BIO SCI M122 Lecture Notes - Lecture 40: Mesophile, Psychrophile, Thermophile
4 Dec 2016
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Two most important requirements for microbial growth: Three physical factors that affect microbial growth and metabolism rate are: Individual bacterial species can exist only within a narrow spectrum of temperatures reflecting the species unique natural habitat. Microorganisms can be classified into 3 main groups based on their preferred range of temperature: Thermal death point (tdp): the temperature it take to kill all microbes at the first. Example of graph depicting tdp between 2 bacteria. Yes, after being exposed to high heat e. coli stopped/ would not grow. (growth at 80 c due to possible contamination). The reason for the growth of b. subtilis after exposure to high heat is due to it being able to make endospores which survived the high heat. Was there a difference in pigmentation production of b. This showed that b. subtilis produced endospores between 40 c - 50 c and is the temperature in which the vegetative state of b. subtilis died.
