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AgNP-PNS antibacterial activity against (a) P. aeruginosa (PAO1) and (b) S. mutans in liquid medium. Bacterial cultures in the absence of AgNP-PNS were used as positive controls (CTL). Data were reported as a percentage in the comparison with CTL. For each sample, three different experiments were run and the results were expressed as the mean ± SD of the values obtained. Statistically significant variations: * p < 0.05, ** p < 0.01, and *** p < 0.001 vs. 50 μg/mL and 100 μg/mL.
