931785.fig.001a
(a)
931785.fig.001b
(b)
Figure 1: Cell viability measured by MTT assay in A549 cells exposed to increasing concentration (1–100 μg/mL) of Cd-SiO2NPs (-□-), CdCl2 (--), and SiO2NPs (--) after 24 (a) and 48 h (b). Data are mean ± DS of three separate experiments each carried out in six replicates. Error bars: ±SD.