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• W2005641339 abstract "1. The amplitudes of the fast (0-20 microseconds) and slow (20 microseconds-2 ms) fluorescence rise induced by a 2 microseconds flash have been measured as a function of the energy of the flash in chloroplasts inhibited by 3(3,4-dichlorophenyl)-1, 1-dimethylurea. The saturation curve for the slow rise shows a characteristic lag which is not observed for the fast fluorescence rise. This lag indicates that Photosystem II centers undergo a double hit process which implies that (a), each photocenter includes two acceptors Q1 and Q2; (B), after the first hit, oxidized chlorophyll Chl+ is reduced by a secondary acceptor Y in a time shor compared to the duration of the flash; (c), after the second hit, Chl+ is reduced by another secondary donor, D. 2. According to Den Haan et al. (1974) Biochim. Biophys. Acta 368, 409-421), hydroxylamine destroys the secondary donor responsible for the fast reduction of Chl+. In the presence of 3 mM hydroxylamine, only the secondary donor D is functional and a flash induses mainly a single hit process. 3. The saturation curves for the fast and the slow rises have been studied in the presence of 3(3,4-dichlorophenyl)-1, 1-dimethylurea for a second actinic flash given 2.5 s after a first saturating one. The large decrease in the half-saturating energy indicates the existence of efficient energy transfer occuring between potosynthetic units. 4. Two alternate hypotheses are discussed (a) in which D is an auxiliary donor and (b) in which D is included in the main electron transfer chain." @default.
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• W2005641339 date "1977-12-01" @default.
• W2005641339 modified "2023-09-26" @default.
• W2005641339 title "Evidence for a double hit process in Photosystem II based on fluorescence studies" @default.
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• W2005641339 doi "https://doi.org/10.1016/0005-2728(77)90101-3" @default.
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