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Ornithine

ornithine

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views updated May 29 2018

ornithine (Orn) An amino acid, H₂N(CH₂)₃CH(NH₂)COOH, that is not a constituent of proteins but is important in living organisms as an intermediate in the reactions of the urea cycle and in arginine synthesis.

A Dictionary of Biology

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ornithine

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views updated May 21 2018

ornithine A non-protein amino acid which, in the liver of vertebrates, contributes to the conversion of ammonia and carbon dioxide into urea.

A Dictionary of Zoology MICHAEL ALLABY

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ornithine

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views updated May 29 2018

ornithine An amino acid that occurs as a metabolic intermediate in the synthesis of urea, but not involved in protein synthesis, so of no nutritional importance.

A Dictionary of Food and Nutrition DAVID A. BENDER

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ornithine

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views updated May 14 2018

ornithine (or-ni-theen) n. an amino acid produced in the liver as a by-product during the conversion of ammonia to urea.

A Dictionary of Nursing

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