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Density-dependent transport coefficients in two-dimensional cellular aggregates.

Subhadip Chakraborti1, Vasily Zaburdaev1

  • 1Friedrich-Alexander-Universität Erlangen-Nürnberg, Department of Biology, 91058 Erlangen, Germany and Max Planck Zentrum für Physik und Medizin, 91054 Erlangen, Germany.

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Summary
This summary is machine-generated.

We developed a theory to explain how bacteria like Neisseria gonorrhoeae form colonies. Our findings predict a slowdown in transport during this aggregation process, offering new tools for studying collective cell behavior.

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Area of Science:

  • Physics
  • Biology
  • Biophysics

Background:

  • Large-scale biological systems exhibit collective behavior driven by microscopic interactions.
  • Cellular aggregation, particularly by motile bacteria, is a key example, often involving active contractile forces.

Purpose of the Study:

  • To develop a two-dimensional fluctuating hydrodynamics theory for bacterial aggregation.
  • To derive macroscopic transport coefficients (bulk diffusivity and conductivity) for cellular systems.
  • To analyze the dependence of these coefficients on cell density and microscopic parameters.

Main Methods:

  • Developed a two-dimensional fluctuating hydrodynamics theory.
  • Modeled the aggregation dynamics of Neisseria gonorrhoeae bacteria.
  • Derived bulk diffusivity and conductivity coefficients from microscopic dynamics.

Main Results:

  • Derived two macroscopic transport coefficients: bulk diffusivity and conductivity.
  • Showed how these coefficients are influenced by cell density and microscopic parameters.
  • Predicted a slowdown in transport during bacterial colony formation.

Conclusions:

  • The study provides analytical tools for quantifying hydrodynamic transport in cellular aggregation.
  • Offers insights into the collective behavior of Neisseria gonorrhoeae.
  • Highlights the importance of contractile forces in driving macroscopic transport.