Cell theory 2 (pasteur)

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  • Cell theory 2 (pasteur)

    1. 1. Louis Pasteur and the development of cell theory
    2. 2. Background:
    3. 3. Background: • Francesco Redi - meat in covered jars does not produce maggots
    4. 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. 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. 6. Louis Pasteur
    7. 7. • Boiled broth in a swan-necked flask.
    8. 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. 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. 10. Results:
    11. 11. Results: • Broth remained clear, no bacteria found when examined under microscope
    12. 12. Results: • Broth remained clear, no bacteria found when examined under microscope • Dust collected in bend of swan neck
    13. 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. 14. cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
    15. 15. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
    16. 16. Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life
    17. 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. 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. 19. All cells come from pre-existing cells cc licensed flickr photo by Andrew Coulter Enright: http://flickr.com/photos/andrewcoulterenright/ 2146798371/
    20. 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/

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