| neutral oxide | An oxide that is neither an acid nor a base; e.g., water (hydrogen oxide, H2O). Synonym: indifferent oxide. (05 Mar 2000) |
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| nitric oxide | <biochemistry> This compound is produced from L arginine by the enzyme nitric oxide synthase. Acts as a potent vasorelaxant via elevation of intracellular cGMP in vascular smooth muscle. Synthesis of nitric oxide is not confined to endothelium, isoforms of nitric oxide synthase are also found in brain, neutrophils and platelets. Synonym: endothelium derived relaxation factor. Acronym: NO (29 Dec 1997) |
| nitric-oxide reductase | <enzyme> Prior to 1992 was classified as EC 1.7.99.2; a cytochrome bc complex; genbank af002217 (norb protein) and af002661 (norz protein) are from alcaligenes eutrophus Registry number: EC 1.7.99.7 Synonym: nitric oxide reductase, norb gene product, norz gene product (26 Jun 1999) |
| nitric oxide synthase | <enzyme> An enzyme that catalyses the conversion of l-arginine, NADPH, and oxygen to citrulline, nitric oxide, and NADP+. The enzyme found in brain, but not that induced in lung or liver by endotoxin, requires calcium.There are two isoforms, one constitutive and one activated by calmodulin. Chemical name: L-Arginine,NADPH:oxygen oxidoreductase (nitric-oxide-forming) Registry number: EC 1.14.13.39 Acronym: NOS (12 Dec 1998) |
| nitrous oxide | <chemical> Nitrogen oxide (n2o). A colourless, odourless gas that is used as an anaesthetic and analgesic. High concentrations cause a narcotic effect and may replace oxygen, causing death by asphyxia. It is also used as a food aerosol in the preparation of whipping cream. Pharmacological action: aerosol propellants, analgesics, non-narcotic, anaesthetics, inhalation. Chemical name: Nitrogen oxide (N2O) (12 Dec 1998) |
| sulfuric oxide | SO3;forms sulfuric acid, H2SO4, by its reaction with water. Synonym: sulfuric oxide. (05 Mar 2000) |
| sulfurous oxide | <chemical> A highly toxic, colourless, nonflammable gas. It is used as a pharmaceutical aid and antioxidant. It is also an environmental air pollutant. Pharmacological action: air pollutants, environmental, antioxidants, pharmaceutic aid. Chemical name: Sulfur dioxide (12 Dec 1998) |
| deuterium oxide | <radiobiology> Heavy water, in which the hydrogen is replaced by deuterium. Will stabilise assembled microtubules. (18 Nov 1997) |
| imipramine N-oxide reductase | <enzyme> Reduces imipramine n-oxide to imipramine in the presence of menaquinone Registry number: EC 1.7.99.- (26 Jun 1999) |
| indifferent oxide | An oxide that is neither an acid nor a base; e.g., water (hydrogen oxide, H2O). Synonym: indifferent oxide. (05 Mar 2000) |
| oxide | <chemistry> Any element (but especially a metal) that has formed a binary compound with oxygen. (09 Oct 1997) |
| tin oxide | SnO2;used in industry; it is a cause of pneumoconiosis. Synonym: tin oxide. (05 Mar 2000) |
| eserine oxide | An alkaloid from the seed of Physostigma; a parasympathomimetic agent. Synonym: eserine aminoxide, eserine oxide. (05 Mar 2000) |
| ethylene oxide | <chemical> Chemical name: Oxirane (12 Dec 1998) |
| ethyl oxide | CH3CH2OCH2CH3;a flammable, volatile organic solvent used in extraction procedures; formerly widely used as an inhalation anaesthetic; shortcomings include: irritating vapor, slow onset and prolonged recovery phase, explosion hazard. Synonym: ethyl ether, ethyl oxide, sulfuric ether. (05 Mar 2000) |