Bacterial capsule
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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The cell capsule is a very large structure of some prokaryotic cells, such as bacterial cells. It is a layer that lies outside the cell wall of bacteria. It is a well organized layer, not easily washed off, and it can be the cause of various diseases. It is usually composed of polysaccharides, but could be composed of other materials (e.g., polypeptide in B.anthracis). Because most capsules are water soluble, they are difficult to stain using standard stains because…mehr

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Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The cell capsule is a very large structure of some prokaryotic cells, such as bacterial cells. It is a layer that lies outside the cell wall of bacteria. It is a well organized layer, not easily washed off, and it can be the cause of various diseases. It is usually composed of polysaccharides, but could be composed of other materials (e.g., polypeptide in B.anthracis). Because most capsules are water soluble, they are difficult to stain using standard stains because most stains do not adhere to the capsule. For examination under the microscope, the bacteria and their background are stained darker than the capsule, which doesn''t stain. When viewed, bacterial cells as well as the surface they are on, are stained dark, while the capsule remains pale or colorless and appears as a ring around the cell.