1 Department of Environmental and Biological Sciences, Biogeochemistry research group, University of Eastern Finland, Yliopistoranta 1D E, PO Box 1627, Kuopio campus, FI-70211, Finland. narasinha.shurpali@uef.fi.
2 Department of Physics, P.O. Box 48, University of Helsinki, Helsinki, 00014, Finland.
3 Department of Environmental and Biological Sciences, Biogeochemistry research group, University of Eastern Finland, Yliopistoranta 1D E, PO Box 1627, Kuopio campus, FI-70211, Finland.
4 Department of Food and Environmental Sciences, Division of Microbiology and Biotechnology, P.O. Box 56, University of Helsinki, Helsinki, FI-00014, Finland.
5 Natural Resources Institute Finland, Green technology, Halolantie 31A, Maaninka, FI-71750, Finland.