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  • 1. viruses
    By
    NiaWidyastuti
    1
  • 2. BASIC COMPETENCY
    INDICATOR
    Identify the characteristics of virus
    Distinguish the structure of virus
    Explain the virus life style
    Explain the replication of virus
    Explain the roles of the harmful and the harmless viruses
    Describing the
    characteristics, the
    replication, and the roles
    of virus in life
    2
  • 3. HISTORY OF THE SEARCH FOR VIRUS
    1883, Adolf Mayer (Germany) do research to tobacco plant have mosaic disease can cause tobacco plant become dwarf and leaves have spotted. Conclusion : new kind of bacteria
    1892, Dmitri Iwanowski (Russian) do filter extract tobacco leave with filter so bacteria or other micro organism can’t infection plant tobacco in fact extract tobacco have been filtered but tobacco plant infection mosaic disease. Conclusion : pathogen bacteria
    1893, Martinus W. Beijerink (Dutch) he assumed that there are agent can infection tobacco plant, he called that agent is filterable virus because can out from bacteria filter and can’t to have seen with light microscope
    3
  • 4. CHARACTERISTICS OF VIRUSES
    Viruses are not cell
    Viruses extremely small (0,05-0,2 µm or 50x smaller than bacteria size. To observe viruses need electron microscope
    Contain some materials found in cells, made of a core of nucleic acid surrounded by a protein DNA or RNA
    Can’t do reproduction it self
    Can’t do metabolisms it self
    Can be crystalloid
    4
  • 5. DIFFERENCE OF VIRUS WITH CELL
    Only have one type nucleic acid (RNA or DNA)
    Can’t do reproduction it self
    Don’t have metabolisms it self
    Body cell have two type nucleic acid DNA and RNA
    Can do reproduction
    Have metabolism system
    VIRUS
    CELL
    5
  • 6. STRUCTURE BODY OF VIRUS
    Model of a virus
    Information Picture
    1
    2 3 3
    4
    5
    1. Protein coat
    2. Nucleic acid
    3. Head
    4. Wrapper tail
    5. Tail fiber
    6
  • 7. SHAPE OF VIRUSES
    7
  • 8. REPRODUCTION OF VIRUSES
    LYTIC CYCLE
    LYSHOGENIC CYCLE
    Absorption
    (virus attaches to cell)
    Penetration
    (virus DNA enters cytoplasm cell)
    Replication and synthesis
    (virus directs cell to make new viruses)
    Shape of new virus
    (arrange nucleic acid and protein virus)
    Released
    (cell burst releasing new virus)
    Process lyshogenic cycle
    similar with lytic cycle step
    but in in step replication
    there are step addition or
    insertion genetic material
    virus in bacteria material
    which called profage
    8
  • 9. 9
  • 10. CLASSIFICATION OF VIRUS
    Based on hospes cell (selinang) virus divided into three, they are :
    1. Bacteria Virus (virus which infection bacteria cell)
    2. Animal Virus (virus which infection animal cell)
    3. Plant Virus (virus which infection plant cell)
    10
  • 11. disease in animal caused by virus
    11
  • 12. Herpes
    Tetelo
    12
  • 13. disease in plants caused by virus
    13
  • 14. Tobacco Mosaic virus
    Potato yellow dwarf virus
    14
  • 15. disease in human caused by virus
    15
  • 16. Ebola
    Hepatitis B
    Herpes Oral
    16
  • 17. uses of virus
    Insect Control
    Some viruses cause disease in insects. Scientists are trying to use these viruses to kill insects that damage crops. In time, such viruses may replace insecticides.
    Cell Research
    Scientist study viruses to understands DNA, RNA, and other cell compounds. Such research may add to our knowledge of cell activities.
    Control of Viral Diseases
    Scientists use some virus to produce vaccines. Vaccines are substances that help your body defend against diseases. Several vaccines are made from chemical treated viruses. These vaccines are injected into the body. The body then produces substances that protect against these viruses
    17
  • 18. Thank You for your Attention
    Orang yang cerdasadalah
    orang yang maumemahami, mengerti , danterusbelajar
    GANBATTE
    18