Figure 6.

Dynamic response of SMMC-7721 cells exposure to ZP7 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 7 NPs was incubated in the cell system for about 72 h

Li et al. Nanoscale Research Letters 2010 5:1063-1071   doi:10.1007/s11671-010-9603-4