人体必需营养素

人体必需营养素及其功能（一）

Necessary Nutrients for Body and Their Functions ( 1 )

锌和维生素A作为人体必需营养素已被证实具有增强免疫力，抵抗感染的作用。

Zinc and vitamin A are necessary for the normal function of the immune system .

维生素E是一种人体必需的营养素，能够保护机体组织结构的完整性，并在生命发育过程中起重要的作用。

Vitamin E is an important nutrient to protect the integrity of body structure , metabolized mainly in liver .

尽管如此，也要知道这些营养素同样是人体必需的营养素。

However , one should remain aware of the fact they are essential .

这些结果提示，由人体必需的营养素硒与亚油酸合成的硒化亚油酸所组成的多相脂质体具有明显的抗肿瘤作用。

These results suggest that the polyphase liposome containing Se-LA has obvious antitumor effect .

营养学的研究也不支持这种观点，因为核苷酸及其代谢产物均不是人体的必需营养素。

Study of nutriology do not support this viewpoint also , because nucleotides and their metabolizing products are not essential nutrition for the body .

维生素A是一种脂溶性维生素，是人体必需的营养素之一。但维生素A不稳定，且对皮肤有刺激性。

Vitamin A , which is one of the nutrients necessary to human , is a kind of fat-soluble vitamin and is unstable and irritating to skins .

同时，镁具有良好的生物相容性，镁离子是一种人体必需的营养素，因此镁合金作为生物材料具有很好的发展前景。

Magnesium has excellent biocompatibility and is an essential nutrient element for human . So it has good prospects as the biological material . Poor corrosion resistance of magnesium alloys provide a guideline for the development of biodegradable metallic materials in the medical field .