实验一 细菌的革兰氏染色 一 教学要求 了解不同的细菌染色方法的原理，掌握革兰氏 染色方法的操作技术。 二 实验原理 1、染色方法 Since bacteria are almost colorless and therefore show little contrast with the broth in which they are suspended, they are difficult to observe when unstained. Staining microorganisms enables one to: -see greater contrast between the organism and the background, differentiate various morphological types (by shape, arrangement, gram reaction, etc.), -observe certain structures (flagella, capsules, endospores, etc.)实验一 细菌的革兰氏染色 一 教学要求 了解不同的细菌染色方法的原理，掌握革兰氏 染色方法的操作技术。 二 实验原理 1、染色方法 Since bacteria are almost colorless and therefore show little contrast with the broth in which they are suspended, they are difficult to observe when unstained. Staining microorganisms enables one to: -see greater contrast between the organism and the background, differentiate various morphological types (by shape, arrangement, gram reaction, etc.), -observe certain structures (flagella, capsules, endospores, etc.)