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在人体的皮肤、粘膜以及与外界相通的呼吸道、消化道里,栖居着大量的微生物群,如细菌、真菌、病毒、噬菌体等等。它们与人体相互依存、相互制约,共同构成了人体的微生态环境。据测定:栖居在人体的微生物总重量达1.2公斤左右,其中绝大部分在肠道内。人体细胞的总数约60万亿个,而各种寄居的微生物总数则达600万亿个以上。人体的皮肤、粘膜、呼吸道等都是微生物栖居的良好场所。这些微生物的数量及活动处于相互平衡状态时,对人体是十分有益的,甚至也是必不可少的。因为这些微生物所含的酶系统及活性物质,有的直接皋与人体的物质代谢和能量代谢过程,有
In the human body’s skin, mucous membranes and the outside world are communicating with the respiratory tract, digestive tract, dwelling a large number of microorganisms, such as bacteria, fungi, viruses, bacteriophages and so on. They interdependence with the human body, mutual restraint, together constitute the human body’s micro-ecological environment. It is determined: the total weight of the microorganisms living in the human body of about 1.2 kg, most of them in the intestine. The total number of human cells is about 60 trillion, while the total number of various colonized microorganisms is more than 600 trillion. Human skin, mucous membranes, respiratory tract, etc. are good places for microbial habitat. The quantity and activity of these microorganisms are very beneficial and even essential to the human body when they are in balance with each other. Because these microorganisms contain enzyme systems and active substances, and some directly Gao and the body’s material metabolism and energy metabolism process, there