chapter 5

Chapter 5 - Chapter 5 Monday 8:07 PM Chapter 5 Environmental Influences and Control of Microbial Growth Environmental factors that affect microbial

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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.  Minimum temperature - cellular processes slow; cytoplasmic membranes  stiffen  Maximum temperature- proteins start to denature Optimum temperature Microorganisms can be grouped by the temperature ranges they require. Psychrophiles Cold:  O°C–20°C  Mesophiles 20°C–45°C   Thermophiles  40°C–80°C  Extreme thermophiles  65°C–113°C   Psychrophiles -  found in constantly cold environments  Example:  Chlamydomonas-  "snow algae"   Molecular adaptations of psychrophiles:  Membranes have high content of unsaturated fatty acids - semi-fluid at low 
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This note was uploaded on 03/31/2009 for the course BIOL 2051 taught by Professor Brininstool during the Spring '07 term at LSU.

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Chapter 5 - Chapter 5 Monday 8:07 PM Chapter 5 Environmental Influences and Control of Microbial Growth Environmental factors that affect microbial

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