منابع مشابه
Facilitation in arthropod photoreceptors
Dear Sir, A paradoxical effect of light has been observed in some invertebrate photoreceptors: an increased amplitude of electrophysiological responses to test flashes following illumination by a step or flash of light. This apparent increase in photoreceptor sensitivity is known as facilitation, and is in contrast to the better known case of reduced sensitivity following illumination (light ad...
متن کاملCytoskeletal elements in arthropod sensilla and mammalian photoreceptors.
Ciliary receptor cells, typified by cilia or modified cilia, are very common in the animal kingdom. In addition to the cytoskeleton of their ciliary processes these receptors possess other specific prominent cytoskeletal elements. Two representative systems are presented: i) scolopidia, mechanosensitive sensilla of various arthropod species; and ii) photoreceptor cells of the retina of the bovi...
متن کاملSynaptic facilitation at connections of Hermissenda type B photoreceptors.
The enhancement of excitability in type B photoreceptors is an important neural mechanism underlying classically conditioned suppression of phototaxis in the marine mollusk Hermissenda crassicornis. However, the possibility that type B photoreceptors also exhibit synaptic plasticity has not previously been explored. We now report that connections of type B photoreceptors onto type A photorecept...
متن کاملFrom Fruit Flies to Barnacles, Histamine Is the Neurotransmitter of Arthropod Photoreceptors
to adapt, centering their operating range on the value of presynaptic voltage set by the background light intensity. Even when the photoreceptor is maintained in a depolarized state in bright lights, these hardy synapses do not fatigue (Hayashi et al., 1985). This intriguing synAnn E. Stuart* Department of Cell and Molecular Physiology University of North Carolina at Chapel Hill Chapel Hill, No...
متن کاملDepolarization-induced calcium channel facilitation in rod photoreceptors is independent of G proteins and phosphorylation.
Depolarization-induced facilitation of L-type Ca channels in rod photoreceptors was investigated with nystatin-perforated and ruptured whole cell patch-clamp techniques in cells isolated from tiger salamander retina. Induction of facilitation was voltage dependent with a half-maximal effect seen at prepulse potentials near +31 mV. Reversal of facilitation was time dependent with fast (tau appro...
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ژورنال
عنوان ژورنال: Journal of General Physiology
سال: 1978
ISSN: 0022-1295,1540-7748
DOI: 10.1085/jgp.71.2.221