Fig. 1

Dose-dependent effects of silica microparticles on the proliferation A and the superoxide dismutase (SOD) activity B of HL60, MG63, and Balb/c cells. n = 4 A and n = 5 B in independent cultures. The raw cell numbers at 100% represent 7.49 ± 9.84 × 105 (HL60), 2.68 ± 0.16 × 105 (MG63), and 3.09 ± 0.33 × 105/dish (Balb/c), respectively. aP < 0.05 represents a significant difference from the respective controls, to which no silica suspension was added