| oxo acid | An acid containing a ketone group (-CO-) in addition to the acid group(s); alpha-keto acid refers to a 2-oxo acid (e.g., pyruvic acid); beta-keto acid refers to a 3-oxo acid (e.g., acetoacetic acid), etc. Synonym: oxo acid. Alpha-keto acid dehydrogenase, one of several distinct multienzyme complexes that catalyses the formation of an acyl-CoA derivative, CO2, and NADH from an alpha-keto acid, NAD+, and coenzyme A; maple syrup urine disease results from several different inherited defects in the mitochondrial branched chain alpha-keto acid dehydrogenase complex. (05 Mar 2000) |
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| oxo- | <prefix> Prefix denoting addition of oxygen; used in place of keto-in systematic nomenclature. See: hydroxy-, oxa-, oxy-. (05 Mar 2000) |
| oxo-acid-lyases | <enzyme> Enzymes that catalyze the cleavage of a carbon-carbon bond of a 3-hydroxy acid. Registry number: EC 4.1.3. (12 Dec 1998) |
| oxoacetic acid | OHC-COOH;produced by the action of glycine dehydrogenases upon glycine or sarcosine, or from allantoic acid by allantoicase or via alanine:glyoxylate aminotransferase. Synonym: oxoacetic acid. (05 Mar 2000) |
| oxolamine | 5-(2-Diethylaminoethyl)-3-phenyl-1,2,4-oxadiazole;used for treatment of bronchopulmonary infections. (05 Mar 2000) |
| oxolinic acid | <chemical> 5-ethyl-5,8-dihydro-8-oxo-1,3-dioxolo(4,5-g)quinoline-7-carboxylic acid. Synthetic antimicrobial related to nalidixic acid and used in urinary tract infections. Pharmacological action: anti-infective agents, quinolone, anti-infective agents, urinary. Chemical name: 1,3-Dioxolo(4,5-g)quinoline-7-carboxylic acid, 5-ethyl-5,8-dihydro-8-oxo- (12 Dec 1998) |
| oxonate | <chemistry> A salt of oxonic acid. Source: Websters Dictionary (01 Mar 1998) |
| oxonic | <chemistry> Pertaining to, or designating, a complex nitrogenous acid (C4H5N3O4) not known in the free state, but obtained, in combination with its salts, by a slow oxidation of uric acid, to which it is related. Origin: Prob. Glyoxalic + carbonic. Source: Websters Dictionary (01 Mar 1998) |
| oxonic acid | <chemical> 2,4-dihydroxy-6-carboxy-1,3,5-triazine. Antagonist of urate oxidase. Chemical name: 1,3,5-Triazine-2-carboxylic acid, 1,4,5,6-tetrahydro-4,6-dioxo- (12 Dec 1998) |
| oxonium ion | <chemistry> A positively charged ion that is water with an additional hydrogen atom (H3O). (09 Oct 1997) |
| oxophenarsine hydrochloride | 3-Amino-4-hydroxyphenylarsineoxide hydrochloride;an antisyphilitic and antitrypanosomal agent. (05 Mar 2000) |
| oxosuccinic acid | HOOC-CO-CH2COOH;a ketodicarboxylic acid and important intermediate in the tricarboxylic acid cycle; the product formed when l-aspartic acid acts as an amine donor in transamination reactions. Synonym: ketosuccinic acid, oxosuccinic acid. (05 Mar 2000) |
| oxotremorine | <chemical> A non-hydrolyzed muscarinic agonist used as a research tool. Pharmacological action: muscarinic agonist. Chemical name: 2-Pyrrolidinone, 1-(4-(1-pyrrolidinyl)-2-butynyl)- (12 Dec 1998) |
| oxpecker | <zoology> An African bird of the genus Buphaga; the beefeater. Source: Websters Dictionary (01 Mar 1998) |
| oxprenolol | <chemical> A beta-adrenergic antagonist used in the treatment of hypertension, angina pectoris, arrhythmias, and anxiety. Pharmacological action: adrenergic beta-antagonists, anti-anxiety agents, anti-arrhythmia agents, antihypertensive agents, sympatholytics, vasodilator agents. Chemical name: 2-Propanol, 1-((1-methylethyl)amino)-3-(2-(2-propenyloxy)phenoxy)- (12 Dec 1998) |