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2229 full-text articles. Page 1 of 42.

Friedrich Wöhler, John Alfred Heitmann 2016 University of Dayton

Friedrich Wöhler, John Alfred Heitmann

John A. Heitmann

Friedrich Wöhler synthesized urea in 1828 and thus first demonstrated that organic materials, heretofore believed to possess a vital force, need not be made exclusively within living organisms. He also isolated aluminum metal in 1827 and discovered the elements beryllium and yttrium.


The Treatment Of Exchange In Path Integral Simulations Via An Approximate Pseudopotential, Randall W. Hall 2016 Department of Chemistry, Louisiana State University, Baton Rouge

The Treatment Of Exchange In Path Integral Simulations Via An Approximate Pseudopotential, Randall W. Hall

Randall W. Hall

An approximate form that includes the effects of exchange is suggested for the short time propagator used in path integral simulations. The form is inspired physically by the approximation made in Hartree–Fock treatments of atoms and molecules. The approximate propagator is used with q u a n t i t a t i v e accuracy in two systems: an ideal gas of fermions localized in a three‐dimensional harmonic well and the triplet state of the sodium dimer.


Rotational And Hyperfine Analysis Of Aus, Ian A. Wyse 2016 Macalester College

Rotational And Hyperfine Analysis Of Aus, Ian A. Wyse

Macalester Journal of Physics and Astronomy

Gas phase diatomic gold sulfide, AuS, was analyzed using optical spectroscopy. High-resolution spectra were collected and characterized and a global fit of the A2+-X23/2 (0,0), B2-X23/2 (0,0), and C2Δ3/2-X21/2 (0,0) transitions at 15570 cm-1, 16290 cm-1, and 17670 cm-1 was compiled and resulted in rotational constant determinations for the A2+((2σ)1(4π)4), B2((2σ)2(4π)2(2σ*)1), and C2Δ3/2((2σ)2(4π)2(2σ*)1) upper ...


Metal Assisted Chemical Etching, Inayat Bajwa 2016 Quattrone Nanofabrication Facility

Metal Assisted Chemical Etching, Inayat Bajwa

Protocols and Reports

No abstract provided.


Computational Studies Of Spin Trapping Of Biologically Relevant Radicals By New Heteroaryl Nitrones, Eyram Asempa 2016 East Tennessee State Universtiy

Computational Studies Of Spin Trapping Of Biologically Relevant Radicals By New Heteroaryl Nitrones, Eyram Asempa

Electronic Theses and Dissertations

Heteroaryl nitrone spin traps have been suggested to act as free radical scavengers. The geometry optimizations and the single-point energies of the spin trapping reactions of the heteroaryl nitrones, 5,5-dimethylpyrroline-N-oxide (DMPO) and α-phenyl-N-t-butylnitrone (PBN) have been computationally studied using ab initio (Hartree-Fock (HF) and second-order Møller-Plesset (MP2)) methods and Density Functional Theory (DFT) methods. The effects of new heteroaryl substituents on a parent nitrone spin trap have been examined at the HF and MP2 levels with the 6-31G*, and cc-pVnZ (n=D, T, Q) basis sets. The thermodynamics of the spin trapping at the C-site and O-site ...


Studies Of The Development Of Intermolecular Networks During The Curing Of Coatings Using Single-Sided Nuclear Magnetic Resonance, Frances Jude Morin 2016 College of William and Mary

Studies Of The Development Of Intermolecular Networks During The Curing Of Coatings Using Single-Sided Nuclear Magnetic Resonance, Frances Jude Morin

College of William & Mary Undergraduate Honors Theses

In recent years, the development and accessibility of UV-cured coatings have made them a focus of polymer studies. UV-cured coatings provide a variety of benefits over traditional air-drying coatings. UV-coatings have been studied fairly extensively but many of the techniques used to track curing are destructive. Single-sided nuclear magnetic resonance (NMR) provides an alternative, non-invasive and non-destructive technique for these curing studies. The cross-linking in the coating poly(ethylene glycol) diacrylate (PEGDA) was monitored through two measurements, T2 relaxation and Multiple-Quantum Coherences. These two NMR experiments will provide a picture of the level of molecular network formation during the ...


Binding Of Oxygen To Human Hemoglobin Within The Erythrocyte Using Icam Spectrophotometry, Kyle K. Hill 2016 University of Nebraska-Lincoln

Binding Of Oxygen To Human Hemoglobin Within The Erythrocyte Using Icam Spectrophotometry, Kyle K. Hill

Student Research Projects, Dissertations, and Theses - Chemistry Department

Many of the spectrophotometric techniques used to determine the properties of intracellular human hemoglobin cannot be utilized due to the turbidity of erythrocyte suspensions. An Integrating Cavity Absorption Meter, or ICAM, allows for absorption measurements of strongly scattering samples in the visible-light region of the spectrum. The spectrum of oxygenated hemoglobin within erythrocytes is significantly different from the absorption spectrum of oxygenated hemoglobin in solution. Studies of the oxygen binding to hemoglobin in erythrocytes allowed the four sequential binding constants (Adair constants) to be determined and compared with those of hemoglobin in solution. The Adair constants for hemoglobin in solution ...


Is The Maxwell Construction Correct In Predicting The Van Der Waals Fluid's Vapor Pressure?, Carl W. David 2016 University of Connecticut

Is The Maxwell Construction Correct In Predicting The Van Der Waals Fluid's Vapor Pressure?, Carl W. David

Chemistry Education Materials

The Maxwell construction yields a pressure value which traditionally been associated with the vapor pressure. Here, the question is answered whether or not the two phases represented by the construct are indeed in equilibrium.


Photocatalytic Properties Of G-C3n4–Tio2 Heterojunctions Under Uv And Visible Light Conditions, Rachel Fagan, Declan E. McCormack, Steven J. Hinder, Suresh Pillai 2016 Dublin Institute of Technology

Photocatalytic Properties Of G-C3n4–Tio2 Heterojunctions Under Uv And Visible Light Conditions, Rachel Fagan, Declan E. Mccormack, Steven J. Hinder, Suresh Pillai

Articles

Graphitic carbon nitride (g-C3N4) and titanium dioxide (TiO2) were chosen as a model system to investigate photocatalytic abilities of heterojunction system under UV and visible light conditions. The use of g-C3N4 has been shown to be effective in the reduction in recombination through the interaction between the two interfaces of TiO2 andg-C3N4. A simple method of preparing g-C3N4 through the pyrolysis of melamine was employed, which was then added to undoped TiO2 material to form the g-C3N4–TiO2 system. These materials were then fully characterized by X-ray diffraction (XRD), Brunauer Emmett Teller (BET), and various spectroscopic techniques including Raman, X-ray ...


Characterization Of A Zinc Finger Protein With A High Affinity For The Rev Binding Site Of The Human Immunodeficiency Virus, Beatrice Arthur Edjah 2016 Georgia State University

Characterization Of A Zinc Finger Protein With A High Affinity For The Rev Binding Site Of The Human Immunodeficiency Virus, Beatrice Arthur Edjah

Georgia State Undergraduate Research Conference

No abstract provided.


13c Nmr Spectroscopy: Transmission Effects In 1-Phenyl-3,5-Diarylpyrazoles, Amy N. Hockstedler, Anand B. Shah, Beatrice A. Edjah, Glenda M. Duffek, Krishna D. Patel, Hadrian Mendoza, Hayley B. Arrowood, Nicole A. Brown, Saajid Z. Azhar 2016 Georgia State University

13c Nmr Spectroscopy: Transmission Effects In 1-Phenyl-3,5-Diarylpyrazoles, Amy N. Hockstedler, Anand B. Shah, Beatrice A. Edjah, Glenda M. Duffek, Krishna D. Patel, Hadrian Mendoza, Hayley B. Arrowood, Nicole A. Brown, Saajid Z. Azhar

Georgia State Undergraduate Research Conference

No abstract provided.


Novel Mitochondrial Complex I Inhibitors Restore Glucose-Handling Abilities Of High-Fat Fed Mice, Gemma Kinsella, Darren Martin, Siobhan Leonard, Robert Devine, Clara Redondo, Conor Breen, Victoria McEneaney, Mary Rooney, Tim Munsey, Richard Porter, Asipu Sivaprasadarao, John Stephens, John Findlay 2016 Dublin Institute of Technology

Novel Mitochondrial Complex I Inhibitors Restore Glucose-Handling Abilities Of High-Fat Fed Mice, Gemma Kinsella, Darren Martin, Siobhan Leonard, Robert Devine, Clara Redondo, Conor Breen, Victoria Mceneaney, Mary Rooney, Tim Munsey, Richard Porter, Asipu Sivaprasadarao, John Stephens, John Findlay

Articles

Metformin is the main drug of choice for treating type 2 diabetes, yet the therapeutic regimens and side effects of the compound are all undesirable and can lead to reduced compliance. The aim of this study was to elucidate the mechanism of action of two novel compounds which improved glucose handling and weight gain in mice on a high-fat diet. Wildtype C57Bl/6 male mice were fed on a high-fat diet and treated with novel, anti-diabetic compounds. Both compounds restored the glucose handling ability of these mice. At a cellular level, these compounds achieve this by inhibiting complex I activity ...


Hydrogen-Bonding Control Of Solvatochromism And Non-Radiative Decay In The Fluorescence Of 3-Aminofluoren-9-One Derivatives, Isaac Gregory Alty 2016 College of William and Mary

Hydrogen-Bonding Control Of Solvatochromism And Non-Radiative Decay In The Fluorescence Of 3-Aminofluoren-9-One Derivatives, Isaac Gregory Alty

College of William & Mary Undergraduate Honors Theses

The object of this study is to determine whether in-plane or out-of-plane hydrogen bonds to solvent molecules more efficiently quench fluorescence in 3-aminofluoren-9-one systems. 3-Aminofluoren-9-one has a high quantum yield of fluorescence, and it exhibits strong fluorescence quenching in protic solvents. To determine the mode of hydrogen-bonding that leads to the greatest quenching, 3-aminofluoren-9-one and two derivatives, 3-amino-6,8-dimethylfluoren-9-one and 3-amino-1,8-dimethylfluoren-9-one were synthesized. The fluorescence of these molecules in various binary solvent mixtures was studied to determine the strength of quenching and shifts in fluorescence maxima in solvents of different polarity. Determination of the mode of solvent hydrogen-bonding that ...


Xiao Cheng Zeng Bibliography (April 2016), Xiao Cheng Zeng 2016 University of Nebraska - Lincoln

Xiao Cheng Zeng Bibliography (April 2016), Xiao Cheng Zeng

Xiao Cheng Zeng Publications

397 articles sorted by topics


A Sodium Salt Of The Dimer Of Boronoterephthalic Acid Anhydride, Scott Simmons, Albert Fratini, Vladimir Benin 2016 University of Dayton

A Sodium Salt Of The Dimer Of Boronoterephthalic Acid Anhydride, Scott Simmons, Albert Fratini, Vladimir Benin

Albert Fratini

The title compound, sodium bis­(6-carb­oxy-1-hy­droxy-3-oxo-1,3-dihydro-2,1-benzoxaborol-1-yl)oxidanium, Na+·C16H15B2O13-, was prepared in two steps from 2-bromo-p-xylene. Its crystal structure was determined at 140 K and has triclinic (P) symmetry. The compound presents a unique structural motif, including two units of the cyclic anhydride of boronoterephthalic acid, joined by a protonated, and thereby trivalent, oxonium center. Association in the crystal is realized by complementary hydrogen bonding of the carboxyl groups, as well as by coordination of the sodium cations to the oxygen centers on the five-membered rings.


An Effective Method For The Preparation Of High Temperature Stable Anatase Tio2 Photocatalysts, Rachel Fagan, Declan McCormack, Suresh Pillai, Damian Synnott 2016 Dublin Institute of Technology

An Effective Method For The Preparation Of High Temperature Stable Anatase Tio2 Photocatalysts, Rachel Fagan, Declan Mccormack, Suresh Pillai, Damian Synnott

Articles

An efficient, rapid and straightforward method for the preparation of nitrogen and fluorine (N, F) codoped high temperature stable anatase using a microwave pre-treatment is reported. Using a single source, ammonium fluoride (NH4F) for both nitrogen and fluorine, effective doping of the precursor titanium isopropoxide (TTIP) was possible. These samples were characterised for their structural and optical properties using X-ray diffraction (XRD), Fourier transform IR (FTIR), Raman spectroscopy and UV-vis spectroscopy. In terms of the anatase to rutile transition enhancement using a novel microwave assisted technique, the sample prepared in a composition of 1:8 TiO2: NH ...


Koh Etching Of (100) Si Wafer, No 1, Inayat Bajwa 2016 Quattrone Nanofabrication Facility

Koh Etching Of (100) Si Wafer, No 1, Inayat Bajwa

Protocols and Reports

No abstract provided.


Efficient Bimolecular Mechanism Of Photochemical Hydrogen Production Using Halogenated Boron-Dipyrromethene (Bodipy) Dyes And A Bis(Dimethylglyoxime) Cobalt(Iii) Complex, Randy Sabatini, Brian Lindley, Theresa McCormick, Theodore Lazarides, William Brennessel, David McCamant, Richard Eisenberg 2016 University of Rochester

Efficient Bimolecular Mechanism Of Photochemical Hydrogen Production Using Halogenated Boron-Dipyrromethene (Bodipy) Dyes And A Bis(Dimethylglyoxime) Cobalt(Iii) Complex, Randy Sabatini, Brian Lindley, Theresa Mccormick, Theodore Lazarides, William Brennessel, David Mccamant, Richard Eisenberg

Theresa M. McCormick

A series of Boron-­dipyrromethene (Bodipy) dyes were used as photosensitizers for photochemical hydrogen production in conjunction with [CoIII(dmgH)2pyCl] (where dmgH = dimethylglyoximate, py = pyridine) as the catalyst and triethanolamine (TEOA) as the sacrificial electron donor. The Bodipy dyes are fully characterized by electrochemistry, x-­‐ray crystallography, quantum chemistry calculations, femtosecond transient absorption and time-­‐resolved fluorescence, as well as in long-­‐term hydrogen production assays. Consistent with other recent reports, only systems containing halogenated chromophores were active for hydrogen production, as the long-­‐lived triplet state is necessary for efficient bimolecular electron transfer. Here, it is shown that ...


Procesy Cieplne I Aparaty (Lab), Wojciech Budzianowski 2016 Wroclaw University of Technology

Procesy Cieplne I Aparaty (Lab), Wojciech Budzianowski

Wojciech Budzianowski

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Improved High Temperature Stability Of Anatase Tio2 Photocatalysts By N, F, P Co-Doping, Rachel Fagan, Declan McCormack, Steven Hinder, Suresh Pillai 2016 Dublin Institute of Technology

Improved High Temperature Stability Of Anatase Tio2 Photocatalysts By N, F, P Co-Doping, Rachel Fagan, Declan Mccormack, Steven Hinder, Suresh Pillai

Articles

Among the three commonly occurring phases (anatase, rutile, and brookite) of TiO2, the anatase form is reported to be the best photocatalyst due to the improved charge-carrier mobility and the greater number of surface hydroxyl groups. The anatase to rutile transition in titania photocatalysts usually occurs at a temperature between 500 °C to 700 °C. Development of a high temperature stable (above 1000 °C) anatase phase is important for various environmental applications (e.g. self-cleaning ceramic tiles, anti-microbial sanitary wares, etc.). In this study, the use of ammonium hexafluorophosphate as a single source dopant (method A) and urea, trifluoroacetic acid ...


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