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  Mechanically Driven Growth of Quasi-Two-Dimensional Microbial Colonies

Farrell, F. D. C., Hallatschek, O., Marenduzzo, D., & Waclaw, B. (2013). Mechanically Driven Growth of Quasi-Two-Dimensional Microbial Colonies. Physical Review Letters, 111: 168101. doi:10.1103/PhysRevLett.111.168101.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0FA9-9 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0FAA-7
Genre: Journal Article

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 Creators:
Farrell, F. D. C., Author
Hallatschek, Oskar1, Author              
Marenduzzo, D., Author
Waclaw, B., Author
Affiliations:
1Max Planck Research Group Biological Physics and Evolutionary Dynamics, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063291              

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 Abstract: We study colonies of nonmotile, rod-shaped bacteria growing on solid substrates. In our model, bacteria interact purely mechanically, by pushing each other away as they grow, and consume a diffusing nutrient. We show that mechanical interactions control the velocity and shape of the advancing front, which leads to features that cannot be captured by established Fisher-Kolmogorov models. In particular, we find that the velocity depends on the elastic modulus of bacteria or their stickiness to the surface. Interestingly, we predict that the radius of an incompressible, strictly two-dimensional colony cannot grow linearly in time, unless it develops branches. Importantly, mechanical interactions can also account for the nonequilibrium transition between circular and branching colonies, often observed in the lab.

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Language(s): eng - English
 Dates: 2013-10-18
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 692256
DOI: 10.1103/PhysRevLett.111.168101
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Title: Physical Review Letters
  Alternative Title : Phys. Rev. Lett.
Source Genre: Journal
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Pages: - Volume / Issue: 111 Sequence Number: 168101 Start / End Page: - Identifier: -