1. Graduate School of Science and Engineering, Saitama University, 255 Shimo-Okubo, Saitama 338-8570, Japan
2. Biomolecular Characterization Unit, Center of Sustainable Resource Science, RIKEN, 2-1 Wako, Saitama 351-0198, Japan
3. Advanced Electronic Materials Center, National Institute of Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan