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Effect of sodium and potassium ions on the growth of B. trypoxylicola, B. alcalophilus, and B. pseudofirmus OF4. Growth of bacterial cultures at 30 °C in Tris medium (pH 9) containing various concentrations of NaCl (A) or KCl (B) was monitored at OD600. The results are the averages of three independent experiments, and the error bars represent the standard deviations.
