1. Max Planck Institute
for Polymer Research, 55128 Mainz, Germany
2. Department
of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113-8656, Japan
3. Institut
für Chemie neuer Materialien, Universität Osnabrück, D-49069 Osnabrück, Germany
4. Department
of Physics, University of Ioannina, P.O. Box 1186, 451 10 Ioannina, Greece