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Effect of different concentrations of Ag NPs on Chlorella vulgaris chlorophyll a concentration in µg L−1: (a) 50 nm Ag NPs, (b) 100 nm Ag NPs. The experiments were performed in triplicate, and results are displayed as the mean with standard deviations (Asterisks specify significant differences from control values (p < 0.05); n = 3).
