Spreading of nonmotile bacteria on a hard agar plate: Comparison between agent-based and stochastic simulations

Navdeep Rana, Pushpita Ghosh, and Prasad Perlekar
Phys. Rev. E 96, 052403 – Published 7 November 2017

Abstract

We study spreading of a nonmotile bacteria colony on a hard agar plate by using agent-based and continuum models. We show that the spreading dynamics depends on the initial nutrient concentration, the motility, and the inherent demographic noise. Population fluctuations are inherent in an agent-based model, whereas for the continuum model we model them by using a stochastic Langevin equation. We show that the intrinsic population fluctuations coupled with nonlinear diffusivity lead to a transition from a diffusion limited aggregation type of morphology to an Eden-like morphology on decreasing the initial nutrient concentration.

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  • Received 23 June 2017

DOI:https://doi.org/10.1103/PhysRevE.96.052403

©2017 American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Statistical Physics & ThermodynamicsPhysics of Living SystemsInterdisciplinary PhysicsNonlinear Dynamics

Authors & Affiliations

Navdeep Rana, Pushpita Ghosh*, and Prasad Perlekar

  • Tata Institute of Fundamental Research, Centre for Interdisciplinary Sciences, Hyderabad 500107, India

  • *pghosh@tifrh.res.in
  • perlekar@tifrh.res.in

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Issue

Vol. 96, Iss. 5 — November 2017

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