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Articles 91 - 120 of 218
Full-Text Articles in Chemistry
Quantification Of Hemoglobin In Human Blood To Differentiate Individuals From One Another, Audrey Jeanne Auleley
Quantification Of Hemoglobin In Human Blood To Differentiate Individuals From One Another, Audrey Jeanne Auleley
Legacy Theses & Dissertations (2009 - 2024)
Blood is one of the principal sources of evidence in crime scene investigations. The level of hemoglobin in human blood is known to hardly fluctuate over time in a healthy adult patient. Using a method like the sodium lauryl sulfate (SLS) method for hemoglobin level determination is beneficial because SLS converts any other derivates of hemoglobin into methemoglobin. The amount of hemoglobin would be determined using the linear correlation between the absorbance of methemoglobin and its amount in blood samples. Those curves differ significantly from sample to sample. Therefore, a differentiation can be observed between the blood samples of different …
Saliva As A Diagnostic Biological Fluid And The Human Salivary Proteome, Jessica Ghassan Emsies
Saliva As A Diagnostic Biological Fluid And The Human Salivary Proteome, Jessica Ghassan Emsies
Legacy Theses & Dissertations (2009 - 2024)
Saliva is a unique biologic fluid that contains a varying spectrum of proteins, nucleic acids, electrolytes, and hormones.31 It is an exocrine secretion of the salivary glands which is hypotonic in nature with a pH of 7.2-7.4.31 Saliva plays an important role in the oral cavity.33 It lubricates, hydrates, and bathes the oral cavity, therefore, aiding speech and mastication.33 Saliva forms a barrier on the teeth, protects against demineralization, and aids in remineralization.33 Saliva is required for chewing and food bolus preparation, it contains enzymes necessary for digestion, and mediates the sense of taste.33 It also helps wound healing and …
Synthesis And Adsorption Experiments With Metal-Organic Frameworks For High School And Undergraduate Laboratory Settings, Kate Holley
Legacy Theses & Dissertations (2009 - 2024)
Seven experiments are described and outlined here that introduce high school and undergraduate students to metal–organic frameworks (MOFs) and their applications. The experiments were designed to be completed with basic laboratory equipment and supplies and without the use of expensive characterization instruments, simulating typical high school chemistry laboratory conditions. Students synthesized two well-known MOFs, HKUST-1 and aluminum fumarate, using simple, safe, and rapid methods (fast enough to be performed within the time constrains of a typical high school class). Students then use their synthesized MOFs to explore their inherent sorption properties. In one set of experiments, the synthesized MOFs are …
Accumulation And Spatial Distribution Of Lead And Other Trace Elements In Keratinized Tissues : Investigations Based On Analytical Atomic Spectrometry, Mina W. Tehrani
Accumulation And Spatial Distribution Of Lead And Other Trace Elements In Keratinized Tissues : Investigations Based On Analytical Atomic Spectrometry, Mina W. Tehrani
Legacy Theses & Dissertations (2009 - 2024)
Human biomonitoring for toxic metals such as lead (Pb) provides information about absorbed dose from all exposure routes, and is critical for identifying exposed individuals and assessing health risks. Blood Pb and bone Pb are the primary validated biomarkers for assessing short-term and historical Pb exposures, respectively, while non-traditional matrices, including keratinized tissues, can provide complementary exposure information. Hard keratinized tissues – including hair, nails, hooves, and horns – grow incrementally, potentially preserving chemical exposure histories over a span of days to years. Analytical limitations and poor interlaboratory reproducibility, however, have led to debate around the use of human nails …
Study Of Small Molecules With Dna Monolayers On Gold Electrodes Using Electrochemical Quartz Crystal Microbalance On The Millisecond Timescale, Sarasi Kaushalya Kumari Galagedera
Study Of Small Molecules With Dna Monolayers On Gold Electrodes Using Electrochemical Quartz Crystal Microbalance On The Millisecond Timescale, Sarasi Kaushalya Kumari Galagedera
Legacy Theses & Dissertations (2009 - 2024)
Biosensors based on DNA self-assembled monolayers (SAMs) combined with electrochemical transducers have shown great potential to serve an important role in simple, accurate and inexpensive genetic analyses relevant to many fields. The most popularly adapted method in designing biosensing platforms is the self-assembly of 5’-alkylthiol-modified single stranded or double stranded DNA on gold surfaces followed by a passivation step using a diluent like mercaptohexanol (MCH). Since analytical performance (sensitivity, selectivity and stability) of such sensors is solely related to the probe surface architecture, methods to characterize and measure the surface density has gained a lot of interest among the scientific …
Computational Modeling As A Tool For Designing Ligands And Receptors, Waqas S. Awan
Computational Modeling As A Tool For Designing Ligands And Receptors, Waqas S. Awan
Legacy Theses & Dissertations (2009 - 2024)
Computational methods can be used for a wide range of applications, especially regarding DNA and RNA. Interactions such as sugar torsions, receptor-ligand interactions, ligand docking/drug docking, receptor modeling, and drug design are excellent candidates for computational analysis and in silico experiments. The use of molecular dynamics software (GROMACS) coupled with molecular design software (MOE) produce insights that may have been otherwise difficult to assess. All these problems are academic in nature but have practical uses outside of academia. Understanding alternate linkages can lead to antibiotic assays to address potential superbug epidemics. Modeling DNA superstructures can provide insight into how large …
Chemical Reduction Of Polycyclic Aromatic Ligands With Heavy Group 2 Metals, Andrew Robert Uresk
Chemical Reduction Of Polycyclic Aromatic Ligands With Heavy Group 2 Metals, Andrew Robert Uresk
Legacy Theses & Dissertations (2009 - 2024)
The chemistry of the alkaline earth metals has received a renewed interest in the last decades. The lighter Group 2 metal, magnesium, has gathered the most attention, as it is a key component of Grignard reagents, while the heavier metals have been less studied. The early alkaline earth metals are known to exhibit some similarity with both the alkali and lanthanide metals in π-complexation reactions with planar aromatic hydrocarbons (PAHs). However, the products of heavier Group 2 elements such as strontium and barium were found to be more difficult to synthesize and isolate, thus requiring the development of new synthetic …
Stargazin And Gamma-4 Slow The Rate Of Channel Opening And Closing Of Glua4 Ampa Receptors, Vincen David Pierce
Stargazin And Gamma-4 Slow The Rate Of Channel Opening And Closing Of Glua4 Ampa Receptors, Vincen David Pierce
Legacy Theses & Dissertations (2009 - 2024)
The ionotropic glutamate receptors are localized in the pre- and postsynaptic membrane of neurons, and they mediate the majority of the fast excitatory synaptic transmission. These receptors are divided into three subtypes: α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA), kainic acid, and N-methyl-D-aspartic acid (NMDA) receptors. AMPA receptor properties are critically dependent on the presence of auxiliary transmembrane proteins, such as transmembrane AMPA receptors regulatory proteins (TARPs). TARPs are the most widespread and well-studied family of auxiliary proteins. For example, the co-assembly of TARPs with AMPA receptors increases the affinity for glutamate, and reduces voltage-dependent blockade by cytoplasmic polyamines in AMPA receptors that lack …
Differentiation Of Potential False Positives From Human Saliva Using Raman Spectroscopy For Forensic Purposes, Selina Casadei
Differentiation Of Potential False Positives From Human Saliva Using Raman Spectroscopy For Forensic Purposes, Selina Casadei
Legacy Theses & Dissertations (2009 - 2024)
Traces of body fluids can be found at a crime scene. Being able to identify and differentiate the body fluids while preserving DNA is fundamentally important for forensic applications. Saliva is an important body fluid that can be found on bite marks, cigarette butts, and more, being an excellent source for DNA extraction. Current tests for saliva and other body fluids are destructive and body fluid specific, and are prone to false positives. Our laboratory has developed a universal method for identification of all main body fluids; saliva, semen, sweat, peripheral blood, and vaginal fluid, using Raman spectroscopy combined with …
Technology Development For Detection Of Circulating Disease Biomarkers From Liquid Biopsies Using Multifunctional Nanomaterials, Mustafa Balcioglu
Technology Development For Detection Of Circulating Disease Biomarkers From Liquid Biopsies Using Multifunctional Nanomaterials, Mustafa Balcioglu
Legacy Theses & Dissertations (2009 - 2024)
Despite the advance health care, devastating health conditions such as cancer and infectious diseases that affect populations worldwide are too often not diagnosed until morbid symptoms become apparent in the late phase. Obtaining an early and accurate diagnosis that reveal a hidden lethal threat before the disease becomes complicated may dramatically reduce the severity of its impact on the patient’s life and increase the probability of survival. For example, in the case of ovarian cancer, which is the fifth most common malignancy and the fifth leading cause of cancer mortality in women in the US, the 5-year relative survival is …
A Consideration Of Ancient Residues And Their Analysis, Jennifer A. Cardinal
A Consideration Of Ancient Residues And Their Analysis, Jennifer A. Cardinal
Legacy Theses & Dissertations (2009 - 2024)
Identification of specific use(s) of ancient pottery vessels through empirical verification is currently very limited for archaeological investigations. Although we can postulate a range of purposes or functions for certain vessels, empirical confirmation of actual use has been determined only for a minuscule portion of the available vessels. This thesis will provide a broad review of organic analyses as applied to foodstuff residues left on ancient artifacts as well as discuss several considerations for such analysis that are unique to their application to archaeological specimens.
Dna Functionalized Nanoparticles In Nanobiosensor And Sensor Array Development For Molecular Diagnostics And In Vitro Identification Of Biomolecules, Mustafa Salih Hizir
Dna Functionalized Nanoparticles In Nanobiosensor And Sensor Array Development For Molecular Diagnostics And In Vitro Identification Of Biomolecules, Mustafa Salih Hizir
Legacy Theses & Dissertations (2009 - 2024)
Nucleic acid technology along with vast variety of nanomaterials has demonstrated a great potential in many applications from biosensing studies to molecular diagnostics, from biomedical and bioanalytical research to environmental analysis. Especially short single stranded (ss) DNA molecules, called oligonucleotides, are extraordinary biopolymers featuring diverse functionality on the nanoparticles thanks to their high degree of programmability, target-specific binding or cleavage, molecular recognition ability, structure-switching capability, and unique interactions at the bio-nano interfaces. Among those, there have been many biosensing applications utilizing ss DNAs and numerous nanomaterials through various detection techniques such as fluorometric, colorimetric or electrochemical methods. Although many groundbreaking …
Field Evaluation Of Portable Air Quality Monitors And Evaluation Of Short-Lived Plume Events Of Atmospheric Pollutants, Joseph Peter Marto
Field Evaluation Of Portable Air Quality Monitors And Evaluation Of Short-Lived Plume Events Of Atmospheric Pollutants, Joseph Peter Marto
Legacy Theses & Dissertations (2009 - 2024)
Availability of low cost optical sensors has allowed for the supplementation of existing air quality infrastructure with portable, adaptive monitors. While these sensors generally cannot offer the same accuracy and precision as established analysis methods, they can still reliably detect changes in pollutant concentration. This study evaluates the performance of two portable air quality enclosures deployed at collocated research sites to determine their accuracy and usefulness in field deployments. One system deployed collocated sensors for measurement of particulate matter mass concentration (Thermo pDR 1500 and TSI DustTrak DRX for PM2.5) and the second system deployed sensors for measurement of black …
Synthesis And Base Pairing Studies Of 5-Cyanomethyl Uridine (Cnm⁵U) And 5-Cyano Uridine (Cn⁵U) In Rna Duplex, Hsu-Chun Tsai
Synthesis And Base Pairing Studies Of 5-Cyanomethyl Uridine (Cnm⁵U) And 5-Cyano Uridine (Cn⁵U) In Rna Duplex, Hsu-Chun Tsai
Legacy Theses & Dissertations (2009 - 2024)
RNA plays an essential role in many biological processes by acting as both genetic information carriers, catalyst and regulator. Natural RNAs usually contain nucleoside analogs from the four common ribonucleosides. There are over 150 chemical modification have been discovered in natural RNA molecules. 5-cyanomethyl uridine is a native modification that has been discovered in total tRNAs from Haloarcula marismortui. This modification in the anticodon wobble position affects the codon recognition, and leads the mutant tRNA to bind not only to AUA but also to AUU and AUG. We synthesized 5-cyanomethyl uridine (cnm5U) and its derivative 5-cyanouridine (cn5U), which has the …
The Detection Of Cocaine In Oral Fluid Using Ultraviolet Resonance Raman Spectroscopy, Yasmine Ahmed
The Detection Of Cocaine In Oral Fluid Using Ultraviolet Resonance Raman Spectroscopy, Yasmine Ahmed
Legacy Theses & Dissertations (2009 - 2024)
Drug abuse has become a worldwide epidemic and is correlated to various serious health problems as well as increased rates of crime; thus, detecting and quantifying cocaine in oral fluid is of significant importance for practical forensics. To date, mainly destructive methods or biochemical tests have been used, while spectroscopic methods were only applied to pretreated samples. In this study, the possibility of using Raman spectroscopy to detect cocaine in oral fluid without pretreatment of samples was investigated. It was found that normal Raman spectroscopy at an excitation wavelength of 407 nm produced no cocaine signal while use of Raman …
Synthesis And Characterization Of Mpims : Metallopolymers Of Intrinsic Microporosity, Kelly Walter
Synthesis And Characterization Of Mpims : Metallopolymers Of Intrinsic Microporosity, Kelly Walter
Legacy Theses & Dissertations (2009 - 2024)
Polymers of intrinsic microporosity (PIMs) are class of polymers known for high surface areas arising from their contorted and rigid backbone structures. While high surface area compounds are applicable in many fields, simultaneous solubility and conductivity in PIMs is still lacking. In general, the monomeric units that form the backbone, necessary to yield inefficient polymer strand packing and contortion, also break conjugation in the along the polymer backbone and therefore limit conductivity. It has been previously noted that extended conjugation and the addition of metal atoms (along the backbone) increases conductivity. We therefore sought to use a strategy whereby the …
A Family Of Cyclooctatetraenyl Lanthanide(Iii) Chloridebridged Dimers : Synthesis, Characterization, And Magnetic Properties, Joshua Sky Greenough
A Family Of Cyclooctatetraenyl Lanthanide(Iii) Chloridebridged Dimers : Synthesis, Characterization, And Magnetic Properties, Joshua Sky Greenough
Legacy Theses & Dissertations (2009 - 2024)
Historically, the 10π-aromatic ligand, cyclooctatetraene (COT), has played a pivotal role
The Development Of Bioaffinity-Based Concepts For On-Site Forensic Analyses : Blood, Sweat, And ... Fingerprints?, Crystal Huynh
The Development Of Bioaffinity-Based Concepts For On-Site Forensic Analyses : Blood, Sweat, And ... Fingerprints?, Crystal Huynh
Legacy Theses & Dissertations (2009 - 2024)
There have been many advances in forensic science over the recent years, but a majority of the tests currently preformed are still heavily reliant upon laboratory-based processes. This means that valuable pieces of information are left unexamined until a crime scene has been completely processed and evidence is moved to a crime lab. In some cases, the evidence may even be left in a queue due to backlogs from previous cases. The delay resulting from the time necessary for crime scene processing and transportation, as well as additional time spent waiting on lab equipment availability, hinders an investigator’s ability to …
Exploring Heterometallic Beta-Diketonates For The Low Temperature Synthesis Of Energy-Related Oxide And Fluoride Materials, Matthew Christopher Barry
Exploring Heterometallic Beta-Diketonates For The Low Temperature Synthesis Of Energy-Related Oxide And Fluoride Materials, Matthew Christopher Barry
Legacy Theses & Dissertations (2009 - 2024)
In order to circumvent the issues associated with traditional ceramic methods such as
Chemically And Biologically Responsive Nanoparticle Systems For Biomarker Detection And Combination Cancer Therapy, Neil M. Robertson
Chemically And Biologically Responsive Nanoparticle Systems For Biomarker Detection And Combination Cancer Therapy, Neil M. Robertson
Legacy Theses & Dissertations (2009 - 2024)
The uniqueness and expression of miRNAs as biomarkers in certain cancers has the potential to radically alter the detection, and therefore the treatment, of the disease. Not only are current detection methods time consuming, and not sensitive enough for biomedical applications, but these small RNAs have yet to be fully utilized in treatment. By utilizing different nanomaterials we aimed to create novel nanodevices for the early, sensitive and specific detection of these biomarkers in a minimally invasive way and develop dual drug releasing nanoparticles, which are entirely controllable, to aid in the treatment of resistant cancer phenotypes.
Carborane Functionalized Cysteine : Synthesis, Structural Characterization, And Biological Evaluation For Boron Neutron Capture Therapy, Tianyu He
Legacy Theses & Dissertations (2009 - 2024)
Carbon-containing boranes, also known as carboranes, have attracted immense interest since their discovery in the 1950’s. Characterization of carboranes revealed their highly symmetrical polyhedral structures, which make them chemically and thermally stable. Their unique chemical properties, hydrophobicity and aromaticity also make them ideal candidates for a variety of applications. Prominent among these are the applications in materials and medicinal chemistry. On the materials chemistry front, carboranes have been investigated as self-assembly building blocks, liquid crystals and gas storage and separation materials. In the medicinal chemistry field, carborane derivatives have been extensively investigated as potential drugs, with a lot of attention …
Genetically Engineered Polypeptides As Biomimetic Light Harvesting Optical Antenna, Jason P. Seeley
Genetically Engineered Polypeptides As Biomimetic Light Harvesting Optical Antenna, Jason P. Seeley
Legacy Theses & Dissertations (2009 - 2024)
Natural resources useful for the generation of energy are limited. The development of efficient materials capable of utilizing the abundant free solar radiation is of considerable interest. Utilization of otherwise wasted energy sources, including solar radiation, is a progressive step in the quest for sustainable energy. Solar radiation incident upon the earth’s surface exceeds current energy requirements and motivates scientists to investigate and develop functional devices and nanomaterials including light harvesting complexes (LHC) capable of capturing solar radiation for energy conversion and storage.
Raman Spectroscopy And Chemometrics For Forensic Bloodstain Analysis : Species Differentiation, Donor Age Estimation, And Dating Of Bloodstains, Kyle C. Doty
Legacy Theses & Dissertations (2009 - 2024)
The field of forensic science is constantly growing, so the advancement of old and unreliable techniques is at the forefront of what will lead to future progress and improvement. Current methods for identification and analysis of bloodstains are underwhelming due to the insignificant amount of information provided in a destructive, unreliable, and unsafe manner. As is the purpose of this research, creating new methodologies that are rapid, nondestructive, robust, statistically reliable, and safe would significantly advance the way bloodstains are currently analyzed, while providing more useful and relevant information for investigations and criminal proceedings. Raman spectroscopy, along with advanced statistical …
Discovering Small Molecule Inhibitors Targeted To Ligand-Stimulated Rage-Diaph1 Signaling Transduction, Jinhong Pan
Discovering Small Molecule Inhibitors Targeted To Ligand-Stimulated Rage-Diaph1 Signaling Transduction, Jinhong Pan
Legacy Theses & Dissertations (2009 - 2024)
The receptor of advanced glycation end product (RAGE) is a multiligand receptor of the immunoglobulin superfamily of cell surface molecules, which plays an important role in immune responses. Full-length RAGE includes three extracellular immunoglobulin domains, a transmembrane domain and an intracellular domain. It is a pattern recognition receptor that can bind diverse ligands. NMR spectroscopy and x-ray crystallization studies of the extracellular domains of RAGE indicate that RAGE ligands bind by distinct charge- and hydrophobicity-dependent mechanisms. It is found that calgranulin binding to the C1C2 domain or AGEs binding to the V domain activates extracellular signaling, which triggers interactions of …
Dna Aptamer-Based Smart Mri Contrast Agent For Dopamine, Angel D. Thompson
Dna Aptamer-Based Smart Mri Contrast Agent For Dopamine, Angel D. Thompson
Legacy Theses & Dissertations (2009 - 2024)
A smart contrast agent is a molecule whose relaxivity changes in response to a biological trigger such as a biomolecule, enzymatic activity, or pH. The focus of my graduate project was to develop a DNA aptamer-based smart MRI contrast agent capable of sensing dopamine. Aptamers are single-stranded oligonucleotides that form stable three-dimensional structures efficient in binding with high affinity and specificity for a range of targets. The DNA aptamer has an attached lanthanide-based probe, consisting of a metal ion Gd(III) and a macrocyclic DOTA ligand. The aptamer was assembled using solid phase oligonucleotide synthesis. Nuclear magnetic resonance was used to …
The Preparation And Characterization Of Tetrafluoro-Lambda~6~-Sulfanes, Linbin Zhong
The Preparation And Characterization Of Tetrafluoro-Lambda~6~-Sulfanes, Linbin Zhong
Legacy Theses & Dissertations (2009 - 2024)
Synthetic access to systematically substituted tetrafluoro-λ6-sulfanes was challenging and the research in this area had been largely abandoned. The original reports of disubstituted-tetrafluoro-λ6-sulfanes were limited to substitution by diphenyl and dialkyl groups. The dialkyl-tetrafluoro-λ6-sulfanes were reactive while the diphenyl substituted compounds showed decreased reactivity. In this dissertation, the systematic substitution on tetrafluoro-λ6-sulfanes has enabled the studies of the substitution effects on reactivity.
Computational Optimization And Characterization Of Molecularly Imprinted Polymers, Jacob Jordan Terracina
Computational Optimization And Characterization Of Molecularly Imprinted Polymers, Jacob Jordan Terracina
Legacy Theses & Dissertations (2009 - 2024)
Molecularly imprinted polymers (MIPs) are a class of materials containing sites capable of selectively binding to the imprinted target molecule. Computational chemistry techniques were used to study the effect of different fabrication parameters (the monomer-to-target ratios, pre-polymerization solvent, temperature, and pH) on the formation of the MIP binding sites. Imprinted binding sites were built in silico for the purposes of better characterizing the receptor – ligand interactions. Chiefly, the sites were characterized with respect to their selectivities and the heterogeneity between sites.
The Technology Development And Commercialization Of 'Smart' Scientific Instrumentations, Tony Hoang
The Technology Development And Commercialization Of 'Smart' Scientific Instrumentations, Tony Hoang
Legacy Theses & Dissertations (2009 - 2024)
The technology development of two centrifuge-based instruments gave rise to an Internet-of-Things (IOT) biotech startup. The first instrument: the centrifuge force microscope (CFM) was recently introduced as a platform for massively parallel single-molecule manipulation and analysis. Here we developed a low-cost and self-contained CFM module that works directly within a commercial centrifuge, greatly improving accessibility and ease of use. Our instrument incorporates research grade video microscopy, a power source, a computer, and wireless transmission capability to simultaneously monitor many individually tethered microspheres. Building off of the first project, the second instrument we introduced was the “smart” centrifuge-test tube holder. The …
Study Of Biologically Important Macromolecules By Nuclear Magnetic Resonance, Christopher Michael Demott
Study Of Biologically Important Macromolecules By Nuclear Magnetic Resonance, Christopher Michael Demott
Legacy Theses & Dissertations (2009 - 2024)
Intrinsically disordered proteins or unstructured segments within proteins play an important role in cellular physiology and pathology. A combination of peptide aptamers selected by using the yeast-two-hybrid scheme, and in-cell NMR identified high affinity binders to a transiently structured intrinsically disordered proteins (IDP). This method was validated using the prokaryotic ubiquitin-like protein, Pup, of the Mycobacterium proteasome. We discover two peptide aptamers that bind to opposite sites of a transient helix in Pup, an intrinsically disordered protein, that have vastly different effects on the survival of Mycobacterium bovis BCG.
Towards A Biomimetic Elastin-Based Nanofiber Scaffold For Salivary Gland Tissue Regeneration And Growth Factor Delivery, Zahraa Ismail Ahmed Foraida
Towards A Biomimetic Elastin-Based Nanofiber Scaffold For Salivary Gland Tissue Regeneration And Growth Factor Delivery, Zahraa Ismail Ahmed Foraida
Legacy Theses & Dissertations (2009 - 2024)
Development of electrospun nanofibers that mimic the structural, mechanical and biochemical properties of natural extracellular matrices (ECMs) and the basement membranes is a promising approach for tissue regeneration. Electrospun fibers of synthetic polymers partially mimic the topography of the ECM, however, their high stiffness, poor hydrophilicity and lack of in vivo-like biochemical cues is not optimal for epithelial cell self-organization and function. In search of a biomimetic scaffold for salivary gland tissue regeneration, we utilized proteins and peptides to induce biomechanical and biochemical cues that resembles the native tissue environment. These functional molecules were introduced to our previously-developed poly lactic-co-glycolic …