| hydroxyfatty acid | A fatty acid that has a hydroxyl group covalently attached to it (e.g., in hydroxynervone). (05 Mar 2000) |
|---|---|
| hydroxyhemin | Same as haematin. Source: Websters Dictionary (01 Mar 1998) |
| hydroxyindole oxidase | <enzyme> P-coumaric acid is hydroxylated to caffeic acid by purified enzyme and hydrogen peroxide is produced Registry number: EC 1.14.99.- (26 Jun 1999) |
| hydroxyindoleacetic acid | <chemical> Chemical name: 1H-Indole-3-acetic acid, 5-hydroxy- (12 Dec 1998) |
| hydroxyisovalerate dehydrogenase | <enzyme> Catalyses the reversible reaction of 2-ketoisovalerate to d-hydroxyisovalerate; consists of a single peptide, mw 53 kD; a highly specific dehydrogenase from fusarium sambucinum Registry number: EC 1.1.1.- Synonym: d-hydroxyisovalerate dehydrogenase, d-hiv dehydrogenase (26 Jun 1999) |
| hydroxykynureninuria | An abnormality in tryptophan metabolism, probably due to a defect in kynureninase, characterised by mild mental retardation, migraine-like headaches, and urinary excretion of large amounts of kynurenine, kynurenine-3-monooxygenase, and xanthurenic acid; autosomal recessive inheritance. (05 Mar 2000) |
| hydroxyl | <chemistry> A compound radical, or unsaturated group, HO, consisting of one atom of hydrogen and one of oxygen. It is a characteristic part of the hydrates, the alcohols, the oxygen acids, etc. Origin: Hydro-, 2 + oxygen + -yl. Source: Websters Dictionary (01 Mar 1998) |
| hydroxyl group | An -OH or alcohol group on a larger molecule. The oxygen is single-bonded to the hydrogen and has one free bond to the rest of the molecule. Molecules with one or more hydroxyl groups are called alcohols. (09 Oct 1997) |
| hydroxyl radical | <chemical> Hydroxyl. The univalent radical oh. This radical is characteristic of hydroxides, oxygen acids, alcohols, glycols, phenols, and hemiacetals. Chemical name: Hydroxyl (12 Dec 1998) |
| hydroxylamine | <chemistry> A nitrogenous, organic base, NH2.OH, resembling ammonia, and produced by a modified reduction of nitric acid. It is usually obtained as a volatile, unstable solution in water. It acts as a strong reducing agent. Origin: Hydroxyl + amine. Source: Websters Dictionary (01 Mar 1998) |
| hydroxylamine dismutase | <enzyme> From extracts of phototropic cultures of phormidium uncinatum; catalyses formation of nitrite and ammonia from h2o2 and nh2oh Registry number: EC 1.7.99.- (26 Jun 1999) |
| hydroxylamine oxidase | <enzyme> Catalyses aerobic oxidation of hydroxylamine to nitrite in the presence of phenazine methosulfate Registry number: EC 1.7.3.4 Synonym: hydroxylamine oxidoreductase, hydroxylaminoxidase (26 Jun 1999) |
| hydroxylamines | Organic compounds that contain the (-nh2oh) radical. (12 Dec 1998) |
| hydroxylamino | The monovalent group, -NH-OH. (05 Mar 2000) |
| hydroxylapatite | <chemistry> The calcium phosphate mineral, Ca10(PO4)6(OH)2, found both in rocks of nonorganic origin and as a component of bone and dentine. Used as column packing for chromatography, particularly for separating double stranded DNA from mixtures containing single stranded DNA. (18 Nov 1997) |
| 4-hydroxy-2-ketovalerate aldolase | <enzyme> Forms acetaldehyde + pyruvate; catalyses conversion of 4-hydroxy-2-ketovalerate to pyruvate Registry number: EC 4.1.3.- (26 Jun 1999) |
|---|---|
| 4-hydroxy-2-oxovalerate aldolase | <enzyme> Forms pyruvate + acetaldehyde; enzyme g of p-cumate catabolic pathway in pseudomonas putida Registry number: EC 4.1.3.- Synonym: nahm gene product, cmtg gene product (26 Jun 1999) |
| 4-hydroxy-5-polyprenylbenzoate hydroxylase | <enzyme> Involved in ubiquinone biosynthesis Registry number: EC 1.14.13.- Synonym: 4-oh-5-ppb hydroxylase (26 Jun 1999) |
| 5-formyl-3-hydroxy-2-methylpyridine-4-carboxylic acid dehydrogenase | <enzyme> Nad+ dependent; from pseudomonas ma-1 grown on pyridoxine; involved in vitamin b6 degradation Registry number: EC 1.1.1.- Synonym: fhmpc dehydrogenase (26 Jun 1999) |
| 5-hydroxy-N-methylpyroglutamic acid synthetase | <enzyme> Methylamine plus alpha-ketoglutarate gives 5-hydroxy-n-methylpyroglutamic acid Registry number: EC 4.2.1.- (26 Jun 1999) |
| 5-hydroxy tryptamine antagonists | Agents which block serotonin receptors and hence interfere with the biological actions of serotonin (5-HT). (05 Mar 2000) |
| 7 alpha-hydroxy-4-cholesten-3-one-12 alpha monooxygenase | <enzyme> Liver microsomal enzyme active in conversion of cholesterol to cholic acid; introduces a 12 alpha-hydroxyl group into the steroid nucleus of cholesterol Registry number: EC 1.14.99.- Synonym: 7-hco-monooxygenase, hco 12 alpha-hydroxylase (26 Jun 1999) |
| 8-hydroxy-2-(di-n-propylamino)tetralin | <chemical> 7-(dipropylamino)-5,6,7,8-tetrahydro-1-naphthalenol. A serotonin 1a-receptor agonist that is being used experimentally to test the effects of serotonin. Pharmacological action: serotonin agonists. Chemical name: 1-Naphthalenol, 7-(dipropylamino)-5,6,7,8-tetrahydro- (12 Dec 1998) |
| 8-hydroxy-5-deazaflavin-dependent DNA photolyase | <enzyme> From anacystis nidulans; purified in streptomyces coelicolor; distinguish from folate-dependent DNA photolyase Registry number: EC 4.1.99.- Synonym: 8-hdfd-DNA photolyase (26 Jun 1999) |
| 8-hydroxy-5-deazaflavin-NADPH oxidoreductase | <enzyme> From streptomyces griseus; mw 42kda; acts as an electron transfer carrier Registry number: EC 1.6.99.- Synonym: hdaf-NADPH oxidoreductase (26 Jun 1999) |