1. The Environmental Microbiology/Biotechnology Research Group, BioCentrum-DTU, Building 227, The Technical University of Denmark, 2800 Lyngby, Denmark
2. The Environmental Microbiology/Biotechnology Research Group, BioCentrum-DTU, Building 227, The Technical University of Denmark, 2800 Lyngby, Denmark Department of Agricultural Engineering, Research Center Bygholm, P.O. Box 536, 8700 Horsens, Denmark
3. The Environmental Microbiology/Biotechnology Research Group, BioCentrum-DTU, Building 227, The Technical University of Denmark, 2800 Lyngby, Denmark,