Results 301 to 310 of about 107,639 (354)

Photoreceptor cells and eyes in Annelida

Arthropod Structure & Development, 2006
The evolution of photoreceptor cells and eyes in Metazoa is far from being resolved, although recent developmental and morphological studies provided strong evidence for a common origin of photoreceptor cells and existence of sister cell types in early metazoans.
Günter, Purschke, Detlev, Arendt, Harald, Hausen, Monika C M, Müller   +3 more
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Presynaptic tubular structures in photoreceptor cells

Zeitschrift f�r Zellforschung und Mikroskopische Anatomie, 1971
After the application of fixatives including phosphotungstic acid or a mixture of osmium tetroxide and zinc iodide, complex tubular structures are evident in the presynaptic side of the synapses between photoreceptor and bipolar cells of the rat's retina. In the first case only the limiting membranes are visualized, while in the second only the content
A P, De Iraldi, A M, Suburo
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Ca2+ Signaling in Drosophila Photoreceptor Cells

2019
In Drosophila photoreceptor cells, Ca2+ exerts regulatory functions that control the shape, duration, and amplitude of the light response. Ca2+ also orchestrates light adaptation allowing Drosophila to see in light intensity regimes that span several orders of magnitude ranging from single photons to bright sunlight. The prime source for Ca2+ elevation
Olaf, Voolstra, Armin, Huber
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Peroxynitrite-induced apoptosis in photoreceptor cells

Current Eye Research, 2004
To study the mechanisms of peroxynitrite-induced photoreceptor cell damage, using retinal cultures and a peroxynitrite donor, 3-morpholinosydnonimine (SIN-1).Retinal explants obtained from 20-day-old Lewis rat pups, were exposed to SIN-1 for varying lengths of time at varying concentrations.
Shinji, Ito, Guey-Shuang, Wu, Takashi, Kimoto, Toshio, Hisatomi, Tatsuro, Ishibashi, Narsing A, Rao   +5 more
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Fluorescence of Photoreceptor Cells Observed in Vivo

Science, 1981
Most rhabdomeres in the eye of the fly ( Musca domestica ) are fluorescent. One kind of fluorescent emission emanates from a photoproduct of the visual pigment, other kinds may be ascribed to photostable pigments. These phenomena provide not only a means of spectrally mapping the retina but also a new spectroscopic ...
Franceschini, N., Kirschfeld, K., Minke, B.   +2 more
openaire   +3 more sources

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, S S, Greenhouse, W, Gern, G, Adamus, P A, Hargrave, L S, Lang, L A, Donoso   +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
openaire   +2 more sources