MCB 2610 Chapter Notes - Chapter 6A: Natural Selection, Limiting Factor, Endospore
8 Sep 2016
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Stationary phase & starvation response: entry into stationary phase due to starvation and other stressful conditions activates survival strategy. Rpos protein assists rna polymerase in transcribing genes for starvation proteins. Production of starvation proteins makes cells harder to kill. Prolonged decline in growth: bacterial population continually evolves, process marked by successive waves of genetically distinct variants, natural selection occurs. The continuous culture of microorganisms: growth in an open system. Continual removal of wastes: maintains cells in log phase at constant biomass concentration for extended periods. Microbial population: achieved using a continuous culture system, importance of continuous culture methods. Constant supply of cells in exponential phase growing at a known rate. Study of microbial growth at very low nutrient concentrations, close to those present in natural environment. Study of interactions of microbes under conditions resembling those in aquatic environments. Microbes in nature don"t exist in a closed system.
