32 research outputs found
Molecular Characterization of Cr Phases in Contaminated Soils by Cr and Fe EXAFS : A Tool for Evaluating Chemical Remediation Strategies
The successful remediation of Cr contaminated soils via chemical reduction and stabilization of soluble, toxic Cr(VI) species to insoluble Cr(III) species relies on the long term leachability and reoxidation of reduced Cr compounds. Information of Cr chemical environments is invaluable for evaluating the efficiency of proposed stabilization technologies. We describe a matrix of Fe and Cr K-edge EXAFS data on synthetic model compounds that have been used to identify different Fe and Cr local environments of two soil samples
Immunochemical and Biological Reactivity of Human Anti-Lipopolysaccharide IgG Obtained by Screening of Blood Donors
Interaction ofErwinia spp. andFusarium roseum âSambucinumâ on the Russet Burbank potato
THE IMPACT OF NASAL CARRIAGE OF METHICILLIN-RESISTANT AND METHICILLIN-SUSCEPTIBLE STAPHYLOCOCCUS AUREUS
Diversities in Perceived Knowledge and Practice of Preoperative Skin Preparation in Swedish Orthopaedic Surgery
Climatic control of fluvial-lacustrine cyclicity in the Cretaceous Cordilleran Foreland Basin, western United States
Tectono-stratigraphic models of foredeep sedimentation have generally presumed a direct link between changing rates of tectonism and concomitant sedimentological response as manifested by change in thickness, composition or depositional environment of sediment accumulating in adjacent basins. Lacustrine limestone units within the early Cretaceous fluvial/lacustrine Gannett Group of western Wyoming exhibit systematic variation in several geochemical proxies of relative rates of precipitation and evaporation, indicating that lakewater chemistry was controlled by variation in regional climate. Change in proportion of allochthonous terrigenous clastic vs. autochthonous carbonate deposition, as well as carbonate Mg/Ca ratio and stable isotopic composition, occurs at two scales. Metre-scale alternation of micritic limestone and argillaceous marl is accompanied by mineralogical and isotopic variation within individual beds, indicating preferential carbonate accumulation during intervals of decreased regional meteoric precipitation relative to lake-surface evaporation. Limestone deposition began during intervals of maximum aridity, and decreased as increased meteoric precipitation-driven flux of terrigenous clastic sediment overwhelmed sites of carbonate accumulation. Similar upsection variation in limestone mineralogy and isotopic composition at a scale of tens of metres reflects the multiple processes of long-term increase in meteoric precipitation and lakewater freshening prior to influx of terrigenous sediment, across-basin fluvial-deltaic progradation, and renewed accumulation of riverine terrigenous units. Such trends suggest that formation-scale alternation between fluvial clastic and lacustrine carbonate deposition was controlled by climate change.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/75290/1/j.1365-3091.1996.tb02020.x.pd