Online Dictionary of Invertebrate Zoology: Complete Work - Best Text

Online Dictionary of Invertebrate Zoology 191chemodifferentiation n. [Gr. chemeia, pert. chemistry; L.differens, dissimilar] The chemical change in cells precedingtheir visible characteristic difference in embryonic development.chemoheterotroph n. [Gr. chemeia, pert. chemistry; heteros,different; trophe, nourishment] An organism that uses organiccompounds as both energy and a carbon source.chemokinesis n. [Gr. chemeia, pert. chemistry; kinesis,movement] Increased movement of an organism due tothe presence of a chemical substance. chemokinetic a.chemoreceptor n. [Gr. chemeia, pert. chemistry; L. receptor]A sense organ stimulated by chemical substances that maybe perceived as smell (olfaction) or direct contact.chemoreflex n. [Gr. chemeia, pert. chemistry; L. reflexus,bent or turned back] A reflex as a result of chemicalstimulus.chemosensory a. [Gr. chemeia, pert. chemistry; L. sensus,sense] Being sensitive to chemical stimuli. see chemoreceptor.chemosynthesis n. [Gr. chemeia, pert. chemistry; synthesis,composition] 1. Synthesis of organic chemical compoundsin organisms. 2. A type of autotrophic nutrition throughwhich organisms obtain their energy by oxidation of variousinorganic compounds instead of from light. see photosynthesis.chemotaxis n.; pl. -taxes [Gr. chemeia, pert. chemistry;taxis, arrangement] Movement of a motile organism or cellin response to chemical stimulus. a. Positive chemotaxis:movement toward the stimulus; chemotropism. b. Negativechemotaxis: movement from the stimulus. see taxis, tropism.chemotropism n. [Gr. chemo, pert. chemistry; trope, turn]Reaction induced by a chemical stimulus. see tropism.chevron n. [Gr. chevron, rafter] (ANN: Polychaeta) A V-shapedblack, chitinous jaw piece at the base of the eversiblepharynx of some Glyceridae.chevron groove (MOLL: Bivalvia) A V-shaped furrow on thecardinal area for ligament insertion.