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. 2012 Sep 25;7(9):e46248. doi: 10.1371/journal.pone.0046248

Figure 4. The swimming speed of two alkaliphiles dependent upon pH and concentrations of NaCl and KCl.

Figure 4

The relationship between the swimming speed and several different pH values at 200 mM Na+ (A) or K+ (B) is illustrated. The relationship between swimming speed in 30 mM Tris-HCl containing 5 mM glucose (pH 9.0) and the various indicated concentrations of KCl and NaCl is shown in (C). The red line and red open circles show the data for the B. pseudofirmus OF4 strain, and the blue line and blue filled circles show the data for the B. alcalophilus strain. The swimming speed was determined as described in the Materials and Methods section. The results that are shown represent the averages of three independent experiments in each of which the swimming speeds of 20 independent cells as calculated in each experiment. The error bars indicate the standard deviations of the values.