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ii ABSTRACT On April 20, 2010, the drilling rig Deepwater Horizon exploded in the Gulf of Mexico, resulting in the release of about 5 million barrels of crude oil into the environment. Coastal wetlands are particularly susceptible to oil contamination because they are composed largely of fine-grained sediments, which have a high capacity to adsorb oil and(More)
Sandstone-hosted roll-front uranium ore deposits originate when U(VI) dissolved in groundwater is reduced and precipitated as insoluble U(IV) minerals. Groundwater redox geochemistry, aqueous complexation, and solute migration are important in leaching uranium from source rocks and transporting it in low concentrations to a chemical redox interface where it(More)
[1] Linked tectonic, geochemical, and biologic processes lead to natural arsenic contamination of groundwater in Holocene alluvial aquifers, which are the main threat to human health around the world. These groundwaters are commonly found a long distance from their ultimate source of arsenic, where chemical weathering of As-bearing minerals occurs. We(More)
With the specter of dwindling biotic diversity, need is increased for preservatio n of available germplasm. Plant germplasm may be preserved in a variety of ways including seed storage, cryopreservation, and tissue culture. A new method of germplasm preservatio n may be through the storage of DNA libraries, which maintain in test tubes the genes tha t(More)
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