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Effect of sodium and potassium ions on the swimming speed of B. trypoxylicola, B. alcalophilus, and B. pseudofirmus OF4. Swimming speeds of B. trypoxylicola, B. alcalophilus, and B. pseudofirmus OF4 cells were measured in 30 mM Tris-HCl containing 5 mM glucose and several NaCl (A) or KCl (B) concentrations at pH 9.0. The results represent the average swimming speed of 30 independent cells from three independent experiments. The error bars indicate the standard deviations.
