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Microbial growth
refers to an increase in the number of cells - not the size of the cells
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colony
- -group of cells large enough to be seen without a microscope
- -a colony arises from 1 bacterium
- -one E. Coli bacterium divided every 20 minutes
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population
# of cells in 1 colony - millions/ billions
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clone
- a population of identical cells
- - a colony is a clone
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Physical requirements for growth
- Microbes (individual species) have preferred ranges of each
- 1. Temperature
- 2. pH
- 3. Osmotic Pressure
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Chemical requirements for growth
- a. C,H,O,N,P,S
- b. O2c. Trace elements/ vitamins/ growth factors
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Temperature requirements
most bacteria grow within a limited range
Minimum growth temp - minimum temp where there's any growth
optimum growth temp - temp at which there is most growth
maximum growth temp - max temp where there is any growth
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