厌氧菌是指一种不能在有氧环境中生长繁殖的细菌。其生长主要靠物质的无氧酵解。过去仅知道少数几种如破伤风杆菌、产气荚膜杆菌、肉毒梭菌等为有芽胞的厌氧菌。近十年来由于厌氧菌培养方法的进展,厌氧菌的发现迅速增多,且已成为细菌学的新分枝。厌氧菌是正常菌群的主要组成部份,品种繁多,数量巨大,人体肠道内厌氧菌有100多种。如每克干粪便中可有1000～10000亿个细菌,其中90%以上为厌氧菌,比需氧菌多100～1000倍。自然 Anaerobic bacteria refers to a bacteria that can not grow and reproduce in an aerobic environment. Its growth mainly depends on the material’s anaerobic glycolysis. In the past only know a few such as Clostridium tetani, Clostridium perfringens, Clostridium botulinum spores and other anaerobic bacteria. In recent ten years due to the progress of anaerobic culture methods, the discovery of anaerobic bacteria has rapidly increased and has become a new branch of bacteriology. Anaerobic bacteria is the main component of normal flora, a wide variety, a huge number of human intestinal anaerobic bacteria have more than 100 kinds. Such as per gram of dry excrement can have 1000 to 1 trillion bacteria, of which more than 90% of anaerobic bacteria, aerobic bacteria more than 100 to 1000 times. natural