BIOL 2051 Chapter : Chapter 5 Notes
Document Summary
Chapter 5 - environmental influences and control of microbial growth. Environmental factors that affect microbial growth: temperature, pressure, osmolarity, ph, oxygen. Extreme thermophiles: 65 c 113 c, psychrophiles- found in constantly cold environments. Found in warm blooded animals & many terrestrial & aquatic environments. Examples- most organisms you are familiar with such as escherichia coli (found in the human intenstine). Some archaea have been found growing at temps above 110 c: places thermophiles are found: soils subjected to full sunlight fermenting materials (compost, hot springs. Thermus aquaticus is a common hot spring thermophile. Emergency proteins produced: help keep proteins from denaturing. Induced by many stressful conditions: heat, high salt concentrations, arid conditions. Pressure: barophiles, adapted to high pressures, up to 1,000 atm, barotolerant organisms, grow at high, but not very high pressure, barosensitive organisms (most organisms) In a _____________ environment water will move _________ a cell & the cell will. In a hypotonic environment water will move into the cell.
