Figure 1

Chlorella sorokiniana growth, expressed as packed cell volume, in control cells (−●-), in Pb-treated (−□-) or in Cd-treated cells (−Δ-). Data are means ± SE (n = 3). In the algal culture, Pb and Cd were supplied as 250 μM (particulars in Materials and Methods). Asterisks (*) indicate that mean values are significantly different between the treatments and the corresponding control (P < 0.05, ANOVA, Tukey multiple comparison).