Visualization Without Vision – How Blind And Visually Impaired Students And Researchers Engage With Molecular Structures, 2020 University of California, Davis
Visualization Without Vision – How Blind And Visually Impaired Students And Researchers Engage With Molecular Structures, Croix J. Laconsay, Henry B. Wedler, Dean J. Tantillo
Journal of Science Education for Students with Disabilities
This article examines the tools and techniques currently available that enable blind and visually impaired (BVI) individuals to visualize three-dimensional objects used in learning chemistry concepts. How BVI individuals engage with and visualize molecular structure is discussed and recent tactile (or haptic) and auditory methods for visualization of various chemistry concepts are summarized. Remaining challenges for chemistry education researchers are described with the aim of highlighting the potential value of educational research in further enabling BVI students to pursue careers in science, technology, engineering, and mathematics (STEM) fields.
Synthesis And Evaluation Of Novel Biologically Active Compounds, 2020 University of New Orleans
Synthesis And Evaluation Of Novel Biologically Active Compounds, Madhurima Das
University of New Orleans Theses and Dissertations
SCP-1, a potent derivative of acetaminophen, exhibits significantly diminished hepatotoxicity and nephrotoxicity relative to acetaminophen and nitrate ester derivatives of acetaminophen. It was therefore of interest to explore the development of nitric oxide donor analogs of SCP-1 to identify compounds that could have enhanced analgesic and/or antipyretic activity while taking advantage of the very low liver and kidney toxicity inherent to SCP-1. In this project, a series of nitrate ester analogues of the SCP-1 were prepared as potential nitric oxide donors. The synthesis of SCP analogs was achieved by triflic acid catalyzed O-acylation of SCP-1 with chloroalkanoyl chlorides followed ...
Isolation, Identification, And Investigation Of A Novel Bioactive Furanocoumarin From Leaves Of Amyris Elemifera, 2020 University of Mississippi
Isolation, Identification, And Investigation Of A Novel Bioactive Furanocoumarin From Leaves Of Amyris Elemifera, Amy K. Bracken
Plants produce biologically active compounds that humans have utilized for many agricultural applications. Amyris elemifera was investigated due to the known bioactivity of its family, Rutaceae, and its use in medicines in tribes of the Bahamas. Biotage® and TLC guided fractionation of the EtOAc, hexane, and MeOH extracts of the leaves of Amyris elemifera yielded bioactive compounds. Most significantly, a novel furanocoumarin, 8-(3-methylbut-2-enyloxy)-marmesin acetate (1), and its analog 8-(3-methylbut-2-enyloxy)-marmesin (2), were isolated. The structures were identified via NMR and X-ray crystallography techniques; the X-ray crystal structure for 1 was reported for the first time, and the ...
Approaches Towards The Synthesis Of Ketamine Metabolites, 2020 University of Mississippi
Approaches Towards The Synthesis Of Ketamine Metabolites, Ann K. Patrick
Major Depressive disorder (MDD) plagues society and stands at the forefront of research as MDD affects approximately 16% of the population. Pharmaceutical drugs, including the selective serotonin reuptake inhibitors (SSRIs), have been used for MDD treatment and remain a popular option today. However, current antidepressant treatments have proven to be ineffective in just less than half of the patients. Research continues with the goal to better understand the mechanisms of the pathology of depression and to search for other treatment options. For example, the stress-neurogenesis hypothesis investigates the role of stress and decreased neuroplasticity within MDD.
Supporting the stress-neurogenesis hypothesis ...
Silver-Catalyzed Synthesis Of Disubstituted Fluorinated Isoxazoles, 2020 University of Mississippi
Silver-Catalyzed Synthesis Of Disubstituted Fluorinated Isoxazoles, Micah Stewart
The presence of fluorine can provide organic compounds with useful biological properties, such as increased metabolic stability and drug uptake. Because of these advantages, fluorinated compounds make up about 30% of the drug industry. However, fluorination of complex molecules is difficult due to fluorine’s high electronegativity.
Fluorinated isoxazoles are of particular interest in the pharmaceutical industry. Isoxazoles are five-membered heterocycles with oxygen and nitrogen in the 1, 2 positions that are able to engage in interactions unavailable to other ring structures, conferring advantageous biological properties upon compounds containing them. However, there are limited synthetic routes for fluorinated isoxazoles, and ...
Magnetic Ionic Liquids As Solvents For Rna Extraction And Preservation, 2020 Iowa State University
Magnetic Ionic Liquids As Solvents For Rna Extraction And Preservation, Chenghui Zhu, Marcelino Varona, Jared L. Anderson
Ribonucleic acid (RNA) is particularly sensitive to enzymatic degradation by endonucleases prior to sample analysis. In-field preservation has been a challenge for RNA sample preparation. Very recently, hydrophobic magnetic ionic liquids (MIL) have shown significant promise in the area of RNA extraction. In this study, MILs were synthesized and employed as solvents for the extraction and preservation of RNA in aqueous solution. RNA samples obtained from yeast cells were extracted and preserved by the trihexyl(tetradecyl) phosphonium tris(hexafluoroacetylaceto)cobaltate(II) ([P66614+][Co(hfacac)3–]) and trihexyl(tetradecyl) phosphonium tris(phenyltrifluoroacetylaceto)cobaltate(II) ([P66614+][Co(Phtfacac)3–]) MIL with a ...
Determination Of Thermodynamic Properties Of Non-Protein Amino Acids And Characterization Of Multimers Of Carbamazepine, Gwendylan Turner
Undergraduate Honors Theses
This study has two seemingly unrelated parts that come together remarkably in displaying the comprehensive interplay between chemical structure and properties as well as the variety of analytical applications of mass spectrometry.
The first part of this study describes the determination of thermodynamic properties of several non-protein amino acids using the extended kinetic method. This is a continuation of work started in the Poutsma lab in Spring of 2017. The non-protein amino acids (NPA) studied here hold notable relevance in their unique ability to be mis-incorporated into peptide chains, as shown by the Hartman group at Virginia Commonwealth University.[1 ...
Rna Therapeutics: Informational Drugs As A Pandemic Response Tool, 2020 University of Massachusetts Medical School
Rna Therapeutics: Informational Drugs As A Pandemic Response Tool, Anastasia Khvorova
UMass Center for Clinical and Translational Science Seminars
This presentation, hosted by the Community Engagement and Research Section, University of Massachusetts Medical School Center for Clinical and Translational Science, describes the development of siRNA-based approaches for modulation of COVID-19 in the lung in a three-month time frame.
This talk was the second in the COVID-19 Research Community Forum webinar series, a collaboration of the four federally-funded Clinical and Translational Science Awardees (CTSA) in Massachusetts, that provided an opportunity for community members, institutions and other organizations to be part of the discussions surrounding the COVID-19 pandemic. The MA CTSAs, consisting of the UMass Center for Clinical and Translational Science ...
Computational Chemistry - Ulk 101, 2020 Olivet Nazarene University
Computational Chemistry - Ulk 101, Michaela Montpas
Scholar Week 2016 - present
Autophagy is a process that generates the necessary building components for cells by cytoplasmic breakdown of unnecessary materials (Martin, Celano, Solitro, Gunaydin, Scott, et. al., 2018). This is a survival technique for cells in times of stress, especially during periods of nutrient starvation. Cancer cells, unfortunately, benefit from this process due to their ability to flourish in nutrient-starved environments, becoming resistant to therapy. The primary protein in mammals responsible for this process is a serine/threonine kinase called ULK 1 (unc-51 like autophagy initiating kinase 1). As such, inhibitors of ULK 1 can be used in cancer therapies in order ...
Research And Review Of Polymethyl-Methacrylate Copolymers In The Development Of Enhanced Pharmaceutical Delivery Systems, Jake Dyess
Senior Honors Theses
The following thesis shall primarily explore the current research regarding the implementation of modifiable microscopic and nanoscopic polymer particles as novel pharmaceutical delivery systems. Polymethacrylate-based copolymers, such as EudragitTM, are sensitive to alterations in pH levels, becoming increasingly more soluble in response to an increase in pH. The selective solubility and modifiable nature of these polymers allows for greater flexibility of treatment options for patients (Patra et al., 2017). The wide range of functionality of polymethacrylate (PMA) may provide solutions to challenges relating to the current treatment and therapy of certain conditions. Research indicates that PMA based micro- and ...
Avoiding Drug Resistance By Substrate Envelope-Guided Design: Toward Potent And Robust Hcv Ns3/4a Protease Inhibitors, 2020 University of Massachusetts Medical School
Avoiding Drug Resistance By Substrate Envelope-Guided Design: Toward Potent And Robust Hcv Ns3/4a Protease Inhibitors, Ashley N. Matthew, Jacqueto Zephyr, Nageswara Rao Desaboini, Mina Henes, Wasih Kamran, Klajdi Kosovrasti, Adam Hedger, Gordon J. Lockbaum, Jennifer Timm, Akbar Ali, Nese Kurt Yilmaz, Celia A. Schiffer
University of Massachusetts Medical School Faculty Publications
Hepatitis C virus (HCV) infects millions of people worldwide, causing chronic liver disease that can lead to cirrhosis, hepatocellular carcinoma, and liver transplant. In the last several years, the advent of direct-acting antivirals, including NS3/4A protease inhibitors (PIs), has remarkably improved treatment outcomes of HCV-infected patients. However, selection of resistance-associated substitutions and polymorphisms among genotypes can lead to drug resistance and in some cases treatment failure. A proactive strategy to combat resistance is to constrain PIs within evolutionarily conserved regions in the protease active site. Designing PIs using the substrate envelope is a rational strategy to decrease the susceptibility ...
Assessing The Correlation Of Microscopy-Based And Volumetry-Based Measurements For Resin Swelling In A Range Of Potential Greener Solvents For Spps, 2020 Technological University Dublin
Assessing The Correlation Of Microscopy-Based And Volumetry-Based Measurements For Resin Swelling In A Range Of Potential Greener Solvents For Spps, Jordan K. Magtaan, Marc Devocelle, Fintan Kelleher
The degree of resin swelling in a particular solvent system is one of the critical parameters for SPPS, and for solid phase synthesis, in general. Methods used for measuring the degree of resin swelling include microscopy-based and volumetry-based methods. This study describes, and compares, the use of both methods for a number of commercially available resins commonly used in SPPS, with a range of solvents which have been identified in the literature as “greener” than DCM, DMF and NMP. The results were analysed by statistical methods and a significant correlation between the two distinct methods has been demonstrated for the ...
Analysis Of Hydroxychloroquine Interaction With Serum Proteins By High Performance Affinity Chromatography, 2020 University of Nebraska-Lincoln
Analysis Of Hydroxychloroquine Interaction With Serum Proteins By High Performance Affinity Chromatography, Kyungah Suh, Sadia Sharmeen, David S. Hage
Student Research Projects, Dissertations, and Theses - Chemistry Department
Personalized medicine or precision medicine has been an emerging market for better treatments of patients under varying physiological conditions.To improve the development of personalized medicine, a higher understanding of drug-protein binding between serum transport proteins and the unbound form of pharmaceuticals is needed. Human Serum Albumin (HSA) and Alpha1-acidglycoprotein (AGP) play a crucial role in pharmacokinetics as they are two most abundant transport serum proteins in body circulatory system. Inter-individual variabilities of serum proteins, such as the physiological condition of patients, have been believed to alter the drug-serum protein binding. Fig. 1 shows an example of the cause of ...
Force Field Development Of Β-Lactam Class Antibiotics, 2020 Southern Methodist University
Force Field Development Of Β-Lactam Class Antibiotics, Trevor Heinzmann
SMU Journal of Undergraduate Research
Molecular dynamics (MD) simulation is a computational chemistry technique used to observe how a molecular system behaves as time passes. MD is based on solving Newton’s equations of motion. This requires the use of force fields to describe the potential energy function of each different molecule type in molecular system. In order to develop a force field, charges, bonds, angles, and dihedrals must be parameterized to fit quantum mechanics (QM) data. By basing the force field on QM data, MD simulations have higher accuracy while still using the low computational cost of molecular mechanics. This project focuses on developing ...
Resolving The Puzzle Of Single-Atom Silver Dispersion On Nanosized Γ-Al2o3 Surface For High Catalytic Performance, 2020 Chinese Academy of Sciences
Resolving The Puzzle Of Single-Atom Silver Dispersion On Nanosized Γ-Al2o3 Surface For High Catalytic Performance, Fei Wang, Jinzhu Ma, Shaohui Xin, Qiang Wang, Jun Xu, Changbin Zhang, Hong He, Xiao Cheng Zeng
Faculty Publications -- Chemistry Department
Ag/γ-Al2O3 is widely used for catalyzing various reactions, and its performance depends on the valence state, morphology and dispersion of Ag species. However, detailed anchoring mechanism of Ag species on γ-Al2O3 remains largely unknown. Herein, we reveal that the terminal hydroxyls on γ-Al2O3 are responsible for anchoring Ag species. The abundant terminal hydroxyls existed on nanosized γ-Al2O3 can lead to single-atom silver dispersion, thereby resulting in markedly enhanced performance than the Ag cluster on microsized γ-Al2O3. Density-functional-theory calculations confirm that Ag atom is mainly anchored by the terminal hydroxyls on (100) surface, forming a staple-like local structure with each ...
Carbon Oxidation State In Microbial Polar Lipids Suggests Adaptation To Hot Spring Temperature And Redox Gradients, 2020 Arizona State University
Carbon Oxidation State In Microbial Polar Lipids Suggests Adaptation To Hot Spring Temperature And Redox Gradients, Grayson M. Boyer, Florence Schubotz, Roger E. Summons, Jade Woods, Everett L. Shock
Faculty Publications -- Chemistry Department
The influence of oxidation-reduction (redox) potential on the expression of biomolecules is a topic of ongoing exploration in geobiology. In this study, we investigate the novel possibility that structures and compositions of lipids produced by microbial communities are sensitive to environmental redox conditions. We extracted lipids from microbial biomass collected along the thermal and redox gradients of four alkaline hot springs in Yellowstone National Park (YNP) and investigated patterns in the average oxidation state of carbon (ZC), a metric calculated from the chemical formulae of lipid structures. Carbon in intact polar lipids (IPLs) and their alkyl chains becomes more ...
Surface Modification Of Silicon Nanowire Based Field Eﬀect Transistors With Stimuli Responsive Polymer Brushes For Biosensing Applications, 2020 Institute for Materials Science and Max Bergmann Center of Biomaterials
Surface Modification Of Silicon Nanowire Based Field Eﬀect Transistors With Stimuli Responsive Polymer Brushes For Biosensing Applications, Stephanie Klinghammer, Sebastian Rauch, Sebastian Pregl, Petra Uhlmann, Larysa Baraban, Gianaurelio Cuniberti
Faculty Publications -- Chemistry Department
We demonstrate the functionalization of silicon nanowire based field eﬀect transistors (SiNW FETs) FETs with stimuli-responsive polymer brushes of poly(N-isopropylacrylamide) (PNIPAAM) and poly(acrylic acid) (PAA). Surface functionalization was confirmed by atomic force microscopy, contact angle measurements, and verified electrically using a silicon nanowire based field eﬀect transistor sensor device. For thermo-responsive PNIPAAM, the physicochemical properties (i.e., a reversible phase transition, wettability) were induced by crossing the lower critical solution temperature (LCST) of about 32 ◦C. Taking advantage of this property, osteosarcomic SaoS-2 cells were cultured on PNIPAAM-modified sensors at temperatures above the LCST, and completely detached by ...
Synthesis, Characterization, And Biological Activity Of Imidazolium Salts, 2020 The University of Akron
Synthesis, Characterization, And Biological Activity Of Imidazolium Salts, David Weader
Williams Honors College, Honors Research Projects
Nonmuscle invasive bladder cancer (NMIBC) inflicts thousands of Americans annually, and is typically treated with the immunotherapy BCG. However, due to a BCG shortage, there is a new need for novel treatments of NMIBC. Addressing this issue, several imidazolium salt derivatives were synthesized and characterized with the intent of treatment within the bladder. These imidazolium salts were tested against different human bladder cancer cell lines in vitro to determine their reactivity and cytotoxicity. Among these results are GI50 concentrations for each drug, which is the concentration of drug needed to see growth inhibition in 50% of treated cells. Previous published ...
Synthesized Tripodal Amine As Potential Anti-Cancer Therapeutic, 2020 Georgia Southern University
Synthesized Tripodal Amine As Potential Anti-Cancer Therapeutic, Abigail G. Mcnamee
University Honors Program Theses
Cancer remains a prevalent disease today. This disease may manifest itself in many different ways and affect a variety of tissues with everything from the brain to the blood. With this wide diversity of cancer types, treatment can be complicated since there is not a “one size fits all” treatment for the disease. Surgery, radiation, and chemotherapy are all options that must be weighed with their benefits and side effects. Ultimately though, there are not enough effective treatment options available for every type of cancer. This leaves many with the grim prognosis of never being cured. With this clear need ...
Letetr Positively Regulates 3-Hydroxylation Of The Antifungal Hsaf And Its Analogs In Lysobacter Enzymogenes Oh11, 2020 University of Nebraska-Lincoln & Jiangsu Academy of Agricultural Sciences
Letetr Positively Regulates 3-Hydroxylation Of The Antifungal Hsaf And Its Analogs In Lysobacter Enzymogenes Oh11, Lingjun Yu, Vimmy Khetrapal, Fengquan Liu, Liangcheng Du
Liangcheng Du Publications
The biocontrol agent Lysobacter enzymogenes OH11 produces several structurally distinct antibiotic compounds, including the antifungal HSAF (Heat Stable Antifungal Factor) and alteramides, along with their 3-dehydroxyl precursors (3-deOH). We previously showed that the 3-hydroxylation is the final step of the biosynthesis and is also a key structural moiety for the antifungal activity. However, the procedure through which OH11 regulates the 3-hydroxylation is still not clear. In OH11, the gene orf3232 was predicted to encode a TetR regulator (LeTetR) with unknown function. Here, we deleted orf3232 and found that the LeTetR mutant produced very little HSAF and alteramides, while the 3-deOH ...