Results 191 to 200 of about 20,821 (225)
Transfer of graded potentials at the photoreceptor-interneuron synapse. [PDF]
To characterize the transfer of graded potentials and the properties of the associated noise in the photoreceptor-interneuron synapse of the blowfly (Calliphora vicina) compound eye, we recorded voltage responses of photoreceptors (R1-6) and large monopolar cells (LMC) evoked by: (a) steps of light presented in the dark; (b) contrast steps; and (c ...
Mikko A Juusola
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Microscopy Research and Technique, 2000
The photoreceptor population in Xenopus consists of a green-sensitive rod (lambda(max) = 523 nm), a blue-sensitive rod (lambda(max) = 445 nm) and three classes of cone. The largest cone is red-sensitive (lambda(max) = 611 nm). The intermediate cone is presumed to be blue-sensitive based on physiological criteria, whereas the miniature cone may be UV ...
Paul Witkovsky
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The photoreceptor population in Xenopus consists of a green-sensitive rod (lambda(max) = 523 nm), a blue-sensitive rod (lambda(max) = 445 nm) and three classes of cone. The largest cone is red-sensitive (lambda(max) = 611 nm). The intermediate cone is presumed to be blue-sensitive based on physiological criteria, whereas the miniature cone may be UV ...
Paul Witkovsky
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Myosin V in the Retina: Localization in the Rod Photoreceptor Synapse
Experimental Eye Research, 1996Brain myosin V is a member of a class of unconventional myosins. Using antibodies against brain myosin V, its distribution in the rat retina has been examined. It was detected in the inner and outer plexiform layers, in the somas of cells forming the inner nuclear layer, and in the ganglion cell layers.
C L, Schlamp, D S, Williams
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Fly photoreceptor synapses: Their development, evolution, and plasticity
Journal of Neurobiology, 1989AbstractRecent studies are reviewed on the synapses of photoreceptor terminals in the first optic neuropile of the flies, Musca and Drosophila. Afferent synaptic contacts are of uniform dimensions; they have a postsynaptic tetrad with a membrane organization of P‐face particles, resembling other inhibitory synapses.
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Photoreceptor synapses degenerate early in experimental choroidal neovascularization
Journal of Comparative Neurology, 2005AbstractSevere visual loss in patients with age‐related macular degeneration is associated with the development of choroidal neovascularization (CNV). The pathogenic mechanisms for CNV formation have been extensively investigated, but remarkably little research has addressed the mechanisms for dysfunction of the retina in CNV.
Alejandro, Caicedo +4 more
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Parallel Processing in Two Transmitter Microenvironments at the Cone Photoreceptor Synapse [PDF]
A cone photoreceptor releases glutamate at ribbons located atop narrow membrane invaginations that empty onto a terminal base. The unique shape of the cone terminal suggests that there are two transmitter microenvironments: within invaginations, where concentrations are high and exposures are brief; and at the base, where concentrations are low and ...
Wei Li, Steven DeVries
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Structure and Development of the Photoreceptor Ribbon Synapse
2014Photoreceptor cells are sensory neurons and does not possess dendrites, whereas photoreceptor axonal terminals develop a specialized synaptic structure called ribbon synapses that contains electro-dense horseshoe-like ribbons. Photoreceptor ribbon synapses have connections with dendritic terminals of bipolar cells and tips of horizontal cell processes,
Yoshihiro Omori, Takahisa Furukawa
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Development of Opsin and Synapses in Monkey Photoreceptors
1995Primate vision is characterized by high acuity and color perception, each of which originate in cone photoreceptors. Visual sensitivity resides in rod photoreceptors. Adult Macaca monkey retina contains an average of 2.9–3.5 million cones and rods average 60.1 million with considerable individual variation1. Macaca retinal topography is centered on the
A. Hendrickson +3 more
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Localization of glutamate receptors at a complex synapse. The mammalian photoreceptor synapse.
Cell and tissue research, 2001A key feature of signal processing in the mammalian retina is parallel processing, where the segregation of visual information, e.g., brightness, darkness, and color, starts at the first synapse in the retina, the photoreceptor synapse. These various aspects are transmitted in parallel from the input neurons of the retina, the photoreceptor cells ...
J H, Brandstätter, I, Hack
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Molecular dynamics of photoreceptor synapse formation in the developing chick retina
Journal of Comparative Neurology, 2007AbstractThe cellular and molecular mechanisms underlying photoreceptor synaptogenesis are poorly understood. Furthermore, a detailed picture of the molecular composition of photoreceptor synapses, or their subtypes, is not yet available, nor do we know what differences, if any, exist among those subtypes.
Karl J, Wahlin +4 more
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