Fig. 1

Cytotoxicity of CuO NP, CuO MP and CuCl2 . Cytotoxicity was determined via cell number after 24 h treatment with the different copper compounds in BEAS-2B cells. Shown are mean values of six determinations derived from three independent experiments ± SD. Statistically significant different from control: *p ≤ 0.05, **p ≤ 0.01, ***p ≤ 0.001 (ANOVA-Dunnett’s T test)