1. Department of Biological Sciences, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931-1295
2. Department of Mechanical Engineering−Engineering Mechanics, Michigan Technological University, 1400 Townsend Drive, Houghton, Michigan 49931-1295
3. Center for Diesel Research, Department of Mechanical Engineering, University of Minnesota, 111 Church Street SE, Minneapolis, Minnesota 55455-0111