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(a) Chlorophyll-a concentrations (CHL-a, μg L−1); (b) photosystem II efficiency (PSII); and (c) particle concentration (No. mL−1) in Microcystis aeruginosa PCC 7820 exposed to different ultrasound transducers (Flexidal AL-05 and AL-10) and in non-exposed control populations (control). Error bars indicate 1 SD (n = 3).
