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P700 oxidation rate. The ΔA820 over the initial 10 to 30 ms after the onset of actinic light was used to calculate the initial rate of P700 oxidation in control (A), 0.5 μm MV-treated (B), and 5 μm NF-treated (C) cultures. ○, Wild-type strain; •, sodB− strain. Each point represents the mean of three to eight samples and all data are percent of initial values. Error bars are sds. DBMIB (25 μm) was added to all samples to prevent re-reduction by the cyclic and noncyclic pathways.
