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Blum K, Wiest W, Fella C, Balles A, Dittmann J, Rack A, Maier D, Thomann R, Spies BC, Kohal RJ, Zabler S, Nelson K. Fatigue induced changes in conical implant–abutment connections. Dent Mater 2015; 31:1415-26. [DOI: 10.1016/j.dental.2015.09.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 06/23/2015] [Accepted: 09/08/2015] [Indexed: 10/23/2022]
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Alan M, Grolimund E, Kutz A, Christ-Crain M, Thomann R, Falconnier C, Hoess C, Henzen C, Zimmerli W, Mueller B, Schuetz P. Clinical risk scores and blood biomarkers as predictors of long-term outcome in patients with community-acquired pneumonia: a 6-year prospective follow-up study. J Intern Med 2015; 278:174-84. [PMID: 25529395 DOI: 10.1111/joim.12341] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
OBJECTIVE Prediction of long-term outcomes in patients with community-acquired pneumonia (CAP) is incompletely understood. We investigated the value of clinical risk scores [pneumonia severity index (PSI) and CURB-65] (Confusion, Urea, Respiratory rate, Blood Pressure, Age >65 years) and blood biomarkers of different physiopathological pathways in predicting long-term survival in a well-characterized cohort of patients with CAP enrolled in an antibiotic stewardship trial. DESIGN, SETTING AND SUBJECTS Patients admitted with CAP to six medical centres in Switzerland were prospectively followed for 6 years. Cox regression models and area under the receiver operating characteristics curve (AUC) were used to investigate associations between initial risk assessment and all-cause mortality. MAIN OUTCOME MEASURE All-cause mortality during a 6-year follow-up period. RESULTS Six-year mortality in the present cohort (median age 73 years) was 45.1% [95% confidence interval (CI) 41.8-48.3%]. Initial PSI and CURB-65 scores both had excellent long-term prognostic accuracy, with a stepwise increase in mortality per risk class. The hazard ratios (95% CI) of the highest PSI and CURB-65 classes (reference: lowest class) were 38.0 (14.0-103.0) and 7.8 (2.2-14.5), respectively, after 6 years. The addition of inflammatory (pro-adrenomedullin) and cardiac (pro-atrial natriuretic peptide) blood biomarkers measured upon hospital admission further improved the prognostic capabilities of the PSI (AUC increase from 0.79 to 0.83; P < 0.0001) and the CURB-65 score (AUC increase from 0.73 to 0.80; P < 0.001). CONCLUSION Risk assessment using clinical scores allowed accurate long-term prognostication, which was further improved by the addition of two inflammatory (pro-adrenomedullin) and cardiac (pro-atrial natriuretic peptide) blood biomarkers. These data provide a rationale for a more risk-adapted, 'personalized' strategy for long-term management of patients with CAP.
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Szabó Á, Wacha A, Thomann R, Szarka G, Bóta A, Iván B. Synthesis of Poly(methyl methacrylate)-poly(poly(ethylene glycol) methacrylate)-polyisobutylene ABCBA Pentablock Copolymers by Combining Quasiliving Carbocationic and Atom Transfer Radical Polymerizations and Characterization Thereof. JOURNAL OF MACROMOLECULAR SCIENCE PART A-PURE AND APPLIED CHEMISTRY 2015. [DOI: 10.1080/10601325.2015.1007268] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Keutmann IC, Melzer B, Seidel R, Thomann R, Speck T. Review: The Functions of Phytoliths in Land Plants. BIOLOGICALLY-INSPIRED SYSTEMS 2015. [DOI: 10.1007/978-94-017-9398-8_9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Gao F, Thomann R, Nebel CE. Aligned Pt-diamond core-shell nanowires for electrochemical catalysis. Electrochem commun 2015. [DOI: 10.1016/j.elecom.2014.11.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Blum CA, Nigro N, Briel M, Schuetz P, Ullmer E, Suter-Widmer I, Winzeler B, Bingisser R, Elsaesser H, Drozdov D, Arici B, Urwyler SA, Refardt J, Tarr P, Wirz S, Thomann R, Baumgartner C, Duplain H, Burki D, Zimmerli W, Rodondi N, Mueller B, Christ-Crain M. Adjunct prednisone therapy for patients with community-acquired pneumonia: a randomized, placebo-controlled multicenter trial. Crit Care 2015. [PMCID: PMC4470455 DOI: 10.1186/cc14205] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Drechsler M, Garbacz G, Thomann R, Schubert R. Development and evaluation of chitosan and chitosan/Kollicoat® Smartseal 30 D film-coated tablets for colon targeting. Eur J Pharm Biopharm 2014; 88:807-15. [DOI: 10.1016/j.ejpb.2014.09.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2014] [Revised: 08/19/2014] [Accepted: 09/18/2014] [Indexed: 10/24/2022]
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Beckert F, Bodendorfer S, Zhang W, Thomann R, Mülhaupt R. Mechanochemical Route to Graphene-Supported Iron Catalysts for Olefin Polymerization and in Situ Formation of Carbon/Polyolefin Nanocomposites. Macromolecules 2014. [DOI: 10.1021/ma501602j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Skaria S, Thomann R, Gómez-Garcia CJ, Vanmaele L, Loccufier J, Frey H, Stiriba SE. A convenient approach to amphiphilic hyperbranched polymers with thioether shell for the preparation and stabilization of coinage metal (Cu, Ag, Au) nanoparticles. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/pola.27134] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Güder F, Frei E, Kücükbayrak UM, Menzel A, Thomann R, Luptak R, Hollaender B, Krossing I, Zacharias M. Engineered high aspect ratio vertical nanotubes as a model system for the investigation of catalytic methanol synthesis over Cu/ZnO. ACS APPLIED MATERIALS & INTERFACES 2014; 6:1576-1582. [PMID: 24392784 DOI: 10.1021/am4042959] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Catalytically synthesized methanol from H2 and CO2 using porous Cu/ZnO aggregates is a promising, carbon neutral, and renewable alternative to replace fossil fuel based transport fuels. However, the absence of surface-engineered model systems to understand and improve the industrial Cu/ZnO catalyst poses a big technological gap in efforts to increase industrial methanol conversion efficiency. In this work, we report a novel process for the fabrication of patterned, vertically aligned high aspect ratio 1D nanostructures on Si that can be used as an engineered model catalyst. The proposed strategy employs near-field phase shift lithography (NF-PSL), deep reactive ion etching (DRIE), and atomic layer deposition (ALD) to pattern, etch, and coat Si wafers to produce high aspect ratio 1D nanostructures. Using this method, we produced a model system consisting of high aspect ratio Cu-decorated ZnO nanotubes (NTs) to investigate the morphological effects of ZnO catalyst support in comparison to the planar Cu/ZnO catalyst in terms of the catalytic reactions. The engineered catalysts performed 70 times better in activating CO2 than the industrial catalyst. In light of the obtained results, several important points are highlighted, and recommendations are made to achieve higher catalytic performance.
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Turcsán T, Mészáros L, Khumalo VM, Thomann R, Karger-Kocsis J. Fracture behavior of boehmite-filled polypropylene block copolymer nanocomposites as assessed by the essential work of fracture concept. J Appl Polym Sci 2014. [DOI: 10.1002/app.40447] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Forget A, Christensen J, Lüdeke S, Kohler E, Tobias S, Matloubi M, Thomann R, Shastri VP. Polysaccharide hydrogels with tunable stiffness and provasculogenic properties via α-helix to β-sheet switch in secondary structure. Proc Natl Acad Sci U S A 2013; 110:12887-92. [PMID: 23886665 PMCID: PMC3740890 DOI: 10.1073/pnas.1222880110] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Mechanical aspects of the cellular environment can influence cell function, and in this context hydrogels can serve as an instructive matrix. Here we report that physicochemical properties of hydrogels derived from polysaccharides (agarose, κ-carrageenan) having an α-helical backbone can be tailored by inducing a switch in the secondary structure from α-helix to β-sheet through carboxylation. This enables the gel modulus to be tuned over four orders of magnitude (G' 6 Pa-3.6 × 10(4) Pa) independently of polymer concentration and molecular weight. Using carboxylated agarose gels as a screening platform, we demonstrate that soft-carboxylated agarose provides a unique environment for the polarization of endothelial cells in the presence of soluble and bound signals, which notably does not occur in fibrin and collagen gels. Furthermore, endothelial cells organize into freestanding lumens over 100 μm in length. The finding that a biomaterial can modulate soluble and bound signals provides impetus for exploring mechanobiology paradigms in regenerative therapies.
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Beckert F, Rostas AM, Thomann R, Weber S, Schleicher E, Friedrich C, Mülhaupt R. Self-Initiated Free Radical Grafting of Styrene Homo- and Copolymers onto Functionalized Graphene. Macromolecules 2013. [DOI: 10.1021/ma400895f] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Appel AK, Thomann R, Mülhaupt R. Hydroxyalkylation and Polyether Polyol Grafting of Graphene Tailored for Graphene/Polyurethane Nanocomposites. Macromol Rapid Commun 2013; 34:1249-55. [DOI: 10.1002/marc.201300363] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2013] [Revised: 06/04/2013] [Indexed: 11/07/2022]
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Thomann R, Schütz P, Müller B, Thomke S, Schoenenberger R, Keller U. Evaluation of an algorithm for intensive subcutaneous insulin therapy in noncritically ill hospitalised patients with hyperglycaemia in a randomised controlled trial. Swiss Med Wkly 2013; 143:w13808. [DOI: 10.4414/smw.2013.13808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Schadt K, Kerscher B, Thomann R, Mülhaupt R. Structured Semifluorinated Polymer Ionic Liquids for Metal Nanoparticle Preparation and Dispersion in Fluorous Compartments. Macromolecules 2013. [DOI: 10.1021/ma400551e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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Kerscher B, Appel AK, Thomann R, Mülhaupt R. Treelike Polymeric Ionic Liquids Grafted onto Graphene Nanosheets. Macromolecules 2013. [DOI: 10.1021/ma400738k] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Schneider J, Jallouk AP, Vasquez D, Thomann R, Forget A, Pino CJ, Shastri VP. Surface functionality as a means to impact polymer nanoparticle size and structure. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:4092-4095. [PMID: 23438034 DOI: 10.1021/la304075c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
When polymeric nanoparticles (NPs) are formed by nanoprecipitation, which is a nucleation-growth process, the control over size requires changing the polymer concentration or solvent composition. Here, we demonstrate that the NP size can be controlled independent of polymer variables by introducing a polyelectrolyte (PE) in the aqueous phase. PEs that exhibit hydrogen bonding (H-bonding) yield a reduction in NP size, whereas PEs that do not possess this characteristic promote the formation of larger NPs. The observed effect can be attributed to the formation of a diffusional barrier around the NP in the form of a dense shell. This principle of controlling NP size is not limited to polymers and can also be employed in the production of lipid NPs.
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Jahanshahi K, Botiz I, Reiter R, Thomann R, Heck B, Shokri R, Stille W, Reiter G. Crystallization of Poly(γ-benzyl l-glutamate) in Thin Film Solutions: Structure and Pattern Formation. Macromolecules 2013. [DOI: 10.1021/ma3024602] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Schüler F, Kerscher B, Beckert F, Thomann R, Mülhaupt R. Hyperbranched Polymeric Ionic Liquids with Onion-like Topology as Transporters and Compartmentalized Systems. Angew Chem Int Ed Engl 2012; 52:455-8. [DOI: 10.1002/anie.201205130] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2012] [Revised: 08/31/2012] [Indexed: 11/07/2022]
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46
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Schüler F, Kerscher B, Beckert F, Thomann R, Mülhaupt R. Hyperverzweigte polymere ionische Flüssigkeiten mit zwiebelartiger Topologie als Transporter und kompartimentierte Systeme. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201205130] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Škovranová L, Borsig E, Streller R, Thomann R, Mülhaupt R, Ujhelyiová A, Berek D, Patsiga RA. Polypropylene + boehmite nanocomposite fibers. JOURNAL OF POLYMER ENGINEERING 2012. [DOI: 10.1515/polyeng-2012-0010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The influence of nanosized filler particles on mechanical properties of composite fibers has some specific features related to the fiber matrix, its preparation and the filler content, as well as the orientation of the fibers at their drawing. This paper discusses the manner of dispersion of chemically unmodified boehmite type nanofiller, Disperal 40 (D40) or Disperal 60 (D60) in polypropylene (iPP) fibers, and the influence of filler and its particle size on the tenacity, modulus and elongation of the iPP fibers. It was found that filler D40 was effective in increasing the tenacity only up to a content of about 1 wt% and in fibers prepared only at higher drawing ratios. Transmission electron microscopy (TEM) pictures of the cut iPP+D40 or iPP+D60 fibers have shown the presence of aggregation of nanosized boehmite particles in all cases. A comparison of the effects of two different particle sized fillers on the mechanical properties of the isotactic PP (iPP) fibers showed that a small difference between the particle sizes of both kinds of filler plays some role regarding the tensile strength of the fibers. The iPP fibers containing a mixture of D40 and D60 showed some deviations from the expected sum of the effects of both fillers on their mechanical properties.
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Appel AK, Thomann R, Mülhaupt R. Polyurethane nanocomposites prepared from solvent-free stable dispersions of functionalized graphene nanosheets in polyols. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.09.016] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ho CH, Thiel M, Celik S, Odermatt EK, Berndt I, Thomann R, Tiller JC. Conventional and microwave-assisted synthesis of hyperbranched and highly branched polylysine towards amphiphilic core–shell nanocontainers for metal nanoparticles. POLYMER 2012. [DOI: 10.1016/j.polymer.2012.08.032] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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50
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Beckert F, Friedrich C, Thomann R, Mülhaupt R. Sulfur-Functionalized Graphenes as Macro-Chain-Transfer and RAFT Agents for Producing Graphene Polymer Brushes and Polystyrene Nanocomposites. Macromolecules 2012. [DOI: 10.1021/ma301379z] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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