Nonuniversality of front fluctuations for compact colonies of nonmotile bacteria
Entidad
UAM. Departamento de Biología MolecularEditor
American Physical SocietyFecha de edición
2018-07-10Cita
10.1103/PhysRevE.98.012407
Physical Review B, 98.1 (2018): 012407
ISSN
2470-0045 (Print); 2470-0053 (Electronic)DOI
10.1103/PhysRevE.98.012407Proyecto
Gobierno de España. FIS201566020-C2-1-P; Gobierno de España. FIS2015-73337-JIN; Gobierno de España. BIO2016-79618-R; Comunidad de Madrid. NANOAVANSENS S2013/MIT3029Materias
Bacillus subtilis; Computer Simulation; Diffusion; Escherichia coli; Models, Biological; Biología y Biomedicina / BiologíaDerechos
©2018 American Physical SocietyResumen
The front of a compact bacterial colony growing on a Petri dish is a paradigmatic instance of non-equilibrium f luctuations in the celebrated Eden, or Kardar-Parisi-Zhang (KPZ), universality class. While in many experiments the scaling exponents crucially differ from the expected KPZ values, the source of this disagreement has remained poorly understood. We have performed growth experiments with B. subtilis 168 and E. coli ATCC 25922 under conditions leading to compact colonies in the classically alleged Eden regime, where individual motility is suppressed. Non-KPZ scaling is indeed observed for all accessible times, KPZ asymptotics being ruled out for our experiments due to the monotonic increase of front branching with time. Simulations of an effective model suggest the occurrence of transient nonuniversal scaling due to diffusive morphological instabilities, agreeing with expectations from detailed models of the relevant biological reaction-diffusion processes
Lista de ficheros
Google Scholar:Santalla, Silvia N.
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Rodríguez Laguna, Javier
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Abad Lorenzo, José Pascual
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Marín Palma, María Dolores Irma
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Espinosa, María Del Mar
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Muñoz-García, Javier
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Vazquez, Luís
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Cuerno, Rodolfo
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