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Articles 1081 - 1110 of 1428
Full-Text Articles in Chemistry
Chemistry 106 Chemistry For Health Professions Fall 2015, Sheryl Drake
Chemistry 106 Chemistry For Health Professions Fall 2015, Sheryl Drake
Chemistry Courses
No abstract provided.
The Role Of Hydroxyl Channel In Defining Selected Physicochemical Peculiarities Exhibited By Hydroxyapatite, Vuk Uskoković
The Role Of Hydroxyl Channel In Defining Selected Physicochemical Peculiarities Exhibited By Hydroxyapatite, Vuk Uskoković
Pharmacy Faculty Articles and Research
Mysteries surrounding the most important mineral for the vertebrate biology, hydroxyapatite, are many. Perhaps the Greek root of its name, απαταo, meaning ‘to deceive’ and given to its mineral form by the early gem collectors who confused it with more precious stones, is still applicable today, though in a different connotation, descriptive of a number of physicochemical peculiarities exhibited by it. Comparable to water as the epitome of peculiarities in the realm of liquids, hydroxyapatite can serve as a paradigm for peculiarities in the world of solids. Ten of the peculiar properties of hydroxyapatite are sketched in this review piece, …
Development Of Platinum-Based Catalysts On Polyimide Films For Alcohol Electro-Oxidation, Rungnahpa Ruangsariyanon
Development Of Platinum-Based Catalysts On Polyimide Films For Alcohol Electro-Oxidation, Rungnahpa Ruangsariyanon
Chulalongkorn University Theses and Dissertations (Chula ETD)
This research studied the preparation of highly dispersed platinum nanoparticles on polyimide films or Pt/PI by surface modification method. Firstly, polyimide film was hydrolyzed in basic solution, followed by being immersed in platinum-ion solution to allow ion exchange process. Platinum ions on the film were subsequently reduced using proper reducing agent to give Pt/PI. After that, morphological and other information of the Pt/PI was investigated by X-ray diffraction analysis, scanning electron microscopy-energy dispersive X-ray spectroscopy, transmission electron microscopy, and inductively coupled plasma-optical emission spectroscopy. Electrochemical performance of the Pt/PI for the electro-oxidation of alcohols was investigated by means of cyclic …
Triphenylamine-, Porphyrin- And Fullerene-Based Derivatives For Photovoltaic And Other Applications, Danisha Marie Rivera Nazario
Triphenylamine-, Porphyrin- And Fullerene-Based Derivatives For Photovoltaic And Other Applications, Danisha Marie Rivera Nazario
Open Access Theses & Dissertations
Proper collection of charges at the electrodes is an important process in organic solar cells. Interfacial layers between the electrodes and the photoactive layer have been design to improve charge collection and ohmic contacts. The most studied interfacial layer between the anode and the photoactive layer is the negatively charged polymer poly(3,4-ethylendioxythiophene):poly(styrenesulfonate) (PEDOT:PSS), that possesses good hole transporting ability. However, inhomogeneities at the surface of the electrode after deposition of the polymer lower the stability and performance of the OPV devices. Triphenylamine (TPA) derivatives have received increased attention in the organic solar cells (OSCs) field because of their favorable light …
Characterization Of Kendex® 0834 (Heavy Resins) & Kendex® 0897 (Light Resins), Victor Correa
Characterization Of Kendex® 0834 (Heavy Resins) & Kendex® 0897 (Light Resins), Victor Correa
Open Access Theses & Dissertations
Characterization of crude oil and some of its refined products has always been a challenge in the refining industry. This is mainly due to the high molecular complexity of crude oil. In this research, Heavy and Light Resins extracted from Penn Grade crude oil were analyzed with a wide variety of techniques, ranging from X-Ray Diffraction, Electron Microscopy, Fourier Transformed Infrared, C-13 Nuclear Magnetic Resonance, and chromatographic methods. An asphaltene extraction protocol was performed on both products. Only the Heavy Resin sample yielded a low amount of asphaltene. Results show that both Resins have a high degree of carbon branching, …
Role Of Small Molecules In Rescuing Protein Folding Under Oxidative Stress, Mahmoud Fawzi Megahed Helal Khalil
Role Of Small Molecules In Rescuing Protein Folding Under Oxidative Stress, Mahmoud Fawzi Megahed Helal Khalil
Open Access Theses & Dissertations
Increased levels of nitrosative stress intracellularly within the endoplasmic reticulum is a key factor involvled in the pathogenesis of both Parkinson's (PD) and Alzheimer's (AD) diseases. Previous in-vitro studies in our lab showed that increased levels of nitrosative stress lead to aggregation of misfolded proteins and formation of Lewy Bodies, the main biomarker of PD and AD diseases. Although this was mainly through nitrosylation of Protein Disulfide Isomerase (PDI), the chief endoplasmic reticulum (ER) resident oxidoreductase chaperone responsible for maturation of disulfide-bond-containing proteins, we demonstrate in this project that increased levels of nitrosative stress has an additional direct effect on …
Nanoceria Exposure To Kidney Beans (Phaseolus Vulgaris): Implications On Plant Physiology, Nutrition And Their Transfer To Next Trophic Level, Sanghamitra Majumdar
Nanoceria Exposure To Kidney Beans (Phaseolus Vulgaris): Implications On Plant Physiology, Nutrition And Their Transfer To Next Trophic Level, Sanghamitra Majumdar
Open Access Theses & Dissertations
Previous studies investigating the effects of cerium oxide nanoparticles (nanoceria, nCeO2) on plants have primarily focused on the physiological and biochemical changes at early growth stages. Comprehensive information on the effects of nCeO2 through the entire life cycle of plants and the nutritional quality of the edible tissues is limited. No studies have been reported on the interactions between nCeO2 and common beans (Phaseolus vulgaris). Common beans are leguminous crops, which are societally important due to their nutritional benefits. The beans are rich in proteins and essential nutrients like folate, iron, zinc, molybdenum and magnesium, and are consumed worldwide. This …
Porous Layers Composed Of Oxide Crystallites Formed By The Combination Of Laser Ablation And Anodization Of Metal, Abbie S. Ganas, Dmitry A. Znamensky, Nahúm Méndez Alba, José Luis Hernández-Pozos, Kurt W. Kolasinski
Porous Layers Composed Of Oxide Crystallites Formed By The Combination Of Laser Ablation And Anodization Of Metal, Abbie S. Ganas, Dmitry A. Znamensky, Nahúm Méndez Alba, José Luis Hernández-Pozos, Kurt W. Kolasinski
Chemistry Faculty Publications
No abstract provided.
Optimization Of Molecular Beacon-Based Multicomponent Probes For Analysis Of Nucleic Acids, Maria Stancescu
Optimization Of Molecular Beacon-Based Multicomponent Probes For Analysis Of Nucleic Acids, Maria Stancescu
Electronic Theses and Dissertations
Detection of single nucleotide substitutions (SNS) in DNA and RNA has a growing importance in biology and medicine. One traditional approach for recognition of SNS takes advantage of hybridization probes that bind target nucleic acids followed by measuring ?Tm, the difference in melting temperatures of matched and mismatched hybrids. The approach enables SNS differentiation at elevated temperatures (usually 40-65oC) often only in a narrow range of < 10oC and requires high-resolution melting devices. Here we demonstrate that a specially designed DNA probe (X sensor) can broaden ?Tm from ~10oC to ~16oC and distinguish SNS in the interval of ~5-40oC. Therefore, there is no need for heating or measuring Tm for accurate SNS differentiation. Our data indicate that this wide differentiation range is in part due to the non-equilibrium hybridization conditions. Further we explored the idea that it is possible to improve the performance of an X sensor operable in close to equilibrium conditions by shifting its operability to non-equilibrium conditions. One way to achieve this is to introduce as many as possible structured ligands in analyte's dissociated state. Here we show that by introducing the maximum possible conformational constraints in X probe it is possible to shift its operation to non-equilibrium conditions and to improve its selectivity at temperatures < 15oC. Thus, this work points towards a new strategy for the design of highly selective hybridization sensors which operate in non-equilibrium conditions at close to room temperature. The X sensors could be utilized in qPCR, microarrays, as well as RNA analysis in living cells and for ambient temperature point-of-care diagnostics. In the last part of this work, X sensors were used in real time detection of PCR products. The sensors were optimized to operate in PCR buffer with optimal Mg2+ concentration. They were able to detect the target amplicon together with nonspecific products. The results presented here suggest that X sensors might be adopted for real time PCR format.
Strategies For Enhanced Genetic Analysis Of Trace Dna From Touch Dna Evidence And Household Dust, Katherine Farash
Strategies For Enhanced Genetic Analysis Of Trace Dna From Touch Dna Evidence And Household Dust, Katherine Farash
Electronic Theses and Dissertations
In forensic casework it is often necessary to obtain genetic profiles from crime scene samples that contain increasingly smaller amounts of genetic material, called Low Template DNA (LTDNA). Two examples of LTDNA sources are touch DNA evidence and dust bunnies. Touch DNA refers to DNA that is left behind through casual contact of a donor with an object or another person. Touch DNA can be used to prove a suspect was present at a crime scene. Dust bunnies, or dust conglomerates, typically contain trapped shed skin cells of anyone in the vicinity along with fibers, dirt, hair, and other trace …
Photophysics Of Organic Probes And Their Applications In Bioimaging & Photodynamic Therapy, Bosung Kim
Photophysics Of Organic Probes And Their Applications In Bioimaging & Photodynamic Therapy, Bosung Kim
Electronic Theses and Dissertations
Over the past several decades the phenomenon of luminescence (divided into fluorescence and phosphorescence) has received great attention in the field of biological science. This quest has motivated scientists for a variety of applications, including fluorescence imaging. Fluorescence microscopy techniques that provide unique advantages, such as high spatial resolution and superior sensitivity, have been regarded as attractive tools in biophotonics. With the progress of ultrafast laser sources, two-photon absorption (2PA), in which a molecule absorbs two photons simultaneously, has opened possibilities of using it for various applications. Two-photon fluorescence microscopy (2PFM), which affords deeper tissue penetration and excellent three-dimensional (3D) …
Structure-Property Relationship Of The Two-Photon Circular Dichroism Of Compounds With Axial And Helical Chirality, Carlos Diaz
Structure-Property Relationship Of The Two-Photon Circular Dichroism Of Compounds With Axial And Helical Chirality, Carlos Diaz
Electronic Theses and Dissertations
Back in 1894 Lord Kelvin coined the term "chiral" in order to refer to molecules whose mirror images were not superimposable with themselves. Over the years, research has demonstrated the important role that chiral molecules play in life, chemistry, and biology as well as their importance in the development of new drugs and technologies. The efforts to understand chiral systems have been mainly driven by spectroscopic methods that leverage on the opposite responses that enantiomers have to linear or circularly polarized light of both handedness. More specifically, Electronic Circular Dichroism (ECD) which measures the differences in linear absorption of left …
Crystal Structure Of {2,20-[N,N0-Bis(Pyridin-2-Yl-Methyl)Cyclohexane-Trans-1,2-Diyldi(Nitrilo)]- Diacetato}Cobalt(Iii) Hexafluoridophosphate, Craig C. Mclauchlan, Daniel S. Kissel, Albert W. Herlinger
Crystal Structure Of {2,20-[N,N0-Bis(Pyridin-2-Yl-Methyl)Cyclohexane-Trans-1,2-Diyldi(Nitrilo)]- Diacetato}Cobalt(Iii) Hexafluoridophosphate, Craig C. Mclauchlan, Daniel S. Kissel, Albert W. Herlinger
Faculty Publications – Chemistry
The title compound [Co(C22H26N4O4)]PF6, commonly known as [Co(bpcd)]PF6, where bpcd2- is derived from the historical ligand name N,N'-bis(2-pyridylmethyl)-trans-1,2-diaminocyclohexane-N,N'-diacetate, crystallized by slow evaporation of a saturated acetonitrile solution in air. The cation of the hexafluoridophosphate salt has the CoIII atom in a distorted octahedral coordination geometry provided by an N4O2 donor atom set. The acetate groups, which are oriented trans with respect to each other, exhibit monodentate coordination whereas the pyridyl N atoms are coordinating in a cis configuration. The geometry of the cation is compared to the geometries of other diamino …
Using Technology To Engage Students In The Stem Field, April Elizabeth Steen
Using Technology To Engage Students In The Stem Field, April Elizabeth Steen
Honors Theses
The United States is currently facing a shortage of qualified STEM professionals in the workforce and in research fields. Part of this lack of professionals can be traced back to lack of interest and lack of proficiency in mathematics and science at the secondary level of education as well as STEM major attrition at the college level. In an effort to increase student interest in STEM fields and increase retention of STEM majors, technology was employed to engage student interest. At the high school level, a physical chemistry demonstration on the spectroscopy of light was created. The demonstration was presented …
Towards The Synthesis Of A Swallowtailed Perylene Monoimide, Wyatt S. Whicker
Towards The Synthesis Of A Swallowtailed Perylene Monoimide, Wyatt S. Whicker
Honors Theses
This project was initiated in conjunction with Dr. Justin Youngblood from the University of North Texas. The goal was to synthesize a molecule to be used in solar cell testing. The target molecule involved combining donor and acceptor groups to make a combination that would be able to transfer electricity in a unilateral direction to increase efficiency in solar cells. My project involved the donor portion, a perylene monoimide donor with a long alkyl swallowtail to impart solubility. While the final molecule was not synthesized, the proposed procedure for making such a molecule was improved upon. A perylene tetracarboxylic dianhydride …
The Effects Of Hg2+ On Secondary Structures Formed By T-Rich Dna, Zachary Boynton
The Effects Of Hg2+ On Secondary Structures Formed By T-Rich Dna, Zachary Boynton
Honors Theses
Single stranded DNA that forms secondary structures has been a popular area of research in recent years. Much research has also been done in the field of heavy metals binding to DNA. Recently, it has been discovered that mercury in the presence of thymines will form T-HgII-T bonds. It is our hypothesis that single stranded DNA rich in thymine residues will form into a structure similar to i-motifs, formed from C-rich single strands, in the presence of mercury. Based on spectral changes during a mercuric titration, it is evident that mercury induces a structural change in T-rich DNA. We then …
An Investigation Of Protein-Dna Binding Characteristics By Fluorescence Anisotropy, Danna Nobile
An Investigation Of Protein-Dna Binding Characteristics By Fluorescence Anisotropy, Danna Nobile
Honors Theses
Recent studies have illustrated the presence of several secondary, non-B DNA structures that are associated with the promoter regions of several oncogenes, such as the intensely studied MYC gene. Two such secondary structures, G-quadruplexes and i-Motifs, have become topics of interest due to their prevalence within oncogenic promoters and their potential accessibility for future drug targeting due to their globular natures. Though fairly extensive research has been conducted to understand different factors affecting G-quadruplex formation and stability, similar studies for i-Motifs, particularly related to thermodynamics, are still evolving. One factor known to contribute to the additional energy required for duplex …
Chemistry 106 Chemistry For Health Professions Spring 2016, Kristy Jeans
Chemistry 106 Chemistry For Health Professions Spring 2016, Kristy Jeans
Chemistry Courses
No abstract provided.
Chemistry 100-001 Introduction To Chemistry Fall 2015, Kim Bode
Chemistry 100-001 Introduction To Chemistry Fall 2015, Kim Bode
Chemistry Courses
No abstract provided.
Chemistry 102-001 General Chemistry Ii Fall 2015, C. Britt Carlson
Chemistry 102-001 General Chemistry Ii Fall 2015, C. Britt Carlson
Chemistry Courses
No abstract provided.
Chemistry 101-004 General Chemistry I Fall 2015, Amy Nicely
Chemistry 101-004 General Chemistry I Fall 2015, Amy Nicely
Chemistry Courses
No abstract provided.
Chemistry 102-002 General Chemistry Ii Spring 2015, Manuel I. Rodriguez
Chemistry 102-002 General Chemistry Ii Spring 2015, Manuel I. Rodriguez
Chemistry Courses
No abstract provided.
Chemistry 203 Organic Chemistry I Spring 2015, Laura B. Sonnichsen
Chemistry 203 Organic Chemistry I Spring 2015, Laura B. Sonnichsen
Chemistry Courses
No abstract provided.
Chemistry 106 Chemistry For Health Professions Spring 2017, Amy Nicely
Chemistry 106 Chemistry For Health Professions Spring 2017, Amy Nicely
Chemistry Courses
No abstract provided.
Chemistry 104 The Chemistry Of Everyday Life Online Spring 2015, Manuel I. Rodriguez
Chemistry 104 The Chemistry Of Everyday Life Online Spring 2015, Manuel I. Rodriguez
Chemistry Courses
No abstract provided.
Chemistry 104 The Chemistry Of Everyday Life Online Summer 2015, Manuel I. Rodriguez
Chemistry 104 The Chemistry Of Everyday Life Online Summer 2015, Manuel I. Rodriguez
Chemistry Courses
No abstract provided.
Chemistry 100-251 W Introduction To Chemistry Online Summer 2015, Kristy Jeans
Chemistry 100-251 W Introduction To Chemistry Online Summer 2015, Kristy Jeans
Chemistry Courses
No abstract provided.
Chemistry 106 Chemistry For Health Professions Fall 2015, Kim Bode
Chemistry 106 Chemistry For Health Professions Fall 2015, Kim Bode
Chemistry Courses
No abstract provided.
Chemistry 101-001 General Chemistry I Fall 2015, Steven L. Mullen
Chemistry 101-001 General Chemistry I Fall 2015, Steven L. Mullen
Chemistry Courses
No abstract provided.
Chemistry 101-005 General Chemistry Fall 2015, Christina Beatty
Chemistry 101-005 General Chemistry Fall 2015, Christina Beatty
Chemistry Courses
No abstract provided.