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一、化学元素和微量化学元素 在相当长的一个时期内,人们只注意到碳、氢、氧、氮、磷、硫等几种必需元素在生物体内形成的一系列复杂有机化合物(如碳水化合物、脂肪、蛋白质、核酸等)及其生物功能。至于其它元素在生物体内情况如何,它们对生命过程有什么作用和影响,却了解甚微。17～18世纪,人们仅发现了铁和碘是人体内必需的微量元素。随着微量元素的测定和分析方法的不断改进,人们发现微量元素的速度越来越快,到20世纪30年代,发现了铜、锰、锌、钴;50年代发现了钼、硒、铬;70年代又发现了氟、锡、钒、硅、镍
First, the chemical elements and trace chemical elements For a long period of time, people only pay attention to a series of complex organic compounds (such as carbohydrates , Fats, proteins, nucleic acids, etc.) and their biological functions. As for the other elements in the body how the situation, what they have on life processes and the impact, but little understanding. From the 17th to the 18th century, only iron and iodine were found to be essential trace elements in the human body. With the continuous improvement of the methods of determination and analysis of trace elements, it was found that the trace elements were getting faster and faster. By the 1930s, copper, manganese, zinc and cobalt were found. In the 1950s, molybdenum, selenium and chromium were found. The 1970s also found fluorine, tin, vanadium, silicon, nickel