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Front Cover. Schematic model of eukaryotic nitrate reductase showing the domain structure of each monomeric unit of homodimer. Cofactor binding sites are shown for each domain of the subunit. Reaction catalyzed by nitrate reductase is also shown. Courtesy of W.H. Campbell, Ph.D., Nitrate Elimination Company, Lake Linden, MI 49945.Back Cover. Reaction sequence of nitrite produced by enzymatic reduction of nitrate with Griess reagents-sulfanilamide and N-(1-Naphthyl) ethylenediamine-to form a pink azo dye with an absorption maximum of 543 nanometers.For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment, visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit http://www.usgs.gov/pubprod To order this and other USGS information products, visit