Z Y Wang1, M Shimonaga, Y Muraoka, M Kobayashi, T Nozawa. 1. Department of Biomolecular Engineering, Faculty of Engineering, Center for Interdisciplinary Research, Tohoku University, Aramaki, Aoba 07, Aoba-ku, Sendai, 980-8579, Japan, wang@biophys.che.tohoku.ac.jp.