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Introduction to Microbiology
Staining Microbes for Shape and Arrangement
Description
Simple staining helps reveal the size, shape, and arrangement of microorganisms under the microscope. It uses one dye to color the whole cell. That creates strong contrast between the cells and the background.
A careful preparation step comes first. A small drop of microbial culture is spread on ...
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Transcript
显微镜染色通过区分微生物的内部和外部结构,增强其可见性。
简单染色法使用单一染料来突出细胞的大小、形状和基本特征。
固定是保存细胞形态并在染色前固定结构的关键步骤。
热固定常用于光学显微镜下细菌和古菌样品的制备。
进行简单染色时,将微生物培养物的薄涂片涂布在载玻片上,晾干后进行热固定。
然后用碱性染料(如结晶紫、亚甲蓝或沙黄)对载玻片染色1至2分钟。
染色后,用清水冲洗玻片以去除多余的染料,并用吸水纸吸干。
带正电荷发色团的碱性染料通过静电吸引与细胞中的负电荷组分(如核酸和细胞壁)结合。
这会在清晰的背景上产生颜色鲜艳的细胞,使微生物的形态和排列更易于观察。
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