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Related to chemotaxis: geotaxis, positive 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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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 ?
In QBFO, chemotaxis operation is not performed as same as original BFO [36] because Q-bacteria can be in quantum superposition state.
11,12) The suppression of neutrophil chemotaxis and phagocytosis has been described.
Previous investigations (22) showed that LTB4 is the strongest LT triggering inflammation induced by SMU, by having a significant effect on the chemotaxis and activation of neutrophils (4, 23).
TTP LabTech offers a high throughput solution for chemotaxis research using the Acumen eX3 microplate cytometer and the iuvo Chemotaxis Assay Plate from BellBrook Labs.
CCR5 plays a role in mediating leukocyte chemotaxis in response to its ligands, which include RANTES, MIP-1a, and MIP-1b.
The methods include experimental procedures for visualizing and measuring migration behaviors of different kinds of organisms; methods for studying signal transduction pathways involved in chemotaxis in D.
Montague [19] first applied chemotaxis algorithm for optimization of feed profiles to fed batch bioreactors.
These proteins demonstrate remarkable similarity to the chemotaxis proteins of enterics and the gliding bacterium Myxococcus xanthus and are thought to be part of a signal transduction system that controls P.
19) Zinc has an anti-inflammatory effect on cutaneous lesions; this appears to be due to inhibition of polymorphonuclear leukocyte chemotaxis induced by reduced granulocyte zinc levels.
However, unlike several other parasites with plasma membrane ANT, Leishmania uses its plasma membrane ANT not to take up ATP from its host but rather as part of a chemotaxis response.
CC chemokine receptor 5 (CCR5) is involved in the chemotaxis of leukocytes towards inflammatory sites (Baggiolini, 1998), and is present only in certain cell types, such as lymphocytes, dendritic cells and macrophages (Loetscher et al.
Chemotaxis slide allows the motion tracking of slow migrating cells like chemotactic active cancer cells in gradients.