J acid
lanosterol
| alpha-l-iduronidase | <enzyme> An enzyme that hydrolyzes terminal desulfated alpha-l-iduronic acid residues of dermatan sulfate and of heparan sulfate; a deficiency of this enzyme is associated with Hurler syndrome and Scheie syndrome. (05 Mar 2000) |
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| alpha-macroglobulins | Glycoproteins with a molecular weight of approximately 620,000 to 680,000. Precipitation by electrophoresis is in the alpha region. They include alpha 1-macroglobulins and alpha 2-macroglobulins. These proteins exhibit trypsin-, chymotrypsin-, thrombin-, and plasmin-binding activity and function as hormonal transporters. (12 Dec 1998) |
| alpha-mannosidase | <enzyme> Catalyses hydrolysis of terminal, non-reducing alpha-d-mannose residues in alpha-d-mannosides Registry number: EC 3.2.1.24 Synonym: alpha-d-mannoside mannohydrolase, alpha-d-mannosidase, neutral alpha-mannosidase, alpha mannosidase a, alpha mannosidase b, lysosomal alpha-mannosidase, laman (26 Jun 1999) |
| alpha-methylacyl-CoA racemase | <enzyme> Involved in catabolism of branched-chain fatty acids derived from isoprenoids; acts on pristanoyl-CoA and trihydroxycoprostanoyl-CoA, but not on 3-methyl branched-chain or linear-chain acyl coas; amino acid sequence has been determined; genbank u89905 (rat) and u89906 (mouse); also isolated from human liver Registry number: EC 5.1.99.- Synonym: meac CoA racemase (26 Jun 1999) |
| alpha methyl dopa | <drug> An antihypertensive drug, preferred in pregnant patients. (18 Nov 1997) |
| alpha-methyltyrosine | <chemical> An inhibitor of the enzyme tyrosine 3-monooxygenase, and consequently of the synthesis of catecholamines. It is used to control the symptoms of excessive sympathetic stimulation in patients with pheochromocytoma and decreases the frequency and severity of hypertensive attacks and related symptoms in most patients. (martindale, the extra pharmacopoeia, 30th ed) Pharmacological action: enzyme inhibitors. (12 Dec 1998) |
| alpha-msh | <chemical> A 13-amino acid peptide derived from the anterior pituitary gland in man and from the pars intermedia in lower vertebrates. Its amino acid sequence is identical to the first 13 amino acids of acth. It influences the formation of deposition of melanin in the body and produces colour changes in the skin of amphibians, fishes and reptiles. It is secreted in humans only during foetal life and occasionally during pregnancy. Chemical name: alpha-Melanotropin (pig) (12 Dec 1998) |
| alpha mucase | <chemical> Combination of mucopolysaccharidases and chymotrypsin (26 Jun 1999) |
| alpha-N-acetyl-D-glucosaminidase | <enzyme> Believed to be deficient in sanfilippo syndrome type b Registry number: EC 3.2.1.50 Synonym: alpha-n-acetylglucosaminidase (26 Jun 1999) |
| alpha-N-acetylgalactosaminidase | <enzyme> An enzyme that hydrolyzes 2-acetamido-2-deoxy-alpha-d-galactosides to the alcohol and free 2-acetamido-2-deoxy-d-galactose. A deficiency of this enzyme will result in Schindler disease. (05 Mar 2000) |
| alpha-N-acetylglucosaminidase | <enzyme> An enzyme that hydrolyzes glycosides of N-acetylglucosamine producing the alcohol and N-acetylglucosamine. A deficiency of this enzyme results in mucopolysaccharidosis III B. (05 Mar 2000) |
| alpha-naphthylthiourea | 1-(1-Naphthyl)-2-thiourea;a derivative of thiourea; a highly toxic antithyroid agent, especially to small mammals, causing pulmonary oedema, fatty degeneration of the liver, and low body temperature; used as a rat poison. Acronym: ANTU (05 Mar 2000) |
| alpha-neoagarooligosaccharide hydrolase | <enzyme> Hydrolyzes the alpha-1,3 linkage of neoagarooligosaccharides; from marine bacterium, vibrio sp.; mw 42 kD; amino acid sequence has been determined Registry number: EC 3.2.1.- Synonym: alpha-naos hydrolase (26 Jun 1999) |
| alpha-oxidation | A form of oxidation of fatty acids in which carbons are removed one at a time in the form of CO2; the alpha-carbon is first hydroxylated and then converted into a carbonyl; a deficiency of this pathway is associated with Refsum's disease. (05 Mar 2000) |
| alpha particle | <physics> A radioactive particle made up of two protons and two neutrons, these particles are created by the decay of a radioactive material or by nuclear bombardment, and they are the same as the nucleus of a helium-4 atom. (09 Oct 1997) |