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dc.contributor.authorCerqueira, L.-
dc.contributor.authorOliveira, A.-
dc.contributor.authorNicolau, Ana-
dc.contributor.authorAzevedo, N. F.-
dc.contributor.authorVieira, M. J.-
dc.description.abstractIn this study, single and dual species biofilms of Pseudomonas aeruginosa and Escherichia coli, two common bacteria associated with urinary tract infections, were formed in silicon coupons immersed in artificial urine medium. In single species experiments, E. coli appeared to form biofilms more easily than P. aeruginosa. In mixed biofilms, both species apparently benefited from the presence of the other, as the average Log total cells cm−2 of mixed biofilms (7.29 cells cm−2) was higher than obtained for single cultures (6.99 cells cm−2). However, the use of selective media seemed to indicate that P. aeruginosa was the only microorganism to benefit in mixed biofilms (Log 7 CFU of P. aeruginosa cm−2, compared to Log 6 CFU cm−2 obtained in pure cultures). Peptide nucleic acid-fluorescence in situ hybridization combined with confocal laser scanning microscopy confirmed that E. coli was indeed being outnumbered by P. aeruginosa at 48 h. Whereas E. coli is the main causative agent of catheter-associated urinary tract infections, the results from this study indicate that the reason for the higher prevalence of this microorganism is not related to an enhanced ability to form biofilm and outcompete other species that may also be present, but rather to a better ability to form single-species biofilms possibly due to a more frequent access to the catheter surface.por
dc.description.sponsorshipThe authors would like to acknowledge the financial support provided by the Portuguese Foundation for Science and Technology (PhD grant SFRH/BD/38124/2007 and projects PTDC/EBB-EBI/104263/2008 and PIC/IC/82815/2007).por
dc.publisherTaylor & Francispor
dc.subjectPseudomonas aeruginosapor
dc.subjectEscherichia colipor
dc.subjectPolymicrobial biofilmspor
dc.subjectUrinary catheterspor
dc.titleBiofilm formation with mixed cultures of Pseudomonas aeruginosa/Escherichia coli on silicone using artificial urine to mimic urinary catheterspor
oaire.citationTitleBiofouling : the journal of bioadhesion and biofilm researchpor
dc.publisher.uriTaylor & Francispor
dc.subject.wosScience & Technologypor
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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