1. Institut Charles Sadron (CNRS-ULP), 6, rue Boussingault, 67083 Strasbourg, France, Institut de Génétique et de Biologie Moléculaire et Cellulaire, 1, Rue Laurent Fries, BP 163, 67404 Illkirch, France, Faculty of Science and Engineering, Ritsumeikan University, Noji-Higashi, Kusatsu, Shiga 525-8577, Japan, Maurice Morton Institute and Department of Polymer Science, The University of Akron, Akron, Ohio 44325-3909