Fig. 3

The effect of Tb₄O₇ NPs on survival rates of bacteria a CFUs of S. aureus following incubation with Tb₄O₇ NPs; b CFUs of E. coli following incubation with Tb₄O₇ NPs; c Representative fluorescence and SEM images of S. aureus after Tb₄O₇ NPs treatments. Bacterial cells were treated with 1) PBS as control, 2) 25 μg/mL Tb₄O₇ NPs, 3) 50 μg/mL Tb₄O₇ NPs or 4) 100 μg/mL Tb₄O₇ NPs; d Representative fluorescence and SEM images of E. coli after Tb₄O₇ NPs treatments. Bacterial cells were treated with 1) PBS as control, 2) 10 μg/mL Tb₄O₇ NPs, 3) 25 μg/mL Tb₄O₇ NPs or 4) 50 μg/mL Tb₄O₇ NPs. **p < 0.01 and ***p < 0.001 vs control