منابع مشابه
Photochemistry of Visual Purple
It is shown that the velocity of bleaching of visual purple by light, under comparable conditions of concentration, volume, and surface exposed, is directly proportional to the intensity.
متن کاملVisual Purple and the Photopic Luminosity Curve.
Introduction THE precise relationship which has been established between the scotopic luminosity curve a'nd visual purple (Dartnall & Goodeve, 1937; Wald, 19138) leads one to expect that the photopic luminositv curve is'similarly related to some " photopic " pigment or pigments. This latter hypothesis has given rise to considerable speculation, particularly since the evidence for the existence ...
متن کاملThe Absorption Spectrum of Visual Purple
The absorption spectra of visual purple solutions extracted by various means were measured with a sensitive photoelectric spectrophotometer and compared with the classical visual purple absorption spectrum. Hardening the retinas in alum before extraction yielded visual purple solutions of much higher light transmission in the blue and violet, probably because of the removal of light-dispersing ...
متن کاملRegeneration of Visual Purple in Solution
1. Measurements of visual purple regeneration in solution have been made by a procedure which minimized distortion of the results by other color changes so that density changes caused by the regenerating substance alone are obtained. 2. Bleaching a visual purple solution with blue and violet light causes a greater subsequent regeneration than does an equivalent bleaching with light which lacks ...
متن کاملI 77 . the Cataphoretic Mobility of Visual Purple
THE photosensitive substancecontained -in the -rods of the eyes of ve#tebrates, visual purple, is a chromoprotein, i.e. a protein to which one or more chromophores are attached. Aqueous solutions of visual puirple are-decomposed by light to give an unstable compound "transient orange", which in turn bleaches thermally to "indicator yellow" [Lythgoe, 1937]. Indicator yellow may also be formed wi...
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ژورنال
عنوان ژورنال: Scientific American
سال: 1881
ISSN: 0036-8733
DOI: 10.1038/scientificamerican02191881-4274bsupp