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  • 1
    Electronic Resource
    Electronic Resource
    Effects of light and dark upon photoreceptor synapses in the retina of Xenopus laevis (1976)
    Springer
    Cell & tissue research 173 (1976), S. 211-220 
    Details
    ISSN: 1432-0878
    Keywords: Retina ; Xenopus laevis ; Photoreceptors ; Synaptic ribbons ; Dense-core vesicles
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Photoreceptor synapses in Xenopus retina were studied after exposure to day/night cycles and continuous light or dark. In the rods, dense-core vesicles appear alongside the synaptic ribbons in animals exposed to light. In dark-adapted rods, electron-dense material is present in the synaptic clefts, but no dense-core vesicles are found associated with the synaptic ribbons. Cone photoreceptors do not show these ultrastructural changes in response to light and dark. Prolonged exposure to light (21 days) causes flattening of the synaptic vesicles associated with the synaptic ribbons in both rods and cones. The results are discussed in the light of what is known about transmitter release from photoreceptors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221376
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  • 2
    Electronic Resource
    Electronic Resource
    Ultrastructural and pharmacological studies on the afferent synapse of lateral-line sensory cells of the African clawed toad, Xenopus laevis (1975)
    Springer
    Cell & tissue research 163 (1975), S. 239-247 
    Details
    ISSN: 1432-0878
    Keywords: Lateral-line ; Xenopus laevis ; Sensory cell ; Synaptic bar ; Neurotransmitters
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Lateral-line sensory cells of Xenopus show considerable similarity to central nervous system synapses in their responses to the zinc iodide-osmium tetroxide, and bismuth-iodide cytochemical staining techniques. Both reserpine and FLA-63 cause a reduction in the diameter and electron density of the synaptic bars, and a dramatic loss of synaptic vesicles surrounding the bars. Aminooxy acetic acid and 3-mercaptopropionic acid cause no significant changes in the sensory-cell afferent synaptic apparatus. The results are discussed in the light of the known effects of the drugs. It is concluded that a monoamine rather than an amino acid may act as the afferent transmitter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221730
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    Paper (German National Licenses)
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