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• W2144314922 abstract "Abstract This study has investigated the quantities, isomeric configuration and ocular distribution of the two retinols (vitamins A 1 and A 2 ) in the eyes of goldfish. Xenopus . frogs and tadpoles, with particular emphasis on the shifting relationships of rhodopsin, porphyropsin. retinol and 3-dehydroretinol in tadpoles kept in light and darkness. The amounts of retinols (mainly esterified) stored in the dark-adapted eyes range from 41 moles per mole of visual pigment in the goldfish down to 0.4 mole in the Xenopus . The cleanly isolated frog retina has 0.07 mole of 11- cis and all- trans vitamin A (50 per cent esterified) per mole of ROS rhodopsin, the remainder (1 per cent esterified) being found in the pigment epithelium, 80 per cent in the oil-droplets separated by centrifugal flotation. A maximum of 3 per cent of the rhodopsin in the ROS is apparently in the pigment epithelium. During light-adaptation, retinol formed by rhodopsin bleaching in the ROS leaves the retina, enters the pigment epithelium where most of it passes into the oil-droplets. The dark-adapted stores always contain 11- cis isomer, which is present in least amount in eyes that have undergone one cycle of light- and dark-adaptation. During prolonged periods in the dark, there was an increase of 11- cis at the expense of all- trans retinyl ester. In illuminated tadpoles retinol and 3-dehydroretinol are utilized for visual pigment regeneration in the proportions present in the pigment epithelium. This is not observed in the dark, where the situation is dominated by the visual pigment renewal process. The prosthetic group used for visual pigment biosynthesis in the tadpole retina is mainly retinol, even though there is an overwhelming preponderance of 3-dehydroretinol in the pigment epithelium." @default.
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• W2144314922 date "1975-12-01" @default.
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• W2144314922 title "Storage, distribution and utilization of vitamins A in the eyes of adult amphibians and their tadpoles" @default.
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• W2144314922 doi "https://doi.org/10.1016/0042-6989(75)90183-2" @default.
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