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The Germ Theory. Louis Pasteur finally figures out how diseases are spread. Existing Theories. Miasma & Spontaneous Generation Disease carried by foul air Micro-organisms are the result of the process of decay Pus and gangrene mutates into Germs Flies and Maggots provided evidence

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the germ theory

The Germ Theory

Louis Pasteur finally figures out how diseases are spread

existing theories
Existing Theories
  • Miasma & Spontaneous Generation
    • Disease carried by foul air
    • Micro-organisms are the result of the process of decay
      • Pus and gangrene mutates into Germs
        • Flies and Maggots provided evidence
      • Non-life creates living organisms
micro organisms
Micro-Organisms
  • Leeuwenhoek
    • Dutch clockmaker
    • Built an early powerful microscope
    • Examined everything he could
      • He kept on noticing small living organisms in everything he examined
        • In food, water, excreta, plaque
  • He did not know what function they played
improved microscopes
Improved Microscopes
  • Joseph Lister in the 1830s
    • Improved lens production allowed Joseph Lister to produce microscopes that could magnify 1,000 times
    • Any scientist could buy this microscope
    • Micro-organisms could be studied in more detail
pasteur s germ theory
Pasteur’s Germ Theory
  • Pasteur
    • A Scientist (not a doctor)
  • Brewery in France
    • Asked Pasteur to investigate why some vats of alcohol would go bad
  • His theory
    • Germ = Germination
      • A growing, living organism caused the problem
  • His solution to the problem was to boil the liquid to kill the germs
    • Pasteurisation
      • Applied to milk, beer, wine, vinegar
pasteur battles spontaneous generation theory
Pasteur battles Spontaneous Generation Theory
  • French Academy launches competition to prove or disprove Spontaneous Generation in 1860
  • Pasteur devises experiments to show that microbes existed in the air
  • Copy source 2 page 129
linking germs to disease
Linking Germs to Disease
  • “If wine and beer are changed by germs, then the same can and must happen sometimes in men and animals”
  • French Silk Industry
    • Asked Pasteur to investigate why their silkworms kept dying.
    • He discovered that a certain germ was responsible for
homework task
Homework Task
  • Task page 129
  • Draw a flow chart to show how germs were linked to disease
  • Explain why each step was important
  • What factors helped the scientists at each step.