Cell theory 2 (pasteur)
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Cell theory 2 (pasteur)

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Cell theory 2 (pasteur) Cell theory 2 (pasteur) Presentation Transcript

  • Louis Pasteur and the development of cell theory
  • Background:
  • Background: • Francesco Redi - meat in covered jars does not produce maggots View slide
  • 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 View slide
  • 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?
  • Louis Pasteur
  • • Boiled broth in a swan-necked flask.
  • • Boiled broth in a swan-necked flask. • Dust from outside air could not get in because of the long, bent neck of the flask.
  • • 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
  • Results:
  • Results: • Broth remained clear, no bacteria found when examined under microscope
  • Results: • Broth remained clear, no bacteria found when examined under microscope • Dust collected in bend of swan neck
  • 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
  • cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
  • Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/
  • Cell Theory cc licensed flickr photo by msitua: http://flickr.com/photos/ msitua/3246137819/ • Cells are the basic unit of life
  • 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
  • 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
  • All cells come from pre-existing cells cc licensed flickr photo by Andrew Coulter Enright: http://flickr.com/photos/andrewcoulterenright/ 2146798371/
  • 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/