Dark Nitrogen Fixation: Expression and Potential in the Redoxcline of the Black Sea

James W Murray1, John B. Kirkpatrick1, Clara A Fuchsman2, James T. Staley3 and Evgeniy Yakushev4, (1)University of Washington, School of Oceanography and Astrobiology Program, Seattle, WA, United States, (2)University of Washington, School of Oceanography, Seattle, WA, United States, (3)University of Washington, Department of Microbiology and Astrobiology Program, Seattle, WA, United States, (4)Norwegian Institute for Water Research, NO-0349 Oslo, Norway