chemotaxis

che·mo·tax·is

C0273100 (kē′mō-tăk′sĭs, kĕm′ō-)n. The characteristic movement or orientation of an organism or cell along a chemical concentration gradient either toward or away from the chemical stimulus.

che′mo·tac′tic (-tăk′tĭk) adj.che′mo·tac′ti·cal·ly adv.

chemotaxis

(ˌkɛməʊˈtæksɪs) n (Microbiology) the movement of a microorganism or cell in response to a chemical stimulus ˌchemoˈtactic adj ˌchemoˈtactically adv

che•mo•tax•is

(ˌki moʊˈtæk sɪs, ˌkɛm oʊ-)

n. oriented movement toward or away from a chemical stimulus. [1890–95] che`mo•tac′tic (-tɪk) adj. che`mo•tac′ti•cal•ly, adv.

chemotaxis

the property of some plants and animals of moving toward or away from certain chemicals.See also: Motion

Thesaurus

Noun

chemotaxis - movement by a cell or organism in reaction to a chemical stimulustaxis - a locomotor response toward or away from an external stimulus by a motile (and usually simple) organismnegative chemotaxis - movement away from a chemical stimuluspositive chemotaxis - movement toward a chemical stimulus

Translations

chemotaxis

chemotaxis:

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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Chemotaxis

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.

REFERENCES

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

chemotaxis

[‚kē·mō′tak·səs] (biology) The orientation or movement of a motile organism with reference to a chemical agent.

chemotaxis

enUK

chemotaxis

[ke″mo-tak´sis] list; movement (taxis) in response to the influence of chemical stimulation. adj., adj chemotac´tic.leukocyte chemotaxis the response of leukocytes to products formed in immunologic reactions, wherein leukocytes are attracted to and accumulate at the site of the reaction; a part of the response" >inflammatory response. See also inflammation.

che·mo·tax·is

, positive chemotaxisnegative chemotaxis (kē'mo-tak'sis), 1. Movement of cells or organisms in response to chemicals, whereby the cells are attracted (positive chemotaxis) or repelled (negative chemotaxis) by substances exhibiting chemical properties. 2. The migration of polymorphonuclear leukocytes and macrophages toward higher concentrations of certain fragments of complement. Synonym(s): chemiotaxis, chemotropism [chemo- + G. taxis, orderly arrangement]

chemotaxis

(kē′mō-tăk′sĭs, kĕm′ō-)n. The characteristic movement or orientation of an organism or cell along a chemical concentration gradient either toward or away from the chemical stimulus.

che′mo·tac′tic (-tăk′tĭk) adj.che′mo·tac′ti·cal·ly adv.

che·mo·tax·is

, positive chemotaxis , negative chemotaxis (kē'mō-tak'sis, pozi-tiv, negă-tiv) Movement of cells or organisms in response to chemicals.
Synonym(s): chemotropism.

chemotaxis

The movement of a cell or other living organism in a particular direction as a result of attraction by an increasing concentration of a chemical substance. Cells of the immune system find their prey by this means.

chemotaxis

the orientation of a motile cell or an organism in relation to the presence of a particular chemical, the response to a chemorepellent being negative (moving away) and to a chemoattractant being positive (moving towards). For example, the movement of a wasp towards an attractive odour such as beer would be positive chemotaxis. Cells are able to detect changes in the concentration of the chemical and alter their mobility accordingly For example, bacteria will change their pattern of swimming and tumbling.

che·mo·tax·is

, positive chemotaxis , negative chemotaxis (kē'mō-tak'sis, pozi-tiv, negă-tiv) Movement of cells in response to chemicals, whereby the cells are attracted or repelled by substances exhibiting chemical properties.

chemotaxis

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chemotaxis:

Chemotaxis

REFERENCES

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Words related to chemotaxis

noun movement by a cell or organism in reaction to a chemical stimulus

Related Words