Figure 5

OASTL activity (U mg ^-1 protein) in Chlorella sorokiniana cells exposed to Pb or Cd for 2 and 24 h. Data are means ± SE (n = 6). In the algal culture, Pb and Cd were supplied as 250 μM (particulars in Materials and Methods). Columns labeled with different letters indicate statistically significant differences (P < 0.05, ANOVA, Tukey multiple comparison).