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  • 1
    Electronic Resource
    Electronic Resource
    Light- and electron-microscopic study of substance P-immunoreactive neurons in the guinea pig retina (1995)
    Springer
    Cell & tissue research 281 (1995), S. 261-271 
    Details
    ISSN: 1432-0878
    Keywords: Amacrine cells ; Substance P ; Immunore-activity ; Synaptic circuitry ; Guinea pig
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Substance P (SP) immunoreactivity in the guinea pig retina was studied by light and electron microscopy. The morphology and distribution of SP-immunoreactive neurons was defined by light microscopy. The SP-immunoreactive neurons formed one population of amacrine cells whose cell bodies were located in the proximal row of the inner nuclear layer. A single dendrite emerged from each soma and descended through the inner plexiform layer toward the ganglion cell layer. SP-immunoreactive processes ramified mainly in strata 4 and 5 of the inner plexiform layer. SP-immunoreactive amacrine cells were present at a higher density in the central region around the optic nerve head and at a lower density in the peripheral region of the retina. The synaptic connectivity of SP-immunoreactive amacrine cells was identified by electron microscopy. SP-labeled amacrine cell processes received synaptic inputs from other amacrine cell processes in all strata of the inner plexiform layer and from bipolar cell axon terminals in sublamina b of the same layer. The most frequent postsynaptic targets of SP-immunoreactive amacrine cells were the somata of ganglion cells and their dendrites in sublamina b of the inner plexiform layer. Amacrine cell processes were also postsynaptic to SP-immunoreactive neurons in this sublamina. No synaptic outputs onto the bipolar cells were observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00583395
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Extraordinary behaviour of the Y1−x Pr x Ba2Cu3O7−δ system (1994)
    Springer
    Journal of superconductivity 7 (1994), S. 97-106 
    Details
    ISSN: 1572-9605
    Keywords: Y1−x Pr x Ba2Cu3O7−δ ; Y1−x M x Ba2Cu3O7−δ ; Hall effect ; magnetoresistance
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: Abstract Investigations of Y1−x M x Ba2Cu3O7−δ (M=Ce, Th)c-axis oriented thin film specimens show that the rate of depression ofT c withx is larger for M=Th, than for M=Ce and Pr, and suggest that Ce, like Th, is tetravalent in this compound. Hall effect measurements on Y1−x Pr x Ba2Cu3O7−δ single crystals reveal aT 2 dependence of the cotangent of the Hall angle in the normal state and a “negative Hall anomaly” belowT c in the superconducting state, in agreement with recent reports. Our research shows that the depth, Δ, of the negative Hall signal scales withT/T c and that the maximum value of Δ decreases linearly withx and vanishes atx≈0.24. Magnetoresistance measurements on Y1−x Pr x Ba2Cu3O7−δ single crystals indicate that the irreversibility lineH(T *) obeys a universal scaling relation characterized by anm=3/2 power law nearT c, with a crossover to a more rapid temperature dependence of belowT/T c ≈0.6, similar to that observed for polycrystalline specimens.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00730377
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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