منابع مشابه
Galloxanthin, a Carotenoid from the Chicken Retina* by George Wald
A new carotenoid has been isolated from the chicken retina. I t is proposed to call this galloxanthin, from GaUus, the generic name of the fowl, and the suffix -xanthin, which designates carotenoid alcohols or xanthophylls. This substance is interesting physiologically, as a new member of a series of carotenoid pigments which act as color filters for cone vision in the chicken (Wald and Zussman...
متن کاملThe Role of Sulfhydryl Groups in the Bleaching and Synthesis of Rhodopsin by George Wald And
A mixture of the carotenoid retinenel and the protein Qpsin, placed in the dark, reacts spontaneously to form the light-sensitive pigment of rod vision, rhodopsin (Wald and Brown, 1950). The nature of the binding between retinenel and opsin governs the conditions under which this synthesis occurs. Conversely the opening of the linkage between opsin and its chromophore as rhodopsin bleaches may ...
متن کاملTHE SYNTHESIS OF RHODOPSIN FROM VITAMIN A , By GEORGE WALD AND RUTH HUBBARD
material is a single molecular species, rather than a mixture of the native and slightly modified pignments. Note added in pro9f: Since this account was written we have observed regenerations of 85 per cent in purified cattle rhodopsin, flooded with retinenel, and bleached for 1 minute in intense light. 11 Wald, G., Documenta Ophthal., 3, 94 (1949). 12 Shantz, E. M., Embree, N. D., Hodge, H. C....
متن کاملApocalypse soon?
When the Lord smote the Philistines with emerods in their secret parts he left it to historians to debate the nature of this lethal affliction. Literally translated, emerods are haemorrhoids, but it is surely unlikely that so hardy a race would have succumbed to an epidemic of piles. Scholarly opinion seems to concur that the emerods were buboes in the groin, one of the agonising manifestations...
متن کاملApocalypse...now? Molecular epidemiology, predictive genetic tests, and social communication of genetic contents.
The author analyzes the underlying theoretical aspects in the construction of the molecular watershed of epidemiology and the concept of genetic risk, focusing on issues raised by contemporary reality: new technologies, globalization, proliferation of communications strategies, and the dilution of identity matrices. He discusses problems pertaining to the establishment of such new interdiscipli...
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ژورنال
عنوان ژورنال: Nature
سال: 1997
ISSN: 0028-0836,1476-4687
DOI: 10.1038/40251