Electrochemical And Corrosion Examination Of Copper Under Deep Geologic Conditions For The Application Of Nuclear Waste Containers, 2018 The University of Western Ontario
Electrochemical And Corrosion Examination Of Copper Under Deep Geologic Conditions For The Application Of Nuclear Waste Containers, Taylor L. Martino
Electronic Thesis and Dissertation Repository
Copper is the selected material for the fabrication of nuclear fuel waste containers in Sweden, Finland and Canada due to its corrosion resistance in the anoxic aqueous environments, anticipated in deep geological repositories. A potential oxidant for copper is bisulphide produced either by the dissolution of minerals or by sulphate-reducing bacteria. The primary goals of this thesis were to determine the mechanism of corrosion of copper in bisulphide environments and to investigate the chemistry of the bentonite porewater that will ultimately be in contact with the copper container.
The mechanism of sulphide film growth and the details of copper corrosion ...
A High Throughput Approach For The Generation Of Orthogonally Interacting Protein Pairs, 2018 University of Nebraska-Lincoln
A High Throughput Approach For The Generation Of Orthogonally Interacting Protein Pairs, Justin Lawrie, Xi Song, Wei Niu, Jiantao Guo
Faculty Publications -- Chemistry Department
In contrast to the nearly error-free self-assembly of protein architectures in nature, artificial assembly of protein complexes with pre-defined structure and function in vitro is still challenging. To mimic nature’s strategy to construct pre-defined three-dimensional protein architectures, highly specific proteinprotein interacting pairs are needed. Here we report an effort to create an orthogonally interacting protein pair from its parental pair using a bacteria-based in vivo directed evolution strategy. This high throughput approach features a combination of a negative and a positive selection. The newly developed negative selection from this work was used to remove any protein mutants that retain ...
Analysis Of Veterinary Drug Residues In Imported And Domestic Crawfish Using Liquid Chromatography—Mass Spectrometry, 2018 Louisiana State University and Agricultural and Mechanical College
Analysis Of Veterinary Drug Residues In Imported And Domestic Crawfish Using Liquid Chromatography—Mass Spectrometry, Emily Kate Wall
LSU Master's Theses
Aquaculture production has greatly increased over the past few decades, and will continue to grow as the world fisheries become overfished and demand for seafood increases. With increased production comes more intense cultivation methods and heavy use of formulated feeds that may contain veterinary drug residues. Currently no antibiotics are allowed in the U.S. for crawfish aquaculture; yet, detectable levels of various antibiotics have been found in imported seafood samples.The FDA is responsible for testing aquaculture products entering the United States, but only has the capabilities to test a minimal amount of those imports. Additionally, for crawfish there ...
Abnormal Phase Transition Between Two-Dimensional High-Density Liquid Crystal And Low-Density Crystalline Solid Phases, 2018 University of Chinese Academy of Sciences
Abnormal Phase Transition Between Two-Dimensional High-Density Liquid Crystal And Low-Density Crystalline Solid Phases, Wenbin Li, Longjuan Kong, Baojie Feng, Huixia Fu, Hui Li, Xiao Cheng Zeng, Kehui Wu, Lan Chen
Xiao Cheng Zeng Publications
Some two-dimensional liquid systems are theoretically predicted to have an anomalous phase transition due to unique intermolecular interactions, for example the first-order transition between two-dimensional high-density water and low-density amorphous ice. However, it has never been experimentally observed, to the best of our knowledge. Here we report an entropy-driven phase transition between a high-density liquid crystal and low-density crystalline solid, directly observed by scanning tunneling microscope in carbon monoxide adsorbed on Cu(111). Combined with first principle calculations, we find that repulsive dipole–dipole interactions between carbon monoxide molecules lead to unconventional thermodynamics. This finding of unconventional thermodynamics in two-dimensional ...
On The Hyperbolicity Of The Two-Fluid Model For Gas–Liquid Bubbly Flows, 2018 Iowa State University
On The Hyperbolicity Of The Two-Fluid Model For Gas–Liquid Bubbly Flows, Nithin Panicker, Alberto Passalacqua, Rodney O. Fox
Chemical and Biological Engineering Publications
The hyperbolicity condition of the system of partial differential equations (PDEs) of the incompressible two-fluid model, applied to gas–liquid flows, is investigated. It is shown that the addition of a dispersion term, which depends on the drag coefficient and the gradient of the gas volume fraction, ensures the hyperbolicity of the PDEs, and prevents the nonphysical onset of instabilities in the predicted multiphase flows upon grid refinement. A constraint to be satisfied by the coefficient of the dispersion term to ensure hyperbolicity is obtained. The effect of the dispersion term on the numerical solution and on its grid convergence ...
Crystallographic,Vibrational Modes And Optical Properties Data Of Α-Dipabcrystal, 2018 Jordan University of Science and Technology
Crystallographic,Vibrational Modes And Optical Properties Data Of Α-Dipabcrystal, Ahmad Alsaad, Chris M. Marin, Nabil Alaqtash, Hsien-Wen Chao, Tsun-Hsu Chang, Chin Li Cheung, A. Ahmad, I. A. Qattan, Renat F. Sabirianov
Faculty Publications -- Chemistry Department
The Crystallographic data of the α-DIPABsamplewasmeasured using powder X-ray diffraction (PXRD). The crystal structure was also optimized using density functional based method. The calculations were performed both including vander Waals (vdW) interactions and excluding them to quantify the effects of vdW interaction on the crystal formation. The vibrational modesof DIPAB crystal corresponding to the Bromine deficient samples are calculated and presented. These show the origin of drastic change in dielectric response in Br deficient samples as compared to the ideal stoichiometric DIPAB crystal (Alsaad et al. 2018) . Optical properties of an ideal α-DIPAB were calculated using GGA and HSE06 ...
Relationships Among Vitamin D Deficiency, Metabolic Syndrome, Smoking Behavior, And Physical Activity, Ethan Pham
Walden Dissertations and Doctoral Studies
Aging increases the risk of both vitamin D deficiency and metabolic syndrome. Vitamin D deficiency and metabolic syndrome may be related, although there are mixed findings. Furthermore, literature suggests other factors such as physical fitness activity and smoking behavior are associated with Vitamin D deficiency and the development of metabolic syndrome. A number of studies have documented associations between Vitamin D levels and physical fitness activities, while other studies found correlations between Vitamin D levels, metabolic syndrome, and smoking behavior. However, no previous study has examined the links between physical fitness activity, smoking behavior, Vitamin D levels, and the risks ...
Towards A Greater Understanding Of Post-Translational Modification Of Transcription Factor, Arsr, In Helicobacter Pylori Via Bottom-Up Proteomics: Methods Development For Electrospray And Nanospray Approaches, 2017 College of William and Mary
Towards A Greater Understanding Of Post-Translational Modification Of Transcription Factor, Arsr, In Helicobacter Pylori Via Bottom-Up Proteomics: Methods Development For Electrospray And Nanospray Approaches, Theresa Gozzo
Undergraduate Honors Theses
Studies presented here work towards the analysis of post-translational modification of the essential ArsR transcription factor of Helicobacter pylori. A human health hazard, H. pylori contributes to the development of gastric cancer and peptic ulcers in its hosts. It is of interest to study the mechanisms that allow the bacterium to survive long term in the harsh stomach environment. The ArsRS signaling pathway mediates the repression of sabA, the gene coding for the adhesin protein, SabA, in acidic conditions. The repression is dependent on histidine kinase, ArsS, but independent of phosphorylation of ArsR at the canonical aspartic acid 52 (D52 ...
Development Of Pre-Clinical Assays Based On Tandem Mass Spectrometry To Investigate Gabaa Receptor Modulators, 2017 University of Wisconsin-Milwaukee
Development Of Pre-Clinical Assays Based On Tandem Mass Spectrometry To Investigate Gabaa Receptor Modulators, Margaret Laurel Guthrie
Theses and Dissertations
DEVELOPMENT OF PRE-CLINICAL ASSAYS BASED ON TANDEM MASS SPECTROMETRY TO INVESTIGATE GABAA RECEPTOR MODULATORS
Margaret L. Guthrie
The University of Wisconsin – Milwaukee, 2017
Under the Supervision of Professor Alexander (Leggy) Arnold
Drugs are compounds that interact with a biological system to produce a specific biological response. The goal of drug discovery is to design and synthesize a pharmaceutical agent that will produce a desired biological effect. However, the in-vivo effects of a drug molecule cannot be predicted without a variety of test results prior to human clinical trials. In order to designate any drug compound as a leading ...
Bioinformatic And Biophysical Analyses Of Proteins, 2017 University of Nebraska-Lincoln
Bioinformatic And Biophysical Analyses Of Proteins, Jonathan Catazaro
Student Research Projects, Dissertations, and Theses - Chemistry Department
The prevailing dogma in structural genomics is the existence of a strong correlation between protein sequence, structure, and biological function. Proteins with high sequence similarity typically have a similar, if not the same, structure and function. In many cases this logic can fail due to distantly related proteins having very low sequence similarity, a lack of a representative structure, structural novelty, or the absence of a characterized function. Further, the paradigm fails to account for dynamics, which have a significant effect on structural stability and enzymatic efficacy.
Nuclear magnetic resonance (NMR) spectroscopy is uniquely capable of solving the structure, assisting ...
Unmanned Aerial Systems For Monitoring Trace Tropospheric Gases, 2017 University of Kentucky
Unmanned Aerial Systems For Monitoring Trace Tropospheric Gases, Travis J. Schuyler, Marcelo I. Guzman
Chemistry Faculty Publications
The emission of greenhouse gases (GHGs) has changed the composition of the atmosphere during the Anthropocene. Accurately documenting the sources and magnitude of GHGs emission is an important undertaking for discriminating the contributions of different processes to radiative forcing. Currently there is no mobile platform that is able to quantify trace gases at altitudes(UASs) can be deployed on-site in minutes and can support the payloads necessary to quantify trace gases. Therefore, current efforts combine the use of UASs available on the civilian market with inexpensively designed analytical systems for monitoring atmospheric trace gases. In this context, this perspective introduces ...
Distinct Ice Patterns On Solid Surfaces With Various Wettabilities, 2017 Chinese Academy of Sciences
Distinct Ice Patterns On Solid Surfaces With Various Wettabilities, Jie Liu, Chongqin Zhu, Kai Liu, Ying Jiang, Yanlin Song, Joseph S. Francisco, Xiao Cheng Zeng, Jianjun Wang
Xiao Cheng Zeng Publications
No relationship has been established between surface wettability and ice growth patterns, although ice often forms on top of solid surfaces. Here, we report experimental observations obtained using a process specially designed to avoid the influence of nucleation and describe the wettability-dependent ice morphology on solid surfaces under atmospheric conditions and the discovery of two growth modes of ice crystals: along-surface and off-surface growth modes. Using atomistic molecular dynamics simulation analysis, we show that these distinct ice growth phenomena are attributable to the presence (or absence) of bilayer ice on solid surfaces with different wettability; that is, the formation of ...
Fabrication And Characterization Of Cuins₂ And Cuinse₂ Light-Absorbing Thin Films For Use In Solar Cells, 2017 The University of Western Ontario
Fabrication And Characterization Of Cuins₂ And Cuinse₂ Light-Absorbing Thin Films For Use In Solar Cells, Amy R. Tapley
Electronic Thesis and Dissertation Repository
Solar energy is free and globally abundant and harnessed cost-effectively, it has the potential to be the world’s main source of energy. CuInGa(S,Se)2 solar cells have a very high efficiency of 20 %. However, gallium is a rare and expensive element. We have decided to work on its alternative CuInSe2 (CISe) and CuInS2 (CIS) by removing gallium or both gallium and selenium. The p-type CISe or CIS light-absorbing semiconducting layer is crucial for this type of solar cell. Preparation methods for CIS and CISe films were developed to reduce the costs and enhance the photoelectrochemical ...
Instrumental Aspects Of Oxygen Sensing: Quantitation And Recalibration Of A Biofouled Oxygen Sensor, 2017 University of Arkansas, Fayetteville
Instrumental Aspects Of Oxygen Sensing: Quantitation And Recalibration Of A Biofouled Oxygen Sensor, Marlena Patrick
Theses and Dissertations
In vivo oxygen sensing is a critical area of research for medical applications, such as ischemic stroke, but this important topic is not fully understood or resolved. In addition, the best method for calibration of in vivo sensors is as yet undetermined. For all implantable devices, biofouling, the adsorption of biological material to the device surface, is another significant problem with no clear or well-defined solution. One method employed is to apply a protective polymer membrane to the sensor surface in order to minimize the adsorption of biological material. The work described here investigates two polymers applied to a gold ...
Geochemical Fractionation, Speciation, And Bioavailability Of Heavy Metals In Stream Sediments In Aurora, Mo, 2017 Missouri State University
Geochemical Fractionation, Speciation, And Bioavailability Of Heavy Metals In Stream Sediments In Aurora, Mo, Miles Pearson
MSU Graduate Theses
Stream sediments from Chat Creek in Aurora, MO, part of the former Tristate Mining District, were digested via a sequential extraction procedure modeled after the Tessier method. Prior sampling had shown elevated levels of zinc, lead, and cadmium in sediments located near former chat piles. Metals in sediments were divided into four geochemical fractions: 1) easily exchangeable, 2) carbonate-bound, 3) iron-manganese oxides-bound, and 4) organic matter-bound. The distribution of the metals within these fractions can help predict the bioavailability and speciation of said metals. The majority of metals were contained in the third and to a lesser extent the fourth ...
New Optical And Electrochemical Probes For Trace Chemicals With Health And Environmental Impacts, 2017 University of Tennessee, Knoxville
New Optical And Electrochemical Probes For Trace Chemicals With Health And Environmental Impacts, Thomas Stewart Carpenter
The work in this dissertation focuses on the development of probes for the analysis of trace chemicals in samples with health and environmental impacts. A paper, Cu(copper)-based colorimetric probe was developed for the detection of toxic hydrogen sulfide (H2S) gas. A modified Kipp’s apparatus was used to generate desired concentrations of H2S in a total volume of 1.35 L (liters). The probe shows a qualitative response down to 60 ppb (parts per billion), indicating its ability to be used in industrial settings as a replacement for the commonly used lead acetate strips ...
Controlled Electrochemical Synthesis Of Single One-Dimensional Metal Nanochains Across Microgap Electrodes., 2017 University of Louisville
Controlled Electrochemical Synthesis Of Single One-Dimensional Metal Nanochains Across Microgap Electrodes., Amareshwari Konutham
Electronic Theses and Dissertations
This study mainly focuses on the fabrication of single one dimensional (1D) NP chains across the 5-micron gap of Au two electrode devices (TED). This has been achieved by electrochemical deposition of Ag onto the two electrodes, soaking the TED in 0.1 M Cetyltrimethyl ammonium bromide for 2-3 hours, and then close monitoring of the current as a function of time while a voltage across the two Ag coated Au electrodes in air. One dimensional Ag nanoparticle chain formation occurred by oxidation of Ag to Ag+ at the positive electrode followed by movement of Ag+ ions to the negative ...
Determination Of Iron Content In Water, 2017 Governors State University
Determination Of Iron Content In Water, Sreenivasareddy Annem
All Capstone Projects
An easy, efficient and safe method was developed to determine iron in water samples. The method is an Iron Cell Test kit from Spectroquant in which firstly all iron ions are reduced to iron (II) ions by ascorbic acid. In a thioglycolate buffered medium, iron (II) reacts with a triazine derivative to form a purple complex that is determined photometrically. Calibration curve of iron standards was done with concentrations of 0.50, 1.0, 2.0, 3.0 and 4.0 ppm and it gave a R2 value of 0.9989 and straight line equation y=0.4749x-0.046. Iron ...
Magnetic Nanostructure Application In Sers Detection Of Melatonin And Resonance Raman Characterization Of Binding Of Catechol Moieties With Antibiotic, Siqi Sun
Graduate Theses and Dissertations
Raman spectroscopy provides characteristic peaks of the target molecules that can be observed with appropriate laser, spectrometer and detector. These characteristic peaks can reveal ‘fingerprint’ information of a molecule even in a myriad of cases and combinations. It makes Raman spectroscopy a highly sensitive and selective analytical technique. Raman spectroscopy has a variety of chemical, environmental and biological applications. In this dissertation, modified Raman method are applied in life sciences and pharmaceutical studies.
The major challenge against development of Raman spectroscopy is how to improve the intensity of Raman signal. Surface Enhance Raman Scattering (SERS) and resonance Raman(RR) are ...
Synthesis Of Au/Ag, Pd/Ag And Pt/Ag Nanoparticles By Galvanic Replacement Reaction, 2017 Governors State University
Synthesis Of Au/Ag, Pd/Ag And Pt/Ag Nanoparticles By Galvanic Replacement Reaction, Sunnith Kumar Admala
All Capstone Projects
In recent years, galvanic replacement reactions have been successfully employed to produce bimetallic nanoparticles of a range of shapes, yet to date very few efforts have been devoted to develop methods for synthesizing smaller (<10nm) M/Ag; M=Au, Pt, Pd alloy particles using Ag hollow particles as sacrificial template. In this research work, we investigated new approach for the controllable synthesis of Au/Ag, Pd/Ag, and Pt/Ag alloy nanoparticles by applying galvanic replacement reaction on hollow Ag template in the presence of gold, palladium, and platinum salts. According to TEM analysis, the sizes of Au/Ag, Pd/Ag, and Pt/Ag alloy particle are 7.0±1.6 nm, 6.0±1.2 nm, and 3.0±0.8 nm, respectively. According to the study of optical property measurements on Ag hollow samples with increasing Au, Pt, and Pd content, it was observed that surface plasmon resonance peaks of the Au/Ag particles prepared with higher concentrated HAuCl4 solutions absorb at longer wavelengths and are red-shifted compared to the surface plasmon resonance of Ag hollow template. In the case of adding K2PdCl4 to Ag hollow sample resulted in blue shift of surface Plasmon resonance peaks for initial addition of palladium salt and further addition of K2PdCl4 caused the Plasmon peaks to diminish. Interestingly, our attempt to make Pt/Ag particle by reacting Ag hollow particles with various amounts of K2PtCl4 revealed that resulting alloy particles could still exhibit surface Plasmon resonance peaks for higher Pt content. Usually Pt and Pd nanoparticles do not exhibit surface plasmon resonance peaks in the visible spectrum. This work provides a model for a design of M/Ag; M=Au, Pt, Pd alloy particles, where combining Ag hollow samples with increasing amounts of Au, Pt, and Pd can provide successful execution of tenability of surface plasmon resonance.