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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.
chemotaxis (kÄÂ´mÅtakÂ´sis) , n a response involving movement that is positive (toward) or negative (away from) to a chemical stimulus. chemotaxis, leukocyte, n the phagocytic activity of neutrophils and monocytes in response to chemical factors released by invading microorganisms.eukocyte 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 inflammatory response.