Figure 7From: The Photodynamic Effect of Different Size ZnO Nanoparticles on Cancer Cell Proliferation In Vitroa Decrease of cell index after different concentration ZnO NPs was incubated in the cell system for about 72 h without UV irradiation. b Comparison of cell inhibition for different-sized ZnO NPs in the absence of UV irradiation. c Decrease in cell index after different concentration ZnO NPs was incubated in the cell system for about 72 h with UV irradiation for 180 s. d Comparison of cell inhibition for different-sized ZnO NPs in the presence of UV irradiation for 180 sBack to article page