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• W2021554418 abstract "The oxygen flash yield and the kinetics of Chl a+II (P-680+) reduction have been measured under repetitive excitation as a function of pH between pH 4.0 and pH 9.0 in oxygen-evolving PS II particles from Synechococcus sp. (i) The optimum of oxygen yield is observed between pH 6.5 and pH 7.5. The inhibition in the acidic pH region is reversible and can be described by a monoprotic binding site with a pK value of about 4.5. In the alkaline pH region the inhibition is half maximal at pH 8.3 and might be described by the titration of three binding sites or more. The loss of oxygen evolution at pH 9.0 is caused by reversible inhibition and irreversible inactivation. (ii) Between pH 4.0 and pH 7.5 the fraction of Chl a+II decaying in the nanosecond time range and the oxygen yield follow the same pH dependence. (iii) Both in Photosystem II centers reversibly inhibited at low pH and in Photosystem II centers inactivated at high pH, Chl a+II is reduced by a donor Z, different from the normal immediate donor D1 or a modified state of D1, and, in part, by back reaction. (iv) Below pH 5.0, the decay in the nanosecond range can be explained by the existence of two phases with t12 ≈ 42 ns and t12 ≈ 300 ns (ratio of amplitudes, 1.3:1). A reduction phase with t12 = 20 ns that is the major phase around the pH optimum is not observed below pH 5.0." @default.
• W2021554418 created "2016-06-24" @default.
• W2021554418 creator A5061821580 @default.
• W2021554418 creator A5068444361 @default.
• W2021554418 date "1987-01-01" @default.
• W2021554418 modified "2023-10-01" @default.
• W2021554418 title "pH dependence of oxygen evolution and reduction kinetics of photooxidized chlorophyll aII (P-680) in Photosystem II particles from Synechococcus sp." @default.
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• W2021554418 doi "https://doi.org/10.1016/0005-2728(87)90064-8" @default.
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