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Full-Text Articles in Engineering
Microbial Reduction Of Crystalline Iron(Iii) Oxides: Influence Of Oxide Surface Area And Potential For Cell Growth, Eric E. Roden, John M. Zachara
Microbial Reduction Of Crystalline Iron(Iii) Oxides: Influence Of Oxide Surface Area And Potential For Cell Growth, Eric E. Roden, John M. Zachara
US Department of Energy Publications
Quantitative aspects of microbial crystalline iron- (III) oxide reduction were examined using a dissimilatory iron(III) oxide-reducing bacterium (Shewanella alga strain BrY). The initial rate and long-term extent of reduction of a range of synthetic iron(III) oxides were linearly correlated with oxide surface area. Oxide reduction rates reached an asymptote at cell concentrations in excess of ≈1 x 109/m2 of oxide surface. Experiments with microbially reduced goethite that had been washed with pH 5 sodium acetate to remove adsorbed Fe(II) suggested that formation of a Fe(II) surface phase (adsorbed or precipitated) limited the extent of iron(III) oxide …
Speciation Of Uranium In Fernald Soils By Molecular Spectroscopic Methods: Characterization Of Untreated Soils, David E. Morris, Patrick G. Allen, John M. Berg, Catherine J. Chisholm-Brause, Steven Conradson, Robert Donohoe, Nancy Hess, John Musgrave, C. Drew Tait
Speciation Of Uranium In Fernald Soils By Molecular Spectroscopic Methods: Characterization Of Untreated Soils, David E. Morris, Patrick G. Allen, John M. Berg, Catherine J. Chisholm-Brause, Steven Conradson, Robert Donohoe, Nancy Hess, John Musgrave, C. Drew Tait
US Department of Energy Publications
A combination of X-ray absorption, optical luminescence, and Raman vibrational spectroscopies along with ancillary techniques such as energy dispersive scanning electron microscopy and powder X-ray diffraction have been used to determine the chemical form of uranium in contaminated soils from the United States Department of Energy’s (DOE) former uranium production facility located at Fernald, OH (30 km NW of Cincinnati). The analyses described here have been carried out on soil samples prior to the application of various decontamination technologies under development within the DOE’s Uranium in Soils Integrated Demonstration Project. X-ray absorption studies have shown that ~75-95% of the uranium …
A General Protocol For Restoration Of Regulated Rivers, Jack A. Stanford, J. V. Ward, William J. Liss, Christopher A. Frissell, Richard N. Williams, James A. Lichatowich, Charles C. Coutant
A General Protocol For Restoration Of Regulated Rivers, Jack A. Stanford, J. V. Ward, William J. Liss, Christopher A. Frissell, Richard N. Williams, James A. Lichatowich, Charles C. Coutant
US Department of Energy Publications
Large catchment basins may be viewed as ecosystems in which natural and cultural attributes interact. Contemporary river ecology emphasizes the four-dimensional nature of the river continuum and the propensity for riverine biodiversity and bioproduction to be largely controlled by habitat maintenance processes, such as cut and fill alluviation mediated by catchment water yield. Stream regulation reduces annual flow amplitude, increases baseflow variation and changes temperature, mass transport and other important biophysical patterns and attributes. As a result, ecological connectivity between upstream and downstream reaches and between channels, ground waters and floodplains may be severed. Native biodiversity and bioproduction usually are …