||Bacteria Escherichia coli
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||P.877 left column bottom paragraph:"The energetic expense of maintaining chemotactic movement in E. coli cultures has been calculated to be a small fraction of the total energy available to a bacterium (primary source 24). This allows E. coli, and presumably other bacteria, to move continuously in random walks biased toward an attractant. For this to produce chemotaxis, a 1- or 2-µm bacterium must produce enough power to swim at least 30 µm/sec to compensate for rotation from Brownian motion and diffusion of the attractant (primary sources 5, 24)."