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AgNPs and AuNPs antibacterial activity evaluation against (a,b) Staphylococcus aureus ATCC 29213 and (c,d) Escherichia coli ATCC 25922. “CA-MHB”: Culture medium control (i.e., culture medium free of bacteria and nanoparticles); “NPs 256 µM”: Nanoparticles control (i.e., bacteria-free culture medium, but with nanoparticles at 256 µmol/L); “S. aureus or E. coli”: Bacterial growth control (i.e., growing bacteria free of nanoparticles).
