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Lower plants Algae and mushrooms [#] Navigation Main Virus Department drobyanka Algae Friends Харьков посуточно: аренда жилья посуточно харьков . Аренда квартир. Recommend Готовая фирма за 15 минут Выбор - готовые ооо . Viruses Viruses - a large group of organisms that differ very small in size (as a rule, less than 200 nm), the lack of cellular structure and облигатно-parasitic way of living. In connection with the fact that viruses cannot be seen with the light microscope and grow on artificial nutrient media, and their detection and study of the present great difficulties. They cause severe diseases of plants, animals and humans, and therefore attracted attention. The first discovered at the turn of XIX and XX centuries viruses were the agents of serious diseases - tobacco mosaic, foot and mouth disease of cattle, yellow fever man. The discovery of viruses associated with the works of Russian botany E. AND. Ivanovo, which in 1892, described some of the properties of the tobacco mosaic virus, distinguishing it from the bacteria. At the present time pathogenic viruses known to most plants and animals, and if some groups of organisms, they are not found, then this is caused by the most likely insufficient study of this group. For example, the greatest practical importance among the lower organisms are bacteria - pathogens of infectious diseases in man. Parasitic on them viruses (bacteriophages) have been found yet in the first quarter of the XX century. After 30 years in connection with the development of antibiotic industry began to be widely studied актиномицеты. It turned out that almost all of them have specific viruses - актинофаги. The first mushroom, in which the virus was discovered,is cultivated by champignon. After him viruses were found in yeast and пенициллов, i.e. the objects of practically important and therefore a more in detail studied. With the development of the methods of electron microscopy, preparative and analytical biochemistry became possible not only to see the viruses, but also to study their chemical composition and structure. Better than others studied viruses infecting bacteria, the higher plants and animals. Страницы: 1 2 3 4 5 6 7 далее > Lower plants | www.fares-print.com