Digital Commons Network^™

Use Of Dendrochronology To Promote Understanding Of Environmental Change, Cynthia Stager Mccormick

LSU Doctoral Dissertations

The purpose of this research was to determine how dendrochronology can be used in an experiential unit to enhance high school students’ understanding of environmental change. Dendrochronology, the visual examination of tree ring cross sections provides opportunities to relate environmental change to growth patterns of trees and can be used to show the students both how scientists can investigate the past and how the environment can affect trees. Students engaged in a 10-day unit that employed a variety of constructivist learning activities to investigate environmental change, climate change, and tree growth. The culminating activity was student-created experiments that investigated various …

Comparison Of Middle School Student Performance On Photograph-Based Multiple-Choice Items And Text-Based Multiple-Choice Items On A State Science Achievement Test, Susannah Fowler Craig

LSU Doctoral Dissertations

The purpose of this study was to investigate how photograph-based life science multiple-choice items influenced Louisiana science students' performance on statewide standardized tests, in comparison with text-based items about the same content. This mixed methodology research study focused primarily on types of multiple-choice items, specifically five matched pairs of multiple-choice items, text-only and same-text with a photograph. For the 2007 LEAP field test, statistics from 11 multiple-choice items were utilized to characterize student performance on photograph-based multiple-choice items. Data from all Louisiana 8th grade students taking Form 3 (n=1130) and Form 4 (n=1182) were analyzed to compare student performance on …

Shear Responses Of Poly(Ethylene Oxide)-Laponite Nanocomposite Hydrogels, Elena Loizou

LSU Doctoral Dissertations

This research seeks to understand the structure and shear responses of poly(ethylene oxide)-Laponite nanocomposite hydrogels and to relate the macroscopic physical properties to the nanoscopic structural changes. Understanding that relationship is necessary, in order to tailor material properties to specific applications. Information on the structure at rest on multiple length scales was obtained by combining microscopic and neutron scattering techniques. The structural changes that occur in response to a shear field were explored using rheology and neutron scattering. These structures were examined as a function of polymer molecular weight, polymer and clay concentrations, and sample preparation method. While the sample …

"But Seriously, Folks...": Understanding The Political Effects Of Late Night Television Comedy, Danielle Lynn Sarver

LSU Doctoral Dissertations

The potential political effects of late night comedy programs have been a subject of much debate and concern, particularly since the 2000 Presidential election. Research into this area has been characterized by inconsistency in operationalizations of audiences and an almost exclusive focus on quantitative research. This project was designed to address key concerns that are central to this burgeoning literature by examining “heavy” viewers of late night talk shows (including audiences of Leno, Letterman, and Conan O’Brien) and “heavy” viewers of “The Daily Show with Jon Stewart.” A combination of qualitative and quantitative methodologies were used to understand the relationships …

Releasing Our Technological Imaginations: A Translation Of Maxine Greene's Aesthetic Educational Theory Into The Language Of Instructional Technology, Mara Linaberger

Electronic Theses and Dissertations

This qualitative study is a journey--an attempt to translate personal experience and theory into a practical philosophical guide for teachers who desire to utilize the rich palette of technology in broad, meaningful ways. It begins with a reflection upon the impact that aesthetic educational theory has had on my teaching practices with technology. The project then moves on to identify and define the philosophical and theoretical underpinnings of both Instructional Technology and aesthetic education, seeking to locate common elements which will assist in merging the two disciplines. Through examining the demands of various qualitative methods to the purpose of this …

The Impact Of Organizational Culture, Feminist Theory And Leadership Of The First Seven Presidents On The Historical Development Of Mercyhurst College (1926-1972), Mary Lee Lynch

Electronic Theses and Dissertations

The religious heritage and ideals of many American Catholic colleges and universities are associated with the orders of women religious that established women's colleges in the 19th century and served them through the 20th century. The social histories of their individual colleges are just beginning to be written. This study provides historical information on the first seven Sister of Mercy presidents of Mercyhurst College in Erie, Pennsylvania. It searches out the role each of these presidents played not just in maintaining the culture of the institution but also in making significant adaptations to it. The study focuses on female centered …

Tourmalinities In Neoproterzoic Metaevaporitic Deposit Of Duruchas Formation, Damar Belt, Central Namibia, Haiting Sun

LSU Doctoral Dissertations

Tourmalinites from a well-developed meta-evaporite sequence in the Neoproterozoic Duruchaus Formation of central Namibia contain tourmalines with chemical and textural features that are excellent recorders of their environment of formation. Unlike most other meta-evaporitic deposits, this tourmalinite locality exhibits only minor deformation. The tourmalinites form as finely laminated units ca. 1 m thick within a sequence of quartzites, mica schists, dolomitic marbles, and carbonate breccias. Well-preserved pseudomorphs are considered to replace a variety of evaporitic minerals. The meta-sedimentary rocks of the Duruchaus Formation have been interpreted as representing lacustrine, playa lake, fluvial, and non-marine evaporite deposition in an intracontinental rift …

Structural Manipulation Of Pyrrole-Terminated Dendrimers To Create A More Efficient Encapsulation/Release System, Henry Wiggins

LSU Doctoral Dissertations

This work demonstrates the ability to manipulate the structure of pyrrole-terminated dendrimers by modifying solution conditions which directly affects their encapsulation properties. Investigations were conducted using FTIR and 2D NMR to determine the location of end groups. NMR relaxation studies were conducted at various temperatures and different solution pH to gain an understanding of the relative mobility and rigidity of different areas of the dendrimer. It was found that that the release properties were affected by the solution pH and the presence of salt. Further the effectiveness of retaining molecular guests by oligo-pyrrole terminated dendrimers with a range of oligomer …

The Symbolism Of Tennessee Williams' The Glass Menagerie: An Inductive Approach, D. Brent Barnard

LSU Doctoral Dissertations

Tennessee Williams expressed himself in the language of symbols. They were not ornaments to his work, but were to his mind the only satisfactory means of expressing himself as an artist, and predate almost every other consideration in the process of composition. Characterization, dialogue, plot and setting were all selected based on their potential to represent symbolically his identity and experience, and more specifically, the conflict between spirit and flesh which he felt had come to define him. However, before transforming his life into symbols, he attempted to abstract the world of his experience into something pure, something elemental and …

Mechanistic Modeling Of An Underbalanced Drilling Operation Utilizing Supercritical Carbon Dioxide, Faisal Abdullah Aladwani

LSU Doctoral Dissertations

Mechanistic modeling of an underbalanced drilling operation using carbon dioxide has been developed in this research. The use of carbon dioxide in an underbalanced drilling operation eliminates some of the operational difficulties that arises with gaseous drilling fluids, such as generating enough torque to run a downhole motor. The unique properties of CO₂, both inside the drill pipe and in the annulus are shown in terms of optimizing the drilling operation by achieving a low bottomhole pressure window. Typically CO₂ becomes supercritical inside the drill pipe at this high density; it will generate enough torque to run …

Smoke And Mirrors: A Cultural-Psychological Analysis Of Tobacco Use, Michael Melczak

Electronic Theses and Dissertations

This theoretical dissertation explores tobacco use from the perspectives of social constructivism and phenomenological depth psychology. In Part I, tobacco use is described as a cultural artifact, and transformations in tobacco use are traced through three different cultural contexts or "worlds": the indigenous or aboriginal worldview, the European and American worldview of the 17th through mid-19th centuries, and the modern American worldview (or "modernity"). In each of these worldviews, the cultural context informed and influenced (or reflected and reproduced) understandings of tobacco use. One notices the transformation of tobacco use, for example, from a god to a commodity and from …

Simulations-Guided Design Of Process Analytical Sensor Using Molecular Factor Computing, Bin Dai

University of Kentucky Doctoral Dissertations

Many areas of science now generate huge volumes of data that present visualization, modeling, and interpretation challenges. Methods for effectively representing the original data in a reduced coordinate space are therefore receiving much attention. The purpose of this research is to test the hypothesis that molecular computing of vectors for transformation matrices enables spectra to be represented in any arbitrary coordinate system. New coordinate systems are selected to reduce the dimensionality of the spectral hyperspace and simplify the mechanical/electrical/computational construction of a spectrometer. A novel integrated sensing and processing system, termed Molecular Factor Computing (MFC) based near infrared (NIR) spectrometer, …

Sorbitol Dehydrogenase Expression In Apple Fruit, Marta Nosarzewski

University of Kentucky Doctoral Dissertations

Sorbitol, the primary photosynthate and translocated carbohydrate in apple (Malus x domestica Borkh.), is converted to fructose by SORBITOL DEHYDROGENASE (SDH; EC 1.1.1.14) which is active in apple fruit throughout fruit development. Apple fruit set and early development is very sensitive to carbohydrate availability, but details on carbohydrate metabolism during this phase are limited. The first objective of this work was to determine if SORBITOL DEHYDROGENASE, the primary enzyme responsible for metabolism of the major phloem-transported carbohydrate sorbitol, is present and active during apple fruit set and early development. The second objective of this work was to determine if SDH …

Chiral 1, 2-Diamino Guests In Chain Replacement Peptidomimetics: A New Helical Motif, Marlon D. Jones

University of Kentucky Doctoral Dissertations

Peptides are short, sequence and length specific oligomers composed of small amino acid residues. Nature has refined these peptide sequences and their endogenous function through evolution. In addition, peptides have played an important role in medicine, which has lead to further research into developing peptides as lead pharmaceuticals (therapeutic peptides). Unfortunately, therapeutic peptides are inferior as drug candidates due to their low oral bioavailability; immunogenicity and potential to be attacked by peptidases. Fortunately, peptides can be modified by steric constraints, cyclization, and/or replacement of the peptide backbone itself creating a mimic (peptidomimetic) of the original peptide. Peptidomimetics are deliberately designed …

Design Aids For Air Vessels For Transient Protection Of Large Pipe Networks - A Framework Based On Parameterization Of Knowledge-Base Derived From Optimized Network Models, Dhandayudhapani Ramalingam

University of Kentucky Doctoral Dissertations

The need for optimal air vessel sizing tools, in protecting large pipe networks from undue transient pressures is well known. Graphical and other heuristic methods reported in literature are limited to sizing the air vessels for simple rising mains. Although attempts have been made to utilize optimization techniques, they have been largely unsuccessful due to their impractical computational requirements. This research work proposes a robust framework for developing surge protection design tools and demonstrates the usefulness of the framework through an example air vessel sizing tool. Efficiency and robustness of the proposed framework are demonstrated by developing a design aid …

Viscoelastic Relaxation Characteristics Of Rubbery Polymer Networks And Engineering Polyesters, Sumod Kalakkunnath

University of Kentucky Doctoral Dissertations

The relaxation characteristics of rubbery poly(ethylene oxide) [PEO] networks have been investigated as a function of network composition and architecture via dynamic mechanical analysis and broadband dielectric spectroscopy. A series of model networks were prepared via UV photopolymerization using poly(ethylene glycol) diacrylate [PEGDA] as crosslinker: variations in crosslink density were achieved either by the introduction of water in the prepolymerization reaction mixture, or by the inclusion of mono-functional acrylate such as poly(ethylene glycol) methyl ether acrylate [PEGMEA] or poly(ethylene glycol) acrylate [PEGA]. Copolymerization with mono-functional acrylate led to the insertion of flexible branches along the network backbone, and the corresponding …

Hebi Sani: Mental Well Being Among The Working Class Afro-Surinamese In Paramaribo, Suriname, Aminata Cairo

University of Kentucky Doctoral Dissertations

This dissertation describes the results of a two year anthropological investigation into the concept of mental well being among the working class Afro-Surinamese population in Paramaribo, Suriname. More specifically, the research investigated how working class Afro-Surinamese in Paramaribo, Suriname define and maintain their sense of mental well-being, given their unique ethnic identity within a multi-ethnic and multicultural society, and given that their environment is heavily compromised by negative globalizing forces Over the course of two years a total of 62 people contributed information through group and individual interviews, which was supplemented by information obtained through participant observation. Findings show a …

Nitroreductase: Evidence For A Fluxional Low-Temperature State And Its Possible Role In Enzyme Activity, Peng Zhang

University of Kentucky Doctoral Dissertations

The enzyme nitroreductase (NR) catalyzes two-electron reduction of high explosives such as trinitrotoluene (TNT), a wide variety of other toxic nitroaromatic compounds, as well as riboflavin derivatives, using a tightly-bound flavin mononucleotide (FMN) cofactor. It has important environmental and clinical implications. Previous studies have focused on elucidating NRs catalytic mechanism and solving its crystal structure.

In this dissertation work, we first develop and implement new strategies for labeling NR with stable isotopes, and report a completely re-designed protocol for NRs purification. Then we report the successful assignment of over half of NRs backbone resonances using 3d-NMR methods. The most significant …

New Developments In Cyclized Arsenic And Antimony Thiolates, Taimur A. Shaikh

University of Kentucky Doctoral Dissertations

There is a continued interest in the properties of arsenic thiolate compounds for both industrial and biological uses. Recent discoveries in the medicinal properties of such compounds have resulted in a sustained need for the synthesis of new dithiarsolane compounds for research as anti-leukemic compounds. Close analogues of the 2-halo arsenic dithiolates, namely those with an arsenic-carbon bond instead of an arsenic-halide bond, have recently been shown to have some efficacy towards leukemia cells. Based on the hydrolytic character and the active role of glutathione with arsenic in vivo, the compounds reported here may also have such activity. Arsenic compounds …

Targeting Axon Growth From Neurons Transplantedinto The Central Nervous System, Kristine S. Ziemba

University of Kentucky Doctoral Dissertations

Damage to the adult mammalian central nervous system (CNS), either by traumatic injury or disease, usually results in permanent sensory and/or motor deficits. Regeneration of neural circuits is limited both by the lack of growthpromoting molecules and by the presence of growth-inhibitory molecules in the mature brain and spinal cord. The research described here examines the therapeutic potential of viral vectors and neuronal transplants to reconstruct damaged neural pathways in the CNS. Experimental neural transplantation techniques often fall short of expectations because of limited transplant survival and insufficient neurite outgrowth to repair connections and induce behavioral recovery. These shortcomings are …

Instructional Communication Matters: A Test Of Knowledge Acqusition Theory (Kat) From A Message-Oriented Receiver Perspective, Robert Joseph Trader

University of Kentucky Doctoral Dissertations

This dissertation encourages adoption of a message-oriented receiver perspective when developing new instructional communication theories and proposes a causal-process model derived from Knowledge Acquisition Theory to demonstrate how this perspective can be used to predict student cognitive learning outcomes. Three hypotheses are generated to test the propositions of the derived model. The first hypothesis seeks to determine which dimensions of instructional message clarity and course content relevance best predict student interactions with instructional content. The second hypothesis predicts that student self-reported knowledge gains are a function of student interactions with content. The third hypothesis predicts that a significant proportion of …

Ripening And Postharvest Management Of Pawpaw Fruit, Federica Galli

University of Kentucky Doctoral Dissertations

Pawpaw (Asimina triloba (L.) Dunal) has significant potential as a new fruit crop. During ripening, loss of firmness is extremely rapid, and this trait may be the biggest obstacle to the development of a broader market as handling without injury is difficult. Cold storage of pawpaw seems limited to 4 weeks at 4 C. A study of several cultivars with commercial appeal showed that ripening traits such as ethylene production, respiration and loss of firmness were similar in all genotypes, and that no cultivar showed superior responses to cold storage. Cold storage for longer than 4 weeks caused the development …

Prevention Of Hormonal Mammary Carcinogenesis In Rats By Dietary Berries And Ellagic Acid, Harini Sankaran Aiyer

University of Kentucky Doctoral Dissertations

Breast cancer is the most frequently diagnosed cancer among women around the world. The hormone 17-estradiol (E2) is strongly implicated as a causative agent in this cancer. Since estrogen acts as a complete carcinogen, agents that interfere with the carcinogenic actions of E2 are required. Most agents effective against experimental mammary carcinogenesis have been employed as pure compounds disregarding the synergy that exists between several phytonutrients in a whole food. In these studies we have taken a unified approach, by employing a pure phytonutrient ellagic acid and whole foods that contain the phytonutrient at various levels berries, in the prevention …

Computer Simulation And Modeling Of Physical And Biological Processes Using Partial Differential Equations, Wensheng Shen

University of Kentucky Doctoral Dissertations

Scientific research in areas of physics, chemistry, and biology traditionally depends purely on experimental and theoretical methods. Recently numerical simulation is emerging as the third way of science discovery beyond the experimental and theoretical approaches. This work describes some general procedures in numerical computation, and presents several applications of numerical modeling in bioheat transfer and biomechanics, jet diffusion flame, and bio-molecular interactions of proteins in blood circulation.

A three-dimensional (3D) multilayer model based on the skin physical structure is developed to investigate the transient thermal response of human skin subject to external heating. The temperature distribution of the skin is …

Virtual' Brides In The Post-Soviet Context, Michael Paul Begin

University of Kentucky Doctoral Dissertations

This project offers a multifaceted, interdisciplinary approach to understanding the contemporary post-Soviet Internet bride phenomenon and the rationales, motives, and aspirations of the industry's participants. As international marriage services have incorporated information and communications technologies (ICTs) to assist in the marketing of women of post-communist nations for correspondence courtship with Western men, the industry has furthered the globalization of marriage markets and the opportunities for communicative exchange among disparate nations and cultures. By way of case study, the project takes a special focus on the Belarusian/American segment of the industry, turning to personal interviews with participants and employing qualitative techniques …

Diversity In A Japanese Transplant: The Effect Of Gender, Race, Age, And Employment Status On Teamwork, Elena Darina Lepadatu

University of Kentucky Doctoral Dissertations

Diversity and Teamwork are currently some of the trendiest human resources strategies of boosting team performance and ultimately, organizational performance. This study analyzes the impact of gender, racial, age and employment status diversity on teamwork, and is one of the first studies on diversity and teamwork in the mature phase of Japanese transplants. The theoretical framework includes elements of the symbolic interactionist theory, Kanter.s theory on tokenism, revised contact hypothesis and perspectives on cultural diversity (Ely and Thomas, 2001). The data were collected from interviews with 87 workers from 16 production teams working on the assembly line at a top …

Investigation Of The Assembly Of Surfactants At The Solid-Liqid Interface For Adsorption And Materials Applications, Rong Xing

University of Kentucky Doctoral Dissertations

This dissertation addresses two topics associated with the assembly of surfactants at the solid-liquid interface for adsorption and materials synthesis. The first is the adsorption of an anionic fluorinated surfactant, tetraethylammonium perfluorooctylsulfonate (TEA-FOS), at the solid/liquid interface. Attenuated total reflection Fourier transform infrared spectroscopy is used to study the adsorption kinetics and average orientation of surfactants at the hydroxylated germanium surface. Atomic force microscopy provides complementary images of the adsorbed layer structure on mica. The adsorption follows unusual three-stage kinetics in which the rate of adsorption starts fast, slows as the surface becomes crowded, and then (surprisingly) accelerates due to …

Religiousness And Alcohol Use: Exploring The Role Of Descriptive Drinking Norms, Emily H. Brechting

University of Kentucky Doctoral Dissertations

Alcohol use in young adults requires continued attention due to the significant number of problems related to alcohol consumption. The alcohol use literature has explored a variety of constructs related to alcohol use in young adults including religiousness. The aims of the current study were to demonstrate the relationships between religiousness and alcohol use, explore the associations between religiousness and descriptive drinking norms, replicate the relationships between drinking norms and alcohol outcomes, and explore the mediating role of descriptive drinking norms on the relationships between religiousness and alcohol outcomes. Three hundred and thirtythree undergraduate students (M=19.72 years old; SD=1.1) completed …

Mapping Hiv Prevention In Poland: Contested Citizenship And The Struggles For Health After Socialism, Jill Teresa Owczarzak

University of Kentucky Doctoral Dissertations

This ethnographic dissertation research project examines HIV prevention programs in Warsaw, Poland to explore the concurrent processes of democratization and privatization as Poland begins European Union accession. As inherently political public health interventions, HIV prevention programs provoke discussions of risk and responsibility, and visions of the moral social order. Therefore, they can be used to understand the ways in which politically and socially marginalized populations invoke claims to citizenship status through attention to health issues. From an epidemiological perspective, HIV/AIDS arrived in Poland relatively late (1985) and never reached the anticipated epidemic levels. In the 1980s, drawing attention to the …

The Design And Synthesis Of Novel Chelates For The Precipitation Of Mercury, Aaron Robert Hutchison

University of Kentucky Doctoral Dissertations

Mercury has been an element of great industrial importance since early times.This wide utilization of the element has led to pervasive mercury contamination in theglobal environment. Due to mercury's high toxicity, this is a matter of great concern. Anumber of methods, includ ing phytoremediation, filtration, and precipitation/chelation,have been investigated to remove mercury from the environment. Unfortunately, thesemethods are not entirely satisfactory for the in-situ remediation of mercury from aqueousenvironments.The hypothesis of this dissertation is that this can best be accomplished by theaddition of a large and flexible sulfur-based chelate, that will bind mercury in atetracoordinate and presumably tetrahedral environment, to …