1. KWR, Watercycle Research Institute, P.O. Box
1072, 3430 BB Nieuwegein, The Netherlands
2. Wageningen
NMR Center, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
3. Laboratory
of Biochemistry, Wageningen University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands
4. Rijkswaterstaat, Postbus
17, 8200 AA Lelystad, The Netherlands
5. Institute
for Biodiversity and Ecosystem Dynamics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands