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Effect of ultrafine-grained titanium surfaces on adhesion of bacteria
journal contribution
posted on 2009-07-01, 00:00 authored by V K Truong, S Rundell, Rimma LapovokRimma Lapovok, Y Estrin, J Y Wang, C C Berndt, D G Barnes, C J Fluke, R J Crawford, E P IvanovaThe influence of the ultrafine crystallinity of commercial purity grade 2 (as-received) titanium and titanium modified by equal channel angular pressing (modified titanium) on bacterial attachment was studied. A topographic profile analysis of the surface of the modified titanium revealed a complex morphology of the surface. Its prominent micro- and nano-scale features were 100-200-nm-scale undulations with 10-15 microm spacing. The undulating surfaces were nano-smooth, with height variations not exceeding 5-10 nm. These surface topography characteristics were distinctly different from those of the as-received samples, where broad valleys (up to 40-60 microm) were detected, whose inner surfaces exhibited asperities approximately 100 nm in height spaced at 1-2 microm. It was found that each of the three bacteria strains used in this study as adsorbates, viz. Staphylococcus aureus CIP 68.5, Pseudomonas aeruginosa ATCC 9025 and Escherichia coli K12, responded differently to the two types of titanium surfaces. Extreme grain refinement by ECAP resulted in substantially increased numbers of cells attached to the surface compared to as-received titanium. This enhanced degree of attachment was accompanied with an increased level of extracellular polymeric substances (EPS) production by the bacteria.
History
Journal
Applied microbiology and biotechnologyVolume
83Issue
5Pagination
925 - 937Publisher
SpringerLocation
Berlin, GermanyPublisher DOI
eISSN
1432-0614Language
engPublication classification
C Journal article; C1.1 Refereed article in a scholarly journalCopyright notice
2009, Springer-VerlagUsage metrics
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No categories selectedKeywords
titanium surfacesequal channel angular pressing (ECAP)bacterial adhesionstaphylococcus aureuspseudomonas aeruginosaescherichia coliScience & TechnologyLife Sciences & BiomedicineBiotechnology & Applied MicrobiologySEVERE PLASTIC-DEFORMATIONBIOMEDICAL APPLICATIONSPSEUDOMONAS-AERUGINOSAESCHERICHIA-COLIATTACHMENTTOPOGRAPHYROUGHNESSASTRONOMYALLOYSGLASS
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