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Related to chemotactically: positive chemotaxis, chemotaxin


see taxistaxis
, movement of animals either toward or away from a stimulus, such as light (phototaxis), heat (thermotaxis), chemicals (chemotaxis), gravity (geotaxis), and touch (thigmotaxis). The turning movements of plants in response to stimuli are called tropisms.
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the movement of cells (zoospores, spermatozoids, leukocytes) and freely moving plants and protozoans in response to chemical stimuli. Positive chemotaxis is movement toward the source of the chemical stimulus (along the chemical concentration gradient in air or water); negative chemotaxis is movement away from the source. The phenomenon is known to exist in a number of microorganisms and invertebrates. The movement of insects in response to pheromones may also be regarded as chemotaxis.

The substances that induce chemotaxis vary from organism to organism. For example, cyclic adenosine monophosphate is an aggregating substance for soil myxomycetes of the genus Dictyostelium. Female sexual cells of the aquatic fungus Allomyces release the isoprenoid syrenin, a stimulus of chemotaxis of male sexual cells toward female cells. The mechanism by which a chemical signal is sensed (chemoreception) and the pathway to the corresponding physiological reaction, that is, oriented movement, are not thoroughly understood. Chemotaxis plays a part in the search for food, in fertilization in higher plants and animals, and in phagocytosis.


Behaviour of Microorganisms. London-New York, 1973.
Chemotaxis: Its Biology and Biochemistry. Edited by E. Sorkin. Basel, 1974.


The orientation or movement of a motile organism with reference to a chemical agent.
References in periodicals archive ?
Recent advances demonstrate that the low signal-to-noise ratio is because only capacitated spermatozoa are chemotactically responsive and the percentage of capacitation is low (approximately 10% in humans) (10).
1C and 1D), this substance is an osteoinduction protein that acts chemotactically in the differentiation of mesenchymal cells into bone synthesizing cells (Lee 1997; Ripamonti et al.
Prior to physical contact with root hairs, Rhizobium bacteria in the rhizosphere are chemotactically directed by plant-produced flavonoids toward the root, where subsequent interactions may lead to bacterial infection and nodule formation (Caetano-Anoles et al.