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Temperature Effects on the Growth of Microorganisms

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Temperature effects on the growth of microorganisms

Introduction:

The purpose of this experiment was to determine the effects that temperature has on three different organisms. Temperature is one of the most important environmental factors affecting growth and survival of microorganisms². The three organisms used where Escherichia coli, Pseudomonas fluorescens, and Bacillus stearothermophilis. Most bacteria grow within a particular temperature range. The minimum growth temperature is the lowest temperature at which a bacterium can still grow, while the maximum growth temperature is the highest temperature at which a particular bacterium can still grow. The optimum growth temperature is the temperature at which the bacterium
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Therefore E. coli would be considered a mesophile with the optimal growth temperature around 35° C. A mesophile is an organism living in temperatures ranging from 15° C to 47° C. B. stearothermophilis did not start to grow until 47° C, therefore would be considered a thermophile. A thermophile is an organism that thrives in hot environments. The optimal temperature
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