Figure 3

Effect of nanoparticles on cell growth/cell viability of Chlorella vulgaris . Cell growth of C. vulgaris after exposure to Multi-walled carbon nanotubes (MWCNTs) or cotton cellulose nanofibers (CNFs) at various incubation concentrations (1, 50 and 100 μg ml⁻¹) and time points (24, 48, 72 and 96 hours) in Bold’s basal (BB) culture medium (A) and Seine river water (B). Cell viability of C. vulgaris after exposure to MWCNTs or cotton CNFs at various incubation concentrations (1, 50 and 100 μg ml⁻¹) and time points (24, 48, 72 and 96 hours) in BB culture medium (C) and Seine river water (D). Data are presented as mean ± SEM from three independent experiments. Groups significantly different from the control group (by ANOVA followed by Student–Newman–Keuls’ test) are shown by *p < 0.05.