| chain-compensated spirometer | A Tissot spirometer in which compensation for change in bell buoyancy is accomplished automatically by a suspending chain of correct mass per unit length. (05 Mar 2000) |
|---|---|
| chaining | Learning related behaviours in a series in which each response serves as a stimulus for the next response. (05 Mar 2000) |
| chair form | The more stable of two conformations assumed by 6-membered cyclic sugars (e.g., the pyranoses) or cyclohexane derivatives, as opposed to boat form. See: Haworth conformational formulas of cyclic sugars. (05 Mar 2000) |
| chalasia | Inhibition and relaxation of any previously sustained contraction of muscle, usually of a synergic group of muscles. Origin: G. Chalao, to loosen (05 Mar 2000) |
| chalaza | In botany terminology, the part of an ovule to which the end of the stalk (funicle) is attached. (09 Oct 1997) |
| chalazion | A cyst within the eyelid due to a plugging of the Meibomian gland (in the eyelid). Treatment includes warm wet compresses. Surgical drainage may be required for those which do not respond to conservative measures. (27 Sep 1997) |
| 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) |