| 单词 | 酪氨酸 |
| 释义 | 〔tyrosine〕A white crystalline amino acid, C9H 11NO 3, that is derived from the hydrolysis of proteins such as casein and is a precursor of epinephrine, thyroxine, and melanin. 酪氨酸：一种白色晶体状氨基酸，C9H 11NO 3，从酪蛋白等蛋白质的水解中产生，是肾上腺素、甲状腺素、黑色素的母体 〔phenylketonuria〕A genetic disorder in which the body lacks the enzyme necessary to metabolize phenylalanine to tyrosine. Left untreated, the disorder can cause brain damage and progressive mental retardation as a result of the accumulation of phenylalanine and its breakdown products.苯丙酮尿：一种先天性代谢异常，其机体缺乏将苯丙氨酸代谢成酪氨酸所必需的酶。如果不治疗，这种异常会导致脑损伤和精神抑制，这是苯基丙氨酸沉积和其分解物的产物〔tyrosinase〕A copper-containing enzyme of plant and animal tissues that catalyzes the production of melanin and other pigments from tyrosine by oxidation, as in the blackening of a peeled or sliced potato exposed to air.酪氨酸酶：动植物组织中一种含铜的酶，用氧化的方式催化，从酪氨酸中产生黑色素或其它色素，如在削皮的或削成片的土豆暴露在空气里变黑的过程〔phenylalanine〕An essential amino acid, C6H 5CH 2CH(NH 2)COOH, that occurs as a constituent of many proteins and is normally converted to tyrosine in the human body. It is necessary for growth in infants and for nitrogen equilibrium in adults. 苯丙氨酸：一种基本的氨基酸，C6H 5CH 2CH(NH 2)COOH，是许多蛋白质的组成成分，通常在人体内常转变为酪氨酸。它是婴儿成长和成人的氮平衡所必需的 |
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