1. Department of Environmental Technology, Wageningen Agricultural University, Bomenweg 2, 6703 HD Wageningen, The Netherlands
2. Department of Molecular Physics, Wageningen Agricultural University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
3. Department of Microbiology, Wageningen Agricultural University, Hesselink van Suchtelenweg 4, 6703 CT Wageningen, The Netherlands