1. Division of Applied Physics, Faculty of Engineering, Hokkaido University, N13 W8 Kita-ku, Sapporo, Hokkaido 060-8628, Japan
2. Graduate School of Frontier Science, The University of Tokyo, 6-2-3 Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
3. Anhydrobiosis Research Group, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, Ohwashi 1-2, Tsukuba, Ibaraki 305-8634, Japan
4. Graduate School of Frontier Sciences, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-8561, Japan