Figure 2
From: Synergistic antibacterial effect of copper and silver nanoparticles and their mechanism of action

Coefficient of antibacterial synergy between cAg and copper components in different bacteria in the RPMI cell culture medium. The mean values with standard deviation are shown. *P < 0.05; **P < 0.01; ***P < 0.001. cAg, Coated silver nanoparticles; CuO Copper oxide; CuO–NH2, Copper oxide coated with amino groups; CuO–COOH, Copper oxide coated with carboxy groups; CuSO4, Copper sulphate.