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从细菌多样性程度来说,肠道堪称人体内的热带雨林。日前,发表在美国《公共科学图书馆的—生物学》杂志(PLOS-biology)上的一篇文章称,人类肠道内的细菌群落数量是原有认识的10倍以上。单从数量上来说,哺乳动物结肠内的细菌10万亿个(成年人),细菌数量则是细胞的10倍,超过1000万亿个,而这些细菌大多集中在人类消化道中。以前,科学家估算人体细菌种类的方法是从肠道中提取细菌,然后在培养皿上培养,待菌落长出后,再进行计数。利用这种方法得到的数据是,人体内大约有500种菌。但这种方法有个无法弥补的缺陷,只能计算可以在培
From the degree of bacterial diversity, the gut is the body’s rainforest. A few days ago, in an article published in the United States of America’s PLOS-biology, the number of bacterial colonies in the human intestine was more than 10 times that of the original understanding. Quantitatively speaking, there are 10 trillion bacteria in the colon of mammals, 10 times more bacteria than cells, and more than 1,000 trillion bacteria. Most of these bacteria are concentrated in the human digestive tract. Previously, scientists estimated the type of bacteria in the human body by extracting the bacteria from the intestine and culturing them on a Petri dish until the colonies had grown. The data obtained using this method is that there are about 500 kinds of bacteria in the human body. However, this method has an irreparable flaw, can only be calculated in training