Probing The Structure And Photophysics Of Porphyrinoid Systems For Functional Materials, 2016 The Graduate Center, City University of New York
Probing The Structure And Photophysics Of Porphyrinoid Systems For Functional Materials, Christopher D. Farley
All Graduate Works by Year: Dissertations, Theses, and Capstone Projects
Porphyrins (Pors) and their many cousins, including phthalocyanines (Pcs), corroles (Cors), subphthalocyanines (SubPcs), porphyrazines (Pzs), and naphthalocyanines (NPcs), play amazingly diverse roles in biological and non-biological systems because of their unique and tunable physical and chemical properties. These compounds, collectively known as porphyrinoids, can be employed in any number of functional devices that have the potential to address the challenges of modern society. Their incorporation into such devices, however, depends on many structural factors that must be well understood and carefully controlled in order to achieve the desired behavior. Self-assembly and self-organization are key processes for developing these new technologies ...
Gc Verification Of The Spacecraft Atmosphere Monitor, 2016 California Polytechnic State University, San Luis Obispo
Gc Verification Of The Spacecraft Atmosphere Monitor, Jessica S. Castro, Richard D. Kidd, Jeffrey D. Hein
STAR (STEM Teacher and Researcher) Presentations
International Space Station crew members face the unique challenge of maintaining air quality due to the volatile organic compounds (VOCs) that have the potential to accumulate at unsafe levels. The Spacecraft Atmosphere Monitor (SAM) is a miniature gas chromatograph/mass spectrometer (GCMS) designed to measure major constituents (such as N2, O2 and CO2) and trace VOCs within the cabin of the spacecraft. The gas chromatograph is responsible for separating the sample into its components in order to be characterized. The oven of the gas chromatograph must reach a temperature of 150°C in order to heat constituents ...
Directed Self-Assembly Of Block Copolymer, No1, 2016 Singh Center
Directed Self-Assembly Of Block Copolymer, No1, Hiromichi Yamamoto
Protocols and Reports
The PS-rich and neutral PS-b-PMMA block copolymer (BCP) films were spin coated on the neutral random copolymer hydroxyl-terminated PS-r-PMMA layers grafted on the native oxide and 50 nm thick PECVD amorphous silicon oxide layers. Relationship between the grafting density of BCP and surface density of hydroxyl moiety on silicon oxide is discussed. Furthermore, optimization of annealing BCP films is reported, and wetted and de-wetted BCP films are shown in optical microscope images. In addition, finger print and nanopore structures of BCP films are also indicated in SEM images.
Qualitative Detection Of Selected Designer Drugs And Relevant Metabolites In Environmental Water Samples, 2016 Florida International University
Qualitative Detection Of Selected Designer Drugs And Relevant Metabolites In Environmental Water Samples, Marley Pruyn
FIU Electronic Theses and Dissertations
Designer drugs are compounds which have been synthetically derived from illicit drugs. After consumption, drugs and their metabolites are introduced into the sewage water which is treated and disposed into the environment. A combined target, suspect and non-target workflow was created to detect designer drugs in environmental water samples. Multiple water samples were spiked with an unknown mixture of drugs and metabolites to assess the efficiency of the method. Samples were collected from sewage influent and effluent pipes, downstream from a sewage outfall and reclaimed water. Analysis was conducted with high resolution MS using the QExactive Orbitrap. Screening was performed ...
Biological Information And Its Origins: The Curious Case Of Rna, 2016 Seattle Pacific University
Biological Information And Its Origins: The Curious Case Of Rna, Grace E. Andrews
Information is an important pre-requisite for the onset of life, which means that any study of the origins of life must also address the origin of information. Biological information today is generally conceptualized in terms of the Central Dogma of Biology, with DNA as a digitized code within the cell. However, here I propose that biological information - particularly in prebiotic conditions, where information would have first arisen - is better understood in terms of the three-dimensional structure of a molecule. Evidence for information storage in RNA can be seen in a number of ways. One of these is that, instead of ...
Interaction Of Spliceosomal U2 Snrnp Protein P14 With Its Branch Site Rna Target, 2016 Graduate Center, City University of New York
Interaction Of Spliceosomal U2 Snrnp Protein P14 With Its Branch Site Rna Target, William Perea Vargas
All Graduate Works by Year: Dissertations, Theses, and Capstone Projects
Newly transcribed precursor messenger RNA (pre-mRNA) molecules contain coding sequences (exons) interspersed with non-coding intervening sequences (introns). These introns must be removed in order to generate a continuous coding sequence prior to translation of the message into protein. The mechanism through which these introns are removed is known as pre-mRNA splicing, a two-step reaction catalyzed be a large macromolecular machine, the spliceosome, located in the nucleus of eukaryotic cells. The spliceosome is a protein-directed ribozyme composed of small nuclear RNAs (snRNA) and hundreds of proteins that assemble in a very dynamic process. One of these snRNAs, the U2 snRNA, is ...
Facilitating Conceptual Learning In Quantitative Chemistry, 2016 East Tennessee State University
Facilitating Conceptual Learning In Quantitative Chemistry, Sarah R. Johnson
Electronic Theses and Dissertations
Traditional chemistry laboratory courses have a manual consisting of “step-by-step” experiments; instructions are given to complete experiments, requiring minimal information/concepts processing to be successful. This experience leaves students unprepared for the real-world, where critical thinking skills are needed to conduct research. This study focused on building analytical techniques, conceptual knowledge, and critical thinking skills used to solve research problems. A new quantitative chemistry laboratory manual was developed to transition students from traditional to inquiry-based experiments, requiring analytical method development. Data showed students having less difficulty using the new manual (0.8281 average difficulty) on method development exam questions and ...
Direct Band Gap Gallium Antimonide Phosphide (Gasbxp1-X) For Solar Fuels., 2016 University of Louisville
Direct Band Gap Gallium Antimonide Phosphide (Gasbxp1-X) For Solar Fuels., Harry Benjamin Russell
Electronic Theses and Dissertations
Photoelectrochemical water splitting has been identified as a promising route for achieving sustainable energy future. However, semiconductor materials with the appropriate optical, electrical and electrochemical properties have yet to be discovered. In search of an appropriate semiconductor to fill this gap, GaSbP, a semiconductor never tested for PEC performance is proposed here and investigated. Density functional theory (DFT+U) techniques were utilized to predict band gap and band edge energetics for GaSbP alloys with low amount of antimony. The overall objective of this dissertation is to understand the suitability of GaSbxP1-x alloys for photoelectrochemical water splitting application ...
Staphylococcal Nuclease And Ubiquitin Local Folding Energies And Rates Using Peps-Hdx-Esi-Ms, 2016 University of Arkansas, Fayetteville
Staphylococcal Nuclease And Ubiquitin Local Folding Energies And Rates Using Peps-Hdx-Esi-Ms, Julie Rhee
Chemistry & Biochemistry Undergraduate Honors Theses
In this study, Protein Equilibrium Population Snapshot Hydrogen-Deuterium Exchange Electrospray Ionization Mass Spectrometry (PEPS-HDX-ESI-MS) was applied to study the local regions of model proteins, staphylococcal nuclease and ubiquitin. The hydrogen deuterium exchange (HDX) has become a key technique for studying the structural and dynamic aspects of proteins in solution. This technique creates a rapid exchange between all of the exchangeable hydrogen ions with deuterium when the protein is exposed to a solvent. The PEPS method is an equilibrium-based method used to determine the populations of the closed native and open denatured states of a protein. By combining the applications of ...
Titanium-Oxides As A Stabilizing Agent For Environmentally Persistent Free Radicals (Epfrs), 2016 Dominican University of California
Titanium-Oxides As A Stabilizing Agent For Environmentally Persistent Free Radicals (Epfrs), Josef Baylis
Scholarly and Creative Works Conference
The mechanism of formation for surface bound radicals were studied using ab initio quantum methods. The shift in electron density from transition metal surfaces to surface bound radical groups was studied to learn the mechanism for the binding. Results indicate an oxidation-reduction based mechanism of formation.
Characterization Of A Zinc Finger Protein With A High Affinity For The Rev Binding Site Of The Human Immunodeficiency Virus, 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.
A Sodium Salt Of The Dimer Of Boronoterephthalic Acid Anhydride, 2016 University of Dayton
A Sodium Salt Of The Dimer Of Boronoterephthalic Acid Anhydride, Scott Simmons, Albert Fratini, Vladimir Benin
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.
Theoretical Investigation Of Interaction Between The Set Of Ligands And Α7 Nicotinic Acetylcholine Receptor, 2016 Saratov State University
Theoretical Investigation Of Interaction Between The Set Of Ligands And Α7 Nicotinic Acetylcholine Receptor, O. E. Glukhova, Tatiana Prytkova, D. S. Shmygin
Biology, Chemistry, and Environmental Sciences Faculty Articles and Research
Nicotinic acetylcholine receptors (nAChRs) are neuron receptor proteins that provide a transmission of nerve impulse through the synapses. They are composed of a pentametric assembly of five homologous subunits (5 α7 subunits for α7nAChR, for example), oriented around the central pore. These receptors might be found in the chemical synapses of central and peripheral nervous system, and also in the neuromuscular synapses. Transmembrane domain of the one of such receptors constitutes ion channel. The conductive properties of ion channel strongly depend on the receptor conformation changes in the response of binding with some molecule, f.e. acetylcholine. Investigation of interaction ...
Derivation And Implementation Of The Gradient Of The R–7 Dispersion Interaction In The Effective Fragment Potential Method, Emilie B. Guidez, Peng Xu, Mark S. Gordon
The dispersion interaction energy may be expressed as a sum over R–n terms, with n ≥ 6. Most implementations of the dispersion interaction in model potentials are terminated at n = 6. Those implementations that do include higher order contributions commonly only include even power terms, despite the fact that odd power terms can be important. Because the effective fragment potential (EFP) method contains no empirically fitted parameters, the EFP method provides a useful vehicle for examining the importance of the leading R–7 odd power term in the dispersion expansion. To fully evaluate the importance of the R–7 contribution ...
Vladimir Prelog And His Contribution To Stereochemistry, 2016 Parkland College
Vladimir Prelog And His Contribution To Stereochemistry, Kevin Jiang
Natural Sciences Poster Sessions
This poster for the Natural Sciences Poster Session at Parkland College features chemist Vladimir Prelog, best known for his contributions to the Canin-Ingold-Prelog Rules.
Conversion Of Levulinic Acid To Γ-Valerolactone Over Few-Layer Graphene-Supported Ruthenium Catalysts, 2016 Iowa State University
Conversion Of Levulinic Acid To Γ-Valerolactone Over Few-Layer Graphene-Supported Ruthenium Catalysts, Chaoxian Xiao, Tian Wei Goh, Zhiyuan Qi, Shannon Goes, Kyle Brashler, Christopher Perez, Wenyu Huang
Few-layer graphene (FLG) supported ruthenium nanoparticle catalysts were synthesized and used for the hydrogenation of levulinic acid (LA), one of the “top 10” biomass platform molecules derived from carbohydrates. FLG-supported ruthenium catalyst showed 99.7% conversion and 100% selectivity toward γ-valerolactone (GVL) at room temperature in a batch reactor under high-pressure hydrogen. This catalyst showed 4 times higher activity and exceptional stability in comparison with traditional activated carbon supported ruthenium catalysts (Ru/C). X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared spectroscopy (FTIR) studies suggest that the superior catalytic properties of Ru nanoparticles supported on FLG in LA hydrogenation could ...
Dnp-Enhanced Ultrawideline Solid-State Nmr Spectroscopy: Studies Of Platinum In Metal–Organic Frameworks, 2016 Iowa State University
Dnp-Enhanced Ultrawideline Solid-State Nmr Spectroscopy: Studies Of Platinum In Metal–Organic Frameworks, Takeshi Kobayashi, Frédéric A. Perras, Tian Wei Goh, Tanner L. Metz, Wenyu Huang, Marek Pruski
Ultrawideline dynamic nuclear polarization (DNP)-enhanced 195Pt solid-state NMR (SSNMR) spectroscopy and theoretical calculations are used to determine the coordination of atomic Pt species supported within the pores of metal–organic frameworks (MOFs). The 195Pt SSNMR spectra, with breadths reaching 10 000 ppm, were obtained by combining DNP with broadbanded cross-polarization and CPMG acquisition. Although the DNP enhancements in static samples are lower than those typically observed under magic-angle spinning conditions, the presented measurements would be very challenging using the conventional SSNMR methods. The DNP-enhanced ultrawideline NMR spectra served to separate signals from cis- and trans-coordinated atomic Pt ...
The Development Of Colorimetric Assays To Determine The Identity And Frequency Of Specific Nucleobases In Dna Oligomers, Elizabeth Marie Thomas
Theses and Dissertations--Chemistry
Colorimetric methods combined with color-changing chemical probes are widely used as simple yet effective tools for identifying and quantifying a wide variety of molecules in solution. For nucleic acids (DNA and RNA), perhaps the most commonly used colorimetric probe is potassium permanganate, which can be used to identify single-stranded pyrimidines (thymine and cytosine) in polymers. Unfortunately, permanganate is not an effective probe for identifying purines (adenine and guanine), especially in the presence of the more reactive pyrimidines. Therefore, robust methods for discriminating between the purines remain elusive, thereby creating a barrier toward developing more complex colorimetric applications. In this dissertation ...
Ring Closures And The Hammond Postulate, 2016 University of Nebraska-Lincoln
Ring Closures And The Hammond Postulate, Charles A. Kingsbury
Faculty Publications -- Chemistry Department
This work reports an investigation of ring closure processes in relation to the Hammond postulate. Calculations favor the importance of thermodynamics, not kinetics, as the basis for the Hammond postulate. A kinetically rapid, but thermodynamically unfavorable reaction is shown to resemble product. The ease of ring closure to three-membered rings, compared to four-membered rings, is thought to be associated with conformational mobility and perhaps vibrations coupled to the reaction coordinate motion in the case of four-membered rings.
Engineering Escherichia Coli For High‑Yield Geraniol Production With Biotransformation Of Geranyl Acetate To Geraniol Under Fed‑Batch Culture, Wei Liu, Xin Xu, Rubing Zhang, Tao Cheng, Yujin Cao, Xiaoxiao Li, Jiantao Guo, Huizhou Liu, Mo Xian
Faculty Publications -- Chemistry Department
Background: Geraniol is an acyclic monoterpene alcohol, which exhibits good prospect as a gasoline alternative. Geraniol is naturally encountered in plants at low concentrations and an attractive target for microbial engineering. Geraniol has been heterologously produced in Escherichia coli, but the low titer hinders its industrial applications. Moreover, bioconversion of geraniol by E. coli remains largely unknown.
Results: Recombinant overexpression of Ocimum basilicum geraniol synthase, Abies grandis geranyl diphosphate synthase, and a heterotic mevalonate pathway in E. coli BL21 (DE3) enabled the production of up to 68.6 ± 3 mg/L geraniol in shake flasks. Initial fed-batch fermentation only increased ...