MICR 2123 Lecture Notes - Lecture 4: Iodine, Radiography, Q Fever
8 Oct 2016
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Chapter 5: environmental influences and control of microbial growth. Normal or non-extreme growth conditions for microorganisms are: sea-level, temperature 20-40c, neutral ph, 0. 9% salt, ample nutrients. Any ecological niche outside this window is called extreme, and organisms inhabiting them are called extremophiles. Being able to survive and thrive in an environment (extreme or non-extreme) depends on the tolerance of that organism"s proteins and other macromolecular structures to the physical conditions within that environment. Barophile (growth at high pressure, greater than 380 atm) Microanaerobe (growth only in small amounts of oxygen) Each organism has an optimum temperature, as well as minimum and maximum temperatures that define its growth limits. Microorganisms can be classified by their growth temperature: psychrophiles- 0-20c, mesophiles- 15-45c, thermophiles- 40-80c, hyperthermophiles- 65-121c. All of these organisms have membranes and proteins best suited for their temperatures. Barophiles are organisms adapted to grow at very high pressures: up to 1,000 atm (101 mpa)
