A5012114671- Microbial Fuel Cells and Bioremediation
- Phosphorus and nutrient management
- Marine and coastal ecosystems
- Advanced battery technologies research
- Mine drainage and remediation techniques
- Geochemistry and Elemental Analysis
- Membrane-based Ion Separation Techniques
- Advanced oxidation water treatment
- Photosynthetic Processes and Mechanisms
- Graphite, nuclear technology, radiation studies
- Adsorption and biosorption for pollutant removal
- Electrocatalysts for Energy Conversion
- biodegradable polymer synthesis and properties
- Geophysical and Geoelectrical Methods
- Electrokinetic Soil Remediation Techniques
- Microbial Metabolic Engineering and Bioproduction
- Coastal wetland ecosystem dynamics
- Radioactive element chemistry and processing
- Geochemistry and Geologic Mapping
- Photodynamic Therapy Research Studies
- Algal biology and biofuel production
- Soil and Water Nutrient Dynamics
- Energetic Materials and Combustion
- Advanced Chemical Physics Studies
- Coagulation, Bradykinin, Polyphosphates, and Angioedema
University of Alberta
2023
University of Tübingen
2019-2020
University of Delaware
2017-2020
Huazhong Agricultural University
2017
Redox-active organic molecules such as anthraquinone-2,6-disulfonate (AQDS) and natural matter (NOM) can act electron shuttles thus facilitating transfer from Fe(III)-reducing bacteria (FeRB) to terminal acceptors Fe(III) minerals. In this research, we examined the length scale over which shuttling occur. We present results agar-solidified experimental incubations, containing either AQDS or NOM, where FeRB were physically separated ferrihydrite goethite by 2 cm. Iron speciation concentration...
The mechanism of long-distance electron transfer via redox-active particulate natural organic matter (NOM) is still unclear, especially considering its aggregated nature and the resulting low diffusivity quinone- hydroquinone-containing molecules. Here we conducted microbial iron(III) mineral reduction experiments in which anthraquinone-2,6-disulfonate (AQDS, a widely used analogue for molecules NOM) was immobilized agar to achieve spatial separation between iron-reducing bacteria...
Electroactive microbes can conduct extracellular electron transfer and have the potential to be applied as a bioresource regulate soil geochemical properties microbial communities. In this study, we incubated Fe-limited Fe-enriched farmland together with electroactive for 30 days; both soils were common iron mineral, ferrihydrite. Our results indicated that exogenous decreased pH, total organic carbon (TOC), nitrogen (TN) but increased conductivity promoted Fe(III) reduction. The addition of...
Abstract. Soil organic matter (SOM) is redox-active, can be microbially reduced, and transfers electrons in an abiotic reaction to Fe(III) minerals, thus serving as electron shuttle. The standard procedure isolate (OM) from soil involves the use of alkaline acidic solutions separation humic acids (HAs) fulvic (FAs). This process potentially leads unwanted changes SOM chemical redox properties. To determine effects extraction conditions on electron-shuttling properties extracts, we prepared...
Natural organic matter (NOM) dominated electron transfer has been widely studied in wetlands, freshwater sediments, and peatlands, which a diffusion-electron hopping mechanism consisting of dissolved (DOM) particulate (POM) was found to mediate over centimeter (cm) distances. However, it remains unclear whether such long-distance also occurs when NOM is associated with minerals, form organo-mineral associations (OMAs) thus are less mobile accessible. In this study, we investigated the roles...
Abstract Understanding phosphorus (P) availability and its control on eutrophication in the Chesapeake Bay is complicated by variable sources biogeochemical reactions transforming P forms. We investigated seasonal spatial variability limitation biological utilization using nutrient stoichiometry (of both dissolved particulate forms), phosphate oxygen isotope ratios, alkaline phosphatase activity at three sites along salinity gradient. demonstrate that ratios can be used as indicators of...
Abstract Particulate phosphorus (PP) in the water column is an essential component of (P) cycling Chesapeake Bay because P often limits primary productivity, yet its composition and transformation remain undercharacterized. To understand mobilization PP sequestration column, we studied seasonal variations particulate organic inorganic species at three sites Bay, using chemical extractions, 1‐D ( 31 P) 2‐D 1 H‐ NMR spectroscopies, electron microprobe analyses. Our results suggest that average...
Polyphosphate (poly-P) is a chain of phosphate moieties linked through high-energy phosphoanhydride bond, and it plays an important role in regulatory functions prokaryotic cells. Isotope effects bacterial synthesis degradation poly-P may provide insights into the roles environmental phosphorus (P) cycling. In this research, we investigated enzymatic by cell-free enzyme solutions cells (Escherichia coli JM103 Pseudomonas putida KT2440) analyzed oxygen isotope ratios (δ18OP), activity,...
Abstract. Soil organic matter (SOM), including humic substances (HS), is redox-active, can be microbially reduced, and transfers electrons in an abiotic reaction to Fe(III) minerals thus serving as electron shuttle. The standard procedure extract HS from soil separate them into acids (HA) fulvic (FA) involves alkaline acidic solutions potentially leading unwanted changes SOM chemical redox properties. To determine the effects of extraction conditions on shuttling properties extracts, we...