Micro 60

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Micro 60
2010-08-18 11:13:48
Microbiology SRJC

Microbiology study cards
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  1. What is Microbiology?
    • It is the study of microorganisms.
    • Organisms too small to be seen by the naked eye.
    • They have a diameter of 1 mm or less.
  2. Domain
    • Archea and Bacteria are prokaryotes and they contain no nucleus.
    • Eukaryotes include protists, fungi and animals.
    • Viruses are non living so they are not put into any category. Viruses are said to be hijackers because they steal from their hosts.
  3. Viruses
    • Viruses are wrapped in a protein coat.
    • Enveloped viruses have lipid bilayers and have glyco proteins for binding.
    • A naked virus has no coat.
  4. Ecological Roles of Microorganisms
    • Pathogens
    • Primary Producers
    • Decomposers
    • Nutrient cycling
    • Symbionts (live with other organisms)
  5. Cycling of Microorganisms
    • Base of food chains-produce oxygen
    • Decompose waste-cycle nutrients
    • Fix Nitrogen
    • Cause disease

    The body is about 10% bacteria
  6. Economical Roles of Microorganisms
    • Chemical synthesis
    • Fermentation
    • Proteins (insulin)
    • Research, medicine, bioremediation, baking and brewing are some examples
  7. History of Microbiology
    • Robert Hooke (1665) invented simple microscope. Observed cork and the "little boxes"
    • Van Leuwenhoek (1673) Discovered early embryos of plants
    • Francesco Redi (1970?) Observation meat left uncovered and maggots. First controlled experiment
    • Spallanzani (1740) all cells come from cells. Broth experiment. Deprived of oxygen so no life can grow.
  8. Biogenesis vs. Spontaneous Generation
    • Belief that life arises from non life
    • Taken as docturine until 1665.
  9. Spontaneous generation put to rest
    • By Louis Pasteur
    • If air is allowed to enter the broth, it has to be clean air. Experiment with swan neck. This was the beginning of Microbiology.