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Articles 31 - 60 of 218
Full-Text Articles in Chemistry
Photopolymers : Environmentally Benign Technology For A Variety Of Industries, Tatyana Tarasevich
Photopolymers : Environmentally Benign Technology For A Variety Of Industries, Tatyana Tarasevich
Legacy Theses & Dissertations (2009 - 2024)
Photopolymerization is a well-known process with applications in a variety of industries. Photopolymers are formed by a reaction of monomers or oligomers, photoinitiators and in some cases crosslinkers. Upon irradiation with UV or visible light, monomers undergo conformational change to form polymers via a photochemical process. Several photopolymerization types will be discussed in this thesis. End products of photopolymerizations included epoxies, inks, coatings, photoresists, etc.
Synthesis Of Oligonucleotides Containing Unnatural Backbone And Regulation Of Crispr Activity Using Inverse Electron Demand Diels-Alder Chemistry, Alyssa Hoy
Legacy Theses & Dissertations (2009 - 2024)
This thesis describes the synthesis of an oligonucleotide containing an unnatural neutralbackbone. The backbone was constructed using bio-orthogonal inverse electron demand Diels- Alder chemistry between trans-cyclooctene (TCO) and tetrazine (Tz). A TCO phosphoramidite was synthesized and attached to solid support for strand propagation. Uridine monomers containing either bis-TCO or bis-Tz were also synthesized. The oligonucleotide strand was formed by sequential ligation of the bis-Tz and bis-TCO monomers. The oligonucleotide was analyzed using mass spectrometry. This thesis also describes the synthesis of sgRNAs containing non-canonical nucleobases, m1A, m6A, s2U and s4U using the ‘split-and-click’ methodology. The synthetic sgRNAs were assembled using …
First Homoleptic Rare Rarth Metal Complexes With Doubly-Reduced Dibenzocyclooctatetraene, James C. Mahoney
First Homoleptic Rare Rarth Metal Complexes With Doubly-Reduced Dibenzocyclooctatetraene, James C. Mahoney
Legacy Theses & Dissertations (2009 - 2024)
A set of novel complexes of rare earth elements, M(III) = Y, La, Gd, Tb, and Dy, with the doubly-reduced dibenzo[a,e]cyclooctatetraene (DBCOT) anion has been synthesized and crystallographically characterized for the first time. Preparation of new complexes has been accomplished through the ligand-metathesis reaction of M(III) triiodides with K2(DBCOT) in THF at ambient conditions. Subsequent crystallization via slow solvent evaporation afforded single crystals of good quality. X-ray diffraction technique confirmed that all complexes are isomorphous and conform to the [M(DBCOT)(THF)4][M(DBCOT)2] composition. In their crystal structures, the monoanionic double-decker sandwiches, [M(DBCOT)2], weakly interact with the cationic counterparts, [M(DBCOT)(THF)4]+. In both parts, …
Uio-Type Metal-Organic Framework Derivatives As Sorbents For The Detection Of Gas-Phase Explosives, Matthew Ryan Sherrill
Uio-Type Metal-Organic Framework Derivatives As Sorbents For The Detection Of Gas-Phase Explosives, Matthew Ryan Sherrill
Legacy Theses & Dissertations (2009 - 2024)
The detection of energetic compounds – better known to the public as explosives – has is an important cornerstone of counterterrorism and homeland security . While significant advances have been achieved for the detection of trace explosives in various matrices such as soil, wastewater, and clothing, the detection of explosives in the gas phase remains challenging due to their infamously low vapor pressures. In this thesis, we leverage the high sensitivity of direct analysis in real-time mass spectrometry (DART-MS) and the microporosity of metal-organic frameworks (MOFs) to adsorb and therefore concentrate explosives from the vapor phase and subsequently detect them …
Development And Applications Of Touch Chemistry Biometrics Analysis Of Latent Fingermarks By Maldi-Ms, Cameron M. Longo
Development And Applications Of Touch Chemistry Biometrics Analysis Of Latent Fingermarks By Maldi-Ms, Cameron M. Longo
Legacy Theses & Dissertations (2009 - 2024)
Fingerprint evidence has long been a pillar of forensic science and has been used for over a century as a means of identifying an individual. This is accomplished through the comparison of friction ridge patterns, which are inherently unique to each individual, and the practice of visualizing fingerprints and comparing them has become a well-studied field. While these techniques have been optimized and improved over time, they generally rely only on the physical pattern to provide information about the donor, and not the content of the fingerprint material itself. In the modern era, steps have been made to extract from …
Discrimination Between Human And Non-Human Blood Using Raman Spectroscopy And A Self-Reference Algorithm For Forensic Purposes : Method Expansion And Validation, Harrison Dickler
Discrimination Between Human And Non-Human Blood Using Raman Spectroscopy And A Self-Reference Algorithm For Forensic Purposes : Method Expansion And Validation, Harrison Dickler
Legacy Theses & Dissertations (2009 - 2024)
Determining whether the origin of a bloodstain is human or non-human is an important capability of a forensic investigation. In their pioneering work, Bian et al. (Journal of biomedical optics, 2017) introduced a self-reference peak algorithm for the analysis of bloodstain Raman spectra and demonstrated a great potential of this approach for differentiating human and nonhuman blood. However, this work only used three non-human species in the creation of their model. This study investigates the capability of a self-referencing peak algorithm to discriminate between human and 18 non-human species based on the Raman spectra of blood samples. The intensity ratios …
Methodology Studies For Dearomatized Dimer And Beta-Lactone-Mediated Native Chemical Ligation In Organic Synthesis, Xinhao Fan
Legacy Theses & Dissertations (2009 - 2024)
Chapter 1: Dimers of naphthalenol derivatives were synthesized by photocatalysis, cobalt(II) acetylacetonate. Several functional groups were tolerant of its skeleton. This novel dimer was connected through a reversible sigma bond. Its reversibility was confirmed by chiral HPLC and 1H-NMR experiments. Through EPR and Stern-Volmer quenching experiments, we proposed the reaction mechanism. The reversibility property can be potentially beneficial in polymers, self-healing, and memory materials.Chapter 2: We report an epimerization-free native chemical ligation reaction by β-lactone-mediated peptides. This approach can achieve Thr-Xaa efficiently and rapidly. Besides, it has a broad side-chain tolerance. Through the competition reaction experiment, it was demonstrated that …
Development Of Bioaffinity Based Assays For Forensic Applications, Juliana Maria Agudelo Cano
Development Of Bioaffinity Based Assays For Forensic Applications, Juliana Maria Agudelo Cano
Legacy Theses & Dissertations (2009 - 2024)
In the field of forensic science, body fluids are a major contributor of evidence in investigations. However, body fluids are usually used only for their genetic content, overlooking its unique composition of proteins and low-molecular-weight compounds that often serve as biomarkers in clinical diagnostics. This investigation aimed to develop simple, effective, and economical models that can be used to identify different attributes of the originator. The focus of this research was to develop biocatalytic cascades that could analyze body fluids by using UV-Vis spectroscopy. These models could be implemented in forensic settings, as well as in biometric authentications. The central …
Development Of Visible-Light-Mediated Photoredox Catalysis, Sarbjeet Kaur
Development Of Visible-Light-Mediated Photoredox Catalysis, Sarbjeet Kaur
Legacy Theses & Dissertations (2009 - 2024)
ABSTRACT
Molecular Simulation Of Rna Conformational Dynamics : An Example Of Micro-Rna Targeting Messenger Rna : Mir-34a-Msirt1, Parisa Ebrahimi
Molecular Simulation Of Rna Conformational Dynamics : An Example Of Micro-Rna Targeting Messenger Rna : Mir-34a-Msirt1, Parisa Ebrahimi
Legacy Theses & Dissertations (2009 - 2024)
MicroRNA (miRNA), as a distinct class of biological regulators and a ”guide” member of non-coding RNA-protein complexes (RNPs), regulates more than 60% of protein-coding genes expression through base-pairing with targeted messenger RNA (mRNA) in the RNA-Induced Silencing Complex (RISC). Most of miRNAs identified in human, are conserved in other animals, which have preferentially conserved interaction sites particularly in 3’ untranslated regions (3’UTRs) of many human messenger mRNAs.The capability of a single miRNA to target more than hundreds of mRNAs, suggests that miRNAs influence essentially all developmental process and diseases, which also makes them interesting candidates as therapeutics agents. The primary …
Two Dimensional Nanoparticles/Nanozymes For Biosensing Augmented By Machine Learning, Nidhi Chintan Nandu
Two Dimensional Nanoparticles/Nanozymes For Biosensing Augmented By Machine Learning, Nidhi Chintan Nandu
Legacy Theses & Dissertations (2009 - 2024)
Biosensing is an ever-evolving field with many resources devoted towards new approaches in sensing and refining the existing methods. For a long time, such approaches involved use of state-of-the-art instruments and were often proved to be time consuming and expensive. Nanoparticles with their unique properties, inexpensive synthesis and ease of manipulation have found purpose in myriad fields including biosensing. Different nanoparticles based on their composition, morphology, dimensionality, and surface modifications have already gained foot hold in the biosensor ranks. The unique opto-electric properties due to the quantum effect in the nanoparticles have also made them one of the leading alternatives …
Molecular Simulation Of Rna Conformational Dynamics : An Example Of Micro-Rna Targeting Messenger Rna : Mir-34a-Msirt1, Parisa Ebrahimi
Molecular Simulation Of Rna Conformational Dynamics : An Example Of Micro-Rna Targeting Messenger Rna : Mir-34a-Msirt1, Parisa Ebrahimi
Legacy Theses & Dissertations (2009 - 2024)
MicroRNA (miRNA), as a distinct class of biological regulators and a ”guide” member of non-coding RNA-protein complexes (RNPs), regulates more than 60% of protein-coding genes expression through base-pairing with targeted messenger RNA (mRNA) in the RNA-Induced Silencing Complex (RISC). Most of miRNAs identified in human, are conserved in other animals, which have preferentially conserved interaction sites particularly in 3’ untranslated regions (3’UTRs) of many human messenger mRNAs.The capability of a single miRNA to target more than hundreds of mRNAs, suggests that miRNAs influence essentially all developmental process and diseases, which also makes them interesting candidates as therapeutics agents. The primary …
A Project To Dye For : Differentiation Of Dyed And Non-Dyed Human Hairs Using Atr Ft-Ir Spectroscopy, Joseph John Greco
A Project To Dye For : Differentiation Of Dyed And Non-Dyed Human Hairs Using Atr Ft-Ir Spectroscopy, Joseph John Greco
Legacy Theses & Dissertations (2009 - 2024)
IR spectroscopy is widely utilized for forensic purposes due to the chemical fingerprint the method provides. ATR FT-IR spectroscopy is particularly advantageous because it allows for spectra to be collected quickly, accurately, and perhaps most importantly for forensics, non-destructively. Human hair is commonly collected at a crime scene, and further analyzed using DNA analysis and microscopy. However, these techniques have limitations. In the past ATR FT-IR spectroscopy has shown promise in the analysis of human hair for forensic purposes. In this study, the differentiation of undyed hair versus dyed hair classes of varying colors based on their IR spectra were …
Polymers In Drug Delivery Systems, Aashay Paresh Pratap
Polymers In Drug Delivery Systems, Aashay Paresh Pratap
Legacy Theses & Dissertations (2009 - 2024)
Conventional drug delivery is associated with challenges such as low bioavailability, reduced half-life, nonspecific interactions, high immunogenicity, and degradation of drug before reaching the target. Modern drug delivery systems are designed to overcome the challenges of conventional drug delivery methods. Polymers play a crucial role in the development of modern drug delivery systems. Polymers form delivery vehicles that improve the therapeutic efficacy and reduce the side effects of a drug. Furthermore, it is possible to control the release of drug by using the delivery vehicles. Polymeric vehicles exist in different forms such as polymeric nanoparticles, hydrogels, and vesicles. Each form …
The Role Of Ammonia In Atmospheric New Particle Formation And Implications For Cloud Condensation Nuclei, Arshad Arjunan Nair
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 …
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 …
Utilizing Raman Spectroscopy To Determine The Time Since Deposition Of Heated Bloodstains, Alexis Pearl Barber
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 …
The Detection And Identification Of Blood On Interfering Substrates Using Raman Spectroscopy And Hamand For Forensic Purposes, Jalissa M. Thomas
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 …
Novel Functional Proteomics Techniques For Multiplex And Single Cell Cytokines Detection, Mohammed Abdullah
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 …
Missense Mutations In The Gamma Crystallins And Mechanisms Of Lens Opacity, Wenjuan Hou
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, …
Mass Spectral And Chemometric Analysis For The Detection And Identification Of Forensically Relevant Materials, Meghan Grace Appley
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) …
Legacy And Emerging Per- And Polyfluoroalkyl Substances : Analysis, Environmental Distribution, And Bioconcentration, Richard Anthony Brase
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 …
Application Of Direct Analysis In Real Time-High Resolution Mass Spectrometry To Genus- And Species-Level Differentiation And Identification Of Coral, Jessica Mary Hayes
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 …
Applications Of Mass Spectrometry To Forensic Entomology : Calliphoridae Species Determination, Monitoring Of Decomposition Volatiles, And Discovery Of Chemical Cues, Justine Elizabeth Giffen-Lemieux
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 …
Physical Characteristics And Microphysical Processing Of Atmospheric Aerosol In Rural And Urban New York State, Joseph Marto
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 …
Novel Sensing Concept For Organophosphate Monitoring, Cheyenne Bowman
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 …
Determining Donor Age Through Blood Analysis Using Attenuated Total Reflection Fourier Transform-Infrared (Atr Ft-Ir) Spectroscopy For Forensic Purposes, Samantha Leigh Giuliano
Determining Donor Age Through Blood Analysis Using Attenuated Total Reflection Fourier Transform-Infrared (Atr Ft-Ir) Spectroscopy For Forensic Purposes, Samantha Leigh Giuliano
Legacy Theses & Dissertations (2009 - 2024)
Chapter 1 of this thesis is an overview of the use of attenuated total reflection Fourier transform-infrared (ATR FT-IR) spectroscopy in industry and for examination of body fluids with emphasizes on examination of blood. It covers recent developments for analysis of samples with ATR FT-IR spectroscopy for forensic purposes.
Understanding The Rage Signaling Pathway And Its Contribution To Diabetic Complications, Leon Vegas Ho
Understanding The Rage Signaling Pathway And Its Contribution To Diabetic Complications, Leon Vegas Ho
Legacy Theses & Dissertations (2009 - 2024)
The binding of advanced glycation end products (AGEs) to the receptor for advanced glycation end products (RAGE) is an important feature of the RAGE signaling pathway that plays a role in the pathogenesis of diabetes. Under high glucose concentration, RAGE expression increases immensely from the formation of a Schiff base by glucose bounded to lysine. This triggers an inflammatory and immune response and upregulates the expression of RAGE and causes an accumulation of AGEs in the body. As a result, this leads to the development of diabetes and other complications such as, atherosclerosis, nephrothapy, and retinopathy. To remedy AGE accumulation, …
Novel Substrate-Free Cholinesterase Based Sensing Of Organophosphorus Compounds, Hailey J. Marini
Novel Substrate-Free Cholinesterase Based Sensing Of Organophosphorus Compounds, Hailey J. Marini
Legacy Theses & Dissertations (2009 - 2024)
The increasing concerns of chemical weapons used by terrorists is growing, creating a need for infield detection methods that can rapidly detect these compounds that are a major health concern for civilians and military personnel. Displacement is a novel concept for the detection of cholinesterase inhibitors, including organophosphorus compounds, that could replace the classical instrumentation methods currently being used for diagnostics.
Cholinesterase Based System For Fentanyl Detection, Alyssa Shoemaker
Cholinesterase Based System For Fentanyl Detection, Alyssa Shoemaker
Legacy Theses & Dissertations (2009 - 2024)
Opioids and other illicit drugs have become a very prevalent problem across the world, especially in the United States. In fact, every day more than 130 people die from an opioid overdose. Despite many public warnings explaining the risks of opioid and drug use, the epidemic has continued to grow. As illicit drugs are becoming more rampant in society, law enforcement officers need a reliable, rapid, and non-invasive method to detects when someone may be on drugs, for example while driving, and to assess unknown powders or substances when presented at a crime scene containing drugs. Currently, at traffic stops …