RT Journal Article
T1 Nonuniversality of front fluctuations for compact colonies of nonmotile bacteria
A1 Santalla, Silvia N.
A1 Rodríguez Laguna, Javier
A1 Abad, Jose P.
A1 Marin, Irma
A1 Espinosa, María del Mar
A1 Muñoz-García, Javier
A1 Vázquez, Luis
A1 Cuerno, Rodolfo
AB The front of a compact bacterial colony growing on a Petri dish is a paradigmatic instance of non-equilibrium fluctuations 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.
PB American Physical Society
SN 1539-3755
YR 2018
FD 2018-07-10
LK https://hdl.handle.net/10016/28356
UL https://hdl.handle.net/10016/28356
LA eng
NO This work has been supported by Ministerio de Economía y Competitividad, Agencia Estatal deInvestigación, and Fondo Europeo de Desarrollo Regional(Spain and European Union) through Grants No. FIS2015-66020-C2-1-P, FIS2015-69167-C2-1-P, FIS2015-73337-JIN,and BIO2016-79618-R, and by Comunidad Autónoma deMadrid (Spain) Grant No. NANOAVANSENS S2013/MIT3029
DS e-Archivo
RD 27 jul. 2024