Meaning virus generally refers pd particles that infect multiple cell eukaryotes ( multicellular organisms as well as many types of single cell organisms ) , momentary sense of bacteriophage or phage type used for several types of cells that attack prokaryotes ( bacteria and other organisms that do not nucleated cells ) .
Viruses often debated its status as living things in because he could not move with the biological benefits when there is no free way within the host cell . In because of the distinctive characteristics of this virus is always associated with specific diseases , both human pd ( eg, influenza virus and HIV ) , animals ( eg bird flu virus ) , or plants ( eg, tobacco mosaic virus / TMV ) .
Virus Discovery History
1 . A. Meyer ( Germany , 1882)
He's getting yellow spots pd tobacco leaf shaped contagious . The proof time tobacco leaf extract is injected then another co- infected plants .
2 . D. Ivanosky ( Russia , 1893)
The study of Adolf Mayer repeated by Ivanowsky , extracts of infected tobacco leaves yellow spot disease was filtered with a filter bacteria and then injected into healthy tobacco tobacco but ultimately it remains under attack . Then he bersumsi his form that triggers the disease is smaller than bacteria .
3 . M. Beijerink ( Netherlands , 1897)
Concluded that disease ( pathogens ) can only thrive someone living creatures , and not die by alcohol .
4 . Wendel Stanley ( USA , 1935 )
Getting that despite the already crystallized pathogens can still cause disease ,
Stanley then give the name of the pathogen
File : TobaccoMosaicVirus.jpg
Viral bhs word comes from the Latin meaning poison or kill shaped .
Special Features Virus
Has a smaller size than bacteria ( 2-20 microns )
Only Breed someone living cells
Not having protoplsma
Only can see with the aid of an electron microscope
could be crystallized
Nucleic acids are composed of ADN and ARN
Countless plants , animals and bacteria
Viruses can not synthesize proteins in because does not have ribosomes
classification of Viruses
1 . According to its host :
• Virusa bacteria ( bacteriophages )
• Virus animal genetic material ADN and ARN
• Viruses plant genetic meteri ARN
2 . According to the genetic material :
• Virus DNA parable : adenovirus , herpes virus , papilloma virus , smallpox virus , hepatitis B virus , and others.
• Virus RNA parable : polio virus , hepatitis C , hepatitis A , swine flu virus , bird flu , and others.
Virus propagation Namely there are two steps :
1 . Lytic life cycle consists of phases : Adsorption , penetration , synthesis , assembly , and Lysis
2 . Lysogenic life cycle ( bacteriophage ) consists of phases : Adsorption , Penetration
Functions in Virus In Human Life
1 . Meguntungkan :
• Directly within genetic engineering .
• Indirectly example of this is the control of bacteriophage populations of E. coli in the stomach
2 . adverse : (see also: pakan burung manyar)
1 . The cause of various diseases .
2 . Killing livestock and crops .
3 . Pd cancer cells resulted in vertebrates metaphor RSV ( Rous Sarcoma Virus ) triggers cancer pd cock