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The photoreceptors and visual pigments of the garter snake (Thamnophis sirtalis): a microspectrophotometric, scanning electron microscopic and immunocytochemical study
- A. Sillman, V. Govardovskii, P. Röhlich, J. Southard, E. Loew
- Biology, MedicineJournal of Comparative Physiology A
- 1 August 1997
The small single cones with the 360-nm pigment provide the garter snake with selective sensitivity to light in the near ultraviolet region of the spectrum, which might be important in localization of pheromone trails.
Studies on the mass receptor potential of the isolated frog retina. I. General properties of the response.
It was established that treatment of the excised frog retina with Ringer solutions containing sodium aspartate resulted in the suppression of the PII and proximal PIII components of the ERG and, therefore, the isolation of the distal PIII or receptor potential.
Studies on the mass receptor potential of the isolated frog retina. II. On the basis of the ionic mechanism.
The primary action of light in generating the receptor potential is one of decreasing the permeability of the photoreceptor membrane to sodium, and the metabolic pump is important only in maintaining the normal sodium concentration gradient.
Heavy metals affect rod, but not cone, photoreceptors.
The data implicate the rods as a lesion site in animals exhibiting scotopic vision deficits as a result of heavy metal poisoning.
Barium suppresses slow PIII in perfused bullfrog retina
Treatment of the retina with barium might provide another test of the suggested relationship between the Mtiller cell and the slow PIII, and a decrease in potassium concentration in the vicinity of the photoreceptor could indeed cause the Milller cells to hyperpolarize.
The photoreceptors and visual pigments in the retina of the white sturgeon, Acipenser transmontanus
The photoreceptors in the retina of the white sturgeon, Acipenser transmontanus (Chondrostei), were studied by means of scanning electron microscopy, in situ microspectrophotometry, and spectrophotometric analysis of visual pigment extracts, finding evidence for only one rod visual pigment and one cone visual pigment.
Retinal photoreceptors and visual pigments in Boa constrictor imperator.
- A. Sillman, J. L. Johnson, E. Loew
- Biology, MedicineThe Journal of experimental zoology
- 1 September 2001
The photoreceptors of Boa constrictor, a boid snake of the subfamily Boinae, were examined with scanning electron microscopy and microspectrophotometry and the data indicate that wavelength discrimination above 430 nm would not be possible without some input from the rods.
Histology and microspectrophotometry of the photoreceptors of a crocodilian, Alligator mississippiensis
Examination of the photoreceptors in the retina of Alligator mississippiensis confirms that the alligator retina is duplex with rods dominating but cones present in significant numbers.
Low levels of cadmium chloride damage the corneal endothelium
The effect of cadmium chloride on the integrity of the endothelium of isolated bullfrog (Rana catesbeiana) corneas was examined by spectrophotometric analysis of corneal uptake of the vital stain…
Age-related changes in the visual pigments of the white sturgeon (Acipenser transmontanus)
Using in situ microspectrophotometry, the spectral absorbance characteristics of the photoreceptors in the retinas of larval, juvenile, and adult white sturgeon (Acipenser transmontanus) were determined and the absence of red-sensitive cones in the larvae, and their presence in older fish was confirmed.