ZnO Nanoparticles Treatment Induces Apoptosis by Increasing Intracellular ROS Levels in LTEP-a-2 Cells

Figure 2

Relative viability of LTEP-a-2 cells after 4–24 h of exposure to different concentrations of ZnO nanoparticles (0 μg/mL, control). (a) 4 and 8 h and (b) 12 and 24 h. versus control, ; versus control, by Student’s -test.

(a)

(b)