一、前言 人体内含有许多微量元素。它们直接影响着人体的生理活动,对人体的健康有着十分重要的意义。例如元素锌,它是许多重要酶的辅基成分,其作用在于控制含酶组织的活力,同时控制核酶和蛋白质的合成速率。微量元素是细胞代谢要素,联系着所有生命过程。较大手术和心肌梗塞的患者,血清中Cu含量上升,Zn含量下降;弱智儿童头发的锌含量较正常儿童偏低。因此 I. Introduction The human body contains many trace elements. They directly affect the body’s physiological activities, the human body has a very important significance. For example, elemental zinc, which is a prosthetic component of many important enzymes, acts to control the viability of enzyme-containing tissues while controlling the rate of ribozyme and protein synthesis. Trace elements are cellular metabolic elements that link all life processes. In patients with major surgery and myocardial infarction, serum Cu levels increased and Zn levels decreased. Zinc levels in mentally retarded children were lower than those in normal children. therefore