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Chemotactic motion of bacteria

Description
a) In the absence of either attractants or repellents, the bacterium stops and tumbles frequently, each time starting out in a new, random direction.

b) When a gradient of an attractant is present, a bacterium heading toward the attractant tends to run for longer periods without tumbling.

c) A gradient of a repellent has the opposite effect, favoring long runs away from the repellent source.
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