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Detailed optical and EPR analyses of states induced in dark-adapted PS II membranes by cryogenic illumination permit characterization and quantification of all pigment derived donors and acceptors, as well as optically silent (in the visible, near infrared) species which are EPR active. Near complete turnover formation of Q A− is seen in all centers, but with variable efficiency, depending...
Ca 2+ depletion of Photosystem II from spinach results in reversible retardation of electron transfer on both donor and acceptor sides. On the donor side, a decrease of the electron transfer rate from TyrZ results in an enhanced charge recombination between the oxidized primary donor, P680 + , and the reduced acceptor quinone, Q -A , which in turn leads to a decrease...
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