Tonia L. Mehlhorn
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View article: Diel mercury concentration variations in a mercury-impacted stream
Diel mercury concentration variations in a mercury-impacted stream Open
Diel patterns in mercury and methylmercury concentration were studied at several distinct locations (downstream forested, midstream urban/suburban, upstream industrial) along a mercury-contaminated creek in summer and winter.
View article: Data set accompanying "Diel Mercury Concentration Variations in a Mercury-Impacted Stream"
Data set accompanying "Diel Mercury Concentration Variations in a Mercury-Impacted Stream" Open
This dataset accompanies the journal publication ?Diel Mercury Concentration Variations in a Mercury-Impacted Stream? by the same authors.
View article: Integrated characterization of subsurface media from locations up- and down-gradient of a uranium-contaminated aquifer
Integrated characterization of subsurface media from locations up- and down-gradient of a uranium-contaminated aquifer Open
The processing of sediment to accurately characterize the spatially-resolved depth profiles of geophysical and geochemical properties along with signatures of microbial density and activity remains a challenge especially in complex contami…
View article: Intraday Water Quality Patterns in East Fork Poplar Creek with an Emphasis on Mercury and Monomethylmercury
Intraday Water Quality Patterns in East Fork Poplar Creek with an Emphasis on Mercury and Monomethylmercury Open
We conducted a diel sampling campaign at three locations along the Hg contaminated East Fork Poplar Creek (EFPC) in Oak Ridge, Tennessee to (i) quantify diel patterns of particulate and dissolved mercury (Hg) and monomethylmercury (MMHg) (…
View article: Bacterial Community Shift and Coexisting/Coexcluding Patterns Revealed by Network Analysis in a Uranium-Contaminated Site after Bioreduction Followed by Reoxidation
Bacterial Community Shift and Coexisting/Coexcluding Patterns Revealed by Network Analysis in a Uranium-Contaminated Site after Bioreduction Followed by Reoxidation Open
A site in Oak Ridge, TN, USA, has sediments that contain >3% iron oxides and is contaminated with uranium (U). The U(VI) was bioreduced to U(IV) and immobilized in situ through intermittent injections of ethanol. It then was allowed to reo…
View article: Mercury Remediation Technology Development for Lower East Fork Poplar Creek - FY 2016 Progress Report
Mercury Remediation Technology Development for Lower East Fork Poplar Creek - FY 2016 Progress Report Open
Mercury remediation is a high priority for the US Department of Energy (DOE) Oak Ridge Office of Environmental Management (OREM), especially at and near the Y-12 National Security Complex (Y-12) where historical mercury use has resulted in…
View article: Soil Investigation of Lower East Fork Poplar Creek
Soil Investigation of Lower East Fork Poplar Creek Open
Mercury is regarded by the US Department of Energy (DOE) Oak Ridge Office of Environmental Management as a priority contaminant on the Oak Ridge Reservation because of the environmental risks associated with substantial losses from buildin…
View article: Temporal Dynamics of In-Field Bioreactor Populations Reflect the Groundwater System and Respond Predictably to Perturbation
Temporal Dynamics of In-Field Bioreactor Populations Reflect the Groundwater System and Respond Predictably to Perturbation Open
Temporal variability complicates testing the influences of environmental variability on microbial community structure and thus function. An in-field bioreactor system was developed to assess oxic versus anoxic manipulations on in situ grou…
View article: Mercury Content of Sediments in East Fork Poplar Creek: Current Assessment and Past Trends
Mercury Content of Sediments in East Fork Poplar Creek: Current Assessment and Past Trends Open
This study provided new information on sediment mercury (Hg) and monomethylmercury (MMHg) content and chemistry. The current inventory of Hg in East Fork Poplar Creek (EFPC) bed sediments was estimated to be 334 kg, which represents a ~67%…
View article: Replicates, Read Numbers, and Other Important Experimental Design Considerations for Microbial RNA-seq Identified Using Bacillus thuringiensis Datasets
Replicates, Read Numbers, and Other Important Experimental Design Considerations for Microbial RNA-seq Identified Using Bacillus thuringiensis Datasets Open
RNA-seq is being used increasingly for gene expression studies and it is revolutionizing the fields of genomics and transcriptomics. However, the field of RNA-seq analysis is still evolving. Therefore, we specifically designed this study t…
View article: Mercury Remediation Technology Development for Lower East Fork Poplar Creek - FY 2015 Progress Report
Mercury Remediation Technology Development for Lower East Fork Poplar Creek - FY 2015 Progress Report Open
Mercury remediation is a high priority for the US Department of Energy (DOE) Oak Ridge Office of Environmental Management (OREM) because of large historical losses of mercury within buildings and to soils and surface waters at the Y-12 Nat…