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Real-time rheology of actively growing bacteria

2013-03-12Journal article Open access
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dc.contributor.authorPortela, R.
dc.contributor.authorAlmeida, Pedro L.
dc.contributor.authorPatricio, Pedro
dc.contributor.authorCidade, T.
dc.contributor.authorSobral, R. G.
dc.contributor.authorR. Leal, Catarina
dc.date.accessioned2013-10-26T19:50:07Z
dc.date.available2013-10-26T19:50:07Z
dc.date.issued2013-03-12
dc.description.abstractThe 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.por
dc.identifier.citationPORTELA, 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, N.º 3 (2013).por
dc.identifier.issn1539-3755
dc.identifier.other10.1103/PhysRevE.87.030701
dc.identifier.urihttp://hdl.handle.net/10400.21/2799
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherAmer Physical Socpor
dc.relation.ispartofseries030701
dc.subjectStaphylococcus-aureuspor
dc.subjectPseudomonas-aeruginosapor
dc.subjectAGRpor
dc.subjectDetachmentpor
dc.subjectMechanismspor
dc.subjectExpressionpor
dc.subjectInsightspor
dc.subjectBiofilmspor
dc.subjectDistinctpor
dc.titleReal-time rheology of actively growing bacteriapor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceUSApor
oaire.citation.issue3
oaire.citation.titlePhysical Review Epor
oaire.citation.volume87por
person.familyNameMarques de Almeida
person.familyNamePatricio
person.familyNameMarques Mendes Almeida da Rosa Leal
person.givenNamePedro
person.givenNamePedro
person.givenNameCatarina
person.identifierA-2814-2009
person.identifier.ciencia-id0218-71B2-2DE0
person.identifier.ciencia-idC616-BA77-E9C9
person.identifier.ciencia-idAF15-486E-BB15
person.identifier.orcid0000-0001-7356-8455
person.identifier.orcid0000-0002-9050-9956
person.identifier.orcid0000-0001-5871-4936
person.identifier.ridB-4356-2009
person.identifier.ridA-2750-2009
person.identifier.scopus-author-id57190384213
person.identifier.scopus-author-id7005379280
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication429b6d71-328e-42b3-8151-15493de249b8
relation.isAuthorOfPublication11a2a1d5-8165-475a-8a54-e32bd8e8ce4e
relation.isAuthorOfPublication4db8990d-5eb1-4515-ae7a-68873cf776a5
relation.isAuthorOfPublication.latestForDiscovery4db8990d-5eb1-4515-ae7a-68873cf776a5

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