Pili or fimbriae :: Viruses and bacteria


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11.09.2013
Resistance of bacteria to environmental factors

    

On the life of the bacteria affect the temperature, humidity, ultraviolet radiation. For low temperatures the bacteria stable, even if some survive -190.5, -253.5 and disputes in the.
For low temperatures the bacteria stable, even if some survive -190.5, -253.5 and disputes in the.

 

 

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Pili or fimbriae

   In the cell wall of certain Gram-negative bacteria are seen thin protuberances (rod-shaped protein projections), which called fimbriae or drink. They are shorter and thinner than flagella and are used for attachment of cells to each other or to some surface, giving a specific "stickiness" to strains that possess them. Pili are different tipa.Naibolee interested in the so-called F-drinking, which are encoded by a special plasmid and are associated with sexual reproduction of bacteria.
    Plasma membrane, mesosoma and photosynthetic membranes Like all cells, the protoplasm of bacteria surrounded by a semipermeable membrane. The structure and functions of the plasma membrane bacteria do not differ from the membranes of eukaryotic cells. In Dumb bacterial plasma membrane invaginates into the cells to form the mesosoma and (or) the photosynthetic membrane. Mesosoma - folded membrane structures on the surface which are enzymes involved in the process of respiration. Consequently, the mesosoma can be called primitive organelles. During cell division, mesosoma bind to DNA, which apparently facilitates the separation of two daughter DNA molecules after replication and promotes the formation of the partition between the daughter cells. In photosynthetic bacteria and saccate, tubular or lamellar plasma membrane invaginations are photosynthetic Pigments (including bacteriochlorophyll). Similar membranous structures are involved in nitrogen fixation.

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19.12.2014