Fig. 1. Values for pH, dry cell weight, and sulfate concentration during growth of Acidithiobacillus thiooxidans MET at different initial pH values: (a) pH 2, (b) pH 4, (c) pH 8. Symbols: •, pH; 
, dry cell weight; 
, sulfate.
Fig. 1. Values for pH, dry cell weight, and sulfate concentration during growth of Acidithiobacillus thiooxidans MET at different initial pH values: (a) pH 2, (b) pH 4, (c) pH 8. Symbols: •, pH; , dry cell weight; , sulfate.