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This mini-review briefly summarizes our current knowledge on the reaction pattern of light-driven water splitting and the structure of Photosystem II that acts as a water:plastoquinone oxidoreductase. The overall process comprises three types of reaction sequences: (a) light-induced charge separation leading to formation of the radical ion pair P680+•Q A−• ; (b) reduction of plastoquinone to plastoquinol...
EPR properties of Cyt b-559 have been investigated in intact chloroplasts that are functionally competent in O 2 evolution and in CO 2 fixation. After chemical oxidation of Cyt b-559 by 10 mM 2,3-dicyano, 4, 5-dichloro-p-benzoquinone (DDQ) the major part of Cyt b-559 is found to be present in the high spin Fe(III) form. Only a small fraction of low spin heme Fe(III) (less than 5%)...
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