A5066134262- Soil Geostatistics and Mapping
- Geochemistry and Geologic Mapping
- Soil Moisture and Remote Sensing
- Radioactive element chemistry and processing
- Soil and Unsaturated Flow
- Carbohydrate Chemistry and Synthesis
- Nuclear and radioactivity studies
- Mineral Processing and Grinding
- Spectroscopy and Chemometric Analyses
- Lanthanide and Transition Metal Complexes
- Remote Sensing in Agriculture
- Soil Carbon and Nitrogen Dynamics
- Groundwater flow and contamination studies
- Polymer crystallization and properties
- Organometallic Complex Synthesis and Catalysis
- Nuclear Materials and Properties
- Diet, Metabolism, and Disease
- Geology and Paleoclimatology Research
- Radioactive contamination and transfer
- Particle accelerators and beam dynamics
- Smart Agriculture and AI
- Polymer Nanocomposites and Properties
- Gyrotron and Vacuum Electronics Research
- Graphite, nuclear technology, radiation studies
- Catalysis and Oxidation Reactions
Colorado College
2024
Washington State University
2011-2021
University of Washington
2019
North Dakota State University
2017
Université de Lorraine
2014
University of Oxford
1979-2009
Prolysis (United Kingdom)
2009
Dartmouth College
2004-2007
Montana State University
2003-2007
Landscape Institute
2006
Soil provides ecosystem services, supports human health and habitation, stores carbon regulates emissions of greenhouse gases. Unprecedented pressures on soil from degradation urbanization are threatening agro-ecological balances food security. It is important that we learn more about to sustainably manage preserve it for future generations. To this end, developed analyzed a global visible–near infrared (vis–NIR) spectral library. currently the largest most diverse database its kind. We show...
The decrease in plasticity that occurs the central nervous system during postnatal development is accompanied by appearance of perineuronal nets (PNNs) around cell body and dendrites many classes neuron. These structures are composed extracellular matrix molecules, such as chondroitin sulfate proteoglycans (CSPGs), hyaluronan (HA), tenascin-R, link proteins. To elucidate role played neurons glial cells constructing PNNs, we studied expression PNN components adult rat cerebellum...
Vascular smooth muscle cells (VSMC) in mature, normal blood vessels exhibit a differentiated, quiescent, contractile morphology, but injury induces phenotypic modulation toward proliferative, dedifferentiated, migratory phenotype with upregulated extracellular matrix protein synthesis (synthetic phenotype), which contributes to intimal hyperplasia. The mTOR (the mammalian target of rapamycin) pathway inhibitor rapamycin inhibits hyperplasia animal models and human clinical trials. We report...
Visible and near‐infrared (VNIR, 400–2500 nm) diffuse reflectance spectroscopy (DRS) is a rapid, proximal‐sensing method that has proven useful in quantifying constituents of dried ground soil samples. Very little known, however, about how DRS performs field setting on soils scanned situ. The overall goal this research was to evaluate the feasibility VNIR‐DRS for situ quantification clay content from variety parent materials. Seventy‐two cores were obtained six fields Erath Comanche...
The phenotypic plasticity of mature vascular smooth muscle cells (VSMCs) facilitates angiogenesis and wound healing, but VSCM dedifferentiation also contributes to pathologies such as intimal hyperplasia. Insulin/insulin-like growth factor I (IGF-I) is unique among factors in promoting VSMC differentiation via preferential activation phosphatidylinositol 3-kinase (PI3K) Akt. We have previously reported that rapamycin promotes by inhibiting the mammalian target (mTOR) S6K1. Here, we show...
Conservation tillage practices often leave appreciable amounts of crop residues on soil surfaces after harvesting and generally improve structure, enhance organic C (SOC) content, reduce erosion. Remote sensing methods have shown great promise in efficiently estimating residue cover, thus inferring intensity. Furthermore, these intensity estimates can be used models. Reflectance spectra more than 4200 soils 80 were measured the laboratory across 350‐ to 2500‐nm wavelength region. Six remote...
Spectral indices (SI) derived from crop reflectance data are sensitive to chlorophyll a and b content (Chl). However, the SI–Chl relationship might be confounded by variation in leaf area index (LAI) soil background reflectance, especially semiarid environments where water determines growth. This study evaluated sensitivity of SI how this may affect overall performance for ground‐based sensing Chl dryland wheat ( Triticum aestivum L.). Selected were computed spectra simulated PROSPECT‐SAIL...
Core Ideas First rigorous integration of VisNIR and LIBS spectroscopic techniques for soil profile C measurement. Field‐moist intact cores scanned with simulating in situ measurements. Combined VisNIR‐LIBS wavelengths selected by MRCE were split nearly equally between sensors, suggesting molecular elemental information was successfully integrated predicting TC, IC, SOC. Stoichiometric relationships emissions are more strongly correlated to IC concentration than carbonate absorptions VisNIR....
Using a simple model of turbulence simulation is made the interaction an ensemble discrete solid or liquid particles and fluid continuum. Two notional one - dimensional systems are considered: which unbounded other bounded by perfectly absorbing walls. The results for system indicate that at sufficiently long times may disperse more rapidly than elements study on system, however, shows in practice ratio particle relaxation time to mean residence be such this rapid dispersion will not...
Laser-induced breakdown spectroscopy (LIBS) is an emerging elemental analysis technology with the potential to provide rapid, accurate, and precise of soil constituents. We evaluated accuracy LIBS in measuring profile C for field-moist, intact cores by interrogating 78 from three Montana agricultural fields. Samples each core were analyzed laboratory total (TC), inorganic (IC), organic (SOC). Partial least squares 2 (PLS2) regression calibration models derived using 58 (227 samples)...
Laser-induced breakdown spectroscopy (LIBS) provides a potential method for rapid, in situ soil C measurement. In previous research on the application of LIBS to intact cores, we hypothesized that ultraviolet (UV) spectrum (200-300 nm) might not provide sufficient elemental information reliably discriminate between organic (SOC) and inorganic (IC). this study, using custom complete (245-925 core-scanning instrument, analyzed 60 cores from six wheat fields. Predictive multi-response partial...