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HISTORY OF MICROBIOLOGY Medical Microbiology Mrs. Bagwell
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SCIENTIFIC REVOLUTION Robert Hooke Englishman, mechanic and tinker C reated first working microscope First to observe dead cells Developed “Cell Theory”
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CELL THEORY The parts to the cell theory are as described below: All living organisms are composed of one or more cells. The cell is the basic unit of structure, function, and organization in all organisms. All cells come from pre-existing, living cells.
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Anton Van Leewenhoek (1673) Dutch merchant Develop a microscope using magnifying lens (300X) First to see live cells- named them “animalcules” Studied pond water, scrapings from mouth, etc.
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SPONTANEOUS GENERATION (ABIOGENESIS) Life forms arose spontaneously from non-living matter. Wildly held belief until the mid-1800’s Challenged by Rudolf Virchow (1858) with concept of BIOGENESIS (cells an only come from other cells)
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Francesco Redi (1668) Did experiments to disprove Spontaneous Generation Ran convincing experiments
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Pasteur (1857) Demonstrated that organisms are in the air Developed germ theory of fermentaion Hired to see why wine spoiled Also, proved that boiling kills organisms (led to pasteurization)
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GOLDEN AGE Germ Theory of Disease Microorganisms might cause disease Led to ASEPSIS techniques Pasteur (pasteurization) Lister (use of carbolic acid to stop disease after surgery) Semmelweis (handwashing before child birth to prevent puerperal fever)
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KOCH’S POSTULATES (1876) The microorganism must be found in abundance in all organisms suffering from the disease, but should not be found in healthy organisms. The microorganism must be isolated from a diseased organism and grown in pure culture. The cultured microorganism should cause disease when introduced into a healthy organism. The microorganism must be re-isolated from the inoculated, diseased experimental host and identified as being identical to the original specific causative agent
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Edward Jenner (1796) Studied smallpox Discovered that milk maids with coxpox did not get small pox Tried experiment on 8 year old boy Developed first vaccine
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SMALLPOX
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SEARCH FOR THE “MAGIC BULLET” First “Chemotherapy” Synthetic drugs Antibiotics
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SYNTHETIC DRUGS Prepared from chemicals in laboratory Paul Ehrlich (1910)- salvarsan Sulfa drugs-sulfonamides
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ANTIBIOTICS Alexander Fleming, Scottish (1928)
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