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Time course changes of Chl fluorescence parameters in Synechocystis cells incubated with 70.4 mM (4×) NO2−. (A) Maximum quantum yields of PSII (Fv/Fm) with or without 20 μM DCMU. (B) Minimal fluorescence level (Fo) in the dark-adapted state and maximal fluorescence level (Fm) in the presence of 20 μM DCMU at the closed PSII center. Values are given as means or means ± SD (n = 5).
