Scientists contributing to this project also include M. DeFlaun (Envirogen Inc.), D. Moser (Princeton University), Joost Hoek (Penn State Univeristy), W. Ghiorse (Cornell University), T. Phelps (Oak Ridge National Laboratory), S. Pfiffner (Oak Ridge) F. Colwell (Idaho National Engineering and Environmental Laboratory), T. Kieft (New Mexico Tech), A-L. Reysenbach (Portland State University), J. Fredrickson (Pacific Northwest National Laboratory), G. Southam (Northern Arizona University). S. Kotelnikova (U. Göteborg, Sweden), K. Pedersen (U. Göteborg, Sweden), and G. Slater (University of Toronto).