去世 发表于 2025-3-25 03:34:08
Cis-trãns Isomeric Carotenoids Vitamins A and Arylpolyenes978-3-7091-5548-6Instinctive 发表于 2025-3-25 08:00:20
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Zusammenfassung der Diskussionsergebnisseear in plants and animals is a question of biological and genetical interest. The relative scarcity of . carotenoids in living tissue indicates the presence of some directing and protective mechanism that forms and preserves the all-. configuration, even when the pigment is exposed to strong sunlighWATER 发表于 2025-3-26 03:44:19
Zusammenfassung der Diskussionsergebnisseovern this relationship fully known, it would be easy to assign . configurations. Since this is not the case, some of the following considerations and assignments have tentative character and require confirmation by stereospecific syntheses.男学院 发表于 2025-3-26 05:22:03
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https://doi.org/10.1007/978-3-662-09730-4 (.), Euler (.), Karrer (.), and others. It is now well known that .-carotene whose molecules contain two unsubstituted .-ionone rings is partially converted in the body into vitamin A, according to the schematic expression, C.H. → C.H.OH. Several other naturally occurring carotenoids such as .-caroAMPLE 发表于 2025-3-26 13:49:00
Rehabilitation als biographischer Prozeßnstead of 40. As a special feature they carry functional groups at the end of the aliphatic chain. The structures of the four most important compounds to be discussed appear in the formulas (LI)–(LIV.)敬礼 发表于 2025-3-26 17:29:19
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