viruses, viriods and prions: discovery of viruses, nomenclature and classification of viruses- ictv system of classification
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viroids:
: Disccovered by T.O. Diener in 1971.
.RNA has low molecular weight.
.Causes potato spindle tuber disease.
.Infections agent, free RNA (lack protein coat)
viruses: pasteur gave the them virus i.e poisonous fluid.
D. J. Ivanowsky (1892 )found out the certain microbes caused tobacco Mosaic Disease in tobacoo plant.
M.W. Beijerinerk (1898 ) demonstared that the extarct of the infected plants of tobacoo could cause infections in healthy plants and called the fluid as Contagium vivum fluidum ( infections living fluid ) .
W.M. Stanely ( 1935) showed that viruses could be crystallised and crystalas consist largely pf proteins . They arecinert outside their specfic host cell. viruses are obligate parasites.
Nomenclature : there is a need to standardise the nameing of living organisms such that particular organism ia know by the same name all over the world . This process is called nomenclarure
: Disccovered by T.O. Diener in 1971.
.RNA has low molecular weight.
.Causes potato spindle tuber disease.
.Infections agent, free RNA (lack protein coat)
viruses: pasteur gave the them virus i.e poisonous fluid.
D. J. Ivanowsky (1892 )found out the certain microbes caused tobacco Mosaic Disease in tobacoo plant.
M.W. Beijerinerk (1898 ) demonstared that the extarct of the infected plants of tobacoo could cause infections in healthy plants and called the fluid as Contagium vivum fluidum ( infections living fluid ) .
W.M. Stanely ( 1935) showed that viruses could be crystallised and crystalas consist largely pf proteins . They arecinert outside their specfic host cell. viruses are obligate parasites.
Nomenclature : there is a need to standardise the nameing of living organisms such that particular organism ia know by the same name all over the world . This process is called nomenclarure
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