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Spontaneous generation

Spontaneous generation. Proving and disproving The Origin of Life. 350 BC Aristotle Greek. He was a philosopher. He can about his ideas by thinking not experimenting. Life arose from non living matter by spontaneous generation. 1600 AD Van Helmot German.

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Spontaneous generation

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  1. Spontaneous generation Proving and disproving The Origin of Life

  2. 350 BC Aristotle Greek He was a philosopher. He can about his ideas by thinking not experimenting. Life arose from non living matter by spontaneous generation

  3. 1600 AD Van Helmot German • Published the recipe for the spontaneous generation of mice. • Place old rags in the corner of your attic. • Sprinkle it with bread crumbs and seeds • Voila (Hier) baby mice

  4. 1665 Robert Hooke English • Coined the word “Cells” by looking at a cork through a microscope. • He thought they looked like the little rooms or Cells that monks lived in.

  5. 1668 Francesco Redi Italian Casts doubt on spontaneous generation by discovering the life cycle of the fly. They didn’t know that maggots were Fly larvae.

  6. 1675 Anton van Leeuwenhoek Dutch Discovers microorganisms “animacules” With the first microscope. Draws bacteria.

  7. 1748 John Needham Scottish Supports spontaneous generation of organisms Boiled broth 1 min. Sealed with loose cork Bacteria still grew Therefore Spontaneous generation must be true

  8. 1776 LazaroSpallanzani Italian Rejects Needham’s experiment. He said it was a bad procedure. He redid the experiment. Boiled the broth for 20 min. Sealed flasks with glass tightly No micro organisms appeared. Therefore Spontaneous generation does not occur.

  9. 1820 IgnazSemmelweis Austrian Discovered that washing hands in hospital Prevents infections and Saves lives. People didn’t believe him

  10. The Cell Theory • The next 4 scientists each made discoveries about cells. • Together they create what we now call the cell theory.

  11. 1835 FélixDujardin French Microorganisms are, in fact, Cells

  12. 1838 Schleiden & Schwan German 1.Matthias Schleiden discovered All Animals are made of Cells 2.Theodor Schwann discovered All Plants are made of cells

  13. 1858 Rudolf Virchow German All cells come from other cells

  14. 1861 Louis Pasteur French • Rejects spontaneous generation , Once and for all. • Discovers that microorganisms cause disease.

  15. Pasteur’s experiment Boil broth for 20 min. Make a swan neck tube. If bacterial growth comes from dust in the air, then the dust will get trapped in the s bend and contamination will not occur. If bacterial growth is spontaneous but need a “factor” from the air circulating, then contanination will occur. 5. 150 years later there is still no contamination. Spontaneous generation does not exist 6. When the tube broke or the liquid touched the neck, Then the broth became contaminated immediately.

  16. 1862 Sad News • Semmelweis dies of an infection

  17. 1870 Thomas Henry Huxley English Theory of “Biogenesis” All life comes from life Can any of you see a problem with this theory? What question comes to mind?

  18. 1928 Alexander Flemming English Mold inhibits bacterial growth Penicillin stops diseases. And the discoveries continue......

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