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The field indicating electrochromic 515 nm absorption change has been m easured under different excitation conditions in DCMU poisoned chloroplasts in the presence of benzylviologen as electron acceptor. It has been found :

zeitschrift für naturforschung c

Studies on the Nature of the Primary Reactions of Photosystem II in Photosynthesis I. The Electrochromic 515 nm Absorption Change as an A ppropriate Indicator for the Functional State of the Photochemical Active Centers of System II in DCMU Poisoned Chloroplasts