MMG 301 Lecture Notes - Lecture 16: Mesophile, Hyperthermophile, Thermophile
4 Apr 2017
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Lecture 16: recall what the cardinal temperatures are for bacterial growth. Optimum: temperature at which the species grows the fastest. Maximum: highest temperature for species" growth: recall the names of the groups of microorganisms living in different temperature ranges. Hyperthermophile: 80oc < o. t: explain why certain protective enzymes are found in aerobes and facultative aerobes while other protective enzymes are found in anaerobes. Aerobes produce oxygen which can catalyze a reaction that creates toxic forms of oxygen so the protective enzymes help to protect the bacteria: explain what ph homeostasis is. The internal ph of bacteria cells remains close to neutrality (~7: explain how variations in ph are used to protect food against spoilage. Specific bacteria grow at specific ph levels, so changes in ph in food will allow for bacteria to grow there and spoil food: recall the classes of microbes that grow in environments with low water. Osmophiles: organisms that grow at high solute/sugar concentrations.
