1. Research Institute for Cell Engineering, National Institute of Advanced Industrial Science and Technology (AIST), Ikeda 563-8577, Japan, University of Twente, MESA+ Institute for Nanotechnology and Faculty of Science and Technology, Department of Materials Science and Technology of Polymers, P.O. Box 217, 7500 AE Enschede, The Netherlands, Graduate School of Science, Osaka University, Toyonaka 560-0043, Japan