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Viruses can be classified according to the host cell they infect: In it was shown that proteins from an ERV are actively expressed in 3-day-old human embryos and appear to play a role in embryonal development and protect embryos from infection by other viruses. While viruses virology lecture notes pdf download and evolve, they do not engage in metabolismdo not move, and depend on a host cell for reproduction.
MICROBIOLOGY PPT LECTURES
The notion that viruses were particles was not considered unnatural and fitted in nicely with the germ theory. Sputnik reproduces in amoeba infected by mamavirusa relative of the mimivirus mentioned above and the largest known virus to date.
Mendelian genetics and resistance of plants to viruses”. This work aided Jonas Salk in deriving a polio vaccine from deactivated virology lecture notes pdf download viruses; this vaccine was shown to be effective in From Wikipedia, the free encyclopedia. Some subviral particles also cause disease: In the period from togene therapy was tried on several other diseases and with different viral vectors, but it became clear that the initially high expectations birology overstated.
Ivanovsky reported a minuscule infectious agent or toxincapable of passing the filter, may be being produced by a bacterium. Transduction of bacteria by bacteriophages was first described in the same year. virology lecture notes pdf download
Alphaflexiviridae Betaflexiviridae Gammaflexiviridae Tymoviridae. Subsequent tremendous research efforts turned HIV into the best studied virus. It is assumed that Dr.
Retrieved 3 December These discoveries have continued in the 21st century as new viral diseases such as SARS  and nipah virus  have emerged. Many bacteriologists soon discovered the cause of numerous infections. Reassortment Antigenic shift Antigenic drift Phenotype notew. Amoebic dysentery Hookworm Malaria Schistosomiasis.
Virology – Wikipedia
During andWilliam Crawford Gorgas — organised the destruction of the mosquitoes’ breeding habitats in Cuba, which dramatically reduced the prevalence of the disease. An obvious problem to be overcome in viral gene therapy is the rejection of the transforming virus by the immune system.
This page was last edited on 26 Februaryat The Journal of Infectious Virology lecture notes pdf download. Advances in Experimental Medicine and Biology. Virology s notrs science. This indicates that the anti dysentery microbe is an obligate bacteriophage”. The virus was later shown to be a previously unrecognised herpes virus, which is now called Epstein—Barr virus.
History of virology
It was the first virus to be discovered, and the first to be crystallised and its structure shown virology lecture notes pdf download detail. Viral entry Viral replication Viral shedding Virus latency Viroplasm. InFrederick Sanger achieved the first complete sequencing of the genome of any organism, the bacteriophage Phi X Microbial Cell Ultrastructure and Function.
Rosalind Franklin’s research on Tobacco mosaic virus”.
Bacteriophages occasionally move genetic material from one bacterial cell to another in a process known as transduction and this horizontal gene transfer is virology lecture notes pdf download reason why they served as a major research tool in the early development of molecular biology. It was later realized that almost all genes of eukaryotes have introns as well.
The study of virology lecture notes pdf download manner in which viruses cause disease is viral pathogenesis. Retrieved from ” https: The invention of a cell culture system for growing the virus enabled Jonas Salk — to make an effective polio vaccine.
InJohn Kunkel Small — discovered that insects could act as vectors and transmit virus to plants.
This experiment lecrure highly controversial, as the cancer patient subjects were unaware that they were being injected with cancer cells. Together with Delbruck they were jointly awarded virology lecture notes pdf download Nobel Prize in Physiology or Medicine “for their discoveries concerning the replication mechanism and the genetic structure of viruses”.
They contained the foreign gene but did not contain the viral genome and therefore could not reproduce.