1. Faculty of Environmental Science and Technology, Okayama University, 3-1-1 Tsushima-naka, Okayama 700−8530 Japan, Faculty of Engineering, Okayama University, 3-1-1 Tsushima-naka, Okayama 700-8530 Japan, and Toyobo Research Center, Toyobo Co., Ltd., 1-1 Katata 2-Chome, Ohtsu 520−0292 Japan