1. Agricultural University Wageningen, Department of Agricultural Engineering and Physics, Duivendaal 1,6701 AP Wageningen, The Netherlands (D.B., H.V.); Institute of Isotope and Molecular Technology, P.O. Box 700 Cluj-Napoca 5, Rumania (M.C., D.D.); and Agricultural University Wageningen, Department of Human Nutrition, De Dreyen, Bomenweg 2, Wageningen, The Netherlands (P.V.)