vitamin B12

vitamin B12
= cyanocobalamin
a vitamin of the B complex. The form of vitamin B12 with coenzyme activity is 5-deoxyadenosyl cobalamin, which is necessary for the synthesis of nucleic acids, the maintenance of myelin in the nervous system, and the proper functioning of folic acid, another B vitamin. The vitamin can be absorbed only in the presence of intrinsic factor, a protein secreted in the stomach. A deficiency of vitamin B12 affects nearly all the body tissues, particularly those containing rapidly dividing cells. The most serious effects of a deficiency are pernicious anaemia and degeneration of the nervous system. Vitamin B12 is manufactured only by certain microorganisms and is contained only in foods of animal origin. Good sources are liver, fish, and eggs. The daily recommended adult intake is 3–4 μg.

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  • Vitamin B12 — Systematic (IUPAC) name α (5,6 dimethylbenzimidazolyl)coba …   Wikipedia

  • vitamin B12 — n. a B vitamin that is used to treat pernicious anemia. Syn: cobalamin, cyanocobalamin. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • vitamin B12 — vitamin B12. См. витамин В12. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • vitamin B12 — cobalamin (см.). (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • Vitamin B12 — ⇒ Cobalamin …   Deutsch wörterbuch der biologie

  • Vitamin B12 — Strukturformel Coenzym B12 (=AdoCbl): R = 5 Desoxyadenosyl Cyanocobalamin (=Vitamin B12): R = –C≡N Hydroxycobalamin (=Vitamin B12a): R = OH Methylcobalamin (=MeCbl oder MeB12): R = –CH3 …   Deutsch Wikipedia

  • Vitamin B12 — A vitamin important for the normal formation of red blood cells and the health of the nerve tissues. Undetected and untreated vitamin B12 deficiency can lead to anemia and permanent nerve and brain damage. Pernicious anemia is a blood disorder… …   Medical dictionary

  • vitamin B12 — ▪ chemical compound       a complex water soluble organic compound that is essential to a number of microorganisms and animals, including humans. vitamin B12 aids in the development of red blood cells in higher animals. The vitamin, which is… …   Universalium

  • vitamin B12 — noun a B vitamin that is used to treat pernicious anemia • Syn: ↑cobalamin, ↑cyanocobalamin, ↑antipernicious anemia factor • Hypernyms: ↑B complex vitamin, ↑B complex, ↑vitamin B complex, ↑vitamin B …   Useful english dictionary

  • vitamin B12 — A vitamin that is needed to make red blood cells and DNA (the genetic material in cells) and to keep nerve cells healthy. It is found in eggs, meat, poultry, shellfish, milk, and milk products. Vitamin B12, along with folate, may be given to help …   English dictionary of cancer terms

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