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Интеллектуальная Система Тематического Исследования НАукометрических данных |
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Background. 11-cis retinol is a precursor of 11-cis retinal in the visual cycle of invertebrates as well as vertebrates. In the course of comparative studies of two model populations of Mysis relicta, one (Lp) from a very dark lake, the other (Sp) from the more variably lit Baltic Sea, we have found that the “dark” level of free retinol is significantly higher in Lp than in Sp eyes. Question. How do the levels of total retinol and its main isomers (11-cis, 13-cis and all-trans) change upon illumination and during subsequent dark adaptation in the two populations? Results. The content of 11-cis and all-trans retinol isomers was approximately the same in dark-adapted eyes of both Lp and Sp. In both populations, the strong light exposure increased free retinol, but in Lp the increase was much greater and quite dramatic: 11-cis increased by 15-fold and all-trans by 7-fold. Then, in darkness, these isomers fell back towards the pre-exposure values with a time constant of ca. ten days. Discussion. The constantly high level and the massive light-induced release of free retinol in Lp are inherent differences of this population compared with the Sp population. These differences will be discussed against the background of a proposed scheme for the visual cycle of Mysis relicta.