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• W2055571426 abstract "Radioisotopes and t.l.c. were used to indirectly determine the distribution and proportions of Vitamin A compounds in the rat eye. In the dark adapted eye there are Vitamin A compounds in the pigment epithelium; these compounds are likely within the rod outer segment discs being digested there. During light adaptation. 11-cis retinal decreases, alltrans retinal increases and is reduced to retinol, and retinol is esterified to fatty acids in the retina and in the pigment epithelium. Essentially the reverse occurs during dark adaptation. It is suggested that the metabolism of Vitamin A compounds in the eye functions to return chromophore to the newly synthesized visual pigment at the base of the rod outer segment. On emploie les radioisotopes et la chromatographie en couche mince pour déterminer indirectement la distribution et les proportions des composés de Vitamine A dans l'oeil du rat. Dans l'oeil adaptéàl'obscurité, il y a des composés de Vitamine A dans l'épithélium pigmentaire; il est probable que ces composés sont utilisés dans les disques des segments externes des baˆtonnets. En adaptationàla lumière, le rétinal 11-cis décroit, tout le rétinaltrans augmente et est réduit en rétinol, et le rétinol est estérifiéen acides gras dans la rétine et dans l'épithélium pigmentaire. En gros l'inverse se passe en adaptationàl'obscurité. On suggère que le métabolisme des composés de Vitamine A dans l'oeil sertàrétablir le chromophore dans le pigment visuel synthétiséànouveauàla base de segment externe du baˆtonnet. Radioisotopie und Dünnschichtchromatographie wurden zum indirekten Nachweis von Verteilung und Häufigkeit von Vitamin-A-Verbindungen im Rattenauge verwendet. Im dunkeladaptierten Auge enthält das Pigmentepithel Vitamin-A-Verbindungen; diese Verbindungen befinden sich wahrscheinlich in denäusseren Stäbchensegmentscheiben in gelöstem Zustand. Bei Helladaptation nimmt 11′-cis-Retinen ab und all-trans-Retinen zu und wird zu Retinol reduziert. Dieses verestert zu Fettsäure in der Retina und im Pigmentepithel. Im wesentlichen das Umgekehrte geschieht bei Dunkeladaptation. Es wird vermutet, dass der Metabolismus der Vitamin-A-Verbindungen im Auge so wirkt, dass die chromophore Gruppe zu dem erneut erzeugten Sehpigment an der Basis desäusseren Stäbchensegmentes zurückwandert. Paдиoизoтoпы и тoнкo-cлoйнaя хpoмaтoгpaфия были иcпoльзoвaны для нeпpямoгo oпpeдeлeния pacпpeдeлeния и пpoпopций coeдинeний витaминa A в глaзy кpыcы. B тeмнoaдaптиpoвaннoм глaзy coeдинeния нaхoдятcя в пигмeнтнoм зпитeлии; зти coeдинeния, вepoятн, ycвaивaютcя внyтpи диcкoв нapyжных ceгмeнтoв пaлoхeк. Bo вpeмя cвeтoвoй aдaптaции, coдepжaниe 11-хИc peтинaля-yвeИхИвaвTcя и oн вoccтaнaaливaeтcя дo peтинoлa, и peтинoл зкcтpифициpyeтcя дo жиpных киcлoт в ceтхaткe и пигмeнтнoм зпитeлии. Cyщceтвeннo, хтo oбpaтнaя peaкция нaблюдaeтcя вo вpeмя тeмнoвoй aдaптaции. Пpeдиoлoжeнo, хтo мeтaбoлизм coeдинeний витaминa A в глaзy paбoтaeт, хтoбы вepнyть хpoмoфop к внoвь cинтeзиpyющeмycя зpитeльнoмy пигмeнтy в ocнoвaнии нapyжнoгo ceгмeнтa пaлoхки." @default.
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• W2055571426 date "1974-09-01" @default.
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• W2055571426 title "The distribution and proportions of vitamin A compounds during the visual cycle in the rat" @default.
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• W2055571426 doi "https://doi.org/10.1016/0042-6989(74)90143-6" @default.
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