FIGURE 1.

Time series of the swimming and rotation of a Caulobacter swarmer cell in M2 salts taken at 500 frames per second. A nonswimming cell out of the focal plane appears as a white spot, serving as a reference position. The swimming cell in the focal plane appears dark, and is noted to move from left to right. Numbers indicate time in milliseconds. The scale bar represents 2 μm. Images of the slight crescent shape indicate the rotation of the cell body. Each revolution of the cell body takes ∼12 ms.