1. Wageningen Agricultural University, Dept. of Agricultural, Environmental and Systems Technology, Subdepartment of Environmental Technology “Biotechnion” Bomenweg 2, P.O. Box 8129, 6700 EV, Wageningen, The Netherlands
2. Wageningen Agricultural University, Department of Plant Cytology and Morphology, Arboretumlaan 4, 6703 BD, Wageningen, The Netherlands
3. Biothane Systems International, P.O. Box 5068, 2600 GB, Delft, The Netherlands