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Effect of addition of nitrate or of nitrate and tNRB on sulfate reduction by tSRB consortia grown at 60°C. Nitrate (A) or nitrate and tNRB (B) were added at T = 0 h (A,B) or at midlog phase of sulfate reduction at T = 45 h (C,D); 100 μl of CSBA medium was added as a control at T = 45 h (E). Data are averages for duplicate incubations.
