1. Graduate School of Science and Engineering, Department of Design and Media Technology Iwate University, 4‐3‐5, Ueda Morioka Iwate 020‐8551 Japan
2. Graduate School of Arts and Sciences, Division of Science and Engineering Iwate University, 4‐3‐5 Ueda Morioka Iwate 020‐8551 Japan
3. Division of Biology and Biological Engineering California Institute of Technology Pasadena California 91125 USA
4. Faculty of Science and Engineering Iwate University, 4‐3‐5 Ueda Morioka Iwate 020‐8551 Japan