A5101903973- Geology and Paleoclimatology Research
- Marine and coastal ecosystems
- Reservoir Engineering and Simulation Methods
- Isotope Analysis in Ecology
- Methane Hydrates and Related Phenomena
- Hydraulic Fracturing and Reservoir Analysis
- Oil and Gas Production Techniques
- Toxic Organic Pollutants Impact
- Balance, Gait, and Falls Prevention
- Geological and Tectonic Studies in Latin America
- Microbial Community Ecology and Physiology
- Geological formations and processes
- Geochemistry and Geologic Mapping
- Atmospheric and Environmental Gas Dynamics
- Hydrology and Watershed Management Studies
- Lower Extremity Biomechanics and Pathologies
- Advanced Materials Characterization Techniques
- Phase Equilibria and Thermodynamics
- Semiconductor materials and devices
- Tropical and Extratropical Cyclones Research
- Coastal wetland ecosystem dynamics
- Atmospheric chemistry and aerosols
- Graphite, nuclear technology, radiation studies
- Electron and X-Ray Spectroscopy Techniques
- Radioactive contamination and transfer
Environment Agency
2025
Aquatic Systems (United States)
2015-2024
California State University, Fullerton
2023
SUNY Brockport
2021
York University
2021
University of Waterloo
2015-2021
Regional Municipality of Waterloo
2021
The University of Sydney
2001-2017
Australian Centre for Robotic Vision
2017
University of Connecticut
2013-2015
In recent decades, the land-ocean aquatic continuum, commonly defined as interface, or transition zone, between terrestrial ecosystems and open ocean, has undergone dramatic changes. On-going work stressed importance of treating Aquatic Critical Zones (ACZs) a sensitive system needing intensive investigation. Here, we discuss fjords an ACZ in context sedimentological, geochemical, climatic impacts. These diverse physical features are key controlling sources, transport, burial organic matter...
Transition metals such as iron are reactive components of environmentally relevant surfaces. Here, dark reaction Fe(III) with catechol and guaiacol was investigated in an aqueous solution at pH 3 under experimental conditions that mimic reactions the adsorbed phase water. Using UV-vis spectroscopy, liquid chromatography, mass spectrometry, elemental analysis, dynamic light scattering, electron microscopy techniques, we characterized reactants, intermediates, products a function time. The...
Two commonly used proxies based on the distribution of glycerol dialkyl tetraethers (GDGTs) are TEX 86 (TetraEther indeX carbon atoms) paleothermometer for sea surface temperature reconstructions and BIT (Branched Isoprenoid Tetraether) index reconstructing soil organic matter input to ocean. An initial round‐robin study two sediment extracts, in which 15 laboratories participated, showed relatively consistent values (reproducibility ±3–4°C when translated temperature) but a large spread...
Coastal margins play a significant role in the burial of organic matter (OM) on Earth. These vary considerably with respect to their efficiency OM and amounts periodicity delivery, depending large part whether they are passive or active margins. In context global warming, these coastal regions expected experience higher water temperatures, changes riverine inputs OM, sea level rise. Low-oxygen conditions continue expand around globe estuarine (i.e., hypoxic zones) shelf oxygen minimum...
Hurricanes passing over the ocean can mix water column down to great depths and resuspend massive volumes of sediments on continental shelves. Consequently, organic carbon reduced inorganic compounds associated with these be resuspended from anaerobic portions seabed re-exposed dissolved oxygen (DO) in column. This process drive DO consumption as become oxidized. Previous studies have investigated effect hurricanes different coastal regions world, highlighting alleviation hypoxic conditions...
Abstract This article presents a commentary on history of muddy flooding caused by soil erosion linked to maize cultivation, focusing the Otter Valley in East Devon, UK. Research has associated with compaction during harvesting and crop planting moist conditions, which reduces soil's ability absorb rainfall increases risk runoff events. Careful management practices, such as early varieties, addressing compaction, ensuring cover, can often mitigate these issues. A growing concern, however, is...
Atmospheric mixing ratios and seawater concentrations of bromoform (CHBr 3 ), dibromomethane (CH 2 Br other brominated very short‐lived substances (BrVSLS) were measured during five cruises from 1994 to 2010. These conducted over large latitudinal (62°N–60°S) longitudinal transects (11°W–86°W) in the Atlantic Ocean. Elevated CHBr CH often observed regions where chlorophyll a also elevated, which suggests biogeochemical processes associated with photosynthetic biomass may be related...
Two numerical issues important to proper problem specification for pressure-based algorithms are investigated, including (1) well posedness of the pressure-correction equation, and (2) prescription flow variables at open boundaries, particularly if inflow occurs. Lid-driven cavity past a backward-facing step used help discuss issues. It is shown that during each iteration, explicit enforcement global mass conservation even intermediate, nonconvergent field in order maintain good convergence...
Hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) is a common constituent of military explosives. Despite RDX contamination at numerous U.S. facilities and its mobility to aquatic systems, the fate in marine systems remains largely unknown. Here, we provide mineralization pathways rates seawater sediments, highlighting for first time importance denitrification pathway determining RDX-derived N. (15)N nitro group labeled ((15)N-[RDX], 50 atom %) was spiked into mesocosm simulating shallow...
Abstract Fjords are disproportionately important for global organic carbon (OC) burial relative to their spatial extent and may be in sequestering atmospheric CO 2 , providing a negative climate feedback. Within fjords, multiple locally variable delivery mechanisms control mineral sediment deposition, which turn modulates OC burial. Sediment sources Fiordland, New Zealand, include terrigenous input at fjord heads, reworking over fjord‐mouth sills, landslide events from steep walls. Box cores...
Natural falcarinol-type (FC-type) polyacetylenes are known to show anticancer activities. We studied the bioactivity of synthetic FC, 1,2-dihydrofalcarinol (FCH) and 3-acetoxyfalcarinol (FCA) compared them with natural bioactive polyacetylene [9,17-octadecadiene-12,14-diyne-1,11,16-triol,1-acetate] (DCA) isolated from Devil's club (DC) Oplopanax horridus. Antiproliferation activity these polyacetylenes, along DC inner stem bark 70% ethanol water extracts, was tested on human pancreatic...
The lack of knowledge on the fate explosive compounds 2,4,6-trinitrotoluene (TNT) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), particularly in marine ecosystems, constrains application bioremediation techniques explosive-contaminated coastal sites. authors present a comparative study anaerobic biodegradation mineralization 15 N-nitro group isotopically labeled TNT RDX organic carbon-rich, fine-grained sediment with native microbial assemblages. Separate slurry experiments were carried...
Human locomotion is a complex process that shows some inherent synergies and coordination, also called inter-joint between the upper lower limbs. In this paper, we investigate use of Koopman operator to identify dynamic mapping an limb its contra-lateral in human locomotion. We perform analysis sagittal plane restrict study forward motion; more specifically, straight walking task at constant speed. canes as aids provide additional information about terrain enforce frequency locking body....
Abstract Examination of the partitioning explosives onto sediment in marine environments is critical to predict toxicological impacts worldwide explosive‐contaminated sites adjacent estuaries, wetlands, and coastal ocean. Marine sediments have been identified as enhanced munitions removal, yet most studies addressing these interactions focus on soils freshwater sediments. The present study measured kinetics 2,4,6‐trinitrotoluene (TNT) hexahydro‐1,3,5‐trinitro‐1,3,5‐triazine (RDX) sorption 2...
Avocado consumption is associated with numerous health benefits. Avocadyne a terminally unsaturated, 17-carbon long acetogenin found almost exclusively in avocados noted anti-leukemia and anti-viral properties. In this study, specific structural features such as the terminal triple bond, odd number of carbons, stereochemistry are shown to be critical its ability suppress mitochondrial fatty acid oxidation impart selective activity vitro vivo. Together, first study conduct structure-activity...