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  • 1
    Electronic Resource
    Electronic Resource
    Pressure-induced phase transition in solid hydrogen sulfide at 11 GPa (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 2036-2040 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Raman spectra of hydrogen-bonded molecular solid H2S have been measured up to 23 GPa at 300 K in a gasketed diamond-anvil cell. In the orientationally disordered phase I between 0.47 and 11 GPa, the symmetric stretching mode ν1 shows a red-shift in frequency (dν1/dP=−10.1 cm−1/GPa ) and a dramatic broadening with pressure. At about 11 GPa, the antisymmetric stretching band ν3 appears at the higher-frequency side of ν1. Near this same pressure five low-frequency vibrational modes also appear and show pressure-sensitive features. These results indicate a pressure-induced phase transition near 11 GPa. This new solid phase, which persists to at least 23 GPa at 300 K, seems to be the same phase as previously found above 3.3 GPa at 25 K.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461002
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  • 2
    Electronic Resource
    Electronic Resource
    TONIC CONTROL OF SUBRETROFACIAL VASOMOTOR NEURONS IN THE ROSTRAL VENTROLATERAL MEDULLA (1991)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 18 (1991), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Vasomotor pressor neurons in the subretrofacial nucleus of the rostral ventrolateral medulla receive afferent inputs from different sources that utilize different neurotransmitters. This paper briefly reviews recent studies on the role of inputs releasing: (i) GABA, and (ii) angiotensin II (AII) in the subretrofacial nucleus.2. There are two types of tonic GABAergic inhibitory inputs: one arises from peripheral baroreceptors, while the second is independent of peripheral baroreceptors.3. Blockade of receptors for AII elicits a decrease in blood pressure and sympathetic vasomotor activity, indicating that subretrofacial neurons are also tonically excited by AII. It is likely that the AII is released from nerve terminals in the subretrofacial nucleus, but the origin of the pathway is unknown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1991.tb01415.x
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  • 3
    Electronic Resource
    Electronic Resource
    Age-dependence of susceptibility to carcinogenesis by ionizing radiation in mice (1991)
    Springer
    Radiation and environmental biophysics 30 (1991), S. 205-207 
    Details
    ISSN: 1432-2099
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01226620
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  • 4
    Electronic Resource
    Electronic Resource
    Immunohistochemical expression of amelogenins in odontogenic epithelial tumours and cysts (1991)
    Springer
    Virchows Archiv 418 (1991), S. 319-325 
    Details
    ISSN: 1432-2307
    Keywords: Amelogenin ; Odontogenic tumour ; Immunohistochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Amelogenins, enamel proteins in odontogenic tumours, were detected immunohistochemically using a monoclonal antibody. They were strongly expressed in amyloid-like material, ghost cells, and the cells surrounding ghost cells of calcifying epithelial odontogenic tumours and cysts, whereas calcified bodies within the tumours and cysts showed negative staining. The expression of amelogenins was also positive in tumour cells of ameloblastoma, adenomatoid odontogenic tumour, squamous odontogenic tumour and ameloblastic fibroma. Peripheral tumour cells of the follicular ameloblastoma were positive with relatively intense staining. Undifferentiated or flattened tumour cells of adenomatoid odontogenic tumour and non-keratinized tumour cells of the squamous odontogenic tumour showed marked staining. Reduced ameloblasts in the odontoma displayed the strongest staining for amelogenins. The study suggests that biosynthesis of amelogenins may occur in the homogeneous materials of calcifying epithelial odontogenic tumours and cysts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01600161
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  • 5
    Electronic Resource
    Electronic Resource
    Determination of ternary-system cation distribution in (Co,Ni,Zn)SiO3 pyroxene employing two-wavelength anomalous dispersion with synchrotron radiation (1990)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 493-497 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768190003755
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  • 6
    Electronic Resource
    Electronic Resource
    Diffraction effect of X-ray diffuse scattering in a disordered Cu–Al alloy (1990)
    [S.l.] : International Union of Crystallography (IUCr)
    Acta crystallographica 46 (1990), S. 923-929 
    Details
    ISSN: 1600-5724
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: A white (defect) line which appears as a dip in intensity distribution was clearly observed in the 200 diffuse scattering from a Cu-Al disordered crystal at room temperature in the Bragg geometry by using both photographic and counter methods. The line is caused by the extinction effect on the 200 Bragg reflection, subsequent to the diffuse scattering, in a process similar to the case of mosaic crystals. The diffuse scattering is caused by the static displacement as well as the thermal motion of atoms. The observed contrast of the line is quantitatively in fair agreement with that calculated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108767390007474
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  • 7
    Electronic Resource
    Electronic Resource
    Immunocytochemical and ultrastructural studies of hyaline inclusions in sporadic motor neuron disease (1991)
    Springer
    Acta neuropathologica 82 (1991), S. 295-301 
    Details
    ISSN: 1432-0533
    Keywords: Hyaline inclusions ; Motor neuron disease ; Amyotrophic lateral sclerosis ; Immunocytochemistry ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary We investigated hyaline inclusion bodies (HI) immunocytochemically and ultrastructurally in six cases of sporadic motor neuron disease (MND). All HI contained large amounts of ubiquitin and some HI were stained at the core or the center with anti-neurofilament antibody, with the surrounding halo unstained. No HI were stained with antibodies raised against cytoskeletal proteins such as high-molecular weight microtubule-associated proteins and phosphorylated tau. Ultrastructurally, HI were chiefly composed of filaments measuring about 20 nm in diameter thicker than neurofilaments, and contained fine granules and frequently one or more of four characteristic profiles, i.e., small electron-dense materials resembling Bunina bodies, bundles of tubular filaments measuring approximately 20 nm in diameter, large electron-dense cores, and focal accumulations of randomly arranged neurofilaments. Hyaline inclusions can be regarded as one of the characteristic markers for sporadic MND as well as familial amyotrophic lateral sclerosis. Hyaline inclusions have a markedly heterogeneous ultrastructure and, therefore, differences in immunoreactivity with antineurofilament antibodies are not unexpected.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00308815
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  • 8
    Electronic Resource
    Electronic Resource
    An autopsy case of human T lymphotropic virus type I-associated myelopathy (HAM) with a duration of 28 years (1990)
    Springer
    Acta neuropathologica 81 (1990), S. 219-222 
    Details
    ISSN: 1432-0533
    Keywords: HTLV-I ; Tropical spastic paraparesis ; Chronic progressive myelopathy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary An autopsy case of human T lymphotropic virus I-associated myelopathy (HAM) of a duration of 28 years in a 61-year-old man with serological confirmation of HTLV-I infection was reported. The spinal cord was grossly atrophic. There was severe symmetrical degeneration of the lateral funiculi, particularly of the bilateral pyramidal tracts, involving all levels of the spinal cord, but anterior horn cells were relatively well preserved. In the most severely damaged middle and lower thoracic segments, the white matter degeneration also involved the anterior funiculi. In the degenerated white matter, both the myelin and axons were equally lost and had been replaced by glial scars. Marked adventitial fibrosis was commonly seen in small parenchymal vessls in both the white and gray matter. Although there was no evidence of inflammation in the spinal cord, mild lymphocytic infiltration was occasionally observed in the subarachnoid and perivascular spaces in the brain stem, cerebellum and cerebrum. This case was considered as a burnt-out case of HAM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00334512
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  • 9
    Electronic Resource
    Electronic Resource
    The neuronal organization of horizontal semicircular canalactivated inhibitory vestibulocollic neurons in the cat (1991)
    Springer
    Experimental brain research 86 (1991), S. 9-17 
    Details
    ISSN: 1432-1106
    Keywords: Horizontal semicircular canal ; Vestibularnuclei ; Vestibulo-collic ; Neck motoneuron ; HRP ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1.The somatic location and axonal projections of inhibitory vestibular nucleus neurons activated by the horizontal semicircular canal nerve (HCN) were studied in anesthetized cats. Cats were anesthetized with ketamine hydrochloride and pentobarbital sodium. 2.Intracellular recordings were obtained from 11 neck extensor motoneurons which were identified by antidromic activation from the dosai rami (DR) in the C1 segment. Stimulation of the ipsilateral (i-) HCN and the ipsilateral abducens (AB) nucleus evoked IPSPs in the motoneurons. These IPSPs were fully or partially occluded when they were evoked simultaneously. 3. Intracellular recordings were obtained from 8 AB motoneurons. Stimulation of the i-HCN and the i-C1DR motoneuron pool evoked IPSPs in the AB motoneurons. These IPSPs were also partially occluded when they were evoked simultaneously, which implied that some HCN-activated neurons inhibit both i-AB motoneurons and ipsilateral neck motoneurons. 4. Unit activity was extracellularly recorded from 30 vestibular neurons that were activated monosynaptically by i-HCN stimulation. Their axonal projections were determined by stimulating the i-AB nucleus and the i-C1DR motoneuron pool. Eight neurons were activated by both stimuli, and were termed vestibulooculo-collic (VOC) neurons. Their axonal branching was examined by means of local stimulation in and around the i-AB nucleus and the i-C1DR motoneuron pool. Eighteen neurons were antidromically activated from the i-C1DR motoneuron pool but not from the i-AB nucleus. These were termed vestibulo-collic (VC) neurons. Four neurons were activated from the i-AB nucleus but not from the ventral funiculus in the C1 segment, and were termed vestibulo-ocular (VO) neurons. The HCN-activated inhibitory neurons were mostly localized in the rostroventral part of the medial vestibular nucleus. 5. Horseradish peroxidase (HRP) was injected iontophoretically into descending axons of 2 HCN-activated inhibitory VOC neurons which were identified by stimulation of the i-HCN and the i-AB nucleus. Axon collaterals were ramified from a stem axon in the ventral funiculus, and entered the gray matter and spread in the laminae VIII and IX. Terminal boutons were distributed over the medial and the ventromedial parts of the vental horn in the C1 segment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00231035
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  • 10
    Electronic Resource
    Electronic Resource
    Monosynaptic excitatory connexions of reticulospinal neurones in the nucleus reticularis pontis caudalis with dorsal neck motoneurones in the cat (1990)
    Springer
    Experimental brain research 80 (1990), S. 277-289 
    Details
    ISSN: 1432-1106
    Keywords: Recticulospinal neurones ; Pons ; Neck ; Tectum ; Cortex ; Cat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary 1. Projections of reticulospinal neurones (RSNs) in the nucleus reticularis pontis caudalis (N.r.p.c.) to dorsal neck motoneurones supplying splenius (SPL, lateral head flexor) and biventer cervicis and complexus (BCC, head elevator) muscles were studied in the cat anaesthetized with pentobarbiturate or α-chloralose. 2. Threshold mapping for evoking antidromic spikes revealed that most of RSNs tested projecting down to brachial segments but not to lumbar segments (C-RSNs) gave off collaterals to the gray matter of the upper spinal cord in C2–C3 segments. 3. Spike triggered averaging showed that negative field potentials were evoked after firing of a single C-RSN (single fibre focal synaptic potentials, FSPs) in the region of C2–C3 where large antidromic field potentials from nerves supplying SPL or BCC muscles were evoked. The single fibre FSPs ranged between 1 and 10 μV in amplitude and had latencies between 0.7 and 1.2 ms from the onset of the triggering spike. In most cases, a presynaptic spike preceded the negative potential by 0.3 ms. These results indicated that C-RSNs project to the SPL or BCC motor nucleus. 4. Spike triggered averaging of postsynaptic potentials revealed EPSPs (single fibre EPSPs) in 36 dorsal neck motoneurones, predominantly in SPL (25) and less in BCC (11) motoneurones, evoked from 15 C-RSNs. The amplitude of the single fibre EPSPs ranged from 5 to 310 μV, and had latencies of 0.8–2.0 ms from the onset of the triggering spikes of C-RSNs, or 0.3–0.5 ms from the presynaptic spike when recorded. The results indicated monosynaptic excitatory connexions of C-RSNs to dorsal neck motoneurones. 5. Single fibre EPSPs from a C-RSN were usually recorded from either BCC or SPL motoneurones but not from both types of motoneurones, when tested in many motoneurones. This showed that connexions of C-RSNs with dorsal neck motoneurones were muscle specific. 6. RSNs projecting down to the lumbar segment (L-RSN) also showed branching in C2–C3 segments. Excitatory monosynaptic connexion of L-RSNs with neck motoneurones were demonstrated by recording single fibre postsynaptic population potentials (p.s.p.p.s.) from the C2 ventral root perfused with sucrose. The probability of evoking monosynaptic single fibre p.s.p.p.s. was less (19%) than for C-RSNs (59%).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00228155
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