Figure 3From: Environmentally persistent free radicals amplify ultrafine particle mediated cellular oxidative stress and cytotoxicity Cytotoxicity in BEAS-2B cells exposed to CuO/Silica or MCP230 ultrafine particles for 0.5, 1, 2 and 4 h. Results are expressed as mean ± SEM (n = 3). Significantly different from auntreated controls or bCuO/Silica at the same dose and exposure time (Two-way ANOVA; *P < 0.05, **P < 0.01, ***P < 0.001).Back to article page