| beta-allopregnanediol | The 5alpha-pregnane-3b,20a(and b)-diols; both are metabolites of progesterone and adrenocortical hormones; found in urine. (05 Mar 2000) |
|---|---|
| beta-aminoisobutyrate:pyruvate aminotransferase | Beta-aminosiobutyrate:pyruvate transaminase;an enzyme that catalyses the reversible transfer of an amino group from beta-aminoisobutyrate to pyruvate, producing l-alanine and methylmalonate saemialdehyde. A step in valine degradation. A deficiency of beta-aminoisobutyrate:pyruvate aminotransferase results in hyper-beta-aminoisobutyric aciduria. (05 Mar 2000) |
| beta-aminoisobutyric acid | 3-Amino-2-methylpropionic acid;an end product of thymine catabolism; high urinary levels (200-300 mg/day) have been noted in some individuals, either from some disease process or following a genetic pattern. (05 Mar 2000) |
| beta-aminoisobutyric acid oxidase | <enzyme> Fad-stimulated, probably forms methylmalonylsaemialdehyde Registry number: EC 1.4.3.- Synonym: baib-oxidase (26 Jun 1999) |
| beta-amylase | <enzyme> An enzyme that catalyses the hydrolysis of 1,4-alpha-glycosidic linkages in starch, glycogen, and related polysaccharides and oligosaccharides so as to remove successive beta-maltose units from the non-reducing ends of the chains. Chemical name: 1,4-alpha-D-Glucan maltohydrolase Registry number: EC 3.2.1.2 (12 Dec 1998) |
| beta-amyloid | <protein> The protein which forms thick deposits, or plaques, in the brains of people with Alzheimer's disease, a disease where memory skills gradually deteriorate with age. (13 Nov 1997) |
| beta angle | The angle formed by a line connecting the bregma and hormion meeting the radius fixus. (05 Mar 2000) |
| beta-aspartyl(acetylglucosamine) | Misnomer for 1-(beta-asparagino)-N-acetylglucosamine or 1-(beta-aspartamido)-N-acetylglucosamine, or, formally, 1-(beta-l-aspartamido)-N-2-acetamido-1,2-dideoxy-beta-d-glucose; a compound of N-acetylglucosamine and asparagine, linked via the amide nitrogen of the latter and carbon-1 of the former. An important structural linkage in many glycoproteins. (05 Mar 2000) |
| beta-aspartyldipeptidase | <enzyme> Catalyses the hydrolytic cleavage of a beta-linked aspartic residue from the n-terminus of a polypeptide; formetly EC 3.4.13.10 Registry number: EC 3.4.19.5 Synonym: beta-aspartylpeptidase, isoaspartyl dipeptidase, beta-aspartyl-peptidase, l-beta-aspartyl dipeptidase (26 Jun 1999) |
| beta blockers | A class of drugs that block the action of adrenaline (a beta adrenergic substance) and can relieve stress to the heart muscle. Beta blockers are often used to slow the heart rate or lower the blood pressure. (12 Dec 1998) |
| beta-carboline-2-N-methyltransferase | <enzyme> Brain enzyme may have a role in development of idiopathic parkinson disease by forming n-methylated beta-carbolinium cations Registry number: EC 2.1.1.- Synonym: betac-2-nmt (26 Jun 1999) |
| beta-carotene | An antioxidant which protects cells against oxidation damage that can lead to cancer. Beta carotene is converted, as needed, to vitamin A. A yellow carotenoid pigment that gives a reddish colour to plants such as carrots and tomatoes. It is often used as a vitamin supplement because the liver can convert it into Vitamin A. Food sources of beta-carotene include vegetables such as carrots, sweet potatoes, spinach and other leafy green vegetables; and fruit such as cantaloupes and apricots. Excessive carotene in the diet can temporarily yellow the skin, a condition called carotenaemia, commonly seen in infants fed largely mushed carrots. (12 Dec 1998) |
| beta-carotene 15,15'-dioxygenase | <enzyme> An enzyme catalyzing the reaction of beta-carotene plus O2 producing two retinals. Synonym: beta-carotene cleavage enzyme, carotenase, carotinase. (05 Mar 2000) |
| beta-carotene cleavage enzyme | <enzyme> An enzyme catalyzing the reaction of beta-carotene plus O2 producing two retinals. Synonym: beta-carotene cleavage enzyme, carotenase, carotinase. (05 Mar 2000) |
| beta-carotene hydroxylase | <enzyme> O2-dependent NADPH-dependent monooxygenase from erwinia herbicola; forms zeaxanthin; amino acid sequence has been determined; genbank m87280 Registry number: EC 1.14.13.- Synonym: beta-carotene monooxygenase, crtz gene product (26 Jun 1999) |