| arachidonate lipoxygenases | <enzyme> Enzymes catalyzing the oxidation of arachidonic acid to hydroperoxyarachidonates (hpetes). These products are then rapidly converted by a peroxidase to hydroxyeicosatetraenoic acids (hetes). The positional specificity of the enzyme reaction varies from tissue to tissue. The final lipoxygenase pathway leads to the leukotrienes. Registry number: EC 1.13.11.- (12 Dec 1998) |
|---|---|
| arachidonate monooxygenase | <enzyme> Nadph-dependent enzyme from renal cortex; not inhibited by cyclooxygenase inhibitors; forms 19-hydroxyarachidonate, 20-hydroxyarachidonate, 19-ketoarachidonate and a dicarboxylic acid Registry number: EC 1.14.13.- (26 Jun 1999) |
| arachidonic acid | <biochemistry> An essential dietary component for mammals. The free acid is the precursor for biosynthesis of prostaglandins, thromboxanes, hydroxyeicosatetraenoic acid derivatives including leucotrienes and is thus of great biological significance. Within cells the acid is found in the esterified form as a major acyl component of membrane phospholipids (especially phosphatidyl inositol) and its release from phospholipids is thought to be the limiting step in the formation of its active metabolites. (18 Nov 1997) |
| arachidonic acid 18-hydroxylase | <enzyme> Converts arachidonic acid to 18-hydroxy-5,8,11,14-eicosatetraenoic acid in the presence of NADPH; cytochrome p450 enzyme Registry number: EC 1.14.13.- Synonym: arachidonic acid 18(r)-hydroxylase, arachidonic acid omega 3-hydroxylase (26 Jun 1999) |
| arachidonic acid cascade | Eicosanoid synthetic pathway. (05 Mar 2000) |
| arachidonoyl coenzyme A lysophosphatide acyltransferase | <enzyme> Involved in arachidonate uptake into membrane phospholipids Registry number: EC 2.3.1.- Synonym: arachidonoyl CoA lysophosphatide acyltransferase, a-CoA-l-acyltransferase (26 Jun 1999) |
| arachidonoylethanolamide synthase | <enzyme> Enzyme from rabbit cerebral cortex is coenzyme a- and ATP-independent Registry number: EC 3.5.1.- Synonym: arachidonylethanolamide synthase, anandamide synthase, anandamide amidase (26 Jun 1999) |
| arachidonyl transacylase | <enzyme> Catalyses CoA-independent transfer of arachidonate from phosphatidylcholine to lysoplasmenylethanolamine Registry number: EC 2.3.1.- Synonym: CoA-independent transacylase (26 Jun 1999) |
| arachis oil | Oil extracted from the kernels of one or more cultivated varieties of Arachis hypogaea (family Leguminosae); used as a solvent for intramuscular injections and in the preparation of foods. Synonym: arachis oil. (05 Mar 2000) |
| arachnephobia | <psychology> Morbid fear of spiders. Synonym: arachnophobia. Origin: G. Arachne, spider, + phobos, fear (05 Mar 2000) |
| Arachnia | A genus of nonmotile, nonsporeforming, facultatively anaerobic bacteria (family Actinomycetaceae) containing Gram-positive, non-acid-fast, branched, diphtheroid rods (0.2 to 0.3 by 3.0 to 5.0 um and longer). These organisms produce filamentous microcolonies. Their metabolism is fermentative. Primarily propionic and acetic acids are produced from glucose. Catalase is not produced. The cell wall contains diaminopimelic acid but not arabinose. These organisms are pathogenic for man, causing lacrimal canaliculitis and typical actinomycosis. The type species is Arachnia propionica. Arachnia propionica, a species causing lacrimal canaliculitis and typical actinomycosis; it is the type species of the genus Arachnia. Synonym: Propionibacterium propionicus. (05 Mar 2000) |
| arachnid | <biology> An organism of the class Arachnida in the kingdom Animalia. For example: a spider. (09 Oct 1997) |
| arachnid vectors | Members of the class arachnida, especially spiders, scorpions, mites, and ticks, which transmit infective organisms from one host to another or from an inanimate reservoir to an animate host. (12 Dec 1998) |
| arachnida | <zoology> One of the classes of Arthropoda. They have four pairs of legs, no antennae nor wings, a pair of mandibles, and one pair of maxillae or palpi. The head is usually consolidated with the thorax. The respiration is either by trancheae or by pulmonary sacs, or by both. The class includes three principal orders: Araneina, or spiders; Arthrogastra, including scorpions, etc.; and Acarina, or mites and ticks. Origin: NL, fr. Gr. Spider. Source: Websters Dictionary (01 Mar 1998) |
| arachnidan | <zoology> One of the Arachnida. Origin: Gr. Spider. Source: Websters Dictionary (01 Mar 1998) |