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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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Branching instability in expanding bacterial colonies.

Chiara Giverso1, Marco Verani2, Pasquale Ciarletta3

  • 1MOX, Politecnico di Milano, P.za Leonardo da Vinci, 32, 20133 Milan, Italy Fondazione CEN, P.za Leonardo da Vinci, 32, 20133 Milan, Italy.

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Bacterial colony patterns emerge from cell growth and motion. This study models colony spreading, revealing that nutrient diffusion versus cell movement dictates whether colonies form compact or branched shapes, aiding controlled pattern design.

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bacterial colony growthbranching instabilitypattern formation

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Area of Science:

  • Mathematical Biology
  • Biophysics
  • Microbiology

Background:

  • Self-organization in developing organisms involves cell duplication and collective motion.
  • Chemical and mechanical interactions coordinate cellular behavior and system dynamics.

Purpose of the Study:

  • To analyze pattern formation in spreading bacterial colonies using mathematical modeling.
  • To investigate the interplay of growth, chemotaxis, nutrient diffusion, and geometry.

Main Methods:

  • Analytical and computational analysis of a continuous mathematical model.
  • Finite-element numerical simulations to study pattern formation.
  • Investigated the role of four dimensionless parameters governing colony dynamics.

Main Results:

  • Spreading bacterial colonies are linearly unstable to interface perturbations.
  • Branching instability arises in simulations, forming radial fingers.
  • Nutrient diffusion dominance over chemotaxis favors branching.
  • Model predicts compact patterns for fast-expanding colonies and branched for slow ones.

Conclusions:

  • The model accurately predicts experimental bacterial colony morphologies.
  • Understanding pattern selection mechanisms provides insights into bacterial self-organization.
  • Results have potential applications in designing controlled biological patterns.