Figure 3.
Total intracellular and extracellular microcystin (MC) concentrations 24 h after addition of different hydrogen peroxide (H2O2) concentrations. Microcystis PCC 7806 was exposed to three different light intensities: (A) 0 µmol photons·m−2·s−1, (B) 15 µmol photons·m−2·s−1, and (C) 100 µmol photons·m−2·s−1. Gray and black bars show intracellular and extracellular MC, respectively, at 24 h after H2O2 addition. Each bar represents the average of two independent biological replicates per treatment. Dashed lines indicate the total MC concentration prior to H2O2 addition (t = 0 h).