| 单词 |
phenylalanine |
| 释义 |
phenylalanine Biochem.|ˈfɛnɪl-, fiːnaɪlˈæləniːn|
[ad. G. phenylalanin (Erlenmeyer & Lipp 1883, in Ann. d. Chem. u. Pharm. CCXIX. 186), f. phenyl phenyl + alanin alanine.]
A colourless, crystalline amino-acid, C6H5CH2·CH(NH2)COOH, which, in its lævorotatory form, is widely distributed in plant proteins and is an essential constituent of the human diet.
1883Jrnl. Chem. Soc. XLIV. 992 Phenyl-α-amidoproprionic acid (phenylalanine),..obtained as a hydrochloride by pouring the crude product of the action of ammonia on phenylethylidine cyanhydrin into hydrochloric acid, and boiling the mixture. 1934Times Lit. Suppl. 1 Nov. 758/3 Whether this represents a real ability to synthesize the amino-acid for all purposes, or simply a power to use dietary phenylalanine, remains an open question. 1955Sci. News Let. 22 Jan. 52/1 Since phenylalanine poisoning caused the mental deficiency, Dr. Woolf decided to try devising a diet that would not contain this amino acid. 1956[see dopa]. 1970Observer 12 Apr. 25/4 Because he lacks a single pair of genes out of all those thousands, his liver cannot convert a chemical in his diet, called phenylalinine, into another chemical, tyrosine, and soon after birth he will start sliding down into severe mental retardation unless his diet is strictly controlled. 1970[see phenylketonuria]. |
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