MICRB 265 (09/04/13) - Introduction and History

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Microbiology (Biological Sciences)
Brian Lanoil

MICRB 265 – Lecture Notes (September 4, 2013): Introduction and History Important Contributors to Microbiology: Antonie van Leeuwenhoek  The father of microbiology  Called the microbes that he saw under his microscope (microbes) Lucretius  Believed that disease and illness were caused by invisible living creatures Aristotle  Believed that these “animalcules” appeared spontaneously and this was his explanation for where they came from o Thus, Aristotle led people to believe in the concept of “spontaneous generation” for about 2000 years Francesco Redi  Attempted to disprove spontaneous regeneration by conducting an experiment o He used two samples of meat. He left one piece inside an open jar and the other one in another jar that had the opening covered by cheesecloth. The piece of meat exposed to the open became infested with maggots while the other one, which was shielded by the cheesecloth did not o Did this ultimately disprove spontaneous generation? No, supposedly, the maggots were too big for spontaneous generation to occur to them John Needham  Tried testing out the spontaneous generation theory  Experiment: First, he boiled some broth to kill anything that might be living in it and then sealed it into a jar. o Result: The broth became turbid with microbes  turbid: having sediment or foreign particles suspended or stirred up within. o His conclusion: Spontaneous Generation exists o Validity of his conclu
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