Fig. 2.

Kinetics of tyrosine oxidation recorded at 3465 G under continuous white light (black traces) or far-red illumination (red traces) in the reduced Mn-depleted PS II membranes at pH 4.7 (A), pH 6.3 (B), and pH 8.5 (C). Each trace represents an average of four single measurements in independent samples. The amplitude of tyrosine radical after 5 min dark incubation is indicated as a black or red circle at the end of the each trace. The arrows indicate starting time point of illumination. EPR conditions: microwave frequency 9.75 GHz, microwave power 8 mW, modulation amplitude 5 G, temperature 293 K