Natural Bacterial Communities Serve as Quantitative Geochemical Biosensors od Mark B. Smith, Andrea M. Rocha, Chris S. Smillie, Scott W. Olesen, Charles Paradis, Liyou Wu, James H. Campbell, Julian L. Fortney, Tonia L. Mehlhorn, Kenneth A. Lowe, Jennifer E. Earles, Jana Phillips, Steve M. Techtmann, Dominique C. Joyner, Dwayne A. Elias, Kathryn L. Bailey, Richard A. Hurt, Sarah P. Preheim, Matthew C. Sanders, Joy Yang, Marcella A. Mueller, Scott Brooks, David B. Watson, Ping Zhang, Zhili He, Eric A. Dubinsky, Paul D. Adams, Adam P. Arkin, Matthew W. Fields, Jizhong Zhou, Eric J. Alm, Terry C. Hazen