单词	nicotinic acid
释义	nicotinic acid /nɪkəˈtɪnɪk / noun [mass noun] Biochemistry A vitamin of the B complex which is widely distributed in foods such as milk, wheat germ, and meat, and can be synthesized in the body from tryptophan. Its deficiency causes pellagra. Also called niacin. Alternative name: 3-pyridinecarboxylic acid; chemical formula: (C5H4N)COOH. Thus, the enzymes nicotinic acid mononucleotide adenylyltransferase and NAD synthetase are essential for growth of E. coli (coded for by the genes nadD and nadE, respectively).... Blood levels of pantothenic acid were significantly higher in CD patients, and there were no statistically significant differences in levels of vitamins B12 and C, nicotinic acid, and biotin. Because of its ability to cause large reductions in circulating levels of cholesterol, nicotinic acid is used to treat Type II, III, IV and V hyperlipoproteinemias.
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