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FIGURE 1  Superimposed phase-contrast video microscopy images show E. coli cells (HCB437) swimming in circular trajectories near a glass surface. (Left) Superposition of 8 s (240 frames) of video images. (Right) Typical superposition of 2 s (60 frames) of video images that was used to analyze the length and width of cells, the swimming speed of cells, and the radius of curvature of the trajectories.





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