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微量元素锌为人体必需的一种营养成分,它参加细胞几乎所有的代谢过程,是多种金属酶的组成成分。例如RNA-依赖DNA聚合酶和胸腺嘧啶核苷激活酶等,后者可影响蛋白质和核酸的合成,因而锌参与蛋白质和核酸的新陈代谢,与细胞的分裂和功能有密切关系。一个70kg体重的成年人,全身组织锌含量约2～3g。体内锌大部分存在于各种蛋白质中,肌肉、骨和皮肤最多,也存在于血浆、红细胞、白细胞和血小板中。正常情况下,50岁以前血锌水平相对恒定,超过50岁则随着年龄的增加而减少。很多疾病如慢性白血病、
Trace elements Zinc is a necessary human nutrition, it participates in almost all cellular metabolic processes, is a variety of metal enzyme composition. For example, RNA-dependent DNA polymerase and thymidine kinase, the latter can affect the protein and nucleic acid synthesis, thus zinc involved in protein and nucleic acid metabolism, and cell division and function are closely related. A 70kg body weight of adults, systemic zinc content of about 2 ~ 3g. Most of the zinc in the body is found in various proteins, most of which are found in the muscles, bones, and skin, as well as in plasma, red blood cells, white blood cells, and platelets. Under normal circumstances, before the age of 50 blood zinc levels are relatively constant, more than 50 years old with age increases. Many diseases such as chronic leukemia,