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The Golden Age of Microbiology (1800s-1900s)
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The Golden Age of Microbiology (1800s-1900s)
1. Does Microbial Life Spontaneously Generate
Living things arose from three processes
Experiment 1 for Spontaneous Generation
1. Asexual Reproduction
2. Sexual Reproduction
3. Nonliving matter proposed spontaneous generation
Redi Experiment (meat and maggots)
4. Living things can arise from nonliving matter (abiogenesis)
Decaying meat kept isolated from flies, maggots never developed
meat exposed to flies was infested
Doubted Aristotle
Experiment 2 of Spontaneous Generation
Needham Experiment
Large animals not spontaneous but microbes are
Boiled Gravy and plant materials then sealed vials , vials became cloudy
Explanation- life forced caused heated matter to come to life
Experiment 3 of Spontaneous Generate
Spallanzani Experiment
Concluded on Needham finding
Needham failed to heat vials enough to kill all microbes (so they contaminate)
Spontaneous does not occur,all living things arise from other living things
sealed vials do not allow enough air for organisms to survive
4 Questions of Life
1. Is spontaneous generation of
microbial life possible?
2.Is spontaneous generation of microbial life possible?
3.What causes disease?
4.How can we prevent infection and disease?
Microbial Life Spontaneously Generate Cntd
Experiment 5
Pasteur Experiment
Perfomed same experiment as Virchow but with Swan necked flasks
Flask were upright and no growth happened
Experiment 4
Rudolf Virchow (pathologist)
Introduced Biogenesis- the synthesis of substances by living organisms.
Living cells can only arise from pre existing living cells