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Rotational and translational motion observed in Escherichia coli aggregates during shear

2017-09Conference object Restricted access
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dc.contributor.authorPortela, R.
dc.contributor.authorFranco, J. M.
dc.contributor.authorPatricio, Pedro
dc.contributor.authorAlmeida, Pedro L.
dc.contributor.authorSobral, R. G.
dc.contributor.authorLeal, Catarina R.
dc.date.accessioned2020-11-13T11:04:55Z
dc.date.available2020-11-13T11:04:55Z
dc.date.issued2017-09
dc.description.abstractRecently, the growth of an Escherichia coli culture was studied using real-time and in situ rheology and rheoimaging measurements, allowing to characterize their rheological behavior during time [1]. In the lag phase, bacteria are adapting to the new environmental growth conditions, with a characteristic slow division rate. Accordingly, the viscosity shows a slow and constant increase with time. In the exponential phase the viscosity presents a dramatic increase, but exhibits several drops and recoveries. In the late phase of growth, the viscosity increase slows down, reaching na intermittent plateau of maximum viscosity, with several drops and recoveries. In this phase, the highest bactéria density is attained: bacteria still grow and divide, but at a lower rate; big and irregular bacteria aggregates are observed, which keep moving in suspension and no significant sedimentation is observed; the aggregates present translational motion in the shear flow direction and rotational motion in the vorticity direction; the aggregates become larger along time, due to the incorporation of smaller aggregates; due to the rotational motion, the aggregates become elongated along the rotational axis; apparently, the size of the aggregates does not influence the rotational motion, since almost all aggregates rotate with the same angular velocity, which is related to the applied shear rate. As a first approximation, and because an explicit individual motion of the cells within each aggregate is not observed, this behavior is interpreted in light of a simple rigid-body motion, in which shear rate and angular velocity are dependent, which will be presented as a microscopic model.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationPORTELA, R.; [et al] – Rotational and translational motion observed in Escherichia coli aggregates during shear. In 6th Iberian Meeting on Rheology (IBEREO 2017). Valencia, Spain. Pp. 1-3pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.21/12375
dc.language.isoengpt_PT
dc.relationPTDC/FIS-NAN/0117/2014 (P.L.A.) - FCTpt_PT
dc.relationPOCI-01-0145-FEDER-007728pt_PT
dc.subjectRotationalpt_PT
dc.subjectTranslational motionpt_PT
dc.subjectEscherichia colipt_PT
dc.subjectViscositypt_PT
dc.titleRotational and translational motion observed in Escherichia coli aggregates during shearpt_PT
dc.typeconference object
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FCTM%2F50025%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMulti%2F04378%2F2013/PT
oaire.citation.conferencePlaceSeptember 6-8, 2017 - Valencia, Spainpt_PT
oaire.citation.endPage3pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.title6th Iberian Meeting on Rheology (IBEREO 2017)pt_PT
oaire.fundingStream5876
oaire.fundingStream5876
person.familyNamePatricio
person.familyNameMarques de Almeida
person.familyNameMarques Mendes Almeida da Rosa Leal
person.givenNamePedro
person.givenNamePedro
person.givenNameCatarina
person.identifierA-2814-2009
person.identifier.ciencia-idC616-BA77-E9C9
person.identifier.ciencia-id0218-71B2-2DE0
person.identifier.ciencia-idAF15-486E-BB15
person.identifier.orcid0000-0002-9050-9956
person.identifier.orcid0000-0001-7356-8455
person.identifier.orcid0000-0001-5871-4936
person.identifier.ridA-2750-2009
person.identifier.ridB-4356-2009
person.identifier.scopus-author-id57190384213
person.identifier.scopus-author-id7005379280
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsclosedAccesspt_PT
rcaap.typeconferenceObjectpt_PT
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