Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2799
Título: Real-time rheology of actively growing bacteria
Autor: Portela, R.
Almeida, Pedro L.
Patrício, Pedro
Cidade, T.
Sobral, R. G.
Leal, Catarina Marques Mendes Almeida da Rosa
Palavras-chave: Staphylococcus-aureus
Data: 12-Mar-2013
Editora: Amer Physical Soc
Citação: PORTELA, R.; ALMEIDA, P. L.; PATRÍCIO, P.; CIDADE, T.; SOBRAL, R. G.; LEAL, C. R. - Real-time rheology of actively growing bacteria. Physical Review E. ISSN 1539-3755. Vol. 87 (2013).
Relatório da Série N.º: 030701
Resumo: The population growth of a Staphylococcus aureus culture, an active colloidal system of spherical cells, was followed by rheological measurements, under steady-state and oscillatory shear flows. We observed a rich viscoelastic behavior as a consequence of the bacteria activity, namely, of their multiplication and density-dependent aggregation properties. In the early stages of growth (lag and exponential phases), the viscosity increases by about a factor of 20, presenting several drops and full recoveries. This allows us to evoke the existence of a percolation phenomenon. Remarkably, as the bacteria reach their late phase of development, in which the population stabilizes, the viscosity returns close to its initial value. Most probably, this is caused by a change in the bacteria physiological activity and in particular, by the decrease of their adhesion properties. The viscous and elastic moduli exhibit power-law behaviors compatible with the "soft glassy materials" model, whose exponents are dependent on the bacteria growth stage. DOI: 10.1103/PhysRevE.87.030701.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2799
ISSN: 1539-3755
Aparece nas colecções:ISEL - Física - Artigos

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