BIOL 2051 Chapter : Ch 5 Outline
Document Summary
Chapter 5 - environmental in uences and control of microbial growth. Environmental factors that affect microbial growth: temperature, pressure, osmolarity, ph, oxygen. Pressure: barophiles, adapted to high pressures, up to 1,000 atm, barotolerant organisms, grow at high, but not very high pressure, barosensitive organisms, die at high pressure, most typical bacteria, all mammals. Making or concentrating an organic solute (glycerol) in the cell. (compatibles: osmophile- organism that grows in high solute concentrations (hypertonic environments)(dont know which solute, halophiles-grow best in ocean; % salt in ocean. 3: extreme halophiles require high levels (15% to 30%) of salts for growth. Halobacterium salinarium (requires 25% salt) lives in very salty lakes(produces pink pigment: halotolerant- can survive at higher salt concentrations but grow best in absence of salt. Sulfolobus is a thermophilic and acidophilic (double extreme halophyle: alkaliphiles- grow best at high ph, found in soda lakes & high carbonate soil, many species of bacillus live in very alkaline soils.
