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- W1969928071 abstract "Abstract The stoichiometry of chlorophyll/Photosystem II was determined in pea thylakoids. The concentration of Photosystem II was determined by the absorption change at 325 nm. When the 325 nm measurement was made on the first flash in the presence of ferricyanide, the Photosystem II absorption change was found to increase by up to 100% of the same measurement made in the absence of ferricyanide. The increase in absorption change in the presence of various amounts of ferricyanide was found to correlate well with the increase in area above the Chl a fluorescence induction curve. Also, the dark recovery of both the 325 nm absorption change and the area above the Chl a fluorescence curve are similar and in the order of several minutes. Absorption changes made under repetitive flash excitation showed no increase in signal with the addition of ferricyanide. We conclude that there are two acceptors, Q a and Q 400 , for each active oxygen-evolving complex and only Q a is involved in active electron transport to Photosystem I." @default.
- W1969928071 created "2016-06-24" @default.
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- W1969928071 date "1985-06-01" @default.
- W1969928071 modified "2023-09-25" @default.
- W1969928071 title "A comparison of the absorption changes near 325 nm and chlorophyll a fluorescence characteristics of the Photosystem II acceptors Qa and Q400" @default.
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- W1969928071 doi "https://doi.org/10.1016/0005-2728(85)90043-x" @default.
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