bacterial chemotaxis
The response of bacteria to gradients of attractants or repellents. In a gradient of attractant the probability of deviating from a smooth forward path is reduced if the bacterium is moving up-gradient. Since the opposite is true if moving down-gradient, the effect is to bias displacement towards the source of attractant. Strictly should perhaps be considered a klinokinesis with adaptation.

Dictionary of molecular biology. 2004.

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