chapter 5 - Chapter 5 Monday 8:07 PM Chapter 5...

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Chapter 5 Monday, January 26, 2009 8:07 PM Chapter 5 - Environmental Influences and Control of Microbial Growth    Environmental factors that affect microbial growth Temperature Pressure Osmolarity (salt or sugar concentrations) pH Oxygen   Temperature Temperature is a major environmental factor controlling microbial growth.  Cardinal temperatures- minimum, optimum, & maximum temps for an organism  Minimum temperature - cellular processes slow; cytoplasmic membranes  stiffen  Maximum temperature- proteins start to denature Optimum temperature organism grows best; between min & max Microorganisms can be grouped by the temperature ranges they require. Psychrophiles Cold:  O ° C–20 ° Mesophiles 20 ° C–45 °  Thermophiles  40 ° C–80 ° Extreme thermophiles  65 ° C–113 ° C   Psychrophiles -  found in constantly cold environments  Example:  Chlamydomonas-  "snow algae"   Molecular adaptations of psychrophiles: 
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