实验二 土壤细菌的分离与纯化 一 教学要求 通过从土壤中分离纯化细菌，初步掌握微 生物的分离纯化方法和无菌操作技术。 二 实验原理 - 常用的分离纯化方法 microorganisms exist in nature as mixed populations. However, to study microorganisms in the laboratory we must have them in the form of a pure culture, that is, one in which all organisms are descendants of the same organism.实验二 土壤细菌的分离与纯化 一 教学要求 通过从土壤中分离纯化细菌，初步掌握微 生物的分离纯化方法和无菌操作技术。 二 实验原理 - 常用的分离纯化方法 microorganisms exist in nature as mixed populations. However, to study microorganisms in the laboratory we must have them in the form of a pure culture, that is, one in which all organisms are descendants of the same organism