| chalcogen | One of the elements in the same column of the periodic table as oxygen. (09 Oct 1997) |
|---|---|
| chalcogens | The group of elements that form group vi of the periodic table. (12 Dec 1998) |
| chalcone | An organic molecule prepared by aldol condensation of acetophenone andbenzaldehyde. (09 Oct 1997) |
| chalcone isomerase | <enzyme> Required for biosynthesis of flavonoid pigments and isoflavonoid phytoalexins; ubiquitous in all plants studied Registry number: EC 5.5.1.6 Synonym: chalcone-flavanone isomerase (26 Jun 1999) |
| chalcone michael allen | An organic molecule prepared by aldol condensation of acetophenone andbenzaldehyde. (09 Oct 1997) |
| chalcone reductase | <enzyme> Nadph-dependent enzyme from plants; forms 4,2',4'-trihydoxychalcone (6'-deoxychalcone) Registry number: EC 1.1.1.- (26 Jun 1999) |
| chalcosis | Chronic copper poisoning. Synonym: chalkitis. Origin: G. Chalkos, copper, brass Chalcosis lentis, a cataract caused by excessive intraocular copper. Synonym: copper cataract, sunflower cataract. (05 Mar 2000) |
| chalice cell | 1. <pathology> Cell of the epithelial lining of small intestine that secretes mucus and has a very well developed Golgi apparatus. 2. <zoology> Cell type characteristic of larval lepidopteran midgut, containing a potent H ATPase and thought to be involved in maintenance of ion and pH gradients. (10 Oct 1997) |
| chalice sign | <radiology> Dilatation of ureter distal to neoplasm, not seen with calculi or thrombi Synonym: Bergman sign (12 Dec 1998) |
| chalicosis | Pneumoconiosis caused by the inhalation of dust incident to the occupation of stone cutting. Synonym: flint disease. Origin: G. Chalix, gravel (05 Mar 2000) |
| chalinoplasty | An obsolete term for the correction of defects of the mouth and lips, especially of the corners of the mouth. Origin: G. Chalinos, bridle, corner of the mouth, + plastos, formed (05 Mar 2000) |
| chalk | Synonym: calcium carbonate. Origin: L. Calx (05 Mar 2000) |
| chalkitis | Synonym: chalcosis. Origin: G. Chalkos, copper, brass (05 Mar 2000) |
| challenge diet | A diet in which one or more specific substances are included for the purpose of determining whether an abnormal reaction occurs. (05 Mar 2000) |
| chalone | <biochemistry> Cell released tissue specific inhibitor of cell proliferation thought to be responsible for regulating the size of a population of cells. Contentious. (18 Nov 1997) |