Fig. 2

In vitro Zn NPs and ZnO antibacterial testing. a Bacterial counts after 24 h cultivation with 5 mmol/L zinc compounds. b Digital photographs of MRSA colonies on plates. c Fluorescence microscopy of live and dead cells (SYTO 9, green) and dead cells (PI, red), scale bar is 20 μm. The Zn NPs and ZnO inhibition effect on d E. coli, e S. aureus, and f MRSA (mean ± SD, n = 3)