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Oscillatory behaviour control in a continuous culture under double-substrate limitation.

Piotr Skupin1, Mieczyslaw Metzger1

  • 1a Faculty of Automatic Control, Electronics and Computer Science, Institute of Automatic Control Department , Silesian University of Technology , Gliwice , Poland.

Journal of Biological Dynamics
|July 31, 2018
PubMed
Summary

Researchers explored using two growth-limiting substrates to control self-sustained oscillations in continuous cultures. Adjusting substrate proportions offers a new method to manage oscillatory behavior in bioprocesses.

Keywords:
Fermentation processbifurcation analysislimit cycles

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Area of Science:

  • Biotechnology
  • Biochemical Engineering
  • Process Control

Background:

  • Continuous culture processes can exhibit self-sustained oscillations.
  • Oscillatory behavior can impact process efficiency and product yield.
  • Controlling these oscillations is crucial for stable bioprocess operation.

Purpose of the Study:

  • To investigate the use of a mixture of two growth-limiting substrates to induce or eliminate self-sustained oscillations.
  • To evaluate the proportion of substrates as a novel control variable.
  • To analyze oscillatory behavior under simultaneous consumption and diauxic growth patterns.

Main Methods:

  • Model simulations were employed to study the system dynamics.
  • Bifurcation analysis was used to identify critical parameter values.
  • The impact of substrate mixture proportions on oscillations was examined.

Main Results:

  • The proportion of two growth-limiting substrates can be effectively used as a control variable.
  • Specific substrate proportions can induce or eliminate self-sustained oscillations.
  • Both simultaneous consumption and diauxic growth patterns were analyzed, showing controllability.

Conclusions:

  • Controlling substrate mixture proportions offers a viable strategy for managing oscillations in continuous cultures.
  • This approach provides a new tool for optimizing bioprocess stability and performance.
  • The findings are applicable to various microbial continuous culture systems.