| vitamin B3 | <biochemistry> Member of the water soluble B vitamin group, used in the production of fatty acids, steroids and cholesterol, deficiency is known as pellagra. Has cholesterol-lowering and vasodilating properties. (27 Sep 1997) |
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| vitamin B4 | Once believed to be a factor necessary for nutrition of the chick, now identified simply as certain essential amino acids and/or adenine, obsolete term for adenine. (05 Mar 2000) |
| vitamin B5 | Once used to describe biological activities now ascribed to pantothenic acid or nicotinic acid. (05 Mar 2000) |
| vitamin B6 | <biochemistry> Member of the water soluble B vitamin group. Vitamin B6 or pyridoxine, is active in the metabolism of proteins, carbohydrates and fats. It is also a necessary part of haemoglobin synthesis. B6 deficiency results in retarded growth and a peripheral neuropathy. (27 Sep 1997) |
| vitamin B6 deficiency | Member of the water soluble B vitamin group. Vitamin B6 or pyridoxine, is active in the metabolism of proteins, carbohydrates and fats. It is also a necessary part of haemoglobin synthesis. B6 deficiency results in retarded growth and a peripheral neuropathy. (27 Sep 1997) |
| vitamin B6 unit | Potency expressed in terms of weight of pure crystalline pyridoxine. (05 Mar 2000) |
| vitamin B7 | <biochemistry> This vitamin is necessary for the synthesis of various enzymes and actsto reduce blood cholesterol. Adeficiency in this vitamin causes pellagra, which is characterised bydermatitis, diarrhoea, and inflammation of the mucous membranes. (09 Oct 1997) |
| vitamin Bc conjugase | <enzyme> An enzyme catalyzing the hydrolysis of the pteroylpolyglutamic acids to pteroylmonoglutamic acid, with consequent increase in vitamin activity; vitamin Bc is an obsolete term for folic acid. (05 Mar 2000) |
| vitamin b complex | <chemical> A group of water-soluble substances including thiamine, riboflavin, niacin (nicotinic acid), niacinamide (nicotinamide), the vitamin b6 group (including pyridoxine, pyridoxal, pyridoxamine), biotin, pantothenic acid, folic acid, possibly para-aminobenzoic acid, inositol, vitamin b12, and possibly choline. Chemical name: Vitamin B (12 Dec 1998) |
| vitamin BT | <biochemistry> _ Hydroxy _ trimethyl aminobutyric acid. Compound that transports long chain fatty acids across the inner mitochondrial membrane in the form of acyl carnitine. Sometimes referred to as Vitamin Bt or Vitamin B7. (18 Nov 1997) |
| vitamin Bx | A factor in the vitamin B complex, a part of all folic acids and required for its formation; neutralises the bacteriostatic effects of the sulfonamides since it furnishes an essential growth factor for bacteria, the utilization with which the sulfonamides interfere; used as an ultraviolet screen in lotions and creams. Synonym: paraaminobenzoic acid, vitamin Bx. Acronym: PABA (05 Mar 2000) |
| vitamin C | <biochemistry> A water soluble vitamin crucial for the maintenance of connective tissue, wound healing and scar formation. Deficiency is known as scurvy. Symptoms include dry skin, bleeding and swollen gums, bone pains, dental cavities and mouth sores. (27 Sep 1997) |
| vitamin C deficiency | A disease due to the deficiency of vitamin C (ascorbic acid). Symptoms include weakness, anaemia, spongy gums and mucocutaneous bleeding (mouth ulcers). Synonym: scurvy. (27 Sep 1997) |
| vitamin C test | A tourniquet test used to determine presence of vitamin C deficiency or thrombocytopenia; a circle 2.5 cm in diameter, the upper edge of which is 4 cm below the crease of the elbow, is drawn on the inner aspect of the forearm, pressure midway between the systolic and diastolic blood pressure is applied above the elbow for 15 minutes, and a count of petechiae within the circle is made: 10, normal; 10 to 20, marginal zone; over 20, abnormal. See: Rumpel-Leede test. Synonym: capillary resistance test, vitamin C test. (05 Mar 2000) |
| vitamin C unit | The vitamin C activity of 0.05 mg of the standard crystalline levoascorbic acid; 1 mg of crystalline vitamin C provides 20 USP unit's. See: Sherman unit. (05 Mar 2000) |