The Material Properties Of Cssnbr3 And Csbr:Sn-1% And Their Potential As Scintillator Detector Material, 2010 Air Force Institute of Technology
The Material Properties Of Cssnbr3 And Csbr:Sn-1% And Their Potential As Scintillator Detector Material, Neal B. Kleinschmidt
Theses and Dissertations
The search for superior nuclear radiation detection materials is ongoing. Current scintillator materials using Thallium doped Sodium Iodide or Cesium Iodide are the benchmarks for ease of use and quick identification of isotope species. This research aims to explore Cesium Bromide doped with 1% molar tin (CsBr:Sn-1%) and Cesium Tin Bromide (CsSnBr3) as candidate materials for a new scintillator. The techniques of Extended X-Ray Absorption Fine Structure (EXAFS), X-Ray Absorption Near Edge Structure (XANES) and Cathodoluminescence are used to determine the suit- ability of CsSnBr3 and CsBr:Sn-1% with Sn4+ as a potential scintillator materials and explore their …
Atomic Details Of Near-Transition State Conformers For Enzyme Phosphoryl Transfer Revealed By Mgf3− Rather Than By Phosphoranes, 2010 University of Sheffield
Atomic Details Of Near-Transition State Conformers For Enzyme Phosphoryl Transfer Revealed By Mgf3− Rather Than By Phosphoranes, Nicola J. Baxter, Matthew W. Bowler, Tooba Alizadeh, Matthew J. Cliff, Andrea M. Hounslow, Bin Wu, David B. Berkowitz, Nicholas H. Williams, G. Michael Blackburn, Jonathan P. Waltho
David Berkowitz Publications
Prior evidence supporting the direct observation of phosphorane intermediates in enzymatic phosphoryl transfer reactions was based on the interpretation of electron density corresponding to trigonal species bridging the donor and acceptor atoms. Close examination of the crystalline state of β-phosphoglucomutase, the archetypal phosphorane intermediate-containing enzyme, reveals that the trigonal species is not PO−3 , but is MgF−3 (trifluoromagnesate). Although MgF−3 complexes are transition state analogues rather than phosphoryl group transfer reaction intermediates, the presence of fluorine nuclei in near-transition state conformations offers new opportunities to explore the nature of the interactions, in particular the independent measures of local electrostatic and …
Depositional Ice Nucleation On Solid Ammonium Sulfate And Glutaric Acid Particles, 2010 University of Colorado, Boulder
Depositional Ice Nucleation On Solid Ammonium Sulfate And Glutaric Acid Particles, K. J. Baustian, M. E. Wise, M. A. Tolbert
CUP Faculty Research
Heterogeneous ice nucleation on solid ammonium sulfate and glutaric acid particles was studied using optical microscopy and Raman spectroscopy. Optical microscopy was used to detect selective nucleation events as water vapor was slowly introduced into an environmental sample cell. Particles that nucleated ice were dried via sublimation and examined in detail using Raman spectroscopy. Depositional ice nucleation is highly selective and occurred preferentially on just a few ammonium sulfate and glutaric acid particles in each sample. For freezing temperatures between 214 K and 235 K an average ice saturation ratio of S = 1.10±0.07 for solid ammonium sulfate was observed. …
Reactive Layer-By-Layer Assembly Of Suspended Thin Films And Semipermeable Membranes At Interfaces Created Between Aqueous And Organic Phases, 2010 University of Wisconsin-Madison
Reactive Layer-By-Layer Assembly Of Suspended Thin Films And Semipermeable Membranes At Interfaces Created Between Aqueous And Organic Phases, Maren E. Buck, David M. Lynn
Chemistry: Faculty Publications
Thin films of polymer suspended across the openings of pores, channels, and microcavities are of interest in a broad range of fundamental and applied contexts. A "reactive" layer-by-layer approach Is demonstrated for the fabrication of suspended thin films and semipermeable membranes that makes use of liquid/ liquid interfaces created between immiscible aqueous and organic phases as templates for film fabrication (see image). (Figure Presented).
Roles Of Serine 101, Histidine 310 And Valine 464 In The Reaction Catalyzed By Choline Oxidase From Arthrobacter Globiformis, 2010 Georgia State University
Roles Of Serine 101, Histidine 310 And Valine 464 In The Reaction Catalyzed By Choline Oxidase From Arthrobacter Globiformis, Steffan Finnegan
Chemistry Dissertations
The enzymatic oxidation of choline to glycine betaine is of interest because organisms accumulate glycine betaine intracellularly in response to stress conditions, as such it is of potential interest for the genetic engineering of crops that do not naturally possess efficient pathways for the synthesis of glycine betaine, and for the potential development of drugs that target the glycine betaine biosynthetic pathway in human pathogens. To date, one of the best characterized enzymes belonging to this pathway is the flavin-dependent choline oxidase from Arthrobacter globiformis. In this enzyme, choline oxidation proceeds through two reductive half-reactions and two oxidative half-reactions. In …
Time-Resolved Infrared Spectroscopy And Density Functional Theory Study Of Weak Interactions Of Metal Carbonyls And Organic Solvents, 2010 Brigham Young University - Provo
Time-Resolved Infrared Spectroscopy And Density Functional Theory Study Of Weak Interactions Of Metal Carbonyls And Organic Solvents, Carolyn Evans Sheffield
Theses and Dissertations
Pulsed laser flash photolysis of M(CO)6 (M = Cr, W) in cyclohexane with a small amount of benzene results in three sequential reactions. The first is the photodissociation of the parent to yield a M(CO)5:C6H12 complex, which takes place faster than the time resolution of our experiments. The second reaction is the replacement of the cyclohexane ligand with benzene to form a M(CO)5:C6H6 complex, in which benzene is coordinated to the metal via one side of the ring. This complex then falls apart in solution as M(CO)5 coordinates with a trace impurity in the solution that is likely water. Kinetic …
Metals: Typical And Less Typical, Transition And Inner Transition, 2010 Laval University, Quebec City, Canada
Metals: Typical And Less Typical, Transition And Inner Transition, Fathi Habashi
Fathi Habashi
While most chemists agree on what is a metal and what is a non-metal there is a disagreement with respect to what is a metalloid and what is a transition metal. It is believed that this problem can be solved if two new terms are adopted: typical and less typical metals. These new terms will also help reconcile the European Periodic Table versus the North American regarding numbering of groups as well as the IUPAC numbering which could be as well abandoned in favour of group names as will be shown in the manuscript.
An Electrochemical Cell For The Efficient Turn Around Of Wafer Working Electrodes, 2010 Hope College
An Electrochemical Cell For The Efficient Turn Around Of Wafer Working Electrodes, Nicholas Wozniak, Alyssa Frey, Lucas Osterbur, Timothy Boman, Jennifer R. Hampton
Faculty Publications
We present a new design for an electrochemical cell for use with wafer working electrodes. The key feature of the design is the use of half turn thumb screws to form a liquid-tight seal between an o-ring and the sample surface. The assembly or disassembly of the cell requires a half turn of each thumb screw, which facilitates the quick turn around of wafer samples. The electrochemical performance of the cell is demonstrated by cyclic voltammetry and double step chronoamperometry measurements of the ferricyanide/ferrocyanide couple.
Utilizing Service Learning In The Analytical Chemistry Classroom, 2010 St. John Fisher University
Utilizing Service Learning In The Analytical Chemistry Classroom, Kimberly D. Chichester, Colleen Dugan, Amanda Lewis, Maryann Herman, Irene Kimaru
Chemistry Faculty/Staff Publications
Service learning has been incorporated into the Analytical Chemistry Laboratory to give students a real world sampling experience including both soil and water, alongside professionals in their fields. Analysis of the soil and water includes metals, suspended solids, phosphorus and nitrogen containing compounds requiring knowledge of several different instrumental and wet chemical techniques. Most educational experiences do not afford students the chance to see the real world applications of their classroom knowledge, but with the service learning aspects this deficiency has been resolved. In the soil experience, students provide homeowners from the Highland Park and South Wedge neighbors with lead …
Quasispecies-Like Behavior Observed In Catalytic Rna Populations Evolving In A Test Tube, 2010 Portland State University
Quasispecies-Like Behavior Observed In Catalytic Rna Populations Evolving In A Test Tube, Carolina Diaz Arenas, Niles Lehman
Chemistry Faculty Publications and Presentations
Background: During the RNA World, molecular populations were probably very small and highly susceptible to the force of strong random drift. In conjunction with Muller's Ratchet, this would have imposed difficulties for the preservation of the genetic information and the survival of the populations. Mechanisms that allowed these nascent populations to overcome this problem must have been advantageous.
Results: Using continuous in vitro evolution experimentation with an increased mutation rate imposed by MnCl2, it was found that clonal 100-molecule populations of ribozymes clearly exhibit certain characteristics of a quasispecies. This is the first time this has been seen …
Nuclear Quantum Effects In The Structure And Lineshapes Of The N2 Near-Edge X-Ray Absorption Fine Structure Spectrum, 2010 University of Texas Rio Grande Valley
Nuclear Quantum Effects In The Structure And Lineshapes Of The N2 Near-Edge X-Ray Absorption Fine Structure Spectrum, Shervin Fatehi, Craig P. Schwartz, Richard J. Saykally, David Prendergast
Chemistry Faculty Publications and Presentations
We study the relative ability of several models of x-ray absorption spectra to capture the Franck–Condon structure apparent from an experiment on gaseous nitrogen. In doing so, we adopt the Born–Oppenheimer approximation and a constrained density functional theory method for computing the energies of the x-ray-excited molecule. Starting from an otherwise classical model for the spectrum, we systematically introduce more realistic physics, first by substituting the quantum mechanical nuclear radial density in the bond separation R for the classical radial density, then by adding the effect of zero-point energy and other level shifts, and finally by including explicit rovibrational quantization …
Intermolecular Dehydrative Coupling Reaction Of Arylketones With Cyclic Alkenes Catalyzed By A Well-Defined Cationic Ruthenium-Hydride Complex: A Novel Ketone Olefination Method Via Vinyl C–H Bond Activation, 2010 Marquette University
Intermolecular Dehydrative Coupling Reaction Of Arylketones With Cyclic Alkenes Catalyzed By A Well-Defined Cationic Ruthenium-Hydride Complex: A Novel Ketone Olefination Method Via Vinyl C–H Bond Activation, Chae S. Yi, Do W. Lee
Chemistry Faculty Research and Publications
The cationic ruthenium−hydride complex [(η6-C6H6)(PCy3)(CO)RuH]+BF4− was found to be a highly effective catalyst for the intermolecular olefination reaction of aryl ketones with cycloalkenes. The preliminary mechanistic analysis revealed that an electrophilic ruthenium−vinyl complex is the key species for mediating both vinyl C−H bond activation and the dehydrative olefination steps of the coupling reaction.
Microscopic And Spectroscopic Studies Of Thermally Enhanced Electrospun Pmma Micro- And Nanofibers, 2010 The University of Texas Rio Grande Valley
Microscopic And Spectroscopic Studies Of Thermally Enhanced Electrospun Pmma Micro- And Nanofibers, Sean Pelfrey, Travis Cantu, Michael R. Papantonakis, Duane L. Simonson, R. Andrew Mcgill, Javier Macossay-Torres
Chemistry Faculty Publications and Presentations
Carbon nanofibers (CNFs) have been incorporated into poly(methyl methacrylate) (PMMA) through electrospinning. The resulting micro- and nanofibers have been characterized by Scanning Electron Microscopy (SEM), which confirmed fiber formation and demonstrated a core-sheath structure of the PMMA fibers. Thermogravimetric Analysis (TGA) was used to obtain the thermal properties of the materials, indicating an enhancement in the thermal properties of the composite fibers. In addition, Fourier Transform Infrared Spectroscopy (FTIR) was utilized to investigate the interactions of PMMA micro- and nanofibers with CNFs, demonstrating the preferred sites of intermolecular interactions between the polymer matrix and the filler.
Targeting Prostate Cancer Cells In Vivo Using A Rapidly Internalizing Novel Human Single-Chain Antibody Fragment., 2010 Northeastern University
Targeting Prostate Cancer Cells In Vivo Using A Rapidly Internalizing Novel Human Single-Chain Antibody Fragment., Arun K. Iyer
Arun Iyer
Human antibodies targeting prostate cancer cell surface epitopes may be useful for imaging and therapy. The objective of this study was to evaluate the tumor targeting of an internalizing human antibody fragment, a small-size platform, to provide high contrast in a mouse model of human prostate carcinoma. METHODS: A prostate tumor-targeting single-chain antibody fragment (scFv), UA20, along with a nonbinding control scFv, N3M2, were labeled with (99m)Tc and evaluated for binding and rapid internalization into human prostate tumor cells in vitro and tumor homing in vivo using xenograft models. For the in vitro studies, the labeled UA20 scFv was incubated …
Beethoven: Patriotism And Social Justice, 2010 Laval University, Quebec City, Canada
Beethoven: Patriotism And Social Justice, Fathi Habashi
Fathi Habashi
The Synthesise Of Electron-Conducting Redox Hydrogel And Its Application In Microbial Fuel Cell, 2010 College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 730042,Hubei,China;
The Synthesise Of Electron-Conducting Redox Hydrogel And Its Application In Microbial Fuel Cell, Kai-Peng Wang, Sheng-Li Chen
Journal of Electrochemistry
Efficient electron transfer between the microbe and the anode is key for the electricity generation in Microbial fuel cell(MFC).Through the modification of anode,the rate of electron transfer can be accelerated,therefore the performance of MFC can be enhanced.In this paper,we report the synthesis of a type of electronconducting and bio-compatible redox hydrogel and its application.The hydrogel consists of poly(4-vinylpyridine) as backbone and neutral red as the redox center.By immobiliazing neutral red on the backbone through covalent bond,the secondary contamination due to the soluble redox mediator to external environment can be prevented.MFCs using the hydrogel-modified carbon anode significantly exhibit shorter acclimation period,and …
Preparation And Electrochemical Behavior Of Li_4ti_5o_(12) Nanosheets As Anode Material For Lithium Ion Battery, 2010 School of Chemistry and Chemical Technology,Shanghai Jiao Tong University,Shanghai 200240,China;
Preparation And Electrochemical Behavior Of Li_4ti_5o_(12) Nanosheets As Anode Material For Lithium Ion Battery, Yi-Fei Wang, Yu-Feng Tang, Zheng Qiu, Li Yang
Journal of Electrochemistry
Spinel lithium titanate(Li4Ti5O12) nanosheets with a size range of 200 ~400 nm were synthesized by hydrothermal process from the amorphous hydrous titanium oxide precursors.The as-prepared products were characterized by X-ray powder diffraction(XRD),scanning electron microscopy(SEM) and transmission electron microscopy(TEM).The electrochemical behaviors of Li4Ti5O12 electrode in conventional organic electrolyte and ionic liquid electrolyte were investigated by using cyclic voltammetry,galvanostatic charge-discharge and AC impedance techniques.The experimental results indicate that the as-prepared nanostructured Li4Ti5O12,evaluated as anode material,exhibited good reversibility and cycle performance.It is expected to be a potential anode material for commerical battery applications.
Selective Regulation Of Aromatase Expression For Drug Discovery, 2010 Ohio State University
Selective Regulation Of Aromatase Expression For Drug Discovery, Robert W. Brueggemeier, Bin Su, Michael V. Darby, Yasuro Sugimoto
Chemistry Faculty Publications
Aromatase is a particularly attractive drug target in the treatment of hormone-responsive breast cancer, and aromatase activity in breast cancer patients is greater in or near the tumor tissue compared with the normal breast tissue. Complex regulation of aromatase expression in human tissues involves alternative promoter sites that provide tissue-specific control. Previous studies in our laboratories suggested a strong association between aromatase (CYP19) gene expression and the expression of cyclooxygenase (COX) genes. Additionally, COX selective inhibitors can suppress CYP19 gene expression and decrease aromatase activity. Our current hypothesis is that pharmacological regulation of aromatase can act locally to decrease the …
Applications Of Block Copolymer Films In The Field Of Electrochemical Energy Systems, 2010 State Key Laboratory of Electronic Thin Film and Integrated Device,School of Microelectronic and Solid-state Electronic,University of Electronic Science and Technology of China,Chengdu 610054,China;
Applications Of Block Copolymer Films In The Field Of Electrochemical Energy Systems, Jing-Ze Li, Guo-Guang Chen, Di Mei, Wei Zou, Jian-Wen Li, Motonori Komura, Tomokazu Iyoda
Journal of Electrochemistry
A new series of amphiphilic liquid crystalline block copolymer thin films,having normally aligned and highly ordered nanocylinder array,were functionalized as anisotropic ion conducting materials by selectively infiltration.These ion-active nanocylinders are coaxially aligned and hexagonally arranged in a large area,which might be used as novel types of electrolyte films for electrochemical energy systems such as lithium ion battery,fuel cell,etc.Since the ordered cylinders can carry on and store the ions,the block copolymer films can be utilized as the advanced template to fabricate the ordered array of nanoporous,nanoparticles,and nanowires for the potential application in lithium ion battery as three dimensional electrode materials.
The Electrochemical Characteristics Of Cpo-Pll/Gc Electrode, 2010 Life and Environment Science College,Shanghai Normal University,Shanghai 200234,China;
The Electrochemical Characteristics Of Cpo-Pll/Gc Electrode, Wen Zhao, Xia-Qin Wu, Zhong-Qing Lu, Wen-Jing Hou, He-Xing Li
Journal of Electrochemistry
Poly-L-lysine(PLL) was electropolymerized onto the surface of glassy carbon(GC) electrode.1[(3-dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride(EDC) was used as a Cross-linking agent to immobilized Chloroperoxidase(CPO) onto the PLL/GC electrode.A pair of well-defined redox peaks was observed at CPO-PLL/GC electrode,which clearly suggested that PLL can promote the direct electron transfer between the CPO and the GC electrodes.The cyclic voltammetry results also showed that the electron transfer at CPO-PLL/GC is a surface adsorption-controlled quasi-reversible process,which is accompanied with proton transfer.The CPO-PLL/GC electrode exhibited a good electrochemical stability and excellently electrocatalytic activity for electrochemical reduction of O2.