1. Department of Materials Science and Engineering The Pennsylvania State University Steidle Building University Park PA 1680 USA
2. Department of Chemistry & Biochemistry National Institute of Technology, Numazu College 3600 Ooka Numazu Shizuoka 410‐8501 Japan
3. Department of Biological Chemistry Osaka Metropolitan University 1‐1 Gakuen‐cho Sakai Osaka 599‐8531 Japan