| regulatory region | <molecular biology> A DNA base sequence that controls gene expression. (14 Oct 1997) |
|---|---|
| regulatory regions or sequences | A DNA base sequence that controls gene expression. (05 Mar 2000) |
| regulatory sequence | <molecular biology> DNA sequence to which regulatory molecules such as promotors or enhancers bind, thereby altering the expression of the adjacent gene. (18 Nov 1997) |
| regulatory sequences, nucleic acid | DNA sequences involved in regulating the expression of other genes. (12 Dec 1998) |
| regulatory T-cell | <immunology> Vague term for any class of T lymphocyte not directly involved in the effector side of immunity, but involved in controlling responses and actions of other cells, especially T helper and T suppressor cells. (18 Nov 1997) |
| reguline | <chemistry> Of or pertaining to regulus. Origin: Cf. F. Regulin. See Regulus. Source: Websters Dictionary (01 Mar 1998) |
| regulize | <chemistry> To reduce to regulus; to separate, as a metal from extraneous matter; as, to regulize antimony. Source: Websters Dictionary (01 Mar 1998) |
| regulon | <molecular biology> A situation in which two or more spatially separated genes are regulated in a coordinated fashion by a common regulator molecule. (18 Nov 1997) |
| regulus | Origin: L, a petty king, prince, dim. Of rex, regis, a king: cf. F. Regule. See Regal. 1. A petty king; a ruler of little power or consequence. 2. <chemistry> The button, globule, or mass of metal, in a more or less impure state, which forms in the bottom of the crucible in smelting and reduction of ores. The name was introduced by the alchemists, and applied by them in the first instance to antimony. I signifies little king; and from the facility with which antimony alloyed with gold, these empirical philosophers had great hopes that this metal, antimony, would lead them to the discovery of the philosopher's stone. 3. <astronomy> A star of the first magnitude in the constellation Leo; called also the Lion's Heart. Source: Websters Dictionary (01 Mar 1998) |
| regurgitant | Regurgitating; flowing backward. (05 Mar 2000) |
| regurgitant fraction | The amount of blood regurgitated into a cardiac chamber divided by the stroke output; normally, no blood regurgitates; in patients with severe valvular lesions such as mitral or aortic insufficiency, regurgitation can approach 80%; this fraction affords a quantitative measure of the severity of the valvular lesion. (05 Mar 2000) |
| regurgitant murmur | A murmur due to leakage or backward flow at one of the valvular orifices of the heart. (05 Mar 2000) |
| regurgitate | To be thrown or poured back; to rush or surge back. "The food may regurgitatem the stomach into the oesophagus and mouth." (Quain) Source: Websters Dictionary (01 Mar 1998) |
| regurgitation | <cardiology, gastroenterology> A backward flowing, as the casting up of undigested food or the backward flowing of blood into the heart or between the chambers of the heart when a valve is incompetent. Origin: L. Gurgitare = to flood (18 Nov 1997) |
| regurgitation jaundice | Jaundice due to biliary obstruction, the bile pigment having been conjugated and secreted by the hepatic cells and then reabsorbed into the bloodstream. (05 Mar 2000) |