| AChRs | Acetylcholine Receptors |
|---|---|
| RA | radioactive; ragocyte; ragweed antigen; rapidly adapting [receptors]; reactive arthritis; reciprocal... |
| HC | hair cell; hairy cell; handicapped; head circumference; head compression; health care; healthy contr... |
| LHI | lipid hydrocarbon inclusion |
| PAH | para-aminohippurate; phenylalanine hydrolase; polycyclic aromatic hydrocarbon; predicted adult heigh... |
| AHH | ARyl hydrocarbon hydroxylase |
|---|---|
| Ah | Aryl hydrocarbon |
| AHR | Aryl hydrocarbon receptor |
| Arnt | Aryl hydrocarbon receptor nuclear translocator |
| ARSA | Aryl sulfatase A |
| receptors, aryl hydrocarbon | Cytoplasmic proteins that bind certain aryl hydrocarbons, translocate to the nucleus, and activate transcription of particular DNA segments. Ah receptors are identified by their high-affinity binding to several carcinogenic or teratogenic environmental chemicals including polycyclic aromatic hydrocarbons found in cigarette smoke and smog, heterocyclic amines found in cooked foods, and halogenated hydrocarbons including dioxins and polychlorinated biphenyls. No endogenous ligand has been identified, but an unknown natural messenger with a role in cell differentiation and development is suspected. (12 Dec 1998) |
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| aryl hydrocarbon hydroxylases | <enzyme> A group of cytochrome p-450 (haem-thiolate) proteins which utilise reduced flavin or flavoprotein as one donor and incorporate one atom of oxygen. They act on many aromatic compounds. They are a component part of the mixed-function oxidase system and are important for the oxidation of many drugs and toxins such as phenobarbital, carcinogens, and insecticide. These enzymes are considered to be an aspect of EC 1.14.14.1. Registry number: EC 1.14.14.- (12 Dec 1998) |
|---|---|
| alkyl and aryl transferases | <enzyme> A somewhat heterogeneous class of enzymes that catalyze the transfer of alkyl or related groups (excluding methyl groups). Registry number: EC 2.5 (12 Dec 1998) |
| aryl | An organic radical derived from an aromatic compound by removing a hydrogen atom. (05 Mar 2000) |
| aryl acylamidase | An amidohydrolase cleaving the acyl group from an anilide by hydrolysis, producing aniline and an acid anion. Synonym: arylamidase. (05 Mar 2000) |
| aryl-alcohol oxidase | <enzyme> Flavoprotein acting on a variety of benzyl, cinnamyl, naphthyl and aliphatic unsaturated alcohols Registry number: EC 1.1.3.7 (26 Jun 1999) |
| aryl-alpha-mannosidase | <enzyme> Act on p-nitrophenyl-alpha-d-mannopyranoside Registry number: EC 3.2.1.- Synonym: aryl-alpha-mannosidase a, aryl-alpha-mannosidase b (26 Jun 1999) |
| aryl sulphatase | <enzyme> Aryl sulphatases A, B and C comprise a group of enzymes originally assayed by their ability to hydrolyze O sulphate esters of aromatic substrates. Aryl sulphatase A, substrate cerebroside 3 sulphate, is deficient in metachromatic leukodystrophy. Aryl sulphatase B, substrate acetylhexosamine 4 sulphate in glycosaminoglycans, is deficient in Maroteaux-Lamy syndrome. Aryl sulphatase C hydrolyses oestrogen sulphates. All three are deficient in multiple sulphatase deficiency. (18 Nov 1997) |
| chlorinated hydrocarbon | A molecules which is almost entirely carbon and hydrogen, but has had at least one chlorine atom introduced to it that has replaced one of the hydrogen atoms. (09 Oct 1997) |
| saturated hydrocarbon | A hydrocarbon that contains the greatest possible number of hydrogen atoms, so that the molecule contains neither rings nor multiple bonds. (05 Mar 2000) |
| hydrocarbon | An organic molecule which consists only of carbon and hydrogen atoms, and no other elements. (09 Oct 1997) |
| Diels hydrocarbon | <biochemistry> A phenanthrene derivative obtained by the dehydrogenation of various steroids. (05 Mar 2000) |
| fluorinated hydrocarbon | A molecule which is almost entirely carbon and hydrogen, but has had at least one fluorine atom introduced to it that has replaced one of the hydrogen atoms. (09 Oct 1997) |
| liquid hydrocarbon | One of a very large group of chemical compounds composed only of carbon and hydrogen. The largest source of hydrocarbons is petroleum. (05 Dec 1998) |
| adrenergic receptors | Reactive components of effector tissues, most of which are innervated by adrenergic postganglionic fibres of the sympathetic nervous system. Such receptor's can be activated by norepinephrine and/or epinephrine and by various adrenergic drugs; receptor activation results in a change in effector tissue function, such as contraction of arteriolar muscles or relaxation of bronchial muscles; adrenergic receptor's are divided into alpha-receptor's and beta-receptor's, on the basis of their response to various adrenergic activating and blocking agents. Synonym: adrenoceptor, adrenoreceptors. (05 Mar 2000) |
| alpha-adrenergic receptors | Adrenergic receptor's in effector tissues capable of selective activation and blockade by drugs; conceptually derived from the ability of certain agents, such as phenoxybenzamine, to block only some adrenergic receptor's and of other agents, such as methoxamine, to activate only the same adrenergic receptor's. Such receptor's are designated as alpha-receptors. Their activation results in physiological responses such as increased peripheral vascular resistance, mydriasis, and contraction of pilomotor muscles. (05 Mar 2000) |
Synonyms : AH Receptor, Aryl Hydrocarbon Receptor, Dioxin Receptor, Polyaromatic Hydrocarbon Receptor, Polyaromatic Hydrocarbon Receptors, Receptors, 2, 3, 7, 8-Tetrachlorodibenzo-p-dioxin, Receptors, Polyaromatic Hydrocarbon, Receptors, TCDD, TCDD Receptor, Receptor, AH
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