Results 261 to 270 of about 64,303 (289)
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Properties of intact photoreceptor cells lacking synapses

Journal of Experimental Zoology, 1968
AbstractSurgically undamaged photoreceptor cells that have no connections with the central nervous system were obtained by transplanting the eye imaginal disc of third instar housefly larvae (Musca domestica) into the abdomens of host larvae and waiting for development of the host flies.
D M, Eichenbaum, T H, Goldsmith
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Calcium Homeostasis in Fly Photoreceptor Cells

2002
In fly photoreceptor cells, two processes dominate the Ca2+ homeostasis: light-induced Ca2+ influx through members of the TRP family of ion channels, and Ca2+ extrusion by Na+/Ca2+ exchange. Ca2+ release from intracellular stores is quantitatively insignificant.
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Photoreceptor cell specific proteins of snake pineal

Journal of Pineal Research, 1991
Abstract: The pineal body of lower vertebrates is saccular and directly photoreceptive. The pineal gland of mammals is parenchymal and not directly photoreceptive. The parenchymal morphology of snake pineal raises questions of direct photoreceptivity of snake pineal and of correspondence of molecular homology with morphological homology. S‐antigen and
C M, Kalsow   +6 more
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Photoreceptor-bipolar cell transmission

1995
Bipolar cells make direct synaptic contact with photoreceptors and form a ‘through’ pathway for information transmission in the retina before this is relayed to the higher visual centers of the brain. A high degree of processing of the visual signal occurs in the outer retina.
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Synaptic vesicle exocytosis in goldfish photoreceptor cells

Albrecht von Graefes Archiv f�r Klinische und Experimentelle Ophthalmologie, 1981
The photoreceptor cell endings of goldfish retinas were examined using ultrathin and freeze-fracture techniques. The synaptic vesicles could be seen lying closely packed in rows on each side of the synaptic ribbon, and the vesicles nearest to the end of the ribbon could be seen to be in direct contact with the presynaptic membrane.
M, Matsumura, S, Okinami, M, Ohkuma
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FUNCTIONAL ROLE OF CALCIUM IN PHOTORECEPTOR CELLS

Photochemistry and Photobiology, 1980
Abstract— Ca‐uptake by disc membranes prepared from frog rod photoreceptor outer segments was examined. Ca‐uptake study revealed two affinity sites which were saturated with 10–5M and 10–3M of ATP. When disc membranes in 20 mM Tris‐HCl buffer (pH 7.5) were stored at ‐20°C for 6 h, more than 95% of Ca‐uptake activity was lost.
N, Miki   +3 more
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The Biochemistry of Photoreceptor Cells

1981
Photoreceptor cells have high rates of metabolism, and enzyme distributions suggest considerable substrate movement. We have used tracer techniques to study the effects of light on photoreceptor metabolism. In vitro, glutamine is metabolized alongside glucose by rat photoreceptors, and is, potentially, a major precursor of the neuroactive amino acids ...
M. J. Voaden   +2 more
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Cell Fate Determination of Photoreceptor Cells

2014
Rods and cones are highly related, sharing many morphological and functional features. Early lineage studies showed that they are produced by mitotic retinal progenitor cells (RPCs) that produce not only photoreceptor cells, but other retinal cell types as well, even in a terminal division (Holt et al., Neuron 1(1):15–26, 1988; Turner and Cepko, Nature
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[Signal transduction in photoreceptor cells].

Die Naturwissenschaften, 1998
Vertebrate photoreceptors respond to light with a brief hyperpolarization of their membrane potential. In the dark, photoreceptors are depolarized by cation influx through channels in the plasma membrane which are kept open by the second messenger cGMP. Light absorption activates an enzyme cascade that hydrolytically destroys cGMP, resulting in channel
F, Müller, U B, Kaupp
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