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The toxicity of Cr3+, Cu2+ and Cd2+ to Tetrahymena growth metabolism was studied by microcalorimetry at 28°C, and the growth constant (k), peak time (T) and generation times (TG) were calculated. The metal ion concentrations that resulted in 50 % inhibition (IC50) of population growth were obtained through the dynamic parameters. The results indicated that the order of toxicity was Cd2+ > Cr3+...
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