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United States (202,448)
BIOL 2051 (13)
A L L (13)
Chapter 5

Chapter 5 (Got A+ on the test)
Chapter 5 (Got A+ on the test)

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School
Louisiana State University
Department
Biological Sciences
Course
BIOL 2051
Professor
A L L
Semester
Winter

Description
Chapter 5Environmental Influences and Control of Microbial Growth Environmental factors that affect microbial growthTemperaturePressureOsmolarity pHOxygenTemperatureTemperature is a major environmental factor controlling microbial growthCardinal temperatures minimum optimummaximum temps for an organismMinimum temperaturecellular processes slow cytoplasmic membranes stiffenMembrane gelling transport process so slow that growth cannot occurMaximum temperature proteins start to denatureCollapse of CM lysisOptimum temperature organism grows best between minmaxEnzymatic reactions occurring at maximal poss rateMicroorganisms can be grouped by the temperature ranges they requirePsychrophilesCold OC20C Mesophiles20C45CThermophiles40C80CExtreme thermophileshyperthermophiles65C113Cstrain 121 grows best at 121CPsychrophiles found in constantly cold environmentsExampleChlamydomonas snow algaeMolecular adaptations of psychrophilesMembranes have high content of unsaturated fatty acidssemifluid at low temperatures
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