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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 Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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 Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.


The orientation or movement of a motile organism with reference to a chemical agent.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
However, the level is sufficient to chemotactically attract Agrobacterium cells but too low to elicit successful vir gene activation.
where w is a cell population, u and v are chemicals, and the cell population responds chemotactically to both chemical species.
C5a has been shown to be chemotactically active for monocytes and PMNL and also promotes the release of free radicals and tissue-digesting enzymes from these cells [23].
It is widely known that recombinant human morphogenetic protein type 2 (rhBMP-2), chosen for this study, is an osteoinductor protein that acts chemotactically in the differentiation of mesenchymal cells into bone synthezed cells, like osteoblasts and chondroblasts (Ducy & Karsenty 2000; Schilephake 2002; Arosarena & Collins 2005).
The virA protein responds chemotactically to certain types of phenolics, such as the C6-C3 phenolic compound, acetosyringone (Davey et al., 1994).