A5066190326- GaN-based semiconductor devices and materials
- Semiconductor materials and devices
- Plasma Diagnostics and Applications
- Electrocatalysts for Energy Conversion
- Biochemical and Molecular Research
- Gyrotron and Vacuum Electronics Research
- Silicon Carbide Semiconductor Technologies
- Metabolomics and Mass Spectrometry Studies
- Catalysts for Methane Reforming
- Calcium signaling and nucleotide metabolism
- ATP Synthase and ATPases Research
- Lanthanide and Transition Metal Complexes
- Laser and Thermal Forming Techniques
- Asphalt Pavement Performance Evaluation
- Machine Learning in Materials Science
- Carbon Dioxide Capture Technologies
- Electromagnetic Launch and Propulsion Technology
- Environmental remediation with nanomaterials
- Subcritical and Supercritical Water Processes
- Electrostatic Discharge in Electronics
- Pulsed Power Technology Applications
- Chalcogenide Semiconductor Thin Films
- Advanced MRI Techniques and Applications
- Biopolymer Synthesis and Applications
- Porphyrin and Phthalocyanine Chemistry
Johnson Matthey (United Kingdom)
2024
Catalyst
2024
Sandia National Laboratories
2005-2023
University of Minnesota
1977-2023
Sandia National Laboratories California
2021-2022
University of Nebraska–Lincoln
2013-2022
Portland State University
2012
The University of Sydney
1989
Commonwealth Scientific and Industrial Research Organisation
1979-1989
University of Tasmania
1989
Cyclic adenosine diphosphate (ADP)–ribose (cADPR) isomers are signaling molecules produced by bacterial and plant Toll/interleukin-1 receptor (TIR) domains via nicotinamide adenine dinucleotide (oxidized form) (NAD + ) hydrolysis. We show that v-cADPR (2′cADPR) v2-cADPR (3′cADPR) cyclized O-glycosidic bond formation between the ribose moieties in ADPR. Structures of 2′cADPR-producing TIR reveal conformational changes lead to an active assembly resembles those Toll-like adaptor domains....
The Pseudomonas syringae DC3000 type III effector HopAM1 suppresses plant immunity and contains a Toll/interleukin-1 receptor (TIR) domain homologous to immunity-related TIR domains of nucleotide-binding leucine-rich repeat receptors that hydrolyze nicotinamide adenine dinucleotide (NAD+ ) activate immunity. In vitro in vivo assays were conducted determine if hydrolyzes NAD+ the activity is essential for HopAM1's suppression contribution virulence. HPLC LC-MS utilized analyze metabolites...
Cu/ZnO/Al 2 O 3 catalysts used to synthesize methanol undergo extensive deactivation during use, mainly due sintering. Here, we report on formulations wherein has been substantially reduced by the targeted use of a small quantity Si-based promoter, resulting in accrued activity benefits that can exceed factor 1.8 versus unpromoted catalysts. This enhanced stability also provides longer lifetimes, up double prior generation Detailed characterization library aged allowed most important...
This study examined the effects of softening additives on moisture susceptibility recycled bituminous materials using chemical, mechanical, and imaging laboratory investigation methods. Two chemically different rejuvenators, one petroleum-tech (aromatic extracts) green-tech (tall oil), an amine-based warm mix additive were selected as such additives. For chemical investigation, two rejuvenators saturates-aromatics-resins-asphaltenes (SARA) analysis, Fourier-transform infrared (FT-IR)...
Stable isotopes are routinely employed by NMR metabolomics to highlight specific metabolic processes and monitor pathway flux. 13C-carbon 15N-nitrogen labeled nutrients convenient sources of isotope tracers commonly added as supplements a variety biological systems ranging from cell cultures animal models. Unlike 13C 15N, 31P-phosphorus is naturally abundant active that does not require an external supplemental source. To date, 31P has seen limited usage in because lack reference spectra,...
Graphene is a basic building block for many known and emerging carbon-based materials whose properties largely depend on the way how graphene structured at nanoscale. Synthesis of novel three-dimensional (3D) nanostructures would be an important advance fundamental research various applications. In this paper, we discuss possibility fabricating complex 3D by growing pre-synthesized nanostructured metal templates chemical vapor deposition (CVD) then etching away metal. proof-of-concept...
Accurate temperature measurement via magnetic resonance is valuable for both in vitro and vivo analysis of local tissue evaluating disease pathology medical interventions. 1H MRI-based thermometry used clinically but susceptible to error from field drift low sensitivity fatty requires a reference absolute determination. As an alternative, perfluorotributylamine (PFTBA), perfluorocarbon liquid 19F MRI thermometry, based on chemical shift responsiveness approaches the agents; however,...
GaN p‐n diodes were formed by selective area regrowth on freestanding substrates using a dry etch, followed post‐etch surface treatment to reduce etch‐induced defects, and subsequent into wells. Etched‐and‐regrown with 150 μm diameter achieved 840 V operation at 0.5 A/cm 2 reverse current leakage specific on‐resistance of 1.2 mΩ·cm . compared planar, regrown without etching the same wafer. Both types exhibited similar forward electrical characteristics, which indicate that defectivity...
Deep level defects in wide bandgap semiconductors, whose response times are the range of power converter switching times, can have a significant effect on efficiency. We use deep transient spectroscopy (DLTS) to evaluate such defect levels n-drift layer vertical gallium nitride (v-GaN) diodes with VBD ∼ 1500 V. DLTS reveals three energy that at ∼0.6 eV (highest density), ∼0.27 (lowest and ∼45 meV (a dopant level) from conduction band. Dopant extraction capacitance–voltage measurement tests...
The accuracy and ease of metabolite assignments from a complex mixture are expected to be facilitated by employing multispectral approach. two-dimensional (2D) 1H–13C heteronuclear single quantum coherence (HSQC) 2D 1H–1H–total correlation spectroscopy (TOCSY) the experiments commonly used for assignments. HSQC–TOCSY multiple-bond (HMBC) routinely natural products chemists but have seen minimal usage in metabolomics despite unique information, nearly complete 1H–1H spin systems provided...
Protein biochemistry protocols typically include disulfide bond reducing agents to guard against unwanted thiol oxidation and protein aggregation. Commonly used dithiothreitol, β-mercaptoethanol, glutathione, the tris(alkyl)phosphine compounds tris(2-carboxyethyl)phosphine (TCEP) tris(3-hydroxypropyl)phosphine (THPP). While studying catalytic activity of NAD(P)H-dependent enzyme Δ1-pyrroline-5-carboxylate reductase, we unexpectedly observed a rapid non-enzymatic chemical reaction between...
Abstract Cyclic ADP ribose (cADPR) isomers are important signaling molecules produced by bacterial and plant Toll/interleukin-1 receptor (TIR) domains via NAD + hydrolysis, yet their chemical structures unknown. We show that v-cADPR (2’cADPR) v2-cADPR (3’cADPR) cyclized O -glycosidic bond formation between the moieties in ADPR. Structures of (2’cADPR)-producing TIR reveal conformational changes required for active assembly resembles those Toll-like adaptor domains, mutagenesis data...
We report a nanowire–quantum-dot–polymer solar cell consisting of chemically treated CdSe quantum dot film deposited on n-type ZnO nanowires. The electron and hole collecting contacts are fluorine-doped tin-oxide/zinc oxide layer P3HT/Au layer. This device architecture allows for enhanced light absorption an efficient collection photogenerated carriers. A detailed analysis the chemical treatment dots, their deposition, necessary annealing processes discussed. find that surface dots with...
Triggers for high voltage (HV) switches have always been critical components reliable, efficient pulsed power systems because they control the timing synchronization and amplitude variation of multiple pulse forming lines that combine to produce total system output pulse. In future, role trigger are even more as shaped-pulses by independent individual or switch groups. Conventional require cables line-of-sight optics complicate design, demand space, extensive maintenance. With electrical...
Thiazolidine carboxylates such as thiazolidine-4-carboxylate (T4C) and thiazolidine-2-carboxylate (T2C) are naturally occurring sulfur analogues of proline. These compounds have been observed to both beneficial toxic effects in cells. Given that proline dehydrogenase has proposed be a key enzyme the oxidative metabolism thioprolines, we characterized T4C T2C substrates catabolic enzymes using utilization A (PutA), which is bifunctional with (PRODH) l-glutamate-γ-semialdehyde (GSALDH)...