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  • 51.
    Sjögren, Torsten
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Hållfasthet (BMh).
    Lausmaa, Jukka
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf).
    Snis, Anders
    Engqvist, Håkan
    Karlsson, Joakim
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Digital image correlation analysis of local strain fields on Ti6A14V manufactured by electron beam melting2014Ingår i: Materials Science & Engineering A, Vol. 618, s. 456-461Artikel i tidskrift (Övrigt vetenskapligt)
  • 52.
    Sjövall, Peter
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf).
    Carlred, Louise
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Liposome binding for multiplexed biomolecule detection and imaging using ToF-SIMS2014Ingår i: Surface and Interface Analysis, ISSN 0142-2421, E-ISSN 1096-9918, Vol. 46, nr 10-11, s. 707-711Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A novel approach for multiplexed biomolecule detection at surfaces, involving specific binding of liposomes and subsequent analysis by time-of-flight secondary ion mass spectrometry (ToF-SIMS), was evaluated with respect to its capability for quantitative analysis of biomolecule surface concentrations. The specific binding of liposomes to a poly(L-lysine)-g-poly (ethylene glycol) (PLL-g-PEG) surface, using the biotin-avidin coupling chemistry, was characterized by quartz crystal microbalance with dissipation monitoring (QCM-D), fluorescence microscopy and ToF-SIMS. The ToF-SIMS results showed a linearly increasing signal from the liposomes up to a saturation coverage corresponding to a full liposome layer on the surface, in close agreement with fluorescence microscopy analysis of the same samples, strongly supporting the potential of the liposome-based approach for quantitative biomolecule detection. However, the multiplexing capability and issues on nonspecific binding need further studies. Furthermore, an improved method for the preparation of lipid bilayer samples for ToF-SIMS analysis is presented, demonstrating the imaging of individual 210-nm diameter liposomes adsorbed on a SiO2 surface.

  • 53.
    Sjövall, Peter
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf).
    Lausmaa, Jukka
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf).
    Petronis, Sarunas
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Osteogenic response of human mesenchymal stem cells to well-defined nanoscale topography in vitro2014Ingår i: International Journal of Nanomedicine, ISSN 1176-9114, E-ISSN 1178-2013, Vol. 9, nr 1, s. 2499-2515Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Background: Patterning medical devices at the nanoscale level enables the manipulation of cell behavior and tissue regeneration, with topographic features recognized as playing a significant role inthe osseointegration of implantable devices. Methods: In this study, we assessed the ability of titanium-coated hemisphere-like topographic nanostructures of different sizes (approximately 50, 100, and 200 nm) to influence the morphology, proliferation, and osteogenic differentiation of human mesenchymal stem cells (hMSCs). Results: We found that the proliferation and osteogenicdifferentiation of hMSCs was influenced by the size of the underlying structures, suggesting that size variations in topographic features at the nanoscale level, independently of chemistry, can be exploited to control hMSC behavior in a size-dependent fashion. Conclusion: Our studies demonstrate that colloidal lithography, in combination with coating technologies, can be exploited to investigate the cell response to well defined nanoscale topography and to develop next-generation surfaces that guide tissue regeneration and promote implant integration.

  • 54.
    Solstad, Runar Gjerp
    et al.
    UiT The Arctic University of Norway, Norway.
    Li, Chun
    UiT The Arctic University of Norway, Norway.
    Isaksson, Johan
    UiT The Arctic University of Norway, Norway.
    Johansen, Jostein
    UiT The Arctic University of Norway, Norway.
    Svenson, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik. UiT The Arctic University of Norway, Norway.
    Stensvåg, Klara
    UiT The Arctic University of Norway, Norway.
    Haug, Tor
    UiT The Arctic University of Norway, Norway.
    Novel antimicrobial peptides EeCentrocins 1, 2 and EeStrongylocin 2 from the Edible sea urchin Echinus esculentus have 6-br-trp post-translational modifications2016Ingår i: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 11, nr 3, artikel-id e0151820Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The global problem of microbial resistance to antibiotics has resulted in an urgent need to develop new antimicrobial agents. Natural antimicrobial peptides are considered promising candidates for drug development. Echinoderms, which rely on innate immunity factors in the defence against harmful microorganisms, are sources of novel antimicrobial peptides. This study aimed to isolate and characterise antimicrobial peptides from the Edible sea urchin Echinus esculentus. Using bioassay-guided purification and cDNA cloning, three antimicrobial peptides were characterised from the haemocytes of the sea urchin; two heterodimeric peptides and a cysteine-rich peptide. The peptides were named EeCentrocin 1 and 2 and EeStrongylocin 2, respectively, due to their apparent homology to the published centrocins and strongylocins isolated from the green sea urchin Strongylocentrotus droebachiensis. The two centrocin-like peptides EeCentrocin 1 and 2 are intramolecularly connected via a disulphide bond to form a heterodimeric structure, containing a cationic heavy chain of 30 and 32 amino acids and a light chain of 13 amino acids. Additionally, the light chain of EeCentrocin 2 seems to be N-terminally blocked by a pyroglutamic acid residue. The heavy chains of EeCentrocins 1 and 2 were synthesised and shown to be responsible for the antimicrobial activity of the natural peptides. EeStrongylocin 2 contains 6 cysteines engaged in 3 disulphide bonds. A fourth peptide (Ee4635) was also discovered but not fully characterised. Using mass spectrometric and NMR analyses, EeCentrocins 1 and 2, EeStrongylocin 2 and Ee4635 were all shown to contain post-translationally brominated Trp residues in the 6 position of the indole ring.

  • 55.
    Stenlund, Patrik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Healing of complement activating Ti implants compared with non-activating Ti in rat tibia2012Ingår i: Acta Biomaterialia, ISSN 1742-7061, E-ISSN 1878-7568, Vol. 8, nr 9, s. 3532-3540Artikel i tidskrift (Refereegranskat)
  • 56.
    Stenlund, Patrik
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik. University of Gothenburg, Sweden.
    Kurosu, Shingo
    Tohoku University, Japan.
    Koizumi, Yuichiro
    Tohoku University, Japan.
    Suska, Felicia
    University of Gothenburg, Sweden.
    Matsumoto, Hiroaki
    Tohoku University, Japan.
    Chiba, Akihiko
    Tohoku University, Japan.
    Palmquist, Anders
    University of Gothenburg, Sweden.
    Osseointegration Enhancement by Zr doping of Co-Cr-Mo Implants Fabricated by Electron Beam Melting2015Ingår i: Additive Manufacturing, ISSN 2214-8604, Vol. 6, s. 6-15Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Direct osseous healing to prosthetic components is a prerequisite for the clinical success of uncemented treatment in total hip replacements (THR). The demands imposed on the material properties are constantly being stepped up to withstand the impact of an active lifestyle and ensure lifelong integration. Cobalt–chromium–molybdenum (Co-Cr-Mo) materials are interesting for their excellent mechanical stability, corrosion resistance and possibility to be produced by additive manufacturing into complex designs with modifiable stiffness. The bone response to Co-Cr-Mo is regarded as inferior to that of titanium and are usually cemented in THR. The hypothesis in the present study was that a low amount of Zr in the Co-Cr-Mo alloy would improve the bone response and biomechanical anchorage. The results showed significantly higher implant stability for the Co-Cr-Mo alloy with an addition of 0.04% Zr after eight weeks of healing in rabbits, while no major differences were observed in the amount of bone formed around the implants. Further, bone tissue grew into surface irregularities and in direct contact with the implant surfaces. It is concluded that additively manufactured Co-Cr-Mo alloy implants osseointegrate and that the addition of a low amount of Zr to the bulk Co-Cr-Mo further improves the bone anchorage.

  • 57.
    Stenlund, Patrik
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik. University of Gothenburg, Sweden.
    Omar, Omar
    University of Gothenburg, Sweden.
    Brohede, Ulrika
    University of Gothenburg, Sweden; Sandvik Coromant R&D, Sweden.
    Norgren, Susanne
    University of Gothenburg, Sweden; Sandvik Coromant R&D, Sweden; Uppsala University, Sweden.
    Norlindh, Birgitta
    University of Gothenburg, Sweden.
    Johansson, Anna
    University of Gothenburg, Sweden.
    Lausmaa, Jukka
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf). University of Gothenburg, Sweden.
    Thomsen, Peter
    University of Gothenburg, Sweden.
    Palmquist, Anders
    University of Gothenburg, Sweden.
    Bone response to a novel Ti-Ta-Nb-Zr alloy2015Ingår i: Acta Biomaterialia, ISSN 1742-7061, E-ISSN 1878-7568, Vol. 20, s. 165-175Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Commercially pure titanium (cp-Ti) is regarded as the state-of-the-art material for bone-anchored dental devices, whereas the mechanically stronger alloy (Ti–6Al–4V), made of titanium, aluminum (Al) and vanadium (V), is regarded as the material of choice for high-load applications. There is a call for the development of new alloys, not only to eliminate the potential toxic effect of Al and V but also to meet the challenges imposed on dental and maxillofacial reconstructive devices, for example. The present work evaluates a novel, dual-stage, acid-etched, Ti–Ta–Nb–Zr alloy implant, consisting of elements that create low toxicity, with the potential to promote osseointegration in vivo. The alloy implants (denoted Ti–Ta–Nb–Zr) were evaluated after 7 days and 28 days in a rat tibia model, with reference to commercially pure titanium grade 4 (denoted Ti). Analyses were performed with respect to removal torque, histomorphometry and gene expression. The Ti–Ta–Nb–Zr showed a significant increase in implant stability over time in contrast to the Ti. Further, the histological and gene expression analyses suggested faster healing around the Ti–Ta–Nb–Zr, as judged by the enhanced remodeling, and mineralization, of the early-formed woven bone and the multiple positive correlations between genes denoting inflammation, bone formation and remodeling. Based on the present experiments, it is concluded that the Ti–Ta–Nb–Zr alloy becomes osseointegrated to at least a similar degree to that of pure titanium implants. This alloy is therefore emerging as a novel implant material for clinical evaluation.

  • 58.
    Stensen, Wenche
    et al.
    UiT The Arctic University of Norway, Norway; Lytix Biopharma AS, Norway.
    Turner, Rob
    MedPharm Ltd, UK.
    Brown, Marc
    MedPharm Ltd, UK; University of Hertfordshire, UK.
    Kondori, Nahid
    University of Gothenburg, Sweden.
    Svendsen, John Sigurd
    UiT The Arctic University of Norway, Norway; Lytix Biopharma AS, Norway.
    Svenson, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Short cationic antimicrobial peptides display superior antifungal activities toward Candidiasis and Onychomycosis in comparison with Terbinafine and Amorolfine2016Ingår i: Molecular Pharmaceutics, ISSN 1543-8384, E-ISSN 1543-8392, Vol. 13, nr 10, s. 3595-3600Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Novel antifungals are in high demand due to the challenges associated with resistant, persistent, and systemic fungal infections. Synthetic mimics of antimicrobial peptides are emerging as a promising class of compounds for antifungal treatment. In the current study, five synthetic cationic antimicrobial tripeptides were evaluated as antifungal therapeutics against 24 pathogenic strains of fungi. Three of the peptides displayed strong general antifungal properties at low micromolar inhibitory concentrations. The most promising peptide, compound 5, was selected and evaluated as an antifungal remedy for Candida albicans candidiasis in a human skin model and for the treatment of Trichophyton rubrum induced onychomycosis in an infected human nail model. Compound 5 was shown to display antifungal properties and a rapid mode of action superior to those of both the commercial comparators Loceryl and Lamisil. Compound 5 was also active against a clinical isolate of Candida albicans with acquired fluconazole resistance.

  • 59.
    Svenson, Johan
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    På jakt efter nya läkemedel i Ishavet2016Ingår i: Naturvetare, ISSN 2000-2424, Vol. 6, s. 24-28Artikel i tidskrift (Övrig (populärvetenskap, debatt, mm))
    Abstract [sv]

    Ungefär en tredjedel av alla läkemedel har sin källa i naturen. Forskaren Johan Svenson skriver själv om sin expedition i Arktis, där forskarna samlar in alger och andra organismer i sökandet efter nya molekyler, som till exempel kan bli ny antibiotika.

  • 60.
    Svensson, Sara
    et al.
    University of Gothenburg, Sweden.
    Trobos, Margarita
    University of Gothenburg, Sweden.
    Hoffman, Maria
    University of Gothenburg, Sweden.
    Norlindh, Birgitta
    University of Gothenburg, Sweden.
    Petronis, Sarunas
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Lausmaa, Jukka
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Funktionella material (KMf).
    Suska, Felicia
    University of Gothenburg, Sweden.
    Thomsen, Peter
    University of Gothenburg, Sweden.
    A novel soft tissue model for biomaterial-associated infection and inflammation - Bacteriological, morphological and molecular observations2015Ingår i: Biomaterials, ISSN 0142-9612, E-ISSN 1878-5905, Vol. 41, s. 106-121Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Infection constitutes a major risk for implant failure, but the reasons why biomaterial sites are more vulnerable than normal tissue are not fully elucidated. In this study, a soft tissue infection model was developed, allowing the analysis of cellular and molecular responses in each of the sub-compartments of the implant-tissue interface (on the implant surface, in the surrounding exudate and in the tissue). Smooth and nanostructured titanium disks with or without noble metal chemistry (silver, gold, palladium), and sham sites, were inoculated with Staphylococcus epidermidis and analysed with respect to number of viable bacteria, number, viability and gene expression of host cells, and using different morphological techniques after 4 h, 24 h and 72 h. Non-infected rats were controls. Results showed a transient inflammatory response at control sites, whereas bacterial administration resulted in higher recruitment of inflammatory cells (mainly polymorphonuclear), higher, continuous cell death and higher gene expression of tumour necrosis factor-alpha, interleukin-6, interleukin-8, Toll-like receptor 2 and elastase. At all time points, S. epidermidis was predominantly located in the interface zone, extra- and intracellularly, and lower levels were detected on the implants compared with surrounding exudate. This model allows detailed analysis of early events in inflammation and infection associated to biomaterials in vivo leading to insights into host defence mechanisms in biomaterial-associated infections.

  • 61.
    Thiel, V.
    et al.
    University of Göttingen, Germany.
    Lausmaa, Jukka
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Sjövall, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Ragazzi, E.
    University of Padova, Italy.
    Seyfullah, L. J.
    University of Göttingen, Germany.
    Schmidt, A. R.
    University of Göttingen, Germany.
    Microbe-like inclusions in tree resins and implications for the fossil record of protists in amber2016Ingår i: Geobiology, ISSN 1472-4677, E-ISSN 1472-4669, Vol. 14, nr 4, s. 364-373Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    During the past two decades, a plethora of fossil micro-organisms have been described from various Triassic to Miocene ambers. However, in addition to entrapped microbes, ambers commonly contain microscopic inclusions that sometimes resemble amoebae, ciliates, microfungi, and unicellular algae in size and shape, but do not provide further diagnostic features thereof. For a better assessment of the actual fossil record of unicellular eukaryotes in amber, we studied equivalent inclusions in modern resin of the Araucariaceae; this conifer family comprises important amber-producers in Earth history. Using time-of-flight secondary ion mass spectrometry (ToF-SIMS), we investigated the chemical nature of the inclusion matter and the resin matrix. Whereas the matrix, as expected, showed a more hydrocarbon/aromatic-dominated composition, the inclusions contain abundant salt ions and polar organics. However, the absence of signals characteristic for cellular biomass, namely distinctive proteinaceous amino acids and lipid moieties, indicates that the inclusions do not contain microbial cellular matter but salts and hydrophilic organic substances that probably derived from the plant itself. Rather than representing protists or their remains, these microbe-like inclusions, for which we propose the term 'pseudoinclusions', consist of compounds that are immiscible with the terpenoid resin matrix and were probably secreted in small amounts together with the actual resin by the plant tissue. Consequently, reports of protists from amber that are only based on the similarity of the overall shape and size to extant taxa, but do not provide relevant features at light-microscopical and ultrastructural level, cannot be accepted as unambiguous fossil evidence for these particular groups.

  • 62. Thiel, V.
    et al.
    Sjövall, Peter
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Time-of-flight secondary ion mass spectrometry (TOF-SIMS): Principles and practice in the biogeosciences2014Ingår i: Principles and practice of analytical techniques in Geosciences / [ed] Kliti Grice, Royal Society of Chemistry, 2014, nr 4, s. 122-170Kapitel i bok, del av antologi (Refereegranskat)
    Abstract [en]

    Time-of-flight secondary ion mass spectrometry (TOF-SIMS) provides chemical information on the outermost molecular layers of sample surfaces without solvent extraction. In TOF-SIMS, a pulsed beam of high-energy ions (primary ions) is scanned over a selected analysis area on the sample. During the primary ion bombardment, neutral and charged particles (secondary ions) are released from the outermost molecular layers of the sample surface. Analysis of the secondary ions in a TOF analyser yields a mass spectral data set that allows the retrospective production of(1) ion images showing the spatial signal intensity distribution from selected ions over the analysis area; (2) mass spectra from the total analysis area; or (3) mass spectra from user-defined regions of interest inside the analysis area. In the so-called static SIMS regime, the primary ions are provided in very short pulses and the analysis is completed before the incoming primary ions damage a significant fraction of the surface. Static TOF-SIMS is therefore capable of providing molecularly specific secondary ions, and thus mass spectra with detailed organic information, which is not possible with other (‘dynamic’) SIMS techniques. In this chapter, we describe the principles of static TOF-SIMS instrumentation and data evaluation, review a number of relevant applications, and discuss the potential of this technique in the biogeosciences, with a focus on organic biomarker applications.

  • 63. Zaborowska, M
    et al.
    Bodin, A
    Bäckdahl, Henrik
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Popp, J
    Goldstein, A
    Gatenholm, P
    Microporous bacterial cellulose as a potential scaffold for bone regeneration2010Ingår i: Acta Biomater, Vol. 6, nr 7, s. 233939-Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Microporous bacterial cellulose as a potential scaffold for bone regeneration. Acta Biomater. Jul;6(7):2540-7, 2010

  • 64.
    Ålgårdh Karlsson, Joakim
    et al.
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik. Uppsala University, Sweden.
    Horn, Timothy
    North Carolina State University, US.
    West, Harvey
    North Carolina State University, US.
    Aman, Ronald
    North Carolina State University, US.
    Snis, Anders
    Arcam AB, Sweden.
    Engqvist, Håkan
    Uppsala University, Sweden.
    Lausmaa, Jukka
    RISE., SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Harrysson, Ola
    North Carolina State University, US.
    Thickness dependency of mechanical properties for thin-walled titanium parts manufactured by Electron Beam Melting (EBM)®2016Ingår i: Additive Manufacturing, ISSN 2214-8604, Vol. 12, s. 45-50Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Metal powder bed additive manufacturing technologies, such as the Electron Beam Melting process, facilitate a high degree of geometric flexibility and have been demonstrated as useful production techniques for metallic parts.However, the EBM process is typically associated with lower resolutions and higher surface roughness compared to similar laser-based powder bed metal processes. In part, this difference is related to the larger powder size distribution and thicker layers normally used. As part of an effort to improve the resolution and surface roughness of EBM fabricated components, this study investigates the feasibility of fabricating components with a smaller powder size fraction and layer thickness (similar to laser based processes). The surface morphology, microstructure and tensile properties of the produced samples were evaluated. The findings indicate that microstructure is dependent on wall-thickness and that, for thin walled structures, tensile properties can become dominated by variations in surface roughness.

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