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早在1970年Nielsen等就提出:有11种微量元素是动物或人体营养所必需的,即砷、硼、澳、镉、氟、铅、锂、镍、硅、锡和钒。估计这些微量元素的膳食需要量<1μg/g,通常<50 ng/g,其生理剂量一般是在ng/g或ppb级,故称超微量元素(ultratrace element)。虽然许多超微量元素尚无人体缺乏的资料,但已证实它们是植物生长和高等动物维持生命所必需的,并有迹象表明超微量元素与人类某些原因不明的疾病有关。任何单一的超微量元素缺乏而致人体急性疾病的可能性极小,但这并不否认超微量元素对人体的营养意义。如果一种元素的膳食持续缺乏能致非正
As early as 1970, Nielsen et al. Proposed that 11 kinds of trace elements are necessary for animal or human nutrition, namely arsenic, boron, arsenic, cadmium, fluorine, lead, lithium, nickel, silicon, tin and vanadium. The micronutrients are estimated to have a dietary requirement of <1 μg / g, usually <50 ng / g, and their physiological dose is usually in the ng / g or ppb class and is therefore called the ultratrace element. Although many ultra-trace elements do not have the information they lack, they have been shown to be essential for plant growth and higher animal life, and there are indications that the ultra-trace elements are associated with certain unexplained diseases in humans. It is unlikely that any single trace element deficiency will cause acute illness in humans, but this does not deny the nutritional value of the trace elements to the human body. If an element of the continuous lack of diet can cause non-positive