A5012088696- Metal Extraction and Bioleaching
- Minerals Flotation and Separation Techniques
- Geochemistry and Geologic Mapping
- Mine drainage and remediation techniques
- Geomagnetism and Paleomagnetism Studies
- Calcium Carbonate Crystallization and Inhibition
- Microbial Applications in Construction Materials
- Geophysical and Geoelectrical Methods
- Mineral Processing and Grinding
- Mining and Resource Management
- Enzyme function and inhibition
- Methane Hydrates and Related Phenomena
- Geology and Paleoclimatology Research
- High-pressure geophysics and materials
- Iron oxide chemistry and applications
- Mining Techniques and Economics
- Geological Studies and Exploration
- Iron Metabolism and Disorders
- Microbial Community Ecology and Physiology
- Geological and Geochemical Analysis
- X-ray Diffraction in Crystallography
- Mineralogy and Gemology Studies
- Enzyme Production and Characterization
- Iron and Steelmaking Processes
- Hydrocarbon exploration and reservoir analysis
University of Minnesota
2020-2025
Twin Cities Orthopedics
2025
Mineral Resources
2023
Geology, Energy and Minerals Science Center
2023
United States Geological Survey
2023
Microorganisms are important catalysts for the oxidation of reduced inorganic sulfur compounds. One environmentally source is metal sulfide minerals that occur in economic mineral deposits and mine waste. Previous research found Sulfuriferula spp. were abundant active long-term weathering experiments with simulated waste rock tailings from Duluth Complex, Northern Minnesota. We therefore isolated several strains these characterized their metabolic genomic properties to provide insight into...
Summary Microbial precipitation of calcium carbonate is a widespread environmental phenomenon that has diverse engineering applications, from building and soil restoration to carbon sequestration. Urease‐mediated ureolysis CO 2 (de)hydration by carbonic anhydrase (CA) are known for their potential precipitate minerals, yet many microbial community studies rely on marker gene or metagenomic approaches unable determine in situ activity. Here, we developed fast cost‐effective tests the field...
Oxidative mineral growth of goethite (α-FeOOH) on hematite (α-Fe2O3) nanoparticles during the oxidation adsorbed Fe(II) is thermodynamically controlled by surface characteristics and solution conditions. Here, impact added organic carbon (OC) reactivity ultrafine particles evaluated. For batch reactors using 0.007 m2/mL hematite, observed rate constant 4-chloronitrobenzene reduction to 4-chloroaniline decreases 4× with addition 5 ppm OC from Suwanee River natural matter (SRNOM) 5× 10 μM...
No matter how quiet and pristine a cave setting may appear, all speleothems contain assemblages of magnetic minerals. These iron oxide minerals are derived largely from overlying soils, though minor fractions come the residuum dissolved bedrock, reworked sediment carried by episodic floods, geomicrobiological activity, even windblown dust. Regardless their origin, these become aligned with Earth’s ambient field before they fixed within speleothem’s growing carbonate matrix. Here, we describe...
Earth and Space Science Open Archive This preprint has been submitted to is under consideration at Journal of Geophysical Research - Solid Earth. ESSOAr a venue for early communication or feedback before peer review. Data may be preliminary.Learn more about preprints preprintOpen AccessYou are viewing the latest version by default [v1]The importance temperature-dependent diffraction data in understanding magnetic changes across pyrrhotite λ-transition.AuthorsKathryn KikuHobartiDJoshua...
ABSTRACT Microbial precipitation of calcium carbonate has diverse engineering applications, from building and soil restoration, to carbon sequestration. Urease-mediated ureolysis CO 2 (de)hydration by carbonic anhydrase (CA) are known for their potential precipitate minerals, yet many microbial community studies rely on marker gene or metagenomic approaches that unable determine in situ activity. Here, we developed fast cost-effective tests the field detection urease CA activity using...
The Duluth Complex (DC) contains sulfide-rich magmatic intrusions that represent one of the largest known economic deposits copper, nickel, and platinum group elements. Previous work showed microbial communities associated with experimentally-weathered DC waste rock tailings were dominated by uncultivated taxa organisms not typically mine waste. However, those experiments designed for kinetic testing do necessarily conditions expected long-term environmental weathering. We used 16S rRNA gene...
ABSTRACT The Duluth Complex, Northeastern Minnesota, contains sulfide-rich magmatic intrusions that, collectively, represent one of the world’s largest known economic deposits copper, nickel, and platinum group elements (Cu-Ni-PGEs). Previous work showed that microbial communities associated with experimentally-weathered Complex waste rock tailings were dominated by uncultivated taxa other populations not typically mine waste. However, those experiments designed for kinetic testing do...