:: 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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     In 1852 Russian botanist D. Ivanov was the first time an infectious extract of tobacco plants infected with mosaic illness. When this extract was passed through a filter that can hold bacteria, filtered liquid is still retain infectious properties. In 1898 the Dutchman Beijerinck coined a new word virus (from the Latin word meaning "Poison") to denote the term contagious nature of some of the filtered plant liquids. Although able to achieved considerable success in obtaining highly purified samples of viruses and found that the chemical nature of this nucleoprotein (nucleic acids associated with proteins), the particles themselves were still elusive and mysterious, because that they were too small, so they can be viewed using a light microscope. That is why the virus and were among the first biological structures that have been studied in the electron microscope immediately after its invention in the 30s this century.

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31.07.2014