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  • 1.
    Ankerfors, M.
    et al.
    RISE, Innventia.
    Duker, E.
    Lindström, T.
    RISE, Innventia.
    Topo-chemical modification of fibres by grafting of carboxymethyl cellulose in pilot scale2013In: Nordic Pulp and Paper Research Journal, ISSN 0283-2631 , no 1, p. 6-14Article in journal (Refereed)
  • 2.
    Athley, Karin
    et al.
    RISE, Innventia.
    Granlöf, Lars
    RISE, Innventia.
    Söderberg, Daniel
    RISE, Innventia.
    Ström, Göran
    RISE, Innventia.
    Optimizing the benefit of retention chemicals2014Conference paper (Refereed)
    Abstract [en]

    Pre-flocculation of filler has been tested as a concept for improving the retention of filler and the strength properties of the sheet. The impact of the size of the filler floes on the mechanical retentionin a fibre network was investigated using a modified laboratory hand sheet former. The mechanical retention was found to increase linearly with both particle size and grammage of the fibre web. These results were confirmed in a full scale production trial on the FEX pilot paper machine at Innventia. Here different filler floe sizes were created through different chemical pre-flocculation strategies. The particle size in the flow to the headbox was measured with FBRM, and a linear relation between particle size and filler retention was found. Corresponding linear relation was seen in a pilot trial when adding filler and retention aid conventionally. This implies that mechanical retention constitute an important part of the filler retention not only upon pre-flocculation but also with conventional addition of filler and retention aid. Thus, the particle size before the headbox can be a good indicator of the retention level. For the conventional application of a two component retention aid system, the increased filler retention correlated to impaired formation and decreased sheet strength. On the contrary, pre-flocculation led to an increase in both sheet strength and filler retention, demonstrating the advantage of pre-flocculating filler.

  • 3. Bergenstråhle-Wohlert, M.
    et al.
    Berglund, L.A.
    Brady, J.W.
    Larsson, P.T.
    RISE, Innventia.
    Westlund, P.-O.
    Wohlert, J.
    Concentration enrichment of urea at cellulose surfaces: Results from molecular dynamics simulations and NMR spectroscopy2012In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, no 1, p. 1-12Article in journal (Refereed)
  • 4. Bergstrm, E.M.
    et al.
    Salmen, L.
    RISE, Innventia.
    Kochumalayil, J.
    Berglund, L.
    Plasticized xyloglucan for improved toughness: Thermal and mechanical behaviour2012In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, no 4, p. 2532-2537Article in journal (Refereed)
  • 5.
    Björklund Jansson, Marianne
    et al.
    RISE, Innventia.
    Nilvebrant, N. -O
    Wood Extractives2009In: Wood Chemistry and Wood Biotechnology, Walter de Gruyter, 2009, p. 147-171Chapter in book (Refereed)
  • 6.
    Brodin, Ida
    et al.
    RISE, Innventia.
    Ernstsson, Marie
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    Gellerstedt, Göran
    RISE, Innventia.
    Sjöholm, Elisabeth
    RISE, Innventia.
    Oxidative stabilisation of kraft lignin for carbon fibre production2012In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, no 2, p. 141-147Article in journal (Refereed)
    Abstract [en]

    With the aim of investigating kraft lignin as a raw material for carbon fibre production, different lignins have been stabilised in air at conditions varied according to a full factorial experimental design. The lignins under examination were purified kraft lignin powders originating from birch, spruce/pine and Eucalyptus globules, as well as lignin fibres originating from birch with 5 poly(ethylene oxide) (PEO) added as a plasticiser. The influence of temperature, time and heating rate on yield and glass-transition temperature (Tg) was investigated. The highest yield was achieved after stabilisation at 280°C during 2h with a heating rate of 0.2°C min -1. The Tg of all lignin powders was increased when stabilisation occurred under harsher conditions. X-ray photoelectron spectroscopy analysis (XPS) of both the outer surface and the cleaved cross-section of individual lignin/PEO fibres showed a clear gradient in the degree of chemical modification, with the major change occurring on the surface resulting in the appearance of a skin-core structure after stabilisation. The behaviour of the lignin fibres during stabilisation is similar to that of pitch-based fibres, indicating good possibilities for lignin as raw material for carbon fibre production.

  • 7. Carrick, C.
    et al.
    Ruda, M.
    Pettersson, B.
    Larsson, P.T.
    RISE, Innventia.
    Wågberg, L.
    Hollow cellulose capsules from CO2 saturated cellulose solutions: Their preparation and characterization2013In: RSC Advances, ISSN  2046-2069, no 7, p. 2462-2469Article in journal (Refereed)
  • 8.
    Chedid, Fadia
    et al.
    RISE, Innventia.
    Aldaeus, Fredrik
    RISE, Innventia.
    Jacobs, Anna
    RISE, Innventia.
    Lignin molecular mass determined using size-exclusion chromatography and MALDI-TOF mass spectrometry2014Conference paper (Refereed)
  • 9. Dammström, S.
    et al.
    Salmen, Lennart
    RISE, STFI-Packforsk.
    Gatenholm, P.
    On the interactions between cellulose and xylan, a biomimetic simulation of the hardwood cell wall2009In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 4, no 1, p. 3-14Article in journal (Refereed)
    Abstract [en]

    The plant cell wall exhibits a hierarchical structure, in which the organization of the constituents on different levels strongly affects the mechanical properties and the performance of the material. In this work, the interactions between cellulose and xylan in a model system consisting of a bacterial cellulose/glucuronoxylan (extracted from aspen, Populus tremula) have been studied and compared to that of a delignified aspen fiber material. The properties of the materials were analyzed using Dynamical Mechanical Analysis (DMA) with moisture scans together with dynamic Infra Red -spectroscopy at dry and humid conditions. The results showed that strong interactions existed between the cellulose and the xylan in the aspen holocellulose. The same kinds of interactions were seen in a water-extracted bacterial cellulose/xylan composite, while unextracted material showed the presence of xylan not interacting with the cellulose. Based on these findings for the model system, it was suggested that there is in hardwood one fraction of xylan that is strongly associated with the cellulose, taking a similar role as glucomannan in softwood.

  • 10.
    Dedic, D.
    et al.
    RISE, Innventia.
    Iversen, T.
    RISE, Innventia.
    Ek, M.
    Cellulose degradation in the Vasa: The role of acids and rust2013In: Studies in Conservation, ISSN 0039-3630, E-ISSN 2047-0584, no 4, p. 308-313Article in journal (Refereed)
  • 11.
    Dedic, D.
    et al.
    RISE, Innventia.
    Iversen, T.
    RISE, Innventia.
    Sandberg, T.
    Ek, M.
    Chemical analysis of wood extractives and lignin in the oak wood of the 380 year old Swedish warship vasa2011Conference paper (Refereed)
  • 12.
    Dedic, Dina
    et al.
    RISE, Innventia.
    Iversen, Tommy
    RISE, Innventia.
    Ek, M.
    Cellulose degradation in the Vasa: The role of acids and rust2013In: Studies in Conservation, ISSN 0039-3630, E-ISSN 2047-0584, Vol. 58, no 4, p. 308-313Article in journal (Refereed)
    Abstract [en]

    The oak timbers of the Swedish warship Vasa are deteriorating. High amounts of oxalic acid have been found along with a low pH and low molecular weight cellulose deep in the wood timbers. The iron-rich surface wood differs from the interior wood in that it displays higher pH and cellulose with higher molecular weight. The objective of this study was to determine why there is a difference in cellulose degradation, pH, and oxalic acid amount between the surface region and the interior of the Vasa timbers. Analysis of cellulose weight average molecular weight by size exclusion chromatography was performed, as well as quantification of oxalic acid and iron by high-performance anion exchange chromatography and atomic emission spectroscopy, respectively. It was found that a decrease in iron content coincides with an increase in oxalic acid concentration and a drop in pH at a certain depth from the wood surface. When iron-rich surface wood samples from the Vasa were mixed with an aqueous solution of oxalic acid, a fast increase of pH over time was observed. Neither interior wood poor in iron nor the fresh oak reference showed the same neutralizing effect during the time of measurement. This indicates that the presence of iron (rust) causes a neutralization of the wood, through the formation of iron(III) oxalato complexes, thus protecting the wood from oxalic acid hydrolysis. This effect was not observed to the same extent for other acids observed in Vasa wood (sulfuric, formic, glycolic, and acetic acids).

  • 13.
    Garg, Neeraj
    Uppsala University, Sweden.
    Chemoselective Probe Containing a Unique Bioorthogonal Cleavage Site for Investigation of Gut Microbiota Metabolism2018In: Angewandte Chemie, ISSN n2:1433-7851, Vol. 57, no 42, p. 13805-13809Article in journal (Refereed)
  • 14.
    Garg, Neeraj
    Uppsala University, Sweden.
    Highly Sensitive MassSpectrometric Analysis of Metabolic Ketones and Aldehydes in Human FecalSamples2019In: Chemical Communications, ISSN 1359-7345, Vol. 55, no 62, p. 9080-9083Article in journal (Refereed)
  • 15.
    Garg, Neeraj
    Uppsala University, Sweden.
    New enzymatic and massspectrometric methodology for the selective investigation of gutmicrobiota-derived metabolites2018In: Chem. Sci., ISSN 2456-706X, Vol. 9, no 29, p. 6233-6239Article in journal (Refereed)
  • 16.
    Garg, Neeraj
    Uppsala University, Sweden.
    Structural elucidation of major selective androgen receptor modulator (SARM) metabolites for doping control2018In: Org. Biomol. Chem., Vol. 29, p. 698-702, article id 10.1039/C7OB03030DArticle in journal (Other academic)
  • 17. Gebremeskel, G.G.
    et al.
    Aldaeus, F.
    RISE, Innventia.
    Determination of lignin content in kraft black liquors by capillary zone electrophoresis (CZE)2013In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, no 8, p. 887-890Article in journal (Refereed)
  • 18.
    Gellerstedt, G.
    et al.
    RISE, Innventia.
    Tomani, P.
    RISE, Innventia.
    Axegård, P.
    RISE, Innventia.
    Backlund, B.
    RISE, Innventia.
    Lignin recovery and lignin-based products2013In: Green Chemistry, ISSN 1463-9262, E-ISSN 1463-9270, p. 180-210Article in journal (Refereed)
  • 19. Hua, K.
    et al.
    Carlsson, D.O.
    Ålander, E.
    RISE, Innventia.
    Lindström, T.
    RISE, Innventia.
    Strömme, M.
    Mihranyan, A.
    Ferraz, N.
    Translational study between structure and biological response of nanocellulose from wood and green algae2014In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 4, no 6, p. 2892-2903Article in journal (Refereed)
  • 20. Håkansson, K.M.O.
    et al.
    Fall, A.B.
    Lundell, F.
    Yu, S.
    Krywka, C.
    Roth, S.V.
    Santoro, G.
    Kvick, M.
    Prahl Wittberg, L.
    Soderberg, L.D.
    RISE, Innventia.
    Hydrodynamic alignment and assembly of nanofibrils resulting in strong cellulose filaments2014In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 5, article id 4018Article in journal (Refereed)
  • 21.
    Jacobs, Anna
    et al.
    RISE, Innventia. RISE - Research Institutes of Sweden.
    Aldaeus, Fredrik
    RISE, Innventia.
    Lignin and hemicellulose characterization for the biorefinery2014Conference paper (Refereed)
  • 22.
    Jacobs, Anna
    et al.
    RISE, Innventia.
    Aldaeus, Fredrik
    RISE, Innventia.
    Chedid, Fadia
    RISE, Innventia.
    Molecular mass distribution of lignin from black liquor: methods comparison2014Conference paper (Refereed)
  • 23. Johansson, E.
    et al.
    Malik, A.H.
    Hussain, A.
    Rasheed, F.
    Newson, W.R.
    Plivelic, T.
    Hedenqvist, M.S.
    Gällstedt, M.
    RISE, Innventia.
    Kuktaite, R.
    Wheat gluten polymer structures: The impact of genotype environment and processing on their functionality in various applications2013In: Cereal Chemistry, ISSN 0009-0352, E-ISSN 1943-3638, no 4, p. 367-376Article in journal (Refereed)
  • 24. Junka, K.
    et al.
    Filpponen, I.
    Lindström, T.
    RISE, Innventia.
    Laine, J.
    Titrimetric methods for the determination of surface and total charge of functionalized nanofibrillated/microfibrillated cellulose (NFC/MFC)2013In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, no 6, p. 2887-2895Article in journal (Refereed)
  • 25.
    Krochak, Paul
    et al.
    RISE, Innventia.
    Holm, Rickard
    RISE, Innventia.
    Söderberg, Daniel
    RISE, Innventia.
    Drag reduction characteristics of micro-fibrillated cellulose suspensions2011Conference paper (Refereed)
  • 26.
    Kulasinski, Karol
    et al.
    ETH Zurich, Switzerland; Empa Swiss Federal Laboratories for Materials Science and Technology, Switzerland.
    Salmén, Lennart
    RISE, Innventia.
    Derome, Dominique
    Empa Swiss Federal Laboratories for Materials Science and Technology, Switzerland.
    Carmeliet, Jan
    ETH Zurich, Switzerland; Empa Swiss Federal Laboratories for Materials Science and Technology, Switzerland.
    Moisture adsorption of glucomannan and xylan hemicelluloses2016In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 23, no 3, p. 1629-1637Article in journal (Refereed)
    Abstract [en]

    Wood and wood materials are highly sensitive to moisture in the environment. To a large extent this relates to the hygroscopicity of wood hemicelluloses. In order to increase our understanding of the effects of moisture sorption of the major wood hemicelluloses, glucomannan and xylan, model experiments using films of amorphous konjak glucomannan and rye arabinoxylan were conducted. Moisture-induced expansion and stiffness softening were characterized using dynamic mechanical testing. Both hemicelluloses showed a threshold around 5 % of moisture content above which swelling increased whereas the modulus decreased by more than 70 %. FTIR spectra, using H2O and D2O, indicated that even at high RH about 15 % of the hydroxyl groups were not accessible to hydrogen exchange by D2O. For xylan both hydroxyl groups were found to exchange in the same manner while for the glucomannan the O(6)H group seemed to be the most accessible.

  • 27.
    Larsson, Per Tomas
    RISE, Innventia.
    Solid state NMR as a tool for measuring pore sizes in water swollen cellulose fibre walls2013Conference paper (Refereed)
  • 28.
    Larsson, Per Tomas
    et al.
    RISE, Innventia.
    Svensson, Anna
    Wågberg, Lars
    Solid state NMR as a tool for measuring pore sizes in water swollen cellulose fibre walls2012Conference paper (Refereed)
  • 29.
    Lee, Taegyo
    et al.
    University of California, US.
    Wilson, Tyler W.
    University of California, US.
    Berg, Robert
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Process Development, Katalys.
    Ryberg, Per
    RISE, SP – Sveriges Tekniska Forskningsinstitut.
    Hartwig, John F.
    University of California, US.
    Rhodium-Catalyzed Enantioselective Silylation of Arene C–H Bonds: Desymmetrization of Diarylmethanols2015In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 137, no 21, p. 6742-6745Article in journal (Refereed)
    Abstract [en]

    We report a Rh-catalyzed, enantioselective silylation of arene C–H bonds directed by a (hydrido)silyl group. (Hydrido)silyl ethers that are formed in situ by hydrosilylation of benzophenone or its derivatives undergo asymmetric C–H silylation in high yield with excellent enantioselectivity in the presence of [Rh(cod)Cl]2 and a chiral bisphosphine ligand. The stereoselectivity of this process also allows enantioenriched diarylmethanols to react with site selectivity at one aryl group over the other. Enantioenriched benzoxasiloles from the silylation process undergo a range of transformations to form C–C, C–O, C–I, or C–Br bonds.

  • 30.
    Lindfors, Eva-Lisa
    et al.
    RISE, STFI-Packforsk.
    Lindström, Mikael
    RISE, STFI-Packforsk.
    Iversen, Tommy
    RISE, STFI-Packforsk.
    Polysaccharide degradation in waterlogged oak wood from the ancient warship Vasa2008In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 62, no 1, p. 57-63Article in journal (Refereed)
    Abstract [en]

    A rather extensive degradation of cellulose and hemicelluloses was found in waterlogged oak wood samples from the ancient warship Vasa by size exclusion chromatography with the solvent system lithium chloride/N,N-dimethylacetamide (LiCl/DMAc). The degradation has mainly occurred after salvage of the wreck, probably as a consequence of keeping iron contaminated wood in contact with air. The most likely explanation is Fenton type of reactions degrading the wood polymers and oxidising reduced sulphur forms to sulphuric acid. An increased degradation rate of the Vasa wood can be anticipated in the future if the sulphuric acid cannot be neutralised and the oxidative reactions cannot be quenched.

  • 31.
    Lindh, Erik L.
    et al.
    RISE, Innventia. KTH Royal Institute of Technology, Sweden.
    Bergenstråhle-Wohlert, Malin
    RISE, Innventia. KTH Royal Institute of Technology, Sweden.
    Terenzi, Camilla
    KTH Royal Institute of Technology, Sweden.
    Salmen, Lennart
    RISE, Innventia. KTH Royal Institute of Technology, Sweden.
    Furo, István
    KTH Royal Institute of Technology, Sweden.
    Non-exchanging hydroxyl groups on the surface of cellulose fibrils: The role of interaction with water2016In: Carbohydrate Research, ISSN 0008-6215, E-ISSN 1873-426X, Vol. 434, p. 136-142Article in journal (Refereed)
    Abstract [en]

    The interaction of water with cellulose stages many unresolved questions. Here 2H MAS NMR and IR spectra recorded under carefully selected conditions in 1H-2H exchanged, and re-exchanged, cellulose samples are presented. It is shown here, by a quantitative and robust approach, that only two of the three available hydroxyl groups on the surface of cellulose fibrils are exchanging their hydrogen with the surrounding water molecules. This finding is additionally verified and explained by MD simulations which demonstrate that the 1HO(2) and 1HO(6) hydroxyl groups of the constituting glucose units act as hydrogen-bond donors to water, while the 1HO(3) groups behave exclusively as hydrogen-bond acceptors from water and donate hydrogen to their intra-chain neighbors O(5). We conclude that such a behavior makes the latter hydroxyl group unreactive to hydrogen exchange with water.

  • 32.
    Moodie, Lindon W. K.
    et al.
    UiT The Arctic University of Norway, Norway.
    Žužek, Monika C.
    University of Ljubljana, Slovenia.
    Frangež, Robert
    University of Ljubljana, Slovenia.
    Andersen, Jeanette H.
    UiT The Arctic University of Norway, Norway.
    Hansen, Espen
    UiT The Arctic University of Norway, Norway.
    Olsen, Elisabeth K.
    UiT The Arctic University of Norway, Norway.
    Cergolj, Marija
    University of Ljubljana, Slovenia; University of Rijeka, Croatia.
    Sepčić, Kristina
    University of Ljubljana, Slovenia.
    Hansen, Kine Ø
    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.
    Synthetic analogs of stryphnusin isolated from the marine sponge: Stryphnus fortis inhibit acetylcholinesterase with no effect on muscle function or neuromuscular transmission2016In: Organic and biomolecular chemistry, ISSN 1477-0520, E-ISSN 1477-0539, Vol. 14, no 47, p. 11220-11229Article in journal (Refereed)
    Abstract [en]

    The marine secondary metabolite stryphnusin (1) was isolated from the boreal sponge Stryphnus fortis, collected off the Norwegian coast. Given its resemblance to other natural acetylcholinesterase antagonists, it was evaluated against electric eel acetylcholinesterase and displayed inhibitory activity. A library of twelve synthetic phenethylamine analogs, 2a-7a and 2b-7b, containing tertiary and quaternary amines respectively were synthesized to investigate the individual structural contributions to the activity. Compound 7b was the strongest competitive inhibitor of both acetylcholinesterase and butyrylcholinesterase with IC50 values of 57 and 20 μM, respectively. This inhibitory activity is one order of magnitude higher than the positive control physostigmine, and is comparable with several other marine acetylcholinesterase inhibitors. The physiological effect of compound 7b on muscle function and neuromuscular transmission was studied and revealed a selective mode of action at the investigated concentration. This data is of importance as the interference of therapeutic acetylcholinesterase inhibitors with neuromuscular transmission can be problematic and lead to unwanted side effects. The current findings also provide additional insights into the structure-activity relationship of both natural and synthetic acetylcholinesterase inhibitors.

  • 33.
    Nilsson, Helena
    et al.
    RISE, STFI-Packforsk.
    Olsson, Ann
    RISE, STFI-Packforsk.
    Lindström, Mikael
    RISE, STFI-Packforsk.
    Iversen, Tommy
    RISE, STFI-Packforsk.
    Birch bark as a source for fine chemicals2008In: 2008 Nordic Wood Biorefinery Conference - Proceedings: NWBC 2008, 2008, Vol. 274, no 1, p. 125-128Conference paper (Refereed)
    Abstract [en]

    In this study we report polycondensation and co-polymerization of cis-9,10-epoxy-18-hydroxyoctadecanoic acid (1) isolated from birch outer bark using immobilized Candida antarctica lipase B (Novozyme 435) as catalyst to give epoxy activated straight chain polyesters and cyclic macromonomers.

  • 34.
    Olsen, Elisabeth K.
    et al.
    UiT The Arctic University of Norway, Norway.
    Hansen, Espen
    UiT The Arctic University of Norway, Norway.
    Moodie, Lindon W. K.
    University of Umeå, Sweden.
    Isaksson, Johan
    UiT The Arctic University of Norway, Norway.
    Sepčić, Kristina
    University of Ljubljana, Slovenia.
    Cergolj, Marija
    University of Ljubljana, Slovenia; University of Rijeka, Croatia.
    Svenson, Johan
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Medicinteknik.
    Andersen, Jeanette H.
    UiT The Arctic University of Norway, Norway.
    Marine AChE inhibitors isolated from Geodia barretti: Natural compounds and their synthetic analogs2016In: Organic and biomolecular chemistry, ISSN 1477-0520, E-ISSN 1477-0539, Vol. 14, no 5, p. 1629-1640Article in journal (Refereed)
    Abstract [en]

    Barettin, 8,9-dihydrobarettin, bromoconicamin and a novel brominated marine indole were isolated from the boreal sponge Geodia barretti collected off the Norwegian coast. The compounds were evaluated as inhibitors of electric eel acetylcholinesterase. Barettin and 8,9-dihydrobarettin displayed significant inhibition of the enzyme, with inhibition constants (Ki) of 29 and 19 μM respectively towards acetylcholinesterase via a reversible noncompetitive mechanism. These activities are comparable to those of several other natural acetylcholinesterase inhibitors of marine origin. Bromoconicamin was less potent against acetylcholinesterase, and the novel compound was inactive. Based on the inhibitory activity, a library of 22 simplified synthetic analogs was designed and prepared to probe the role of the brominated indole, common to all the isolated compounds. From the structure-activity investigation it was shown that the brominated indole motif is not sufficient to generate a high acetylcholinesterase inhibitory activity, even when combined with natural cationic ligands for the acetylcholinesterase active site. The four natural compounds were also analysed for their butyrylcholinesterase inhibitory activity in addition and shown to display comparable activities. The study illustrates how both barettin and 8,9-dihydrobarettin display additional bioactivities which may help to explain their biological role in the producing organism. The findings also provide new insights into the structure-activity relationship of both natural and synthetic acetylcholinesterase inhibitors.

  • 35. Penttilä, P.A.
    et al.
    Varnai, A.
    Pere, J.
    Tammelin, T.
    Salmen, L.
    RISE, Innventia.
    Siika-aho, M.
    Viikari, L.
    Serimaa, R.
    Xylan as limiting factor in enzymatic hydrolysis of nanocellulose2013In: Bioresource Technology, ISSN 0960-8524, E-ISSN 1873-2976, p. 135-141Article in journal (Refereed)
  • 36. Persson, J.
    et al.
    Dahlman, O.
    RISE, Innventia.
    Albertsson, A.-C.
    Birch xylan grafted with pla branches of predictable length2012In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, no 3, p. 3640-3655Article in journal (Refereed)
  • 37. Persson, J.
    et al.
    Dahlman, O.
    Albertsson, A.-C.
    Edlund, U.
    Modification of birch xylan by lactide-grafting2012In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, no 3, p. 518-524Article in journal (Refereed)
  • 38. Rezayati Charani, P.
    et al.
    Dehghani-Firouzabadi, M.
    Afra, E.
    Blademo, Åsa
    RISE, Innventia.
    Naderi, Ali
    RISE, Innventia.
    Lindström, Tom
    RISE, Innventia.
    Production of microfibrillated cellulose from unbleached kraft pulp of Kenaf and Scotch Pine and its effect on the properties of hardwood kraft:: Microfibrillated cellulose paper2013In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, no 5, p. 2559-2567Article in journal (Refereed)
  • 39.
    Safdari, Majid
    et al.
    KTH Royal Institute of Technology, Sweden .
    Phuyal, Dibya
    Uppsala University, Sweden.
    Philippe, Bertrand
    Uppsala University, Sweden.
    Svensson, Per H
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation. KTH Royal Institute of Technology, Sweden .
    Butorin, Sergei M
    Uppsala University, Sweden.
    Kvashnina, Kristina O
    ESRF The European Synchrotron, France; Institute of Resource Ecology, Germany.
    Rensmo, Håkan
    Uppsala University, Sweden.
    Kloo, Lars
    KTH Royal Institute of Technology, Sweden .
    Gardner, James M
    KTH Royal Institute of Technology, Sweden .
    Impact of synthetic routes on the structural and physical properties of butyl-1,4-diammonium lead iodide semiconductors2017In: Journals of materials chemistry A, Vol. 5, no 23, p. 11730-11738Article in journal (Refereed)
    Abstract [en]

    We report the significant role of synthetic routes and the importance of     solvents in the synthesis of org.-inorg. lead iodide materials.  Through     one route, the intercalation of DMF in the crystal structure was obsd.     leading to a one--dimensional (1D) [NH3(CH2)4NH3]Pb2I6 structure of the     product.  This product was compared with the two-dimensional (2D)     [NH3(CH2)4NH3]PbI4 recovered from aq. solvent based synthesis with the     same precursors.  UV-visible absorption spectroscopy showed a red-shift of     0.1 eV for the band gap of the 1D network in relation to the 2D system.     This shift primarily originates from a shift in the valence band edge as     detd. from photoelectron- and X-ray spectroscopy results.  These findings     also suggest the iodide 5p orbital as the principal component in the d. of     states in the valence band edge.  Single crystal data show a change in the     local coordination around iodide, while in both materials, lead atoms are     surrounded by iodide atoms in octahedral units.  The cond. of the     one-dimensional material ([NH3(CH2)4NH3]Pb2I6) was 50% of the     two-dimensional material ([NH3(CH2)4NH3]PbI4).  The fabricated solar cells     reflect these changes in the chem. and electronic structure of both     materials, although the total light conversion efficiencies of solar cells based on both products were similar.

  • 40.
    Salmen, Lennart
    et al.
    RISE, STFI-Packforsk.
    Possler, H.
    Stevanic, Jasna S.
    RISE, STFI-Packforsk.
    Stanzl-Tschegg, S. E.
    Analysis of thermally treated wood samples using dynamic FT-IR-spectroscopy2008In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 62, no 6, p. 676-678Article in journal (Refereed)
  • 41. Simonovic, J.
    et al.
    Stevanic, J.
    RISE, Innventia.
    Djikanovic, D.
    Salmen, L.
    RISE, Innventia.
    Radotic, K.
    Anisotropy of cell wall polymers in branches of hardwood and softwood: A polarized FTIR study2011In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, no 6, p. 1433-1440Article in journal (Refereed)
  • 42.
    Sjöholm, Elisabeth
    et al.
    RISE, Innventia.
    Aldaeus, Fredrik
    RISE, Innventia.
    Reimann, Anders
    RISE, Innventia.
    Ropponen, Jarmo
    Talja, Riku
    Determination of fundamental thermal characteristics of lignin: a comparative study2014Conference paper (Refereed)
  • 43.
    Stevanic, Jasna S.
    et al.
    RISE, STFI-Packforsk.
    Salmen, Lennart
    RISE, STFI-Packforsk.
    Interactions among components in the primary cell wall of Norway spruce (Picea Abies (L.) Karst.): Effect of a low sulphonation pretreatment2008In: Journal of Pulp and Paper Science (JPPS), ISSN 0826-6220, Vol. 34, no 2, p. 107-112Article in journal (Refereed)
    Abstract [en]

    Dynamic Fourier Transform Infra-Red (FT-IR) spectroscopy was used to examine the effect of a low sulphonation treatment on the ultrastructure of the primary cell wall of spruce wood. Sheets made from enriched primary cell wall material coming from a low sulphonated thermomechanical pulp were used for studying the viscoelastic response of the polymers using dynamic FT-IR spectroscopy. The overall ultrastructure of the primary cell wall remained largely unaltered, due to the exceptionally low degree of sulphonation used. However, an increased softening of the material as well as a weakening of the lignin;pectin, lignin;protein and pectin;protein interactions were observed. The suggestion is that, together with a structural modification of the lignin, it is the increased viscoelasticity of the material, resulting from the breaking down of the interactions among the polymers, that is the cause for the lower energy demand, when refining correspondingly low sulphonated chips.

  • 44.
    Stevanic, Jasna S.
    et al.
    RISE, STFI-Packforsk.
    Salmen, Lennart
    RISE, STFI-Packforsk.
    Orientation of the wood polymers in the cell wall of spruce wood fibres2009In: Holzforschung, ISSN 0018-3830, E-ISSN 1437-434X, Vol. 63, no 5, p. 497-503Article in journal (Refereed)
    Abstract [en]

    The mechanical and physical properties of wood fibres depend to a large extent on the orientation of the polymers, mainly the cellulose microfibrils, within the supramolecular structure of the cell wall. Under moist conditions, the arrangement within the polymer matrix may play a dominant role for mechanical properties in general and, especially, in the transverse direction. In this context, it is of special interest to determine the orientation of glucomannan and xylan, being the essential components of softwood hemicelluloses, and of lignin in wood fibres. Fourier transform infrared (FTIR) microscopy was used to examine the orientation of the main wood polymers in transversal and longitudinal direction of spruce fibres. We investigated fibres made from a thermomechanical pulp, in which the outer fibre wall layers were removed by mechanical action, and chemically delignified fibres. The polarised FTIR measurements indicated that glucomannan and xylan appear to have a parallel orientation with regard to the orientation of cellulose and, in all probability, an almost parallel orientation with regard to the fibre axis. Lignin was found to be less oriented in the fibre wall, although its arrangement is not fully isotropic. In the longitudinal direction of the fibres, there were no significant changes in the molecular orientation of the studied polymers.

  • 45.
    Söderberg, D.
    RISE, Innventia.
    Fluid dynamic challenges of future nano cellulose fiber processes2011Conference paper (Refereed)
  • 46. Tanpichai, S.
    et al.
    Quero, F.
    Nogi, M.
    Yano, H.
    Young, R.J.
    Lindström, T.
    RISE, Innventia.
    Sampson, W.W.
    Eichhorn, S.J.
    Effective young's modulus of bacterial and microfibrillated cellulose fibrils in fibrous networks2012In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, no 5, p. 1340-1349Article in journal (Refereed)
  • 47. Zhu, H.
    et al.
    Helander, M.
    RISE, Innventia.
    Moser, C.
    Ståhlkranz, A.
    Söderberg, D.
    RISE, Innventia.
    Henriksson, G.
    Lindström, M.
    RISE, Innventia.
    A novel nano cellulose preparation method and size fraction by cross flow ultra- filtration2012In: Current organic chemistry, ISSN 1385-2728, E-ISSN 1875-5348, no 16, p. 1871-1875Article in journal (Refereed)
  • 48.
    Öyaas, K.
    et al.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Johnsen, I.A.
    Hoff, B.H.
    Opedal, Mihaela Tanase
    Toven, K.
    RISE, Innventia, PFI – Paper and Fiber Research Institute.
    Gulbrandsen, T.Aa.
    Hot water extraction of hemicellulose from softwood and sugarcane bagasse using microwave heating technology2012Conference paper (Refereed)
1 - 48 of 48
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