Bacteria hair (pilus)
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Last Update: 2021-01-27
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Source: Internet
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Author: User
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is a silky protein appendage, also known as fimbriae, that is more thin, short, straight, hard, and multi-layered than whiplash on the surface of many Gloria-negative bacteria. Its chemical composition is pilin, the hair is not related to movement, can not be seen under the optical mirror, the use of electro-mirror can be observed. The hair can be divided into common pilus and sexpilus.
0.3 to 1.0um in length and 7 nm in diameter. It has the ability to stick to cells (red blood cells, cortical cells) and settle the surfaces of various cells, which are related to the pathogenicity of certain bacteria. Bacteria with sterile hairs are easily excluded by the culver movement, intestinal peristalsis or urine flushing of mucous membrane cells, and lose their hair and pathogenicity.
some bacteria also have 1 to 4 long hairs, thicker than ordinary bacteria hair, hollow tube. Sexual bacterial hair is encoded by the
gene of a breeding factor (ferility factor) carried by
particles, so the sexual bacterial hair is also known as f-bacterial hair. Bacteria with sexual hair are called f bacteria or male bacteria, and bacteria with sterile hair are called f-bacteria or female bacteria. The ability of bacteria to pass dna between bacteria, the toxicity and resistance of bacteria can be transmitted in this way, which is one of the reasons why some intestinal bacteria are prone to drug resistance.
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