1. Department of Material and Life Science, Graduate School of Engineering, Osaka University, ALCA, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
2. Picobiology Institute, Graduate School of Life Science, University of Hyogo, Hyogo 678-1297, Japan
3. Department of Bioinspired Science, Ewha Womans University, Seoul 120-750, Korea