| dihydro- | <prefix> Prefix indicating the addition of two hydrogen atoms. Origin: G. Di, two + hydr, water (05 Mar 2000) |
|---|---|
| dihydro-beta-erythroidine | <chemical> Dihydro analog of beta-erythroidine, which is isolated from the seeds and other plant parts of erythrina sp. Leguminosae. It is an alkaloid with curarimimetic properties. Chemical name: 16(15H)-Oxaerythrinan-15-one, 1,6-didehydro-14,17-dihydro-3-methoxy-, (3beta)- (12 Dec 1998) |
| dihydro-orotate | <biochemistry> An intermediate in the biosynthesis of pyrimidines. Chemical name: L-5,6-dihydroorotate (21 Jun 2000) |
| dihydroalprenolol | <chemical> Hydrogenated alprenolol derivative where the extra hydrogens are often tritiated. This radiolabelled form of alprenolol, a beta-adrenergic blocker, is used to label the beta-adrenergic receptor for isolation and study. Pharmacological action: adrenergic beta-antagonists, anti-arrhythmia agents, antihypertensive agents, sympatholytics. Chemical name: 2-Propanol, 1-((1-methylethyl)amino)-3-(2-propylphenoxy)- (12 Dec 1998) |
| dihydroanisoin dehydrogenase | <enzyme> Catalyses the NADH-dependent reduction of the carbonyl group of benzoin and anisoin; oxidoreductases from pseudomonas fluorescens biovar i Registry number: EC 1.1.1.- (26 Jun 1999) |
| dihydroascorbic acid | The immediate precursor of ascorbic acid in those animals capable of ascorbic acid biosynthesis. Synonym: dihydroascorbic acid, l-gulono-gamma-lactone. L-gulonolactone oxidase, the enzyme catalyzing the conversion of l-gulonolactone and O2 to H2O2 and l-xylo-hexulonolactone, a precursor of ascorbic acid; absent in primates. (05 Mar 2000) |
| dihydrobenzophenanthridine oxidase | <enzyme> Copper-containing oxidase from sanguinaria canadensis; converts dihydrophenanthridines to the corresponding alkaloids, sanguinarine or chelerythrine; requires oxygen, does not contain flavins or pyridine nucleotides; inhibited by thiols Registry number: EC 1.3.3.- Synonym: dihydrosanguinarine oxidase, dihydronorsanguinarine oxidase, dihydrochelerythrine oxidase (26 Jun 1999) |
| dihydrobiopterin | Precursor to tetrahydrobiopter, a required cofactor for a number of enzymes, including the biosynthesis of l-tyrosine; the inability to synthesise dihydrobiopterin can result in a form of malignant hyperphenylalaninaemia. (05 Mar 2000) |
| dihydrobiopterin reductase | <enzyme> An enzyme that catalyses the reduction of 6,7-dihydropteridine to 5,6,7,8-tetrahydropteridine. Chemical name: NAD(P)H:6,7-dihydropteridine oxidoreductase Registry number: EC 1.6.99.7 (12 Dec 1998) |
| dihydroceramide desaturase | <enzyme> Catalyses conversion of dihydroceramide to ceramide Registry number: EC 1.3.1.- (26 Jun 1999) |
| dihydrocodeine tartrate | 6-Hydroxy-3-methoxy-N-methyl-4,5-epoxymorphinan bitartrate;an analgesic derivative of codeine, about one-sixth as potent as morphine; a narcotic antitussive. (05 Mar 2000) |
| dihydrocodeinone | <chemical> Narcotic analgesic related to codeine, but more potent and more addicting by weight. It is used also as cough suppressant. Pharmacological action: analgesics, opioid, antitussive agents, narcotics. Chemical name: Morphinan-6-one, 4,5-epoxy-3-methoxy-17-methyl-, (5alpha)- (12 Dec 1998) |
| dihydrocortisol 3alpha-oxidoreductase | <enzyme> Forms 3alpha,5beta tetrahydrocortisol; prefers NADPH Registry number: EC 1.1.1.- Synonym: dhc-3-oxidoreductase (26 Jun 1999) |
| dihydrocortisone | 17a,21-Dihydroxy-5b-pregnane-3,11,20-trione;a metabolite of cortisone, reduced at the 4,5 double bond. (05 Mar 2000) |
| dihydroergocornine | An ergot alkaloid derivative prepared by the hydrogenation of ergocornine and less toxic than the latter. See: dihydroergotoxine mesylate. (05 Mar 2000) |
| 2,3-dihydroxy-2,3-dihydro-p-cumate dehydrogenase | <enzyme> Catalyses conversion of cis-2,3-dihydroxy-2,3-dihydro-p-cumate to 2,3-dihydroxy-p-cumate; enzyme b of p-cumate catabolic pathway in pseudomonas putida Registry number: EC 1.3.1.- Synonym: cmtb gene product (26 Jun 1999) |
|---|---|
| 7,8-dihydro-7,8-dihydroxybenzo(a)pyrene 9,10-oxide | <chemical> 7,8,8a,9a-tetrahydrobenzo(10,11)chryseno (3,4-b)oxirene-7,8-diol. A benzopyrene derivative with carcinogenic and mutagenic activity. Pharmacological action: carcinogens, mutagens. Chemical name: Benzo(10,11)chryseno(3,4-b)oxirene-7,8-diol, 7,8,8a,9a-tetrahydro- (12 Dec 1998) |