A5086565038- Geology and Paleoclimatology Research
- Urban Stormwater Management Solutions
- Heavy metals in environment
- Hydrology and Watershed Management Studies
- Atmospheric and Environmental Gas Dynamics
- Groundwater and Isotope Geochemistry
- Hydrocarbon exploration and reservoir analysis
- Geochemistry and Geologic Mapping
- Smart Materials for Construction
- Flood Risk Assessment and Management
- Soil erosion and sediment transport
- Archaeology and ancient environmental studies
- Hydrology and Sediment Transport Processes
- Archaeology and Natural History
- Groundwater flow and contamination studies
- American Environmental and Regional History
- Water Quality and Pollution Assessment
- Soil and Water Nutrient Dynamics
- Geological formations and processes
- Atmospheric chemistry and aerosols
- Isotope Analysis in Ecology
- Radioactivity and Radon Measurements
- Land Use and Ecosystem Services
- Education, sociology, and vocational training
- Tree-ring climate responses
University of Pittsburgh
2015-2024
Planetary Science Institute
2008-2024
West Virginia University
2018
National Energy Technology Laboratory
2015
United States Geological Survey
2004-2007
Johns Hopkins University
2003-2005
Human-engineered landscapes and subsequent altered hydrology affect the fate transport of reactive nitrogen, particularly in urban watersheds. In this study, we used dual-nitrate isotopes mixing model analysis (δ(15)N δ(18)O NO3(-)) to quantify nitrogen inputs from two sources concentrated systems, sewage atmospheric deposition. Analysis was conducted on samples collected Nine Mile Run (Pittsburgh, PA) including over years biweekly through hydrographs four storm events. Mixing models...
The mining and use of copper by prehistoric people on Michigan's Keweenaw Peninsula is one the oldest examples metalworking. We analyzed concentration lead, titanium, magnesium, iron, organic matter in sediment cores recovered from three lakes located near mine pits to investigate timing, location, magnitude ancient pollution. Lead concentrations were normalized lithogenic metals account for processes that can influence natural (or background) lead delivery. Nearly simultaneous enrichments...
Aquatic ecosystems are sensitive to the modification of hydrologic regimes, experiencing declines in stream health as streamflow regime is altered during urbanization. This study uses records quantify type and magnitude changes across urbanization gradients nine U.S. cities (Atlanta, GA, Baltimore, MD, Boston, MA, Detroit, MI, Raleigh, NC, St. Paul, MN, Pittsburgh, PA, Phoenix, AZ, Portland, OR) two physiographic settings. Results indicate similar development trajectories among gradients,...
Geochemical measurements on well-dated sediment cores from Lake Er (Erhai) are used to determine the timing of changes in metal concentrations over 4500 years Yunnan, a borderland region southwestern China noted for rich mineral deposits but with inadequately documented metallurgical history. Our findings add new insight into impacts and environmental legacy human exploitation resources Yunnan We observe an increase copper at 1500 BC resulting atmospheric emissions associated metallurgy....
ABSTRACT Microbial activity in the produced water from hydraulically fractured oil and gas wells may potentially interfere with hydrocarbon production cause damage to well surface infrastructure via corrosion, sulfide release, fouling. In this study, we surveyed microbial abundance community structure of sampled 42 Marcellus Shale southwestern Pennsylvania (well age ranged 150 1,846 days) better understand diversity water. We sequenced V4 region 16S rRNA gene assess taxonomy utilized...
Abstract Platinum (Pt) drugs are the most potent and commonly used anti-cancer chemotherapeutics. Nanoformulation of Pt has potential to improve delivery tumors reduce toxic side effects. A major challenge for translating nanodrugs clinical settings is their rapid clearance by reticuloendothelial system (RES), hence increasing toxicities on off-target organs reducing efficacy. We reporting that an FDA approved parenteral nutrition source, Intralipid 20%, can help this problem. dichloro (1,...
Abstract Decarbonatization initiatives have rapidly increased the demand for lithium. This study uses public waste compliance reports and Monte Carlo approaches to estimate total lithium mass yields from produced water (PW) sourced Marcellus Shale in Pennsylvania (PA). Statewide, PW has substantial extractable lithium, however, concentrations, production volumes extraction efficiencies vary between northeast southwest operating zones. Annual estimates suggest statewide of approximately 1160...
Legacy effects of past land use and disturbance are increasingly recognized, yet consistent definitions criteria for defining them do not exist. To address this gap in biological- ecosystem-assessment frameworks, we propose a general metric evaluating potential legacy effects, which computed by normalizing altered system function persistence with duration disturbance. We also two distinct legacy-effect categories: signal from lags transport structural physical landscape changes. Using flux...
Abstract Mesenchymal stem cells (MSCs) are among the major used for cell therapy and regenerative medicine. In-vivo cell-tracking by magnetic resonance imaging (MRI) is crucial medicine, allowing verification that transplanted reach targeted sites. Cellular MRI combined with superparamagnetic iron-oxide (SPIO) contrast agents an effective method. Here, we reporting a new “bio-mimicry” method making use of “ in-vivo environment” MSCs to prepare native MSCs, so (i) phagocytic activity cultured...
Simulations conducted using a coupled lake‐catchment, hydrologic and isotope mass‐balance model indicate that small, closed‐basin lakes in north‐central Washington are isotopically sensitive to changes precipitation, relative humidity, temperature. Most notably, simulations predicted inconsistent lake responses precipitation due differences outseepage rates surface area volume (SA :V) ratios. Greater within experiments resulted increased sensitivity mean precipitation. Moreover, suggest...
Leaking sewer infrastructure contributes nonpoint nitrogen pollution to groundwater and surface water in urban watersheds. However, these inputs are poorly quantified watershed budgets, potentially underestimating pollutant loadings. In this study, we used inverse methods constrain dissolved inorganic (DIN) from sewage Nine Mile Run (NMR), an (1570 ha) Pittsburgh, Pennsylvania (USA) characterized by extensive impervious cover (38%). Water samples were collected biweekly over two years...
Elevated concentration of naturally occurring radioactive material (NORM) in wastewater generated from Marcellus Shale gas extraction is great concern due to potential environmental and public health impacts. Development a rapid robust method for analysis Ra-226, which the major NORM component this water, critical selection appropriate management approaches properly address regulatory concerns. Traditional methods Ra-226 determination require long sample holding time or detection time. A...
Isle Royale, in Lake Superior, contains evidence of indigenous copper mining; however, the timing and geographical extent mining activity is poorly known. We analyzed metal, carbon, nitrogen, organic matter concentrations to document past pollution sediment cores recovered from McCargoe Cove; a long, narrow inlet Superior on Royale that receives drainage watershed numerous ancient mines. At Cove, lead, copper, potassium increase sediments after ad 1860 between 6500 5400 years before 1950 (yr...
Recent large-scale development of oil and gas from low-permeability unconventional formations (e.g., shales, tight sands, coal seams) has raised concern about potential environmental impacts. If left improperly sealed, legacy wells colocated with that new represent a pathway for unwanted migration fluids (brine, drilling stimulation fluids, oil, gas). Uncertainty in the number, location, abandonment state hinders assessment exploration production activity. The objective this study is to...
Reports of ground water contamination in a southwestern Pennsylvania community coincided with unconventional shale gas extraction activities that started late 2009. Residents participated survey and well samples were collected analyzed. Available pre-drill post-drill test results legacy operations (e.g., oil wells, coal mining) reviewed. Fifty-six the 143 respondents indicated changes quality or quantity while 63 reported no issues. Color change (brown, black, orange) was most common (27...