1. Department of Ecological Engineering, Toyohashi University of Technology, Toyohashi 441-8580,1
2. Department of Microbiology, St. Marianna University School of Medicine, Kawasaki 216-8511,2
3. Laboratory of Biology, School of Allied Medical Sciences, Shinshu University, Matsumoto 390-0802,3 and
4. Laboratory of Biology, Faculty of Humanities & Social Sciences, Iwate University, Morioka 020-8550,4 Japan