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Change in antioxidant activity of ethanolic extract from Porphyridium cruentum exposed to Ag and Au nanoparticles (10 µM AgNP 10 nm; 10 µM AgNP 20 nm; 0.5 nM AuNP 10 nm; 0.05 nM AuNP 20 nm) during the lag phase (A) and exponential growth phase (B).
