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Microbiol Immunol. 1995;39(10):741-4.

The measurement of swimming velocity of Vibrio cholerae and Pseudomonas aeruginosa using the video tracking methods.

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Department of Bacteriology, Faculty of Medicine, Kyushu University, Fukuoka, Japan.


The swimming velocities of two monotrichous flagellated bacteria were measured by a computer-assisted video tracking method. Tracing the moving path of the individual bacterium revealed that the bacterial cell did not swim continuously in a straight direction, but frequently changed swimming direction and velocity. The average swimming velocities calculated from the 3-sec path were 75.4 +/- 9.4 microns/sec in four strains of Vibrio cholerae and 51.3 +/- 8.4 microns/sec in five strains of Pseudomonas aeruginosa. These results suggest that V. cholerae swim faster than P. aeruginosa at 30 C in nutrient broth. This method is useful for a detailed analysis of bacterial movement and moving patterns in different environmental conditions.

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