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(A) Specific rates of net H2 and O2 production. Time zero indicates onset of nitrogen-depletion and absence of media addition (dilution rate = 0). (B) Variable chlorophyll fluorescence originating from PS II: the maximum relative electron transfer rate (rETRmax) and the optimal quantum yield (Fv/Fm). Data plotted at times prior to t = 0 represent measurements taken during the ammonia limited chemostat (i.e., steady-state precondition).
