch und experimentell untersucht.Ein einfache mathematischer Formalismus zur Beschreibung des Rißausbreitungsverhaltens in dementsprechend verstärkten Werkstoffen wird angegeben. Verbundwerkstoffspezifische Kenngrößen werden eingeführt.Als Modellwerkstoff für die experimentellen Untersuchungen dient Aluminiumoxid mit eingelagerten Feindrähten aus 80Ni20Cr.Der beschriebene Mechanismus ermöglicht es, die hohe Rißempfindlichkeit keramischer Werkstoffe herabzusetzen. Die Fasern müssen in der Lage sein, belastete Matrixrisse zu überbrücken. Hierzu dürfen sie nicht zu fest an die Matrix gebunden sein. Duktilität der Fasern ist günstig, aber nicht notwendig. Die Wirksamkeit des Mechanismus hängt ab von -der Grenzflächenergie und -reibung zwischen Fasern und Matrix,-dem Verformungs- und Bruchverhalten der Fasern,-dem Faserradius,-dem Volumenbruchteil der Fasern,-dem kritischen Spannungsintensitätsfaktor der Matrix,-den Abmessungen der größten Risse.Zur Werkstoffoptimierung läßt sich unter diesen Größen am leichtesten der Faseradius variieren.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100107
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    Electronic Resource
    Masthead (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979) 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100301
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  • 40
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    Nachrichten - Hinweise (pp. A24) (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A24 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100302
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  • 41
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    Nachrichten - Hinweise (pp. A28) (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A28 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100305
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  • 42
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    Veranstaltungskalender (pp. A27) (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A27 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100304
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  • 43
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    Nachrichten - Hinweise (pp. A26) (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A26 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100303
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  • 44
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    Schrumpfungen, Spannungen und Risse beim Schweißen. Von Dr. -Ing R. Malisius. 4. Aurflage, Deutscher Verlag für Schweißtechnik GmbH. 4 Düsseldorf, 161 Seiten, 113 Bilder, 11 Tabellen, DIN C 5 Ln.-Hln.-kart. 36,-DM (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 112-112 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100311
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  • 45
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    Nachrichten - Hinweise (pp. A29) (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A29 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100313
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  • 46
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    Nachrichten - Hinweise (pp. A32) (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A32 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100402
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  • 47
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    Veranstaltungskalender (pp. A35) (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A35 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100404
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  • 48
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    An investigation of Stress corrosion cracking in MgAZ61 alloy in 3.5% NaCl + 2% K2CrO4 aqueous solution at room temperature (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 119-123 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Untersuchung der Spannungsrißkorrosionsanfälligkeit einer Legierung MgAlZn61 in wäßriger Lösung von 3,5% NaCl + 2% K2CrO4 bei Raumtemperatur.
    Notes: Effect of specimen orientation, heat treatment and applied potential on the stress corrosion susceptibility of magnesium AZ61 (Mg-6.3% Al-0.5% Zn-0.20% Mn) alloy in an aqueous 3.5% NaCl + 2% K2CrO4 solution at room temperature was investigated. Stress corrosion times to failure were measured at different values of initial stress intensities using single edge (pre) cracked sheet tensile specimens and a modified tensometer. It was observed that while the specimen orientation has a significant effect on the measured values of stress corrosion threshold stress intensity, KIscc, the effect of varying the quench rate during heat treatment was minimal. Polarization measurements both in stressed and unstressed conditions, failed to reveal any significant effect of the applied stress intensity on the anodic polarization behavior of the alloy. However, measurements made under four different potentiostatic conditions showed a considerable increase in stress corrosion times to failure of the alloy. The results, together with fractographic observations of fractured specimen are discussed in terms of the mechanisms of stress corrosion cracking, in magnesium alloys.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100407
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  • 49
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    Zeitstanduntersuchungen an Kupfer-Knetlegierungen für den Chemie-Apparatebau (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 185-190 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100605
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  • 50
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    Creep-Properties of Thermoplastics and Duroplastics with regard to mechanical, thermical and chemical (corrosive) influences (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 200-212 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100607
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  • 51
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    Einsatz des Explosivschweißens zur Herstellung von Edelmetallplattierungen (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 191-200 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Explosive Welding as a Technique for Cladding of Precious MetalsThe method of explosive welding and the importance of the cladding parameters are described. The “Explosive Weldability Window” is experimentally determined for the material combination AgCu 10/Fe. The behaviour of explosive claddings produced under different conditions during rolling is investigated.Best results are obtained with samples with a wavy interphase, produced under the following cladding parameters: \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {10^ \circ \le \beta \le 18^ \circ} \\ {1400 \le {\rm v}_{\rm K} \le 2600{{\rm m} \mathord{\left/ {\vphantom {{\rm m} {\rm s}}} \right. \kern-\nulldelimiterspace} {\rm s}}} \\ \end{array} $$\end{document}It is shown, that in comparison with conventional methods explosive cladding has advantages both in processing and quality.
    Notes: Die Grundlagen des Explosivschweißens werden geschildert und die Bedeutung der Plattierparameter aufgezeigt. Das „Explosive Weldability Window“ wird für die Werkstoffpaarung AgCu 10/Fe experimentell entwickelt.Das Verhalten der bei unterschiedlichen Bedingungen hergestellten Explosivplattierungen beim Auswalzen wird untersucht. Die besten Ergebnisse werden für Verbindungen mit welliger Verbindungsfläche erzielt, die mit den Plattierparametern \documentclass{article}\pagestyle{empty}\begin{document}$$ \begin{array}{*{20}c} {10^ \circ \le \beta \le 18^ \circ} \\ {1400 \le {\rm v}_{\rm K} \le 2600{{\rm m} \mathord{\left/ {\vphantom {{\rm m} {\rm s}}} \right. \kern-\nulldelimiterspace} {\rm s}}} \\ \end{array} $$\end{document} hergestellt werden.Es wird gezeigt, daß gegenüber konventionellen Verfahren das explosive Plattieren verfahrenstechnische und qualitative Vorteile hat.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100606
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  • 52
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    Das Sinterformteil - Herstellung Eigenschaften - und sein Einsatz zur Einsparung von Rohstoffen und Energie in der verarbeitenden Industrie (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 213-220 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Sintered Structural Part - Manufacturing, Properties and its Application for Saving Raw Material and Energy in the Engineering Industry.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100608
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  • 53
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    Prozeßrechner als Meßmittel beim Lichtbogenschweißen (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. 220-220 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Process Computer as Measuring Instrument at Arc Welding
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100609
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  • 54
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    Masthead (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979) 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100701
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  • 55
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    Nachrichten - Hinweise (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A53 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100610
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  • 56
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    Nachrichten - Hinweise (1979)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 10 (1979), S. A56 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19790100702
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  • 57
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    Analysis of polynuclear aromatic hydrocarbons by glass capillary gas chromatography using simultaneous flame ionization and electron capture detection (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 22-26 
    Details
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; Capillary, glass ; Environmental specific trace analysis ; FID/ECD response ratios for PNA's ; PNA identification evidently improved ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The possibility of simultaneous application of an electron capture (ECD) and a flame ionization detector (FID) connected to a glass capillary column for analyzing polynuclear aromatic hydrocarbons (PNA) has been investigated. The ECD/FID ratio is determined for 46 PNA compounds. The ratios vary from 0.02 to 117 with relative standard deviations better than 20 percent determined from 10 replicate analyses. The results suggest that the method may be used for obtaining additional evidence in identifying PNA in environmental samples.Impurities and transformation products in the standard were identified by computerized glass capillary gas chromatography/mass spectrometry. Quinones and diones are responsible for the high EC-response determined in some trace components in the standard.An application of the method is shown for PNA from particulates in urban atmospheres.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020108
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    Thermodynamic interactions of polypropylene, poly(vinylidene chloride), sulphonyldiphenyl formaldehyde resin and poly(vinyl pyrrolidone) as stationary phases in GLC with some selected solvents (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 27-30 
    Details
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; Thermodynamic properties measured, interaction energy vapour polymers ; Precise Vgº-data measured ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The interaction energies (X1) between the polymers polypropylene, poly(vinylidene chloride), sulphonyldiphenyl formaldehyde resin and poly(vinyl pyrrolidone) and the solvents toluene, ethylbenzene, isopropylbenzene, ortho, meta, and para-xylene are determined by gas chromatography. As shown in earlier publications, this technique for the determination of X1, can be extended to similar systems of theoretical as well as of practical importance, although the selection of the present systems was primarly made on the fact that these systems are of industrial interest and have not so far been investigated by gas-liquid chromatography. The studies were carried out at two temperatures and the results obtained show a decrease of X1 with an increase of temperature.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020109
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  • 59
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    Deactivation of glass capillary columns by silylation. Part 1: Principles and basic technique (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 31-35 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Surface deactivation, silylation ; Inertia stable to 350° ; Free acids and bases, simultaneous injection ; On-column injection ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A deactivation procedure is described based on a published method using hexamethyldisilazane in the gas phase. In addition to unusually high inertia and thermostability, the method produces truly neutral columns which allow simultaneous analysis of moderately strong free acids and bases. The silylated columns show their full potential only with on-column injection. Preliminary experimental directions are given; more elaborate directions will become available after extended optimization work.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020110
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  • 60
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    Systematic and statistical errors in quantitative evaluation in TLC and HPTLC. 3. The determination of the primary statistical errors (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 36-38 
    Details
    ISSN: 0935-6304
    Keywords: Thin-Layer Chromatography, TLC, HPTLC ; Error analysis for quantitation chromatographic and sampling error often largest ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The paper describes the measurement and calculation of the primary statistical errors in the evaluation of TLC or HPTLC using in situ reflectance measurements. The primary errors are the errors of the sample volume spotted onto the plate, errors caused by the chromatographic process itself, the positioning error of the plate with respect to the centre of the light beam and the error in the light measurement. By scanning the same spot, the same track or the same plate under different conditions, the various errors can be determined.
    Additional Material: 5 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020111
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    On-line hydrogenation of fatty acid methyl esters in capillary gas chromatography (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 43-44 
    Details
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; Capillary, glass ; Fatty acid methyl esters structure analysis ; On-line hydrogenation, platinum catalyst precolumn ; 10-8ϕ in complicated natural mixtures ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An injection splitter in front of a glass capillary column was used for the hydrogenation of fatty acid methyl esters (FAME) mixtures. Hydrogenation followed by gas chromatographic analysis on capillary columns permitted detection and identification in complicated natural mixtures of branched fatty acids, showing minor structural differences, in quantities down to 10-8g.The technique described, apart from its suitability for FAME analysis, shows promise for structure determination studies of other classes of compounds.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020113
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  • 62
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    The theory of wide initial bands in chromatography (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 45-47 
    Details
    ISSN: 0935-6304
    Keywords: Chromatography, theory ; Plate number calculation corrected for wide initial peaks ; Direct method of correction factor calculation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020114
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    High-temperature (GC)2/MS investigations (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 343-350 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Analysis up to C50 in GC/quadrupole MS combination ; No special procedures necessary when using commercially available instruments ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The analysis of low volatile compounds by (GC)2/MS using high-temperature stable glass-capillary columns and a commercially available GC/quadrupole MS instrument is described.It will be shown that no special modifications or procedures are required in analyzing organic compounds exceeding carbon numbers of 50. The application to industrially and naturally occuring high boiling mixtures will be discussed.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020616
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    An investigation of glasses for capillary chromatography (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 351-356 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Potash soda lead and fused silica as wall material investigated ; Thin-walled fused silica is an ideal material ; Inherently more inert than normal glass ; High flexibility avoids fragility problems ; Application examples (alcohols, mercaptanes, sulfides, phenolsamines, acids) ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An investigation was conducted of various glasses, other than soda lime or borosilicate, for use in glass capillary gas chromatography. The work has uncovered some unique chromatographic qualities in the use of potash soda lead and fused silica glasses as materials for making glass capillary columns. The fused silica proved to be an ideal material for capillary column construction, being inherently more inert than glass containing metal oxides. It has been shown that through the use of thin wall capillary tubing of high flexibility many of the mechanical problems associated with glass capillary columns, such as fragility and column straightening, can be avoided.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020617
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    Stationary phases for gas chromatography; chemical stability of polysiloxanes (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 405-410 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Stationary phases of polysiloxane-type degrade in acidic solution ; Several salt traces affect stability at high temperature NaCl on Duran-5O: no effect at 260°C ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A number of polysiloxanes have been shown to be sensitive to acids when dissolved in chloroform.At 26O°C polysiloxanes were found to degrade under the influence of several compounds used or produced during the preparation of glass capillary columns.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020707
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  • 66
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    Errata (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 90-90 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020214
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  • 67
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    A new surface roughening method for glass capillary columns. Sodium chloride deposition from suspension (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 447-455 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Surface roughening by direct deposition of suspension particles ; NaCl used ; High reproducibility when coated with polar phases ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method is described for roughening the surface of glass capillary columns for subsequent coating with polar stationary phases. A suspension of sodium chloride, obtained by addition of a saturated solution of sodium chloride in methanol to 1,1,1-trichloroethane, is passed through the column at velocities of 1-5 cm/s. During passage of the suspension, particles of sodium chloride deposit spontaneously on the column wall. The amount of sodium chloride deposited on the column wall is a function of the volume of the suspension passed through and of the contact time of the suspension and the column wall. Ultimately the amount of sodium chloride per unit surface area approaches a maximum. Columns covered with this maximum amount of sodium chloride were prepared with high reproducibility and coated with a number of polar stationary phases. Various factors that influence the stability of the suspension and the deposition of sodium chloride are discussed and minimum requirements are given. A theoretical model is proposed for the mechanism of deposition of sodium chloride particles on the glass wall.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020715
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  • 68
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    Systematically wrong evaluation of columns, packings, instrument-data in chromatography? (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 91-92 
    Details
    ISSN: 0935-6304
    Keywords: Data evaluation, peak width measurements in GC, LC, TLC ; Peaks are in principle non symmetric, non Gaussian shaped ; Standard deviation and variance cannot be measured directly as usual ; Systematic error easily larger than 50% ; Calculation of correct standard deviation/variance presented ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020215
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  • 69
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    Variance of non gaussian and asymmetric peaks in chromatography (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 93-94 
    Details
    ISSN: 0935-6304
    Keywords: Chromatography Theory peak shape, mathematical basis of real standard deviation and variances are much larger than “measured” ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020216
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  • 70
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    Chromatography calendar (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 101-101 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020218
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  • 71
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    Masthead (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020301
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  • 72
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    Masthead (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020901
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  • 73
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    High resolution gas chromatography/mass spectrometric characterization of urinary metabolites of N,N-diethyl-m-toluamide (DEET) in man (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 558-562 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography / electron impact (EI) and chemical ionization (CI) / mass spectrometry ; N,N-diethyl-m-toluamide ; Characterization of urinary metabolites of DEET in man ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Studies of the pharmacology and toxicology of the popular insect repellant, N,N-diethyl-m-toluamide (DEET), have largely been done in animal models using radioactive tracing without the structural elucidation of its metabolites.This paper describes a high resolution gas chromatography/mass spectrometry (GC/MS) technique and reports the results of the preliminary characterization of the metabolites of DEET in the urine of a 30-year-old man who had been exposed to DEET contained in a commercial product. The metabolites were extracted and separated with an OV-101 glass capillary column, 30 m × 0.3 mm, and mass spectrometric elucidations were carried out with both Electron Impact (EI) and Chemical Ionization-Methane (MCI) modes.Oxidation of the benzylic moiety and hydroxylation of the sidechain of DEET molecules appeared to be the predominate routes of metabolism in man. The artifacts were also proposed.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020904
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  • 74
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    Apparatus and technique for preparation of high performance support and packings for gas chromatography (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 577-578 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; support and packing production technique and device ; drying, removal of fines, silanization, solution coating, total evaporation ; in one system ; normal transport results in partial mechanical partlkel damage, causing tailing, decomposition on uncoated surfaces ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020908
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  • 75
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    Fluorimetric determination of sugars on HPTLC plates (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 585-585 
    Details
    ISSN: 0935-6304
    Keywords: High-performance thin-layer chromatography, HPTLC ; Sugar determination by fluorescence ; Detection limit ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020913
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  • 76
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    Product news (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 592-594 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020918
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  • 77
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    Comparison of optical in-situ scanning of conventional and high-performance thin-layer chromatograms (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 133-140 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer Chromatography, TLC/HPTLC ; Quantitation by optical in-situ scanning ; Comparison of conventional and HPTLC techniques ; Peripheral quantitized circular HPTLC superior ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Conventional TLC, linear and circular HPTLC are compared by using In-situ reflectance measurements. Chromatographic resolution, time requirement and reproducibility of quantitative scanning of the different TLC methods are investigated by means of three separation problems: benzodiazepines, corticosteroids, polycyclic aromatic hydrocarbons.In all three application examples, which were chosen without prejudice, the circular developing mode with subsequent quantitative scanning showed certain advantages over the corresponding linear HPTLC techniques. These were in the case of Benzodiazepines: Better reproducibility of quantitative assessment.Corticosteroids: Better resolution and slightly better quantitative reproducibility.Polycyclic aromatic hydrocarbons: Chromatography considerably faster.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020306
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  • 78
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    Glassy surfaces as support phases in gas-liquid chromatography (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 703-711 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240021202
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  • 79
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    On the applicability of the “abt” concept (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 720-722 
    Details
    ISSN: 0935-6304
    Keywords: Chromatography, theory ; Peak width as a function of retention time and capacity ratio “abt” concept ; Real plate height and theoretical plate height Extra-column contributions to band broadening and “abt” concept ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Kaiser's “abt” concept rests on the experimental establishment of a linear relation between band width at half height, b0.5, and capacity ratio, k, according to \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm b}_{{\rm 0}{\rm .5}} = {\rm b}_{\rm o} + {\rm ak} $$\end{document} His column specification quantity, hreal, is dependent on the square of the slope a, obtained from a linear regression analysis based on this relation. It is shown in the present paper that an improvement of the experimental conditions leading to a lower extra-column contribution to band broadening, bex2, introduces a tendency towards a negative curvature in the plot at low k values. The mean slope increases, and an uncritical linear regression would yield an hreal-value which is higher than before and which would be in the opposite direction to the requirements of a reliable column specification. Generally the linear regression analysis has to be moved to higher k regions in cases of curvature, especially as it is also shown that hreal is an estimation of the traditional HETP value, H∞, that would be obtained when k approaches infinity. This theoretically expected relation \documentclass{article}\pagestyle{empty}\begin{document}$$ {\rm h}_{{\rm real}} = {\rm H}_\infty $$\end{document} is a strong motivation for the use of hreal as a column specification, since the b0.5-value associated with H∞ is expected to be practically independent of bex2.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240021205
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  • 80
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    Determination of dichloroacetic acid in plasma and urine (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 749-750 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Packed column, glass ; Dichloroacetic acid ; In biological fluids, at 50 ng level ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A method for the measurement of dichloroacetic acid in plasma or urine has been developed. The method involves extraction of dichloroacetic acid into diethyl ether, evaporation of the etheric phase to a small volume and derivatization with diazomethane. Trichloroacetic acid was used as an internal standard. Concentrations as low as 50 ng/ml can be determined.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240021211
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  • 81
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    Trace elements in HPLC silica gel (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 151-153 
    Details
    ISSN: 0935-6304
    Keywords: Liquid Chromatography, HPLC ; Stationary phase carrier silicagel analysis and cleaning treatment ; 0.3% metal traces may interfere ; Elution by boiling 1-12 N HCl does not attack C18 bonding in reverse phase material, extracts metals sufficiently ; Effective phase quality test by hop-α-acid chromatogram ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Trace elements in different silica gels are determined by neutron activation analysis. The presence of 20 elements in the ppm range and of 15 elements in the ppb range is established in all silica gels; even in spherical material probably obtained via an organosilicium starting material. Removal of these elements by acid treatment before and after derivatization to a reversed-phase is studied. This is only partially effective. The resulting HPLC phases are, however, much better in cases where trace elements are detrimental. Even octadecyl derivatized silicagel can withstand boiling in 12 N hydrochloric acid without loosing significant amounts of bonded organic material.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020311
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  • 82
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    Symposia Announcements (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 156-159 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020314
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  • 83
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    Chromatography calendar (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 155-155 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020313
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  • 84
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    Masthead (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979) 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020401
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  • 85
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    Polar phase glass capillary GC columns for hormonal steroid analysis: OV-17 (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 187-188 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Whiskers, OV-17 ; Steroid profiling ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020407
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  • 86
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    Gradient elution under hydrostatic equilibrium in liquid chromatography. Part 1 (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 164-171 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, gradient technique ; Mobile phase composition programming by hardware construction ; Effluent composition curve analysis ; Numerical method for calculation and theory discussed ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The theory of gradient elution under hydrostatic equilibrium is developed for the case where only one reservoir and one mixing chamber are used and where both solvents have equal densities. Given the shapes of the two vessels, effluent concentration curve equations are deduced for different mixing chamber-reservoir combinations. On the other hand, given the equation for the effluent concentration curve, the reservoir cross-sectional area, as a function of height, can be deduced when the mixing chamber has a constant cross-section. The varying cross-section of the reservoir is accomplished by inserting thin discs of different areas on top of one another inside a regular vessel of constant cross-section.Except for complicated gradients, a given gradient can be accomplished using a reservoir with a cross-sectional area which varies linearly with height. In the case of complex gradients, a reservoir having two or more linear segments becomes necessary. A numerical method is given for the calculation of the continuously varying reservoir cross-section for the exact duplication of a given gradient.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020402
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  • 87
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    Determination of triphenyltin hydroxide derivatives by capillary GC and tin-selective FPD (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 189-190 
    Details
    ISSN: 0935-6304
    Keywords: Gas Chromatography ; Capillary, glass ; Tin-selective FPD ; Triphenyltin hydroxide ; TPTH ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: A new method for the determination of triphenyltin hydroxide using capillary column gas chromatography with a tin-selective flame photometric detector has been developed. Triphenyltin hydroxide and its potential metabolites are converted to methyl derivatives and separated on glass capillary columns coated with OV-101. Derivatization of triphenyltin hydroxide, triphenyltin chloride, diphenyltin dichloride, phenyltin trichloride, and bis-triphenyltin oxide is nearly quantitative with a minimum of redistribution products. The selectivity of the flame photometric detector is cearly demonstrated by the comparison of chromatographic profiles obtained from using both the flame photometric and flame ionization detectors.The use of this chromatographic system in the analysis of triphenyltin hydroxide in a fortified water sample demonstrates the potential use of this system in organotin residue chemistry.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020408
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  • 88
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    Estimation of extra-column contributions to band broadening in capillary columns (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 191-192 
    Details
    ISSN: 0935-6304
    Keywords: Chromatography, theory ; Extra-column Contribution ; Band broadening “abt” concept ; Taylor equation ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020409
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  • 89
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    The determination of peak purity in HPLC by factor analysis of scanned absorption spectra (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 197-198 
    Details
    ISSN: 0935-6304
    Keywords: Liquid chromatography, HPLC ; Absorption spectra ; Absorbance ratioing ; Factor analysis ; Principal components analysis ; Peak homogeneity ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020412
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  • 90
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    Separation of amniotic fluid phospholipids by one-dimensional TLC (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 199-200 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC ; Phosolipid separation, L/S ratio determination ; Quantitation above 100 ng, optimized ; Cupric acetate-phosphoric reagent superior to 3 other reagents ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020413
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  • 91
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    Instrument and product news (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 201-204 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020414
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  • 92
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    Summaries (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 210-210 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020502
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  • 93
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    Sample capacity in open tubular and micro-packed columns for GC (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 444-446 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Micropacked columns ; Sample capacity under comparable conditions forty times larger than in capillaries ; Equations given ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Equations have been derived from which the maximum sample size which may be loaded on a column without significantly affecting the performance may be calculated. It is shown that micro-packed columns can handle a sample which is as much as forty times larger than that which can be loaded onto wall-coated open tubular columns with comparable conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020714
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  • 94
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    Chromatographic peak broadening with a lab-made splitter: Reproducibility and accuracy studies (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 481-486 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Splitting conditions for quantitative sampling investigated ; Injection amount and temperature should remain constant ; Standard deviation below 1% ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Sample inlet splitters are used in capillary column gas chromatography. We have investigated the sample band broadening in the splitter and studied reproducibility and accuracy in quantitative analysis using a simple lab-made splitter. It was found that the results were dependent upon the operating conditions such as split ratio, splitter temperature, glass wool plug, injected sample volume and solvent.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020719
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  • 95
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    Quantitative evaluation of thin-layer chromatograms. 1. The calculation of remission and transmission using multilayer models (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 517-523 
    Details
    ISSN: 0935-6304
    Keywords: Thin-layer chromatography, TLC, HPTLC ; Photometric scanning ; Radiation transfer equation ; Multilayer model (10 layers) ; Remission ; Transmission ; Sample concentration ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Quantitative evaluation of TLC by direct photometric scanning is a promising method, in view of the development of cheap microprocessors: soon instruments for digital scanning will be commercialy available. In this paper we describe a multilayer model which seems to be a good approximation for solving the radiation transfer equation in the case of layer models with a gradient in an inward direction. Changes of remitted and transmitted light, in cases where a band lies in different layers, are presented. Examples shown are: the absorbance profile of a chromatographed band in the direction of scanning is approximated to that of an isosceles triangle; the concentration of the band is uniform, e.g. 0.3 A. U.; the concentration of the band is changing from 0 to 2.0 A. U. These results will serve to set up the correct algorithms for digital scanning and simultaneous determination in TLC.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020806
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  • 96
    Electronic Resource
    Electronic Resource
    Micro-apertures. An inexpensive and accurate method of achieving flow stability (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 533-534 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Flow stabilization ; Gas velocity in micro-apertures ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020811
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  • 97
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    Correlations between chemical structure and k-value in the TLC of epimeric 3-ethinyl-3-cholestanoles (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 535-536 
    Details
    ISSN: 0935-6304
    Keywords: Structure/k-value relations in TLC ; Epimeric 3-ethinyl-3-cholestanoles ; Influence of the composition of the mobile phase on Rf-values ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The chromatographic behaviour of TLC on silica gel of 3 pairs of epimeric 3-ethinyl-3-cholestanoles is described.It is found that the k-values of this class of compounds are predominantly influenced by the stereochemical orientation of the hydroxyl group. 3-Ethinyl-3-cholestanoles with β-configuration of the hydroxyl group have larger k-values than their α-oriented epimers.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020812
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  • 98
    Electronic Resource
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    Design of a microprocessor-controlled automated injection system for the analysis of gas phase cigarette smoke using glass capillary columns (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 551-557 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Organic gas phase cigarette smoke ; Microprocessor-controlled ; Cryogenic preconcentration trap ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: An automatic injection system for the analysis of gas phase smoke has been designed and evaluated using the microprocessor-controlled Hewlett-Packard 5830 gas chromatograph. The cryogenic preconcentration trap was constructed from relatively inexpensive and readily available materials. It was determined that the use of the preconcentration trap, as opposed to condensing the smoke on the head of the cold (-50°C) chromatographic column, significantly enhanced the resolution of the more volatile gas phase components. Data are presented which illustrate the injection system characteristics. In addition, chromatograms of gas phase smoke are presented which demonstrate the effectiveness of this technique.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020903
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  • 99
    Electronic Resource
    Electronic Resource
    Analysis of nitrosamines by GC2 with a photoionization detector (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 475-480 
    Details
    ISSN: 0935-6304
    Keywords: Gas chromatography ; Capillary, glass ; Photoionization detector (PID) ; Detection limit 50 to 100 pg nitrosamines at 10.2 eV ; Nitrosamine analysis ; Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The use of a photoionization detector (PID) coupled to a glass capillary gas chromatography (GC2) separation system for the detection of carcinogenic nitrosamines was investigated. The components analyzed gave a linear response with a lower detection limit of 50 to 100 pg with the 10.2 eV ionization source. No detector response was obtained with an ionization energy of 9.5 eV.Chromatography of meat extracts indicated their complex molecular composition. Simple liquid chromatographic cleaning procedures significantly decreased the complexity of these samples, but not sufficiently for the accurate quantition of nitrosamine components.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240020718
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  • 100
    Electronic Resource
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    Summaries (1979)
    Weinheim : Wiley-Blackwell
    Journal of High Resolution Chromatography 2 (1979), S. 597-598 
    Details
    ISSN: 0935-6304
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jhrc.1240021002
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