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  • 1.
    Allard, Bert
    et al.
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Black shale: a biogeochemical archive2014In: Sedimentary Pore Space Cementation: Role of Microbes / [ed] Kothe E, Büchel G, 2014, p. 6-Conference paper (Refereed)
  • 2. Grandin, Anna
    et al.
    Ogar, Anna
    Institute of Environmental Science, Jagiellonian University, Krakow, Poland.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Potential use of native fungal strains for assisted uranium retention2015In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 81, p. 173-178Article in journal (Refereed)
    Abstract [en]

    Uranium-stabilizing ligands can be useful complexing agents for uranium in aqueous solution. The discovery of novel ligand candidates for selective uranium capture in artificial and natural waters could provide scope for their use in water remediation and metal recovery from low- and high grade ores. In this study we used seven fungal strains, isolated from shale waste, to monitor the uranium retention capacity from an aqueous solution. After four weeks of incubation, suspensions containing the fungal strains were filtered, and up to 100% of the total uranium inventory was removed from a 10 mg L-1 solution. Approximately 70% of the total uranium removal is attributed to complexation and/or adsorption by particles in the malt extract and some 10% is adsorbed by the fungal biomass. The additional 20% uranium removed could be related to the excretion of fungal metabolites. From 58% to 90% of the uranium is removed within ten minutes. The formation of colloidal/particulate uranium is proposed to be controlled by organic ligands in the culture medium and organic ligands excreted by the fungi where phosphorus moieties seem to be important. Membrane fouling by the hydrocarbons is also suggested to contribute to a loss of uranium from the aqueous phase.

  • 3.
    Grandin, Anna
    et al.
    Örebro University, School of Science and Technology.
    Ogar, Anna
    Jagiellonian University, Krakow, Poland. .
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Biosorption of uranium by fungi isolated from weathered alum shale residues2013In: / [ed] E. Kothe and G. Büchel, 2013Conference paper (Refereed)
  • 4.
    Grandin, Anna
    et al.
    Örebro University, School of Science and Technology.
    Ogar, Anna
    Jagellonian University, Krakow, Poland.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Uranium induced stress promotes fungal excretion of uranium/metal stabilizing ligands: Analysis of metal-organic compounds with Size Exclusion Chromatography and Inductively Coupled Plasma-Mass Spectroscopy2014In: Uranium - Past and Future Challenges: Proceedings of the 7th International Conference on Uranium Mining and Hydrogeology, Springer Publishing Company, 2014, p. 347-354Conference paper (Refereed)
  • 5.
    Grandin, Anna
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Mobilization of vanadium from LD slag by salt-roasting/alkaline heterotrophic leaching2011In: 25th International Applied Geochemistry Symposium, 22-26 August, 2011, Rovaniemi, Finland / [ed] Pertti Sarala, V. Juhani Ojala, Marja-Leena Porsanger, Vuorimiesyhdistys , 2011, p. 135-136Conference paper (Refereed)
  • 6.
    Grandin, Anna
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Stability of weathered shales at water field capacity in the presence of Aspen wood shavings2011In: Mine water: managing the challenges:  proceedings of the International Mine Water Association Congress 2011 / [ed] Trude R.Rüde, Antje Freund, Christian Wolkersdorfer, Aachen: RWTH , 2011, p. 331-335Conference paper (Refereed)
  • 7.
    Karlsson, Stefan
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Heterotrophic leaching of LD-slag: formation of organic ligands2011In: Mine Water: Managing the Challenges: proceedings of the International Mine Water Association Congress 2011 / [ed] Trude R.Rüde, Antje Freund, Christian Wolkersdorfer, Aachen: RWTH , 2011, p. 371-374Conference paper (Refereed)
  • 8.
    Karlsson, Stefan
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Revegetating acidic mine waste using UMBRELLA guidelines: The second summer2012In: 11 Symposium on remediation in Jena, "Jenaer Sanierungskolloquium": Geobiotechnology: from lost areas to resourcesConference Proceedings, 2012Conference paper (Refereed)
  • 9.
    Karlsson, Stefan
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Leaching pattern of metals from historic sulphidic mine waste upon addition of bark compost2013In: Annual International Mine Water Association Conference: Relialbe Mine Water Technology, Vol.1 / [ed] Brown, Adrian; Figueroa, Linda; Wolkersdorfer, Christian, IMWA & QuarkXPress , 2013, p. 625-632Conference paper (Refereed)
  • 10.
    Karlsson, Stefan
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Revegetation of historic acid mine waste with Agrostis capillaris: Impact on leachate composition in pot experiments2012In: International Mine Water Association Symposium / [ed] McCullough C D; Lund M A; Wyse L, Perth: IMWA & The Expo Group , 2012, p. 489-497Conference paper (Refereed)
  • 11.
    Karlsson, Stefan
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Revegetation of historic acidic mine waste with Agrostis capillaris: Remediation strategy2012In: International Mine Water Association Symposium / [ed] McCullough, C.D.; Lund, M.A. & Wyse, L., International Mine Water Association ( IMWA ) , 2012, p. 317-325Conference paper (Refereed)
    Abstract [en]

    To establish vegetation on historical acidicmine waste and metal polluted soil has several environmental, physical and chemical advantages on metalrelease. Pot experiments with material from the Ljusnarsbergs mine waste deposit in Sweden showed that different kinds of refuse can be used to sustain germination and improve growth of Agrostiscapillariswhere it otherwise isimpossible. Bark compost increased the water holding capacity and an increase of pHin the top 50 mm by addition of water works granules made it possible for the grass to survive. An even better growth was obtained if those systems were also inoculated with mycorrhiza.

  • 12.
    Karlsson, Stefan
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Substrate conditioning for growth of Agrostis capillaris on historical sulphidic mine waste: Impact on ARD composition2013Conference paper (Refereed)
  • 13.
    Karlsson, Stefan
    et al.
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Pourjabbar, Anahita
    Friedrich Schiller Univ., Jena, Germany.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Distribution of rare earth elements and other metals in a stratified acidic pit lake in black shales 45 years after mine closure2012In: 9th International Conference on Acid Rock Drainage  (ICARD 2012): Ottawa, Canada20-26 May 2012 / [ed] Price WA, Hogan C, Tremblay G, Curran Associates, Inc., 2012, p. 812-821Conference paper (Refereed)
  • 14.
    Ogar, Anna
    et al.
    Jagiellonian University, Krakow, Poland.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Sjöberg, Viktor
    Örebro University, School of Science and Technology.
    Turnau, Katarzyna
    Jagiellonian University, Krakow, Poland.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Stabilization of Uranium(VI) at Low pH by Fungal Metabolites: Applications in Environmental Biotechnology2014In: 5th International Conference on Environmental Science and Development - ICESD 2014, 2014, Vol. 10, p. 142-148Conference paper (Refereed)
    Abstract [en]

    Uranium contamination of soils and water is a worldwide problem due to geology or anthropogenic release such as mining, or use of inorganic fertilizers. In situ remediation of low and moderately contaminated sites is a complicated procedure due to the complex chemistry of uranium. This study demonstrates that at pH 3.5, a fungal strain isolated from unprocessed uranium bearing shale creates hydrochemical conditions that immobilize 97% of a total of 10 mg L-1 dissolved uranium in a 0.20 μm pore system. The redistribution occurred within 10 minutes and remained for five weeks and just 12% of the inventory was retrieved in the biomass. Size exclusion chromatography of the dissolved phase identified organic substances in the range of more than 60 kD down to 100 D as a response to time of incubation. Geochemical modeling indicates formation of uranium-organic complexes where ligand size, coordination chemistry and their tendency to agglomerate determine the redistribution.

  • 15.
    Rozpadek, Piotr
    et al.
    Institute of Environmental Sciences, Jagiellonian University, Kraków, Poland; Institute of Plant Physiology, Polish Academy of Sciences, Kraków, Poland.
    Rapala-Kozik, Maria
    Department of Comparative Biochemistry and Bioanalytics, Faculty of Biochemistry, Biophysics and Biotechnology, Jagiellonian University, Kraków, Poland.
    Wezowicz, Katarzyna
    Institute of Environmental Sciences, Jagiellonian University, Kraków, Poland.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Wazny, Rafal
    Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland.
    Anielska, Teresa
    Institute of Environmental Sciences, Jagiellonian University, Kraków, Poland.
    Turnau, Katarzyna
    Institute of Environmental Sciences, Jagiellonian University, Kraków, Poland; Malopolska Centre of Biotechnology, Jagiellonian University, Kraków, Poland.
    Arbuscular mycorrhiza improves yield and nutritional properties of onion (Allium cepa)2016In: Plant physiology and biochemistry (Paris), ISSN 0981-9428, E-ISSN 1873-2690, Vol. 107, p. 264-272Article in journal (Refereed)
    Abstract [en]

    Improving the nutritional value of commonly cultivated crops is one of the most pending problems for modern agriculture. In natural environments plants associate with a multitude of fungal microorganisms that improve plant fitness. The best described group are arbuscular mycorrhizal fungi (AMF). These fungi have been previously shown to improve the quality and yield of several common crops. In this study we tested the potential utilization of Rhizophagus irregularis in accelerating growth and increasing the content of important dietary phytochemicals in onion (Allium cepa). Our results clearly indicate that biomass production, the abundance of vitamin B1 and its analogs and organic acid concentration can be improved by inoculating the plant with AM fungi. We have shown that improved growth is accompanied with up-regulated electron transport in PSII and antioxidant enzyme activity.

  • 16.
    Sjöberg, Viktor
    et al.
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Karlsson, Lovisa
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Bioleaching of shale: impact of carbon source2011In: The new uranium mining boom: challenges and lessons learned / [ed] Broder Merkel, Mandy Schipek, Springer Berlin/Heidelberg, 2011, p. 449-454Conference paper (Refereed)
    Abstract [en]

    Bioleaching is often used for processing low-grade shale feedstock and the microbial community used for that purpose is supplied with nutrients such as sugar and/or Fe2+. In the present study, the leaching efficiency was tested when crushed weathered shale was mixed with aspen wood shavings and kept moist, at the mixtures field capacity. The purpose was to investigate whether a more complex carbon source and a lower content of water may be a feasible way of lowering the cost for bioleaching. After 56 days of incubation the amount of uranium mobilized from the shale reached some 1.7% with a minimum of effort and cost.

  • 17.
    Sjöberg, Viktor
    et al.
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Re-adsorption of uranium from low grade shale to aspen wood during heterotrophic leaching2011In: Proceedings of the 10th symposium on remediation in Dornburg / [ed] E. Kothe and G. Büchel, 2011Conference paper (Refereed)
  • 18.
    Sjöberg, Viktor
    et al.
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Impact of an Organic Carbon Source on the Leaching of Vanadium from LD-Slag2012In: 9th International Conference on Acid Rock Drainage,ICARD 2012, Ottawa, Canada, 20-26 May 2012: Volume 1 of 2, 2012, p. -700Conference paper (Refereed)
  • 19.
    Sjöberg, Viktor
    et al.
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Conditioning sulfidic mine waste for growth of Agrostis capillaris - impact on solution chemistry2014In: Environmental science and pollution research international, ISSN 0944-1344, E-ISSN 1614-7499, Vol. 21, no 11, p. 6888-6904Article in journal (Refereed)
    Abstract [en]

    Contamination of the environment due to mining and mineral processing is an urgent problem worldwide. It is often desirable to establish a grass cover on old mine waste since it significantly decreases the production of leachates. To obtain sustainable growth, it is often necessary to improve several properties of the waste such as water-holding capacity, nutrient status, and toxicity. This can be done by addition of organic materials such as wood residues, e. g., compost. In this study, we focus on the solution chemistry of the leachates when a substrate containing historic sulfidic mine waste mixed with 30 % (volume) bark compost is overgrown by Agrostis capillaris. The pot experiments also included other growth-promoting additives (alkaline material, mycorrhiza, and metabolizable carbon) to examine whether a more sustainable growth could be obtained. Significant changes in the plant growth and in the leachates composition were observed during 8 weeks of growth. It was concluded that in this time span, the growth of A. capillaris did not affect the composition of the leachates from the pots. Instead, the composition of the leachates was determined by interactions between the bark compost and the mine waste. Best growth of A. capillaris was obtained when alkaline material and mycorrhiza or metabolizable carbon was added to the substrate.

  • 20.
    Sjöberg, Viktor
    et al.
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Allard, Bert
    Örebro University, School of Science and Technology.
    Vegetation of historical mine waste from the Ljusnarsberg deposit with Agrostis capillaris: impact on leaching of copper2013In: Reliable mine water technology. Proceedings of the International Mine Water Association Annual Conference 2013, Golden, Colorado, USA, August 6-9, 2013, Golden Co. , 2013, p. 1119-1124Conference paper (Refereed)
    Abstract [en]

    In Sweden there are hundreds of sites that need to be remediated due to high release of metals such as Cu. In order to minimize costs the methods should involve cheap materials and technical solutions. This study focuses on the possibility to establish Agrostis capillaris on sulfidic mine waste, after mixing with 30 % bark compost, and the subsequent release of Cu. Ini- tially the substrate produced leachates with pH 3.5 containing approximately 1 mg/L Cu. After 4 months the pH had increased to 4.5 and up to 80 % of the Cu was retained     

  • 21.
    Sjöberg, Viktor
    et al.
    Örebro University, School of Science and Technology.
    Tachauer, Heloise
    Örebro University, School of Science and Technology.
    Grandin, Anna
    Örebro University, School of Science and Technology.
    Karlsson, Stefan
    Örebro University, School of Science and Technology.
    Leaching of low-grade black shale for recovery of vanadium, molybdenum and uranium2011In: 25th International Applied Geochemistry Symposium, 22-26 August, 2011, Rovaniemi, Finland / [ed] Pertti Sarala, V. Juhani Ojala, Marja-Leena Porsanger, Vuorimiesyhdistys , 2011, p. 132-133Conference paper (Refereed)
1 - 21 of 21
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