منابع مشابه
Light-induced calcium release and re-uptake in toad rods.
Laser micromass analysis was used to investigate the effect of light on the Ca content of rod outer segments in the isolated retina and eyecup of the toad, Bufo marinus. Isolated retinas were incubated in Ringer for which most of the Ca (normally 97% 40Ca) was replaced with 44Ca, so that release of internal Ca (as 40Ca) could be distinguished from the uptake of 44Ca from the external medium. Co...
متن کاملDetection of single photons by toad and mouse rods.
Amphibian and mammalian rods can both detect single photons of light even though they differ greatly in physical dimensions, mammalian rods being much smaller in diameter than amphibian rods. To understand the changes in physiology and biochemistry required by such large differences in outer segment geometry, we developed a computational approach, taking into account the spatial organization of...
متن کاملVariability in the Time Course of Single Photon Responses from Toad Rods Termination of Rhodopsin’s Activity
We examined the responses of toad rod photoreceptors to single photons of light. To minimize the effects of variability in the early rising phase, we selected sets of responses that closely matched the rise of the mean single photon response. Responses selected in this way showed substantial variations in kinetics, appearing to peel off from a common time course after different delays. Followin...
متن کاملAxial gradients of rhodopsin in light-exposed retinal rods of the toad
Exposure of an intact vertebrate eye to light bleaches the rhodopsin in the photoreceptor outer segments in spatially nonuniform patterns. Some axial bleaching patterns produced in toad rods were determined using microspectrophotometric techniques. More rhodopsin was bleached at the base of the outer segment than at the distal tip. The shape of the bleaching gradient varied with the extent of b...
متن کاملTemperature effects on spectral properties of red and green rods in toad retina.
Temperature effects on spectral properties of the two types of rod photoreceptors in toad retina, "red" and "green" rods, were studied in the range 0-38 degrees C. Absorbance spectra of the visual pigments were recorded by single-cell microspectrophotometry (MSP) and spectral sensitivities of red rods were measured by electroretinogram (ERG) recording across the isolated retina. The red-rod vis...
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ژورنال
عنوان ژورنال: The Journal of Physiology
سال: 1980
ISSN: 0022-3751
DOI: 10.1113/jphysiol.1980.sp013300