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Related Experiment Videos

Microbial Competition in Reactors with Wall Attachment.

M.M. Ballyk1, D.A. Jones, H.L. Smith

  • 1Department of Mathematics, Arizona State University, Tempe, AZ 85287-1804, USA.

Microbial Ecology
|June 8, 2001
PubMed
Summary

This study models bacterial competition in the gut using a plug flow reactor (PFR). Results show invading bacteria are eliminated, even with identical resources, and three strains can segregate into distinct segments.

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Area of Science:

  • Microbiology
  • Mathematical Biology
  • Gastroenterology

Background:

  • Gut microbiota stability is influenced by nutrient competition and bacterial adhesion.
  • Previous models used continuous-stirred tank reactors (CSTRs) to simulate these interactions.
  • This study introduces a plug flow reactor (PFR) model for a more realistic simulation.

Purpose of the Study:

  • To investigate bacterial competition for nutrients and adhesion sites in the gut.
  • To compare PFR model performance with existing CSTR models.
  • To explore the dynamics of multi-strain bacterial colonization in the large intestine.

Main Methods:

  • Developed and numerically investigated a two-strain plug flow reactor (PFR) model.
  • Parameterized the PFR model using data from the mouse and human large intestines.

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  • Simulated scenarios with competing bacterial strains for nutrients and adhesion sites.

    • Main Results:

    • The PFR model demonstrated that invading bacterial strains are largely eliminated, even with identical uptake rates and wall affinities.
    • Simulations showed qualitative and quantitative similarities to CSTR models.
    • In three-strain competition, a steady-state solution emerged with segregated bacterial populations along the reactor wall.

    Conclusions:

    • The PFR model effectively simulates gut microbial dynamics and competition.
    • Bacterial invasion and colonization stability are robustly maintained in the modeled gut environment.
    • Spatial segregation is a viable strategy for coexistence in multi-strain gut microbial communities.