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Systematic variation of selection intensity and population size in a chemostat. (a) Steady-state nutrient concentration increases with increasing dilution rates. (b) Population size (red) in the chemostat can be controlled by varying the concentration of the limiting nutrient in the feed media (R) and maintaining a constant dilution rate. In this case, the steady-state concentration of the limiting nutrient in the chemostat (blue) remains constant.
