1. KFKI Atomic Energy Research Institute, P.O. Box 49, H-1525 Budapest Hungary, Institute of Macromolecular Chemistry, 2 Heyrovsky Sq., 16202, Prague, Czech Republic, Institute of Biophysics and X-ray Structure Research, 6 Schmiedlstrasse A-8042 Graz, Austria, Departmentof Colloid Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518, Budapest, Hungary, Institute for Solid State Physics and Optics, P.O. Box 49, H-1525, Budapest, Hungary, and Veterinary and Food Control Station of Veszprém County, H-8200,...