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Cell theory 2 (pasteur)
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  • 1. Louis Pasteur and the development of cell theory
  • 2. Background:
  • 3. Background: • Francesco Redi - meat in covered jars does not produce maggots
  • 4. Background: • Francesco Redi - meat in covered jars does not produce maggots • John Needham, Lazzaro Spallanzani - extensively boiled broth put in sealed, sterilized container does not turn cloudy
  • 5. Background: • Francesco Redi - meat in covered jars does not produce maggots • John Needham, Lazzaro Spallanzani - extensively boiled broth put in sealed, sterilized container does not turn cloudy But what if airflow is needed for spontaneous generation to occur?
  • 6. Louis Pasteur
  • 7. • Boiled broth in a swan-necked flask.
  • 8. • Boiled broth in a swan-necked flask. • Dust from outside air could not get in because of the long, bent neck of the flask.
  • 9. • Boiled broth in a swan-necked flask. • Dust from outside air could not get in because of the long, bent neck of the flask. • Left for a few days
  • 10. Results:
  • 11. Results: • Broth remained clear, no bacteria found when examined under microscope
  • 12. Results: • Broth remained clear, no bacteria found when examined under microscope • Dust collected in bend of swan neck
  • 13. Results: • Broth remained clear, no bacteria found when examined under microscope • Dust collected in bend of swan neck • If flask was broken or tipped so the broth touched the dust, the broth would go cloudy after a couple of days
  • 14. cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
  • 15. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
  • 16. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life
  • 17. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life • All cells come from pre-existing cells
  • 18. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life • All cells come from pre-existing cells • All living things are made of cells and cell products
  • 19. All cells come from pre-existing cells cc licensed flickr photo by Andrew Coulter Enright: http://flickr.com/photos/andrewcoulterenright/ 2146798371/
  • 20. All cells come from pre-existing cells So where did the first cell come from? cc licensed flickr photo by Andrew Coulter Enright: http://flickr.com/photos/andrewcoulterenright/ 2146798371/