| nor- | 1. Chemical prefix denoting 1) elimination of one methylene group from a chain, the highest permissible locant being used; 2) contraction of a (steroid) ring by one CH2 unit, the locant being the capital letter identifying the ring. Elimination of two methylene groups is denoted by the prefix dinor-; three groups, by trinor-, etc. 2. Chemical prefix denoting "normal," i.e., unbranched chain of carbon atoms in aliphatic compounds, as opposed to branched with the same number of carbon atoms; e.g., norleucine, leucine. (05 Mar 2000) |
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| NOR-banding | A procedure which utilises a silver stain that preferentially accumulates in the nucleoli-organizing regions, i.e., the satellite regions of the acrocentric chromosomes. (05 Mar 2000) |
| noradrenaline | <drug, hormone> Catecholamine neurohormone, the neurotransmitter of most of the sympathetic nervous system (of so called adrenergic neurons): binds more strongly to _ adrenergic receptors. Stored and released from chromaffin cells of the adrenal medulla. (13 Nov 1997) |
| noradrenaline acid tartrate | norepinephrine bitartrate |
| noradrenaline bitartrate | norepinephrine bitartrate |
| noradrenergic system | The system of nerve cells that uses noradrenaline as its neurotransmitter. (13 Nov 1997) |
| norandrostanes | Androstanes in which ring contractions have occurred or which are lacking carbon-18. Compounds with any degree of unsaturation are included. Androstanes which are lacking carbon-19 are estranes. (12 Dec 1998) |
| norcocaine esterase | <enzyme> Aspect of EC 3.1.1.1,carboxylesterase Registry number: EC 3.1.1.- (26 Jun 1999) |
| nordazepam | <chemical> An intermediate in the metabolism of diazepam to oxazepam. It may have actions similar to those of diazepam. Pharmacological action: anti-anxiety agents, gaba modulators. Chemical name: 2H-1,4-Benzodiazepin-2-one, 7-chloro-1,3-dihydro-5-phenyl- (12 Dec 1998) |
| nordefrin | <chemical> A norepinephrine derivative used as a vasoconstrictor agent. Pharmacological action: vasoconstrictor agents. Chemical name: 1,2-Benzenediol, 4-(2-amino-1-hydroxypropyl)- (12 Dec 1998) |
| nordefrin hydrochloride | Dl-a(1-Aminoethyl)-3,4-dihydrobenzyl alcohol hydrochloride;a sympathomimetic and vasoconstrictor. (05 Mar 2000) |
| Nordhausen sulfuric acid | Sulfuric acid containing sulfurous acid gas in solution. Synonym: fuming sulfuric acid. Origin: named for Nordhausen, a town in Saxony where it was first prepared (05 Mar 2000) |
| nordihydroguaiaretic acid | <chemical> A potent lipoxygenase inhibitor that interferes with arachidonic acid metabolism. The compound also inhibits formyltetrahydrofolate synthetase, carboxylesterase, and cyclooxygenase to a lesser extent. It also serves as an antioxidant in fats and oils. Pharmacological action: antioxidants, cyclooxygenase inhibitors, keratolytic agents, lipoxygenase inhibitors. Chemical name: 1,2-Benzenediol, 4,4'-(2,3-dimethyl-1,4-butanediyl)bis- (12 Dec 1998) |
| norepinephrine | <drug, hormone> Catecholamine neurohormone, the neurotransmitter of most of the sympathetic nervous system (of so called adrenergic neurons): binds more strongly to _ adrenergic receptors. Stored and released from chromaffin cells of the adrenal medulla. (13 Nov 1997) |
| norethandrolone | <chemical> 17-hydroxy-19-norpregn-4-en-3-one. A synthetic hormone with anabolic and androgenic properties and moderate progestational activity. Pharmacological action: anabolic steroids. Chemical name: 19-Norpregn-4-en-3-one, 17-hydroxy-, (17alpha)- (12 Dec 1998) |