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- W2808746 abstract "The changes in quinone and pigment composition of isolated spinach chloroplasts were investigated after treatment with UV-light of 254 mμ, which is known to decrease the Hill- reaction activity. The plastidquinones are more UV-sensitive than carotenoids (except neoxanthin) and chlorophylls. Neoxanthin, reduced plastoquinone 45 and α-tocopherol function consecutively as lipid antioxidants and are first destroyed. The latter are oxidized to the corresponding quinones plastoquinone 45 and α-tocoquinone, which thus seem to be less UV-sensitive. The decrease of the Hillreaction activity runs parallel with the decomposition of plastoquinol (= Plastohydrochinon) and not with that of plastoquinone as has been assumed so far. This indicates that plastoquinol is needed for performance of the Hill - reaction. The naphthoquinone vitamin K 1 , bound to the pigment system I of photosynthesis, is less UV-sensitive than the plastidquinones of the benzoquinone type which are associated mainly with the pigment system II. The possible function of vitamin K 1 as one natural cofactor of cyclic photophosphorylation is discussed." @default.
- W2808746 created "2016-06-24" @default.
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- W2808746 date "1969-06-01" @default.
- W2808746 modified "2023-09-27" @default.
- W2808746 title "Die Wirkung von UV-Strahlen auf die Lipochinon-Pigment-Zusammensetzung isolierter Spinatchloroplasten / Effect of uv-light on the lipoquinone and pigment composition of isolated spinach chloroplasts" @default.
- W2808746 doi "https://doi.org/10.1515/znb-1969-0619" @default.
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