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Reduction kinetics of the photo‐oxidized chlorophyll a + II in the nanosecond range
Author(s) -
Eckert H.-J.,
Renger G.,
Witt H.T.
Publication year - 1984
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(84)80149-0
Subject(s) - microsecond , nanosecond , kinetics , photochemistry , chemistry , absorption (acoustics) , chlorophyll , photosystem ii , flash photolysis , analytical chemistry (journal) , laser , photosynthesis , materials science , optics , reaction rate constant , biochemistry , physics , chromatography , organic chemistry , quantum mechanics , composite material
The 688 nm absorption changes (Δ A 688 ), indicating the photochemical turnover of chlorophyll a II (Chl a II ) have been investigated under repetitive laser flash excitation conditions in spinach chlorplasts. It was found that under steady state conditions about 50–60% of the photo‐oxidized primary donor of Photosystem II (PS II), Chl a + II , becomes re‐reduced with a biphasic kinetics in the nanosecond time scale with half‐life times of about 50 ns and 400 ns. The remaining Chl a + II becomes re‐reduced in the microsecond range.