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

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/07/22 21:47:32」(JST)

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Chemo-tropism is the growth of organisms (or parts of an organism, including individual cells) such as bacteria and plants, navigated by chemical stimulus from outside of the organism or organisms part. The response of the organism or organism part is termed ‘positive’ if the growth is towards the stimulus or ‘negative’ if the growth is away from the stimulus.

An example of chemo-tropic movement can be seen during the growth of the pollen tube, where growth is always towards the ovules. It can be also written that conversion of flower into fruit is the example of chemo-tropism.

Fertilization of flowers by pollen is achieved because the ovary releases chemicals that produce a positive chemo-tropic response from the developing pollen tube.

An example of positive and negative chemo-tropism is shown by a plant’s roots; the roots grow towards useful minerals displaying positive chemo-tropism, and grow away from harmful acids displaying negative chemo-tropism.

Another example of chemo-tropic movement of includes the growth of individual neuronal cell axons in response to extra cellular signals, which guide the developing axon to innervate the correct target tissue.Also, the addition of atmospheric nitrogen, also called nitrogen fixation, is an example of chemo-tropism.

Chemo-tropism is different from Chemotaxis, the major difference being that chemo-tropism is related to growth, while chemotaxis is related to locomotion.

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English Journal

A role for melatonin in maintaining the pro- and anti-inflammatory balance by influencing leukocyte migration and apoptosis in carp.

Kepka M1, Szwejser E1, Pijanowski L1, Verburg-van Kemenade BM2, Chadzinska M3.
Developmental and comparative immunology.Dev Comp Immunol.2015 Nov;53(1):179-190. doi: 10.1016/j.dci.2015.07.011. Epub 2015 Jul 15.
Melatonin is responsible for the synchronization of many physiological processes, including the immune response. Here we focus on the expression of melatonin MT1 receptors in/on leukocytes, and on the effects of melatonin administration on the inflammatory processes of carp. For the first time, we s
PMID 26188098

Inhibitory effect of plant phenolics on fMLP-induced intracellular calcium rise and chemiluminescence of human polymorphonuclear leukocytes and their chemotactic activity in vitro.

Nowak PJ1, Zasowska-Nowak A, Bialasiewicz P, de Graft-Johnson J, Nowak D, Nowicki M.
Pharmaceutical biology.Pharm Biol.2015 Nov;53(11):1661-70. doi: 10.3109/13880209.2014.1001403. Epub 2015 Apr 9.
CONTEXT: Polymorphonuclear leukocytes (PMNs) produce oxidants, contributing to systemic oxidative stress. Diets rich in plant polyphenols seem to decrease the risk of oxidative stress-induced disorders including cardiovascular disease.OBJECTIVE: The objective of this study was to examine the in vitr
PMID 25856712

Chemokines and relapses in childhood acute lymphoblastic leukemia: A role in migration and in resistance to antileukemic drugs.

Gómez AM1, Martínez C1, González M2, Luque A1, Melen GJ1, Martínez J3, Hortelano S4, Lassaletta Á1, Madero L1, Ramírez M5.
Blood cells, molecules & diseases.Blood Cells Mol Dis.2015 Oct;55(3):220-7. doi: 10.1016/j.bcmd.2015.07.001. Epub 2015 Jul 2.
We studied whether chemokines may have a role in relapses in childhood acute lymphoblastic leukemia (ALL). We compared the levels of chemokine receptors in marrow samples from 82 children with ALL at diagnosis versus 15 at relapses, and quantified the levels of chemokines in central system fluid (CS
PMID 26227851