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Dynamic response of SMMC-7721 cells exposure to ZP5 ZnO nanoparticles. a in the absence of UV irradiation:aZnO nanoparticle-free (control),b2.5 μg/mL of ZnO nanoparticles,c5.0 μg/mL of ZnO nanoparticles and d10.0 μg/mL of ZnO nanoparticles; b The comparison of decrease for cell activity in the absence/presence of UV (irradiated for 180 s) after ZP 5 NPs was incubated in the cell system for about 72 h
