Unidirectional, intermittent rotation of the flagellum of Rhodobacter sphaeroides.

  title={Unidirectional, intermittent rotation of the flagellum of Rhodobacter sphaeroides.},
  author={Judith P. Armitage and Robert M. Macnab},
  journal={Journal of bacteriology},
  volume={169 2},
The single flagellum of the photosynthetic bacterium Rhodobacter sphaeroides was found to be medially located on the cell body. Observation of free-swimming bacteria, and bacteria tethered by their flagellar filaments, revealed that the flagellum could only rotate in the clockwise direction; switching of the direction of rotation was never observed. Flagellar rotation stopped periodically, typically several times a minute for up to several seconds each. Reorientation of swimming cells appeared… CONTINUE READING

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