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. Author manuscript; available in PMC: 2015 Dec 1.
Published in final edited form as: Genomics. 2014 Oct 2;104(6 0 0):399–405. doi: 10.1016/j.ygeno.2014.09.015

Figure 1.

Figure 1

Continuous versus discontinuous modes of selection used in microbial experimental evolution. A. Serially diluted cultures experience variations in nutrient level and cell density over each growth cycle, including turbidostat-like and chemostat-like phases. B. Chemostat cultures grow at a set dilution rate and experience constant nutrient limitation akin to that seen in batch cultures just before nutrient exhaustion. C. Turbidostats can grow cultures at their maximal growth rate by tuning dilution rate based on culture density, generating constant population size and selection pressure.