A5084861789- Climate change and permafrost
- Mercury impact and mitigation studies
- Methane Hydrates and Related Phenomena
- Atmospheric and Environmental Gas Dynamics
- Hydrocarbon exploration and reservoir analysis
- Petroleum Processing and Analysis
- Microbial Community Ecology and Physiology
- Subcritical and Supercritical Water Processes
- Heavy Metal Exposure and Toxicity
- Cryospheric studies and observations
- Indigenous Studies and Ecology
- Soil and Water Nutrient Dynamics
- Peatlands and Wetlands Ecology
- Origins and Evolution of Life
- Catalysis and Oxidation Reactions
- Soil Carbon and Nitrogen Dynamics
- Analytical Chemistry and Chromatography
- Water Treatment and Disinfection
- Geochemistry and Elemental Analysis
- Astro and Planetary Science
- Groundwater and Isotope Geochemistry
- Planetary Science and Exploration
- Aquatic Ecosystems and Phytoplankton Dynamics
- Oxidative Organic Chemistry Reactions
- Isotope Analysis in Ecology
Oakland University
2016-2025
Beijing University of Chemical Technology
2025
Oak Ridge National Laboratory
2015-2019
Rochester College
2016
Arizona State University
2011-2015
Delaware State University
2009
Microbial methylation and demethylation are two competing processes controlling the net production bioaccumulation of neurotoxic methylmercury (MeHg) in natural ecosystems. Although mercury (Hg) by anaerobic microorganisms aerobic Hg-resistant bacteria have both been extensively studied, little attention has given to MeHg degradation bacteria, particularly iron-reducing bacterium Geobacter bemidjiensis Bem. Here we report, for first time, that strain G. Bem can mediate a suite Hg...
Molecular composition of the Arctic soil organic carbon (SOC) and its susceptibility to microbial degradation are uncertain due heterogeneity unknown SOC compositions. Using ultrahigh-resolution mass spectrometry, we determined compositional changes extractable dissolved matter (EDOM) in an anoxic warming incubation experiment (up 122 days) with a tundra from Alaska (United States). EDOM was extracted 10 mM NH4HCO3 both organic- mineral-layer soils during at −2 8 °C. Based on their O:C H:C...
Microbial residues contribute to the long-term stabilization of carbon in entire soil profile, helping regulate climate planet; however, how sensitive these are climatic seasonality remains virtually unknown, especially for deep soils across environmental gradients. Here, we investigated changes microbial along profiles (0-100 cm) from 44 typical ecosystems with a wide range climates (~3100 km transects China). Our results showed that account larger portion deeper (60-100 vs. shallower (0-30...
The neurotoxin methylmercury (MeHg) is produced mainly from the transformation of inorganic Hg by microorganisms carrying hgcAB gene pair. Paddy soils are known to harbor diverse microbial communities exhibiting varying abilities in methylating Hg, but their distribution and environmental drivers remain unknown at a large spatial scale. Using hgcA amplicon sequencing, this study examined Hg-methylating major rice-producing paddy across transect ∼3600 km an altitude ∼1300 m China. Results...
Abstract Paddy fields are hotspots of microbial denitrification, which is typically linked to the oxidation electron donors such as methane (CH 4 ) under anoxic and hypoxic conditions. While several anaerobic methanotrophs can facilitate denitrification intracellularly, whether how aerobic CH couples with in paddy remains virtually unknown. Here we combine a ~3300 km field study across main rice-producing areas China 13 -DNA-stable isotope probing (SIP) experiments investigate role soil...
Abstract Arctic tundra soils store a large quantity of organic carbon that is susceptible to decomposition and release the atmosphere as methane (CH 4 ) dioxide (CO 2 under warming climate. Anaerobic processes generate CH CO remain unclear because previous studies have focused on aerobic pathways. To predict releases from soils, it necessary identify pathways soil matter anoxic conditions are prevalent in ecosystems. Here molecular spectroscopic techniques were used monitor biological...
Research Article| January 01, 2013 Thermodynamics of Organic Transformations in Hydrothermal Fluids Everett L. Shock; Shock 1GEOPIG, School Earth & Space Exploration, Arizona State University, Tempe, 85287, U.S.A.2Department Chemistry Biochemistry, U.S.A. Everett.Shock@asu.edu Search for other works by this author on: GSW Google Scholar Peter Canovas; Canovas Ziming Yang; Yang 2Department Grayson Boyer; Boyer Kristin Johnson; Johnson Kirtland Robinson; Robinson Kristopher Fecteau; Fecteau...
Rice ingestion has been recognized as an important route of dietary exposure to neurotoxic methylmercury (MeHg) that is commonly synthesized in rice paddy soils. Although Hg methylators are known regulate soil MeHg formation, the effect non-Hg methylating communities on production remains unclear. Here, we collected 141 samples from main rice-producing areas across China identify associations between bacterial community composition (including both and putative methylators) production....
Soil stores a large amount of mercury (Hg) that has adverse effects on human health and ecosystem safety. Significant uncertainties still exist in revealing environmental drivers soil Hg accumulation predicting global distribution owing to the lack field data from standardized analyses. Here, we conducted survey explored holistic understanding multidimensional surface soils. content soils our ranges 3.8 618.2 μg kg-1 with an average 74.0 across globe. Atmospheric deposition, particularly...
Abstract. Rapid warming of Arctic ecosystems accelerates microbial decomposition soil organic matter and leads to increased production carbon dioxide (CO2) methane (CH4). CH4 oxidation potentially mitigates emissions from permafrost regions, but it is still highly uncertain whether soils in high-latitude will function as a net source or sink for response rising temperature associated hydrological changes. We investigated potential permafrost-affected degraded ice-wedge polygons on the Barrow...
Continuous greenhouse gas monitoring at sub-zero temperatures is needed for emission in cold environments such as the Arctic tundra. This work reports a single-frequency electrochemical impedance sensing (SF-EIS) method real-time continuous of carbon dioxide (CO2) wide range (-15 to 40 °C) by using robust ionic liquid (IL) materials and noninvasive, low-power, low-cost readout mechanisms since they cause minimal changes interface, avoiding baseline change long-term sensing. In addition,...
The 2-week, virtual Future of the Search for Life science and engineering workshop brought together more than 100 scientists, engineers, technologists in March April 2022 to provide their expert opinion on interconnections between life-detection technology. Participants identified advances measurement sampling technologies they believed be necessary perform situ searches life elsewhere our Solar System, 20 years or future. Among suggested measurements these searches, those pertaining three...
Abstract In this article, the mechanical properties of carbon fiber reinforced polypropylene (CF/PP) composites at different (CF) mass fractions were systematically investigated. A comprehensive examination is provided through integration experimental testing, numerical simulation, and theoretical analysis, revealing enhancement effects CF on (PP) matrix across multiple scales. Experimental results demonstrated that incorporation significantly impedes crack propagation enhances fracture...
Hydrothermal systems provide a unique habitat for the subsurface biosphere, and possibly, origin of life. Amides are fundamental to hydrothermal organic geochemistry deep biology research, in large part because their involvement metabolism, such as forms peptides proteins, also participation nitrogen cycle potential role chemistry amides is great interest astrobiology research it may reveal formation pathways biomolecules space outside Earth. Here, we describe nonmineral-catalyzed synthetic...