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Uranium (VI) Reduction by Denitrifying Biomass
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ABSTRACT
Groundwater near the S3 ponds at the US Department of Energy's Y-12 site in Oak Ridge, Tennessee, is contaminated by high levels of nitrate (up to 160 mM) and U(VI) (~0.3 mM). To minimize nitrate inhibition, the authors proposed extraction of contaminated groundwater, nitrate removal in a denitrifying fluidized bed bioreactor (FBR), and return of nitrate-free effluent to the aquifer to stimulate in situ microbial reduction of U(VI). In the presence of carbonate, U(VI) sorption...
Related newspaper, magazine, and journal articles from HighBeam Research
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ELECTROPHILIC HALOGENATION OF nido-5,6-C^sub 2^B^sub 8^H^sub 12^
Collection of Czechoslovak Chemical Communications
; Room-temperature chlorination of the dicarbaborane nido-5,6-C^sub 2^B^sub 8^H^sub 12^ (1) with CCl^sub 4^ in the presence of anhydrous AlCl^sub 3^ yielded a mixture of 7-Cl-5,6-C^sub 2^B^sub 8^H^sub 11^ (7-Cl-1) (yield 34 4-Cl-5,6-C^sub 2^B^sub 8^H^sub 11^ (4-Cl-1) (yield 20 3-Cl-5,6-C^sub 2^B^sub
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POLYHEDRAL MONOCARBABORANE CHEMISTRY. FUNCTIONALITY AND ISOMERISM: REACTIONS OF THE [6-Ph-nido-6-CB^sub 9^H^sub 11^]^sup -^ ANION WITH AMINOPYRIDINES NC^sub 5^H^sub 4^NH^sub 2^ TO YIELD NEUTRAL arachno AND closo TEN-VERTEX MONOCARBABORANE DERIVATIVES
Collection of Czechoslovak Chemical Communications
; Reaction of NC^sub 5^H^sub 4^-2-NH^sub 2^ with the [6-Ph-nido-6-CB^sub 9^H^sub 11sup -^ anion (1) in the presence of hydrated FeCl^sub 3^ gives [6-Ph-9-(NC^sub 5^H^sub 4^-2-NH^sub 2arachno-6-CB^sub 9^H^sub 12^] (4) and thence [1-Ph-2-(NC^sub 5^H^sub 4^-2-NH^sub 2closo-1-CB^sub 9^H^sub 8^] (5), in
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Modeling of the Solubilities of NiO/NiAl^sub 2^O^sub 4^ and FeO/FeAl^sub 2^O^sub 4^ in Cryolite Melts at 1300 K
Metallurgical and Materials Transactions
; Experiments to measure the solubilities of NiOTNiAl^sub 2^O^sub 4^ and FeO/FeAl^sub 2^O^sub 4^ were performed, and the results confirmed existing literature values. The solubilities of NiAl^sub 2^O^sub 4^ and FeAl^sub 2^O^sub 4^ in Al^sub 2^O^sub 3^-saturated cryolite melts at 1300 K were modeled
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Thermodynamics and Kinetics of the Formation of Al^sub 2^O^sub 3^/ MgAl^sub 2^O^sub 4^/MgO in Al-Silica Metal Matrix Composite
Metallurgical and Materials Transactions
; The formation of Al^sub 2^O^sub 3^, MgAl^sub 2^O^sub 4^, and MgO has been widely studied in different Al base metal matrix composites, but the studies on thermodynamic aspects of the Al^sub 2^O^sub 3^/ MgAl^sub 2^O^sub 4^/MgO phase equilibria have been limited to few systems such as Al/Al^sub
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A Direct Free Thyroxine (T^sub 4^) Immunoassay with the Characteristics of a Total T^sub 4^ Immunoassay
Clinical Chemistry
; Background: Direct free thyroxine (T^sub 4^) measurements have been linked to both T^sub 4^-binding serum protein concentrations and protein-bound T^sub 4^ concentrations. Whether this is evidence of a relationship to total T^sub 4^ concentrations has not been reported. Methods: We compared an
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Quantitative characterization of the microstructure of two-phase TiB^sub 2^ + Al^sub 2^O^sub 3^ ceramics using mean integral curvature
Metallurgical and Materials Transactions
; Two-phase TiB^sub 2^ + Al^sub 2^O^sub 3^ ceramics with an interconnected or dispersed TiB^sub 2^ (minor)-phase microstructure can be produced by variations in processing parameters. A standard method of quantitative characterization of the microstructural bias, i.e., the degree of TiB^sub 2^ phase
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cis-Regulatory Elements for Mesophyll-Specific Gene Expression in the C^sub 4^ Plant Flaveria trinervia, the Promoter of the C^sub 4^ Phosphoenolpyruvate Carboxylase Gene(W)
Plant Cell
; C^sub 4^ photosynthesis depends on the strict compartmentalization of CO2 assimilatory enzymes, cis-regulatory mechanisms are described that ensure mesophyll-specific expression of the gene encoding the C^sub 4^ isoform of phosphoenolpyruvate carboxylase (ppcA1) of the C^sub 4^ dicot Flaveria
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Mechanical Behaviors of Chromium- or Niobium-Modified Ni^sub 47.5^Al^sub 25^Fe^sub 27.5^ Alloy at Elevated Temperature
Metallurgical and Materials Transactions
; The microstructure of the Ni^sub 47.5^Al^sub 25^Fe^sub 27.5^ alloy was modified by adding Cr or Nb to improve its tensile properties. Increasing the Cr content increased the volume fraction of the interdendritic regions and, subsequently, increased the tensile elongation at room temperature.
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The Mechanical Milling of Al/TiO^sub 2^ Composite Powders
JOM
; The processing of Al/TiO^sub 2^ composite powders produced by high-energy mechanical milling leads to production of a range of valuable, titanium-based materials. They include Ti(Al,O)Al^sub 2^O^sub 3^ and Ti^sub x^Al^sub y^(O)/Al^sub 2^O^sub 3^ composite powders, bulk composites and Ti^sub
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The Effect of Nb and W Alloying Additions to the Thermal Expansion Anisotropy and Elastic Properties of Mo^sub 5^Si^sub 3^
Metallurgical and Materials Transactions
; The directional thermal expansion and elastic properties of Mo^sub 5^Si^sub 3^, (Mo^sub 0.8^Nb^sub 0.2sub 5^Si^sub 3^, and (Mo^sub 0.85^W^sub 0.15sub 5^Si^sub 3^ have been studied as a function of temperature through the use of single crystals. Thermal expansion anisotropy was reduced by Nb and W
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