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An auxostat is a continuous culture device which, while in operation, uses feedback from a measurement taken on the growth chamber to control the media flow rate, maintaining the measurement at a constant. Auxo was the Greek goddess of spring growth, and as a prefix represents nutrients. However, the most typical auxostats are pH-auxostats [1], with feedback between the growth rate and a pH meter.

Other auxostats may measure oxygen tension, ethanol concentrations, and sugar concentrations [2]


  1. Larsson G, Enfors S O, (1990). "The pH-auxostat as a tool for studying microbial dynamics in continuous fermentation". Biotechnology and Bioengineering. 36 (3): 224–232.>
  2. Gostomski P, Muhlemann M, Lin YH, Mormino R, Bungay H (1994). "Auxostats for continuous culture research". Journal of Biotechnology. 37 (2): 167–177.

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