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  • 1.
    Cheregi, O.
    et al.
    University of Gothenburg, Sweden.
    Ekendahl, Susanne
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Engelbrektsson, Johan
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Strömberg, Niklas
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Godhe, A.
    University of Gothenburg, Sweden.
    Spetea, C.
    University of Gothenburg, Sweden.
    Microalgae biotechnology in Nordic countries – the potential of local strains2019In: Physiologia Plantarum: An International Journal for Plant Biology, ISSN 0031-9317, E-ISSN 1399-3054, Vol. 166, no 1, p. 438-450Article in journal (Refereed)
    Abstract [en]

    Climate change, energy use and food security are the main challenges that our society is facing nowadays. Biofuels and feedstock from microalgae can be part of the solution if high and continuous production is to be ensured. This could be attained in year-round, low cost, outdoor cultivation systems using strains that are not only champion producers of desired compounds but also have robust growth in a dynamic climate. Using microalgae strains adapted to the local conditions may be advantageous particularly in Nordic countries. Here, we review the current status of laboratory and outdoor-scale cultivation in Nordic conditions of local strains for biofuel, high-value compounds and water remediation. Strains suitable for biotechnological purposes were identified from the large and diverse pool represented by saline (NE Atlantic Ocean), brackish (Baltic Sea) and fresh water (lakes and rivers) sources. Energy-efficient annual rotation for cultivation of strains well adapted to Nordic climate has the potential to provide high biomass yields for biotechnological purposes

  • 2.
    Ekendahl, Susanne
    et al.
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Bark, Mathias
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Engelbrektsson, Johan
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Karlsson, Carl-Anton
    Nordic Paper Bäckhammars Bruk AB, Sweden.
    Niyitegeka, Domitille
    Nordic Paper Bäckhammars Bruk AB, Sweden.
    Strömberg, Niklas
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Energy-efficient outdoor cultivation of oleaginous microalgae at northern latitudes using waste heat and flue gas from a pulp and paper mill2018In: Algal Research, ISSN 2211-9264, Vol. 31, p. 138-146Article in journal (Refereed)
    Abstract [en]

    Energy efficient cultivation is the major bottleneck for microalgal biomass production on a large scale and considered very difficult to attain at northern latitudes. In this study an unconventional method for industrial microalgae cultivation for bio-oil production using pulp and paper mill waste resources while harvesting only once a year was performed, mainly in order to investigate the energy efficiency of the process. Algae were cultivated for three months in 2014 in covered pond systems with access to flue gas and waste heat from the industry, and the biomass was recovered as thick sediment sludge after dewatering. The cultivation systems, designed to manage the waste resources, reached a promising photosynthetic efficiency of at most 1.1%, a net energy ratio (NER) of 0.25, and a projected year-round energy biomass yield per area 5.2 times higher than corresponding rapeseed production at the location. Thus, microalgae cultivation was, for the first time, proven energy efficient in a cold continental climate. Energy-rich indigenous communities quickly out-competed the oleaginous monocultures used for inoculation. The recovered biomass had higher heating values of 20–23 MJ kg− 1 and contained 14–19% oil dominated by C16 followed by C18 fatty acids. The cultivation season at 59°15′N, 14°18′E was projected to be efficient for 10 months and waste heat drying of the biomass is suggested for two winter months. The technique is proposed for carbon sequestering and energy storage in the form of microalgal sludge or dry matter for later conversion into biochemicals.

  • 3.
    Ekendahl, Susanne
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Kemi Material och Ytor, Polymer och fiber.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Haglund, Jonas
    Lauritzen, Andreas
    Persson, Magnus
    Sandberg, Maria
    Svanberg, Johanna
    Svensen, Tarjei
    Tervell, Nils
    Wernvall, Svante
    Wiklund, Per
    Pettersson, Christer
    Algodling hos massa- och pappersbruk för hållbar produktion av biobränsle – en förstudie2012Report (Refereed)
  • 4.
    Hakonen, Aron
    et al.
    Sensor Visions AB, Sweden.
    Strömberg, Niklas
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Fluorescence and naked-eye detection of Pb2+ in drinkingwater using a low-cost ionophore based sensing scheme2018In: Chemosensors, ISSN 2227-9040, Vol. 6, no 4, article id 51Article in journal (Refereed)
    Abstract [en]

    Drinking water contamination of lead from various environmental sources, leaching consumer products, and intrinsic water-pipe infrastructure is still today a matter of great concern. Therefore, new highly sensitive and convenient Pb2+ measurement schemes are necessary, especially for in-situ measurements at a low cost. Within this work dye/ionophore/Pb2+ co-extraction and effective water phase de-colorization was utilized for highly sensitive lead measurements and sub-ppb naked-eye detection. A low-cost ionophore Benzo-18-Crown-6-ether was used, and a simple test-tube mix and separate procedure was developed. Instrumental detection limits were in the low ppt region (LOD = 3, LOQ = 10), and naked-eye detection was 500 ppt. Note, however, that this sensing scheme still has improvement potential as concentrations of fluorophore and ionophore were not optimized. Artificial tap-water samples, leached by a standardized method, demonstrated drinking water application. Implications for this method are convenient in-situ lead ion measurements.

  • 5. Lindh, L
    et al.
    Glantz, P-O
    Strömberg, Niklas
    Arnebrant, T
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, YKI – Ytkemiska institutet.
    On the adsorption of human acidic proline-rich proteins (PRP-1 and PRP-3) and statherin at solid/liquid interfaces2002In: Biofouling (Print), ISSN 0892-7014, E-ISSN 1029-2454, Vol. 18, p. 87-94Article in journal (Refereed)
  • 6.
    Moen, Ingrid
    et al.
    Oxy Solutions AS, Norway.
    Ugland, Hege
    Oxy Solutions AS, Norway.
    Strömberg, Niklas
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Sjöström, Eva
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Karlsson, Anders
    RISE - Research Institutes of Sweden, Bioscience and Materials, Chemistry and Materials.
    Ringstad, Lovisa
    RISE - Research Institutes of Sweden, Bioscience and Materials, Surface, Process and Formulation.
    Bysell, Helena
    RISE - Research Institutes of Sweden.
    Amiry‐Moghaddam, Mahmood
    Oxy Solutions AS, Norway ; University of Oslo, Norway.
    Hagleröd, Camilla
    Oxy Solutions AS, Norway.
    Development of a novel in situ gelling skin dressing: Deliveringhigh levels of dissolved oxygen at pH 5.52018In: Health Sci Rep., article id e57Article in journal (Refereed)
    Abstract [en]

    Background and aims: Wound healing requires appropriate oxygen and pH levels.Oxygen therapy and pH‐modulating treatments have shown positive effects onwound healing. Thus, a dressing, which combines high levels of dissolved oxygen(DO) with the pH of intact skin, may improve wound healing. Our aims were to (1) formulatean in situ gelling dressing with high levels of DO and with the pH level of intactskin, (2) evaluate physical and chemical properties of the dressing, and (3) elucidatebasic effects of elevated levels of DO on human skin cells in vitro.Methods: A dressing was formulated with 15 to 16 wt% poloxamer 407, acetatebuffer, and oxygenated water. Stability of pH and DO, rheology, and shelf life wereanalysed. Furthermore, in vitro studies of the effect of increased levels of DO wereperformed.Results: An in situ gelling wound dressing, with a DO concentration rangingbetween 25 and 35 mg/L and a pH of 5.5, was formulated. The DO concentrationwas stable above 22 mg/L for at least 30 hours when applied on a surface at 35°Cand covered for directed diffusion into the intended wound area. At storage, thedressing had stable pH for 3 months and stable DO concentration over 30 mg/L for7 weeks. Increasing DO significantly enhanced intracellular ATP in human skin cells,without changing reactive oxygen species production, proliferation rate, or viability.Conclusion: The developed dressing may facilitate wound healing by deliveringcontrolled and stable oxygen levels, providing adjustable pH for optimized healing,and increasing intracellular ATP availability.

  • 7.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Biodiesel degradation rate after refueling2013In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 105, no Mar, p. 301-305Article in journal (Refereed)
  • 8.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Diffusion consistent calibrations for improved chemical imaging using nanoparticle enhanced optical sensors2012In: The Analyst, ISSN 0003-2654, E-ISSN 1364-5528, Vol. 137, no 2, p. 315-321Article in journal (Refereed)
  • 9.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Digital colour tone for fluorescence sensing: A direct comparison of intensity, ratiometric and hue based quantification2014In: The Analyst, ISSN 0003-2654, E-ISSN 1364-5528, Vol. 139, no 14, p. 3524-3527Article in journal (Refereed)
    Abstract [en]

    The hue parameter of HSV colour-space for digital imaging is shown to be accessible for convenient quantitative fluorescence imaging. A commercially available pH probe was utilized in solution and incorporated into optical μ-sensors for microscopy applications.

  • 10.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Imaging-optode measurements of ammonium distribution in soil after different manure amendments2011In: European Journal of Soil Science, ISSN 1351-0754, E-ISSN 1365-2389, Vol. 62, no 2, p. 295-304Article in journal (Refereed)
  • 11.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Plasmonic nanoparticle interactions for high-performance imaging fluorosensors2011In: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 47, no 12, p. 3433-3435Article in journal (Refereed)
  • 12.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Plasmophore sensitized imaging of ammonia release from biological tissues using optodes2011In: Analytica Chimica Acta, ISSN 0003-2670, E-ISSN 1873-4324, Vol. 704, no 1-2, p. 139-145Article in journal (Refereed)
  • 13.
    Strömberg, Niklas
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Ruthenium(II) complex enantiomers as cellular probes for diastereomeric interactions in confocal and fluorescence lifetime imaging microscopy2011In: Journal of Physical Chemistry Letters, ISSN 1948-7185, E-ISSN 1948-7185, Vol. 2, no 5, p. 397-401Article in journal (Refereed)
  • 14.
    Strömberg, Niklas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Eriksson, H.
    Scania, Sweden.
    Saramat, A.
    Scania, Sweden.
    Determination of phase separation efficiency for biodiesel quality and blending2014In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 117, no pt A, p. 74-78Article in journal (Refereed)
    Abstract [en]

    In this study we reintroduce phase separation efficiency as an important characteristic for biodiesel quality and blending. The ability of the fuel to emulsify water is possibly one of the most important features behind biological and chemical fuel degradation but yet, no methods that directly measure this property are included in the standard biodiesel regulation EN14214. The proposed simple technique for fuel quality testing is based on the time it takes for ultra-purified water to become transparent after complete mixing with an equal volume of fuel, measured by kinetic absorbance spectrophotometry. In this study we screen the phase separation efficiency (measured as separation time) of purified, un-aged and aged Fatty Acid Methyl Esters (FAME/B100) and its blends with EN590 with 7% FAME without detergents (B7 reference fuel Euro VI Part no 546061-35 and B100) as well as for FAME blends with a commercial EN590. The B7 fuel was used as reference in all measurements. Aged biodiesel (FAME/B100) almost doubled (1.8 times) its separation time compared to the un-aged FAME/B100 sample and had almost three times (2.9) longer phase separationtime relative the reference B7 fuel. Also fuel blends showed long separation times. A fuel blend based on aged FAME/B100 blended with B7 to a corresponding B30 (30% FAME) gave after three consecutive 10 s mixings stable emulsions (>30 min) in two out of three replicates. All fuels blended with commercial EN590 showed excellent phase separation efficiencies with significantly shorter separation times than FAME/B100. We also show that the phase separation efficiency of the B30 blend could be improved after the rape seed ester was vacuum distilled before blending with B7 petrodiesel. The results indicate that likely emulsion problems associated with the B30 blends can be circumvented with proper selection of compatible petroleum components as well as FAME purifications.

  • 15.
    Strömberg, Niklas
    et al.
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Sahlin, Eskil
    RISE, SP – Sveriges Tekniska Forskningsinstitut, SP Sveriges tekniska forskningsinstitut, SP – Sveriges Tekniska Forskningsinstitut / Oorganisk kemi (Kmoo).
    Determination of the short-chain fatty acid pattern in biodiesel using high throughput syringe solvent extraction and ion exclusion chromatography2012In: Fuel, ISSN 0016-2361, E-ISSN 1873-7153, Vol. 97, p. 531-535Article in journal (Refereed)
1 - 15 of 15
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