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Viruses are obligate intracellular parasites myloweslife.com and 20-200 nm in size, shape and chemical composition varies, but only containing RNA or DNA. The particle as a whole is called "virions" consisting of "capsid" that can be wrapped by a myloweslife.com  Glycoprotein / membrane lipids. Viruses resistant to antibiotics Viruses are obligate parasites that are particles in the cell / acellular living beings (not a cell) Measuring microscopic In the host cell the virus shows characteristics of living things, while outside the cells show characteristics of not being hidup.Bentuk virus is different there the bullae, rods, polihidris and like the letter T.
Research on the virus begins with a study of mosaic disease which inhibits the growth of tobacco plant and make the plant leaves have spots. In 1883, Adolf Mayer, a German scientist, discovered that the disease can be transmitted when the plant shows that it became ill after being sprayed with the sap of the plant. Unable to find microbes in the plant sap, Mayer concluded that the disease is caused by bacteria that are smaller than normal and can not be seen with mikroskop.Pada 1892, Dimitri Ivanowsky of Russia discovered that the sap of the leaf tobacco that is filtered by the filter bacteria still can cause mosaic disease. Ivanowsky then concluded two possibilities, namely that the disease-causing bacteria in the form of very small so that they can pass through the filter, or the bacteria release toxins that can pass through the sieve. The second possibility is discharged in 1897 after Martinus Beijerinck from the Netherlands found that the infectious agent in the filtered sap can reproduce because of its ability to cause disease is not reduced after several times transferred antartanaman.Patogen tobacco mosaic concluded as not bacteria, but rather a vivum contagium fluidum , which is a kind of liquid carrier penyakit.Setelah life that, in 1898, Loeffler and Frosch reported that the cause of foot and mouth disease of cattle can pass through a filter that can not be bypassed bacteria. However, they concluded that the pathogen is a bacterium that is very kecil.Pendapat new Beijerinck proved in 1935, after Wendell Meredith Stanley of the United States succeeded in crystallizing particles cause mosaic disease now known as tembakau.Virus mosaic virus is a virus that is also the first time visualized by electron microscopy in 1939 by the German scientist GA Kausche, E. Pfankuch, and H. Ruska.

Virus is a subcellular organisms which because of its size is very small, can only be seen with an electron microscope. Smaller in size than bacteria so that the virus can not be filtered by the filter bacteria. Virus smallest diameter of only 20 nm (smaller than the ribosomes), while the largest virus even difficult to see with a light microscope.

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