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Manufacturing of Surface Nanostructured Fibers Featuring an Antibacterial Effect by Magnetic Field Transportation of Magnetite@Silver Core-Shell Nanoparticles

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Journal of Materials Science and Chemical Engineering 2017年第12期5卷 1-16页

作者： Roy Buschbeck Franziska Lüttich Sebastian Spange Ronny Kocher michael roder Andreas Heft Bernd Grünler Arnd Schimanski Heinrich Lang Surface Engineering Innovent e.V.Technology DevelopmentJenaGermany Inorganic Chemistry Institute of ChemistryTechnischeUniversität ChemnitzChemnitzGermany

Magnetic core-shell nanoparticles of type Fe3O4@Ag were synthesized in gram scale following a combined co-precipitation phase-transfer method and afterwards, processed to nanoparticle polymer (polypropylene and polyamide) composites. These composites were used as sheath material for the fabrication of core-sheath fibers. During the melt spinning process, a magnetic field was applied around the roving, whereby the particles move in the still liquid sheath polymer towards the surface. The produced fiber materials were investigated by AFM showing a nanostructuring of the surface, which was indirectly confirmed by determination of a slight surface tension lowering. Nanoparticle movement was shown by cross-section SEM and EDX measurements. The antibacterial activity of the spun fibers was proven by contacting them with Escherichia coli. A long-term stability of this effect was observable by carrying out a standard washability test. In contrast to previous works this new approach uses no deposition technique to introduce surface changes. It rather applies a magnetic force to move appropriately equipped nanoparticles from the inside of the fiber to the surface. This leads in only one step to a strong superficial anchoring of the particles resulting in a unique combination of long-term stable antibacterial and improved anti-soiling effects.

关键词： Nanocomposites Polymer Fibers Core-Shell Nanoparticles Magnetic Field Treatment Nanostructured Surface

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Extent and predictors of grade upgrading and downgrading in an Australian cohort according to the new prostate cancer grade groupings

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Asian Journal of Urology 2019年第4期6卷 321-329页

作者： Kerri Beckmann michael O’Callaghan Andrew Vincent Penelope Cohen Martin Borg David roder Sue Evans Jeremy Millar Kim Moretti Cancer Research Institute School of Health SciencesUniversity of South AustraliaAdelaideAustralia School of Cancer and Pharmaceutical Sciences King’s College LondonLondonUK Flinders Medical Centre Urology UnitAdelaideAustralia School of Medicine University of AdelaideAdelaideAustralia SA Pathology Health SAAdelaideSouth AustraliaAustralia Genesis Care University of AdelaideAdelaideAustralia Department of Epidemiology and Preventive Medicine Monash UniversityMelbourneAustralia

Object:To determine the extent and impact of upgrading and downgrading among men who underwent radical prostatectomy(RP)according to new grade groupings and to identify predictors of upgrading from biopsy grade Group Ⅰ and Ⅱ,and downgrading to grade Group I,in a community ***:Study participants included 2279 men with non-metastatic prostate cancer diagnosed 2006-2015 who underwent prostatectomy,from the multi-institutional South Australia Prostate Cancer Clinical Outcomes Collaborative *** of up-or down-grading was assessed by comparing biopsy and prostatectomy grade *** of biochemical recurrence(BCR)with upgrading was assessed using multivariable competing risk *** logistic regression was used to identify pre-treatment predictors of upgrading from grade Groups Ⅰ and Ⅱ,and risk group reclassification among men with low risk ***:Upgrading occurred in 35%of cases,while downgrading occurred in 13%of *** percent with grade Group I disease were upgraded following *** from grade Group I was associated with greater risk of BCR compared with concordant grading(Hazard ratio:3.1,95%confidence interval:1.7-6.0).Older age,higher prostate-specific antigen levels(PSA),fewer biopsy cores,higher number of positive cores and more recent diagnosis predicted upgrading from grade Group Ⅰ,while higher PSA and clinical stage predicted upgrading from grade Group Ⅱ.No clinical risk factors for reclassification were ***:Biopsy sampling errors may play an important role in upgrading from grade Group *** clinical assessment of grade is needed to encourage greater uptake of active surveillance.

关键词： Prostate cancer Grade misclassification Biopsy Radical prostatectomy Pathology

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