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Effect of Pb or Cd on total protein content (mg mL-1PCV) inChlorella sorokinianacells after 2 and 24 h. Data are means ± SE (n = 3). 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).
