1. Forestry and Forest Products Research Institute, 1 Matsunosato, Tsukuba, Ibaraki 305-8687, Japan
2. International Center for Young Scientists (ICYS), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba 305-0044, Japan
3. Institute of Science and Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan