Abstract
THE substances and processes found in the retina and pigment epithelium of the bull frog, Rana catesbiana, are identical with those in species of frogs previously examined1. The retina contains varying amounts of the carotenoids retinene and vitamin A. Retinene is yellow, and when mixed with antimony trichloride reagent yields a sharp absorption band at 662–666 m. (In the hand spectroscope this band has invariably appeared to be at about 655 m, the position originally given.) Vitamin A is colourless in comparable concentrations, and in the antimony trichloride test yields a band at 612–615 m (crude extracts).
Similar content being viewed by others
Article PDF
Change history
01 December 1935
In the communications by G. Wald entitled “Pigments of the Bull Frog Retina” (NATURE, Nov. 23, p. 832) and “The Visual Purple System in Marine Fishes” (NATURE, Dec. 7, p. 913), the ordinates of the graphs should read “Extinction (log J0AO” instead of “Extinction (109/0/-0” as printed.
References
G. Wald, NATURE, 134, 65 ; 1934. J. Gen. Physiol., 19, 1935–36, in press.
H. von Euler, and E. Adler, Z. physiol. Chem., 223, 105 ; 228, 1; 1934.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
WALD, G. Pigments of the Bull Frog Retina. Nature 136, 832 (1935). https://doi.org/10.1038/136832c0
Issue Date:
DOI: https://doi.org/10.1038/136832c0
This article is cited by
-
The Molecular Basis of Visual Excitation
Nature (1968)
-
Untersuchungen über den Vitamin-A-Stoffwechsel des Auges
Virchows Archiv für Pathologische Anatomie und Physiologie und für Klinische Medizin (1940)
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.