1. Geomicrobiology Group, Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Monobe, Nankoku, Kochi, Japan
2. Geobio-Engineering and Technology Group, Submarine Resources Research Project, JAMSTEC, Monobe, Nankoku, Kochi, Japan
3. Marine Works Japan Ltd., Oppama-higashi, Yokosuka, Japan