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2021

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Articles 1411 - 1440 of 1742

Full-Text Articles in Chemistry

Advanced Analytical Techniques For The Analysis Of Therapeutics Of Toxic Inhalation Agents And Pharmacokinetic Investigation, Subrata Bhadra Jan 2021

Advanced Analytical Techniques For The Analysis Of Therapeutics Of Toxic Inhalation Agents And Pharmacokinetic Investigation, Subrata Bhadra

Electronic Theses and Dissertations

Toxic inhalation agents (TIAs), (i.e., cyanide (CN) and reduced sulfur compounds (RSCs)), including hydrogen sulfide (H2S) and methanethiol (MT)) are extremely poisonous upon exposure. Many TIAs act by inhibiting mitochondrial cytochrome c oxidase, resulting in cellular hypoxia, cytotoxic anoxia, apnea, respiratory failure, cardiovascular collapse, seizure and potentially death. CN is generated in structural fires and cigarette smoke as well as in mining, electroplating and polymer processing, whereas H2S and MT are found in petroleum, oil and natural gas, waste treatment facilities and decaying organic matter. All are common occupational gas exposure hazards in chemical industries and for first responders, including …

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Induction And Prevention Of Electron Transport In Langmuir-Blodgett Films Of 3d-Based Metallosurfactants: Studies On Current Rectification And Corrosion Inhibition, Aldora Devale Kapuralalage Isuri Weeraratne Jan 2021

Induction And Prevention Of Electron Transport In Langmuir-Blodgett Films Of 3d-Based Metallosurfactants: Studies On Current Rectification And Corrosion Inhibition, Aldora Devale Kapuralalage Isuri Weeraratne

Wayne State University Dissertations

The work reported in this thesis focused on the use of redox-active metallosurfactants for current rectification and redox-innocent metallosurfactants for corrosion inhibition. These studies were done based on the hypothesis that redox-active metallosurfactnats can promote electron transport, while redox-innocent metallosurfactants can hinder electron transport. As such, new redox-active phenolate based iron(III), chromium(III), oxovanadium(IV) and redox-innocent gallium(III) and zinc(II) complexes were synthesized and characterized for the aforementioned applications. First, we studied the current rectification ability of a homobimetallic iron(III) hydrophobe with [N4O6] ligand environment. This complex displayed rectification with rectification ratio ranges from 2.6 to 9.8 between -2.0 and 2.0 V …

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Interactions Of Carbon Dioxide On Nickel Surface: A Reactive Molecular Dynamics Study Of Plasma- Catalysis, Leticia Adao Gomes Jan 2021

Interactions Of Carbon Dioxide On Nickel Surface: A Reactive Molecular Dynamics Study Of Plasma- Catalysis, Leticia Adao Gomes

Undergraduate Theses and Capstone Projects

The adsorption probability and reaction behavior of CO2 on nickel catalyst surfaces are investigated employing reactive molecular dynamics (MD) simulations using the ReaxFF potential. Such catalyst is used in the dry reforming reaction where greenhouse gases, carbon dioxide and methane, react producing synthesis gas, a potential clean energy source. However, this reaction is strongly endothermic due to the reactants' thermodynamic stability and requires a significant amount of energy. The selectivity and energy efficiency can be improved by combining a nonthermal plasma with a catalyst. Further insight into the underlying mechanisms of this process is needed to increase its applicability. Through …

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Removal Of Cod, Aromaticity And Color Of A Pretreated Chemical Producing Industrial Wastewater: A Comparison Between Adsorption, Ozonation, And Advanced Oxidation Processes, Elçi̇n Güneş, Deni̇z İzlen Çi̇fçi̇, Ali̇ Riza Di̇nçer, Yalçin Güneş Jan 2021

Removal Of Cod, Aromaticity And Color Of A Pretreated Chemical Producing Industrial Wastewater: A Comparison Between Adsorption, Ozonation, And Advanced Oxidation Processes, Elçi̇n Güneş, Deni̇z İzlen Çi̇fçi̇, Ali̇ Riza Di̇nçer, Yalçin Güneş

Turkish Journal of Chemistry

A wide range of products are produced in the chemical producing industry such as textile dyes, chemicals, printing dyes and chemicals, paper chemicals, electrostatic powder dyes, and optical brighteners. The aim of this study is to investigate the treatability of chemical oxygen demand (COD), aromaticity, and color in the wastewater of this sector, where highly complex chemicals are used. Most of the studies in the literature are related to the treatment of synthetically prepared dyed wastewater. This study is important as it is carried out with real wastewater and gives results of many treatment methods. In the study, COD, UV-vis …

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The Role Of Ammonia In Atmospheric New Particle Formation And Implications For Cloud Condensation Nuclei, Arshad Arjunan Nair Jan 2021

The Role Of Ammonia In Atmospheric New Particle Formation And Implications For Cloud Condensation Nuclei, Arshad Arjunan Nair

Legacy Theses & Dissertations (2009 - 2024)

Atmospheric ammonia has received recent attention due to (a) its increasing trend across various regions of the globe; (b) the associated direct and indirect (through PM2.5) effects on human health, the ecosystem, and climate; and (c) recent evidence of its role in significantly enhancing atmospheric new particle formation (NPF or nucleation) rates. The mechanisms behind nucleation in the atmosphere are not fully understood, although over the last decade there have been significant developments in our understanding. This dissertation aims at improving our understanding of atmospheric ammonia in the atmosphere, its spatiotemporal variability, its role in atmospheric new particle formation, and …

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Development Of Chemical Methods For Oligonucleotide Purification, Paramagnetic Labeling And Synthesis Of Dna-Based Advanced Materials, Muhan He Jan 2021

Development Of Chemical Methods For Oligonucleotide Purification, Paramagnetic Labeling And Synthesis Of Dna-Based Advanced Materials, Muhan He

Legacy Theses & Dissertations (2009 - 2024)

This thesis describes a chemical method for alternative oligonucleotide purification that is non-chromatographic and gel-free and allows to routinely synthesize and purify long functional RNA strands. The purification of long RNAs is based on the bio-orthogonal inverse electron demand Diels-Alder (IEDDA) chemistry between trans-cyclooctene (TCO) and tetrazine (Tz). Target oligonucleotide strands are selectively tagged with Tz and can be captured and purified from the failure sequences with immobilized TCO. RNA strands are synthesized on solid support through a photolabile linker to avoid the loss of Tz tag. Purity of the isolated oligonucleotides was evaluated using gel electrophoresis, HPLC and mass …

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Utilizing Raman Spectroscopy To Determine The Time Since Deposition Of Heated Bloodstains, Alexis Pearl Barber Jan 2021

Utilizing Raman Spectroscopy To Determine The Time Since Deposition Of Heated Bloodstains, Alexis Pearl Barber

Legacy Theses & Dissertations (2009 - 2024)

The development of novel forensic methods is a rapidly growing area within analytical chemistry. Analytical chemistry is well suited for forensic analyses as a plethora of information can be ascertained from utilizing a wide variety of techniques. At the scene of violent crimes, bloodstain evidence is one of the most frequently found and valuable types of evidence. This is because blood is a complex biological fluid which can provide crucial information during a forensic investigation including DNA evidence. The most informative form of analysis is DNA profiling, which potentially allows for the identification of an individual. However, there is more …

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The Detection And Identification Of Blood On Interfering Substrates Using Raman Spectroscopy And Hamand For Forensic Purposes, Jalissa M. Thomas Jan 2021

The Detection And Identification Of Blood On Interfering Substrates Using Raman Spectroscopy And Hamand For Forensic Purposes, Jalissa M. Thomas

Legacy Theses & Dissertations (2009 - 2024)

Body fluids, such as blood and semen, can provide invaluable information to a criminal investigation. As such, it is imperative that body fluid evidence is properly detected and identified. Our laboratory has developed a methodology to universally detect and identify body fluids using Raman spectroscopy and chemometrics. This methodology was developed under ideal conditions, which are rare in the field. Body fluid evidence can be found on substrates that produce a large Raman signal that can hinder detection of body fluid traces, which produce a weak signal. This project proposes the use of a statistical program called HAMAND (Hypothetical Addition …

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Novel Functional Proteomics Techniques For Multiplex And Single Cell Cytokines Detection, Mohammed Abdullah Jan 2021

Novel Functional Proteomics Techniques For Multiplex And Single Cell Cytokines Detection, Mohammed Abdullah

Legacy Theses & Dissertations (2009 - 2024)

Since the early stages of biological research, the vital role of molecules in living creatures has been investigated and documented. According to Francis Watson's definition of the central dogma of biology, proteins are the final product of molecular biology and can't transfer information to other proteins like DNA or mRNA. Therefore, they are considered as the functional molecules of biology making them are more clinically relevant. However, the available techniques to study the protein characters, which coined laterally as proteomics science, are not well developed as genomics techniques did. Since the first human genome project is finished, the cost of …

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Missense Mutations In The Gamma Crystallins And Mechanisms Of Lens Opacity, Wenjuan Hou Jan 2021

Missense Mutations In The Gamma Crystallins And Mechanisms Of Lens Opacity, Wenjuan Hou

Legacy Theses & Dissertations (2009 - 2024)

Cataract, or clouding of the ocular lens, among the most common types of eye diseases, is the leading cause of blindness worldwide. With the opacity or clouding of the lens, light incident on the lens is scattered rather than being transmitted and is thus prevented from focusing on the retina. The lens becomes cataractous due to a large number of reasons, among which aging and genetic mutations are two of the most common factors. Clouding of the center of the lens or nuclear opacity, is the most frequently observed type of age-onset cataract, as well as inherited, congenital cataract [1, …

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Mass Spectral And Chemometric Analysis For The Detection And Identification Of Forensically Relevant Materials, Meghan Grace Appley Jan 2021

Mass Spectral And Chemometric Analysis For The Detection And Identification Of Forensically Relevant Materials, Meghan Grace Appley

Legacy Theses & Dissertations (2009 - 2024)

Forensic science is the application of science to the law which in and of itself covers a substantial number of disciplines. Many of these involve the detection and identification of materials using analytical techniques. Traditional analysis methods include microscopy, spectroscopy and mass spectrometry. The materials encountered by forensic practitioners are ever evolving, resulting in the need to develop new methods to complement conventional techniques to enhance the evidentiary value of the samples. The research presented here shows that novel methods including direct analysis in real time–high-resolution mass spectrometry (DART-HRMS), thermal desorption coupled with gas chromatography-mass spectrometry (TD-GC-MS), solid-phase microextraction (SPME) …

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Legacy And Emerging Per- And Polyfluoroalkyl Substances : Analysis, Environmental Distribution, And Bioconcentration, Richard Anthony Brase Jan 2021

Legacy And Emerging Per- And Polyfluoroalkyl Substances : Analysis, Environmental Distribution, And Bioconcentration, Richard Anthony Brase

Legacy Theses & Dissertations (2009 - 2024)

Per- and polyfluoroalkyl substances (PFAS) constitute a broad class of anthropogenic chemicals that have been used in numerous industrial and consumer-product applications since the late 1940s. The environmental persistence of these compounds in combination with their widespread commercial use have led PFAS to be recognized as contaminants of concern on the global scale. Despite regulatory efforts calling for the decreased use of certain perfluorocarboxylic and -sulfonic acids referred to as “legacy” PFAS, these compounds continue to be detected in both environmental and biological matrices. Moreover, manufacturers have begun to replace the legacy PFAS with emerging alternatives for which the regulations …

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Application Of Direct Analysis In Real Time-High Resolution Mass Spectrometry To Genus- And Species-Level Differentiation And Identification Of Coral, Jessica Mary Hayes Jan 2021

Application Of Direct Analysis In Real Time-High Resolution Mass Spectrometry To Genus- And Species-Level Differentiation And Identification Of Coral, Jessica Mary Hayes

Legacy Theses & Dissertations (2009 - 2024)

Coral reefs are one of the most biologically diverse ecosystems, and the accurate identification of the species is essential for diversity assessment, species delimitation and conservation. Current species and genus determination approaches are time consuming, resource intensive and can be highly subjective. To explore the hypothesis that the small molecule profiles of coral are species and genus specific, and can be used as a rapid tool to catalogue, classify and identify coral genera and species, the small-molecule chemical fingerprints of coral belonging to the species Acanthastrea echinata, Catalaphyllia jardinei, Duncanopsammia axifuga, Echinopora lamellosa, Euphyllia divisa, Euphyllia paraancora, Euphyllia paradivisa, Galaxea …

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Applications Of Mass Spectrometry To Forensic Entomology : Calliphoridae Species Determination, Monitoring Of Decomposition Volatiles, And Discovery Of Chemical Cues, Justine Elizabeth Giffen-Lemieux Jan 2021

Applications Of Mass Spectrometry To Forensic Entomology : Calliphoridae Species Determination, Monitoring Of Decomposition Volatiles, And Discovery Of Chemical Cues, Justine Elizabeth Giffen-Lemieux

Legacy Theses & Dissertations (2009 - 2024)

Forensic entomology is the study of insects that colonize human/animal wounds and remains and their development for use in legal contexts. It has numerous facets and applications including: estimation of time since death; investigation of neglect/abuse of children and the elderly; and determination of the presence of toxins and drugs as a potential cause of death. In order for the discovered insects to be of forensic utility, accurate species identification is crucial. Current methodologies for species determination rely on the knowledge and expertise of an entomologist; exhaustive taxonomic keys; and access to adequate equipment and facilities; resources which are often …

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Physical Characteristics And Microphysical Processing Of Atmospheric Aerosol In Rural And Urban New York State, Joseph Marto Jan 2021

Physical Characteristics And Microphysical Processing Of Atmospheric Aerosol In Rural And Urban New York State, Joseph Marto

Legacy Theses & Dissertations (2009 - 2024)

Atmospheric aerosol has profound impacts on air quality, though particles of differing sizes can have profoundly different characteristics which are understated when measurements are reported as a single parameter (typically number concentration or total mass). To address some of these concerns and to better understand the nature of atmospheric aerosol, continuous particle size distributions have been measured at two sites in New York State. Measurement was performed for particle diameters between 7.6nm - 20µm at Pinnacle State Park (Addison, New York; March 2017-April 2018) and Queens College (May 2018-September 2019) at a 5-minute time resolution. At Pinnacle State Park, aerosol …

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Novel Sensing Concept For Organophosphate Monitoring, Cheyenne Bowman Jan 2021

Novel Sensing Concept For Organophosphate Monitoring, Cheyenne Bowman

Legacy Theses & Dissertations (2009 - 2024)

Organophosphates are a group of insecticides that are commonly used as chemical warfare agents (CWAs), since they can act as nerve agents by inhibiting acetylcholinesterase. Acetylcholinesterase is a vital enzyme of the central nervous system (CNS). This enzyme facilitates the breakdown of acetylthiocholine into thiocholine and acetate. The major goal of the research will be to provide a preliminary rapid, sensitive, and reliable method for sensing organophosphates. Current methods are enzyme inhibition-based – that is, a decrease in absorbance or signal yields a positive indicator for the presence of analyte. Herein, two different novel approaches to organophosphate sensing are described.The …

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Statistical Significant Differences Between Aroma Profiles Of Beer Brewed From Sorghum, Drew Budner, Joseph Carr, Brett Serafini, Samantha Tucker, Elisabeth Dieckman‐Meyer, Lindsey Bell, Katherine A. Thompson‐Witrick Jan 2021

Statistical Significant Differences Between Aroma Profiles Of Beer Brewed From Sorghum, Drew Budner, Joseph Carr, Brett Serafini, Samantha Tucker, Elisabeth Dieckman‐Meyer, Lindsey Bell, Katherine A. Thompson‐Witrick

Chemistry

There is currently an increased demand for foodstuffs that are classified as gluten‐free including beer. Beer produced using gluten‐free grains has a distinct flavor profile that differs greatly from that of beer produced from gluten‐containing grains. The chemical difference between beers made from these two different grain sources has been explored and some key differences have been identified. Here malt sources containing gluten (barley) and malt without gluten (sorghum) were used to determine which compounds are statistically different based upon their concentrations. A total of 14 (7 barley and 7 sorghum) small‐batch beers were made from malt extract. The aroma …

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Soils Varying Importance And Differences, Kylie Fouss Jan 2021

Soils Varying Importance And Differences, Kylie Fouss

Natural Sciences Student Research Presentations

No abstract provided.

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Effects Of Soil Pollution On Human Health, Jaylen L. Haynes Jan 2021

Effects Of Soil Pollution On Human Health, Jaylen L. Haynes

Natural Sciences Student Research Presentations

No abstract provided.

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Cancer And Soil Pollution, Stephanie Thomas Jan 2021

Cancer And Soil Pollution, Stephanie Thomas

Natural Sciences Student Research Presentations

No abstract provided.

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Soils Project, Angela Maligaya Jan 2021

Soils Project, Angela Maligaya

Natural Sciences Student Research Presentations

No abstract provided.

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Chemistry 141 Fall 2021 Soils Project, Josh Li Jan 2021

Chemistry 141 Fall 2021 Soils Project, Josh Li

Natural Sciences Student Research Presentations

My literature research project focused on the use of electronics in an automated crop -watering system. It detects when the moisture of soil is too low and automatically waters it until its moisture is high enough to sustain the crops until the next automatic watering ( Đuzi ć and Đumi ć 2).

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Enhanced Electrochemical And Light-Driven Co2 Reduction By Incoporating Pendant Functionality In The Second-Coordination Sphere Of Molecular Catalysts, Sayontani Sinha Roy Jan 2021

Enhanced Electrochemical And Light-Driven Co2 Reduction By Incoporating Pendant Functionality In The Second-Coordination Sphere Of Molecular Catalysts, Sayontani Sinha Roy

Electronic Theses and Dissertations

With the increase in global population and rapid industrialization, a gigantic amount of greenhouse gases is being released into the atmosphere each year. The catastrophic effect of these accumulated greenhouse gases is driving global climate change and adversely impacting our ecosystem. Popularizing the traditional renewable energy sources (such as solar and wind energy) can mitigate the problem by cutting down anthropogenic CO2 emissions, which is the major contributor to this global problem. However, the intermittent nature of these energy sources is problematic to reliably power society throughout the year. Therefore, converting CO2 to various value-added chemicals with the aid of …

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Determination Of Volatile Compounds In Yellow Curry Paste Using From-Two-To-One Dimensional Gas Chromatography-Mass Spectrometry, Natsuda Singtothog Jan 2021

Determination Of Volatile Compounds In Yellow Curry Paste Using From-Two-To-One Dimensional Gas Chromatography-Mass Spectrometry, Natsuda Singtothog

Chulalongkorn University Theses and Dissertations (Chula ETD)

In this work, an approach to allow improved analysis with one-dimensional GC-MS (1D GC-MS) was established and demonstrated for analysis of a pool of yellow curry paste samples. The approach involved initial application of comprehensive heart cut two-dimensional GC-MS (CH/C 2D GC-MS) to obtain a full volatile profile by comparing the experimental mass spectrum and retention index of each compound with the mass spectra and retention indices of standard compounds from a database. The obtained volatile profile was then used to generate a selected ion monitoring (SIM) method, which was then applied with 1D GC-MS using a SIM mode. This …

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Functionalization Of Novel Pp5 Inhibitors, Hope P. Hill Jan 2021

Functionalization Of Novel Pp5 Inhibitors, Hope P. Hill

Honors Theses

The overexpression of protein phosphatase 5 has been correlated to tumor cell reproduction making it a candidate for small molecule drug therapy. Selective and potent inhibition of protein phosphatase 2A (PP2A) enzyme has been previously achieved through the development of the molecule fostriecin with key functionality being a lactone and unsaturated linear chain. The large synthetic overhead of fostriecin has led to exploration of other small molecule inhibitors that could mirror fostriecin’s interaction with the active site in the catalytic domain of PP5. The naturally occurring inhibitor, cantharidin, is functionalized with an epoxy containing eleven carbon chain to optimize binding …

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Green Dehydrogenation Of Dimethylamine Borane Catalyzed By Cheaply Copper(0) Nanocatalysts Without Any Stabilizer At Nearly Room Temperature, Ali̇ Özdemi̇r, Si̇bel Duman Jan 2021

Green Dehydrogenation Of Dimethylamine Borane Catalyzed By Cheaply Copper(0) Nanocatalysts Without Any Stabilizer At Nearly Room Temperature, Ali̇ Özdemi̇r, Si̇bel Duman

Turkish Journal of Chemistry

In this work, the findings of the work on the green dehydrogenation behavior of molten dimethylamine borane (DMAB) catalyzed by the precatalyst copper(II) acetylacetonate (Cu(acac)2) in solvent-free medium (green) at near room temperature (nRT, 30.0+0.1°C) were reported. Herein, a complete study has been presented, which includes the following steps: (i) synthesis and catalytic activity of Cu(0) NCats in solvent-free medium, (ii) determination of activation energy for Cu(0) NCats catalyzed green dehydrogenation of DMAB, (iii) demonstration of catalytic lifetime of Cu(0) NCats, (iv) test of isolability and reusability of Cu(0) NCats, (v) poisoning experiments using carbon disulfide on a per-active-copper-atom basis, …

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The Application Of Qnmr For The Determination Of Rosuvastatin In Tablet Form, Gökhan Di̇kmen, Okan Uslu Jan 2021

The Application Of Qnmr For The Determination Of Rosuvastatin In Tablet Form, Gökhan Di̇kmen, Okan Uslu

Turkish Journal of Chemistry

In this study, quantative nuclear magnetic resonance (qNMR) method was used to determine the content of rosuvastatin in tablet. Linearity, range, limit of detection (LOD), limit of quantification (LOQ), accuracy, and precision were determined in validation study of rosuvastatin. Furthermore, validation study of rosuvastatin was performed with high performance liquid chromatography (HPLC). Uncertainties of qNMR and HPLC methods were determined using per EURACHEM/CITAC Guide CG 4 (3th edition), quantifying uncertainty in analytical measurement. qNMR and HPLC methods were linear in the ranges of 0.10 - 5.00 mg/mL and 0.001 - 0.0995 mg/mL, respectively and these lineraties indicate very good linearity …

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Quercetin Enhances Vitamin D2 Stability And Mitigate The Degradation Influenced By Elevated Temperature And Ph Value, Sukkum Ngullie Chang, Jeong Jun Lee, Hyun Jin Kim, Sun Chul Kang Jan 2021

Quercetin Enhances Vitamin D2 Stability And Mitigate The Degradation Influenced By Elevated Temperature And Ph Value, Sukkum Ngullie Chang, Jeong Jun Lee, Hyun Jin Kim, Sun Chul Kang

Turkish Journal of Chemistry

Vitamin D2 (vit. D2) is a nutraceutical essentially needed for good health. However, it is susceptible to oxygen and high temperature. The use of natural products such as bioflavonoids possessing anti-degradative effect of vit. D2 degradation has not been described before. A combinational effect of vit. D2 with quercetin showed a positive effect and inhibited vit. D2 degradation when exposed to high temperature (50 oC and 75 oC) at different time points. The results obtained revealed vit. D2 degradation was drastically increased with longer incubation under thermal treatment. However, quercetin and vit. D2 groups were able to significantly inhibit the …

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Analysis Of Sexual Lubricants As A Form Of Trace Evidence For Sexual Assault Cases, Brooke Baumgarten Jan 2021

Analysis Of Sexual Lubricants As A Form Of Trace Evidence For Sexual Assault Cases, Brooke Baumgarten

Electronic Theses and Dissertations, 2020-2023

A major gap in sexual assault casework is demonstrated when DNA is not recovered. Oftentimes, if DNA evidence is not present on the collection swabs, the sexual assault kit (SAK) is not further analyzed. Due to the "CSI effect," DNA is commonly understood as highly identifiable evidence, potentially leading to increased condom usage to eliminate or reduce DNA transfer during a sexual assault. Therefore, the analysis of condoms and sexual lubricants is pertinent. The purpose of this research is to develop analytical protocols to potentially connect unknown substances recovered in a SAK to known lubricant reference samples. Sexual lubricants were …

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College Of Natural Sciences 2021 Year-End Publication, College Of Natural Sciences Jan 2021

College Of Natural Sciences 2021 Year-End Publication, College Of Natural Sciences

College of Natural Sciences Newsletters and Reports

Page 2 Welcome, Table of Contents
Page 3 Our Departments: Highlights From 2021
Page 4 Overview of the College
Page 5 Overview of Bold & Blue
Pages 6, 7 Announcing the First Endowed Professorship in the College of Natural Sciences
Page 8 Spooky Science, Astronomy Outreach, SDSU Chemistry Research Features on Journal Cover
Page 9 Students Win Business Plan Competition With Aims to Improve Shelf Life of Produce, Summer Researchers
Page 10 NIH Grant Helps Unravel Rare Inflammatory Genetic Disorders, International Excellence in South Dakota
Page 11 The Next Frontier of Science Education: Virtual Reality, SDSU Researchers Uncover how Cancer …

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