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22
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21
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17
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16
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Academic Reading Online: Digital Reading Strategies of Graduate-level English Language Learners
English language learners (ELLs) face many linguistic and cultural challenges in their attempts to succeed academically. They encounter complex academic text, which is increasingly presented online. Although some research has addressed the challenges that university-level ELLs face when reading online texts, almost all of this prior work has focused on undergraduates. The purpose of the current study was to investigate the reading strategies employed by graduate-level ELLs when reading an academic English text online. Participating in the study were four foreign-born doctoral students from different first-language backgrounds—Arabic, Korean, Urdu, and Vietnamese—and the focus was on commonalities as well as differences among them. All four were enrolled in the same doctoral-level course, which included the reading of a specific online academic article as a course requirement. When reading this text individually, each student participated in a think-aloud procedure, followed by post-reading and discourse-based interviews. Analyses included unitizing data from the think-aloud protocols, coding units for strategies employed, and considering related interview commentary and classroom contributions. In their reading, these students made major use of problem-solving strategies, especially reading segments aloud and questioning. They also employed evaluative strategies as well as metacognitive strategies, which included affirming their understanding or indicating lack of …
Date:
May 2015
Creator:
Knezek, Lois Ann
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Academic, Social and Emotional Functioning of College Students with Attention-Deficit/Hyperactivity Disorder (ADHD)
Attention deficit/hyperactivity disorder (ADHD) is frequently associated with negative occupational, social and psychological outcomes among community samples of adults; as such, it is expected that college students with ADHD face similar struggles. The research targeting this group of individuals, however, is sparse and tempered by significant limitations. The current study aimed to address methodological limitations in the current literature by including instruments to formally diagnosis ADHD and comorbid disorders, utilizing psychometrically sound instruments and comparing functioning of college students with ADHD across gender and subtype. It was hypothesized that participants with ADHD would report lower GPAs, higher levels of emotional distress and negative relationship characteristics than participants without ADHD. It was also hypothesized that participants with ADHD-combined type (ADHD-C) would report higher levels of substance and alcohol use than participants with ADHD-predominately inattentive type (ADHD-I), and that participants with ADHD-I would report higher levels of anxiety and depression than participants with ADHD-C. Women diagnosed with ADHD were expected to report higher levels of anxiety and depression than men diagnosed with ADHD; whereas, men diagnosed with ADHD were expected to report higher levels of substance and alcohol use than women. MANOVA, ANOVA and Mann-Whitney U tests were conducted to test hypotheses. …
Date:
August 2015
Creator:
McKelvy, Tara N.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Acceptance Theories for Behavior in Conducting Research: Instructors in the Rajabhat University System, Thailand
Responding to globalization and its effects on education and research development, the Thai government decided to push all public universities to become autonomous and establish a system of quality assurances. The establishment of quality assurances has had a large impact on many Thai instructors, especially in new public universities. Thai instructors are now forced to more focus on conducting research because the number of research publications is regarded as one of the main criteria for quality universities. The purpose of this study is to investigate the key factors, at the individual and university levels, which impact on the instructors' behavior in conducting research of the full-time instructors in the faculty of Management Science from the Rajabhat Universities in Thailand. The current study will help explain how and why the instructors accept or refuse to conduct research and provide insight into the salient factors motivating the instructors to produce more research by conducting HLM. Data were collected from 694 participants at 37 institutions via a questionnaire survey. The findings revealed that there was no difference among these 37 universities on behavior in conducting research. The key factors statistically influencing behavior in conducting research of the instructors were facilitating conditions, academic degree, …
Date:
December 2015
Creator:
Laksaniyanon, Benchamat
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Accurate Energetics Across the Periodic Table Via Quantum Chemistry
Greater understanding and accurate predictions of structural, thermochemical, and spectroscopic properties of chemical compounds is critical for the advancements of not only basic science, but also in applications needed for the growth and health of the U.S. economy. This dissertation includes new ab initio composite approaches to predict accurate energetics of lanthanide-containing compounds including relativistic effects, and optimization of parameters for semi-empirical methods for transition metals. Studies of properties and energetics of chemical compounds through various computational methods are also the focus of this research, including the C-O bond cleavage of dimethyl ether by transition metal ions, the study of thermochemical and structural properties of small silicon containing compounds with the Multi-Reference correlation consistent Composite Approach, the development of a composite method for heavy element systems, spectroscopic of compounds containing noble gases and metals (ArxZn and ArxAg+ where x = 1, 2), and the effects due to Basis Set Superposition Error (BSSE) on these van der Waals complexes.
Date:
December 2015
Creator:
Peterson, Charles Campbell
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Adaptive Power Management for Autonomic Resource Configuration in Large-scale Computer Systems
In order to run and manage resource-intensive high-performance applications, large-scale computing and storage platforms have been evolving rapidly in various domains in both academia and industry. The energy expenditure consumed to operate and maintain these cloud computing infrastructures is a major factor to influence the overall profit and efficiency for most cloud service providers. Moreover, considering the mitigation of environmental damage from excessive carbon dioxide emission, the amount of power consumed by enterprise-scale data centers should be constrained for protection of the environment.Generally speaking, there exists a trade-off between power consumption and application performance in large-scale computing systems and how to balance these two factors has become an important topic for researchers and engineers in cloud and HPC communities. Therefore, minimizing the power usage while satisfying the Service Level Agreements have become one of the most desirable objectives in cloud computing research and implementation. Since the fundamental feature of the cloud computing platform is hosting workloads with a variety of characteristics in a consolidated and on-demand manner, it is demanding to explore the inherent relationship between power usage and machine configurations. Subsequently, with an understanding of these inherent relationships, researchers are able to develop effective power management policies to optimize …
Date:
August 2015
Creator:
Zhang, Ziming
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Addressing Multicultural Issues in the Counselor Education Classroom: a Phenomenological Analysis
Multicultural education in counselor education is a popular topic among counselor educators and scholars. To date, scholars have focused on understanding the experiences of counselor educators who teach dedicated multicultural courses. However, less attention has been given to other counselor educators who are required by ethical and training standards to address multicultural issues across the curriculum. The purpose of this study was to understand counselor educators’ experiences addressing multicultural issues in courses that do not have a specific multicultural or diversity focus. I used phenomenological methodology to explore the experiences of counselor educators who hold doctoral degrees in counseling or a related field, have taken a multicultural/diversity course in their graduate training, are full-time clinical or tenure-line faculty members in CACREP-accredited programs, and have never taught courses dedicated to multicultural or diversity issues. Twelve participants (six men and six women), ranging in age ranged from 31 to 65, participated in the study. Ten participants identified as White, one African-American, and one Hispanic. The research team identified eight themes: (1) reasons for avoidance, (2) constraints, (3) qualities and practices, (4) educator as a factor in student development, (5) infusion, (6) personal background, (7) awareness of biases and assumptions, and (8) counselor …
Date:
December 2015
Creator:
Wagner, Terra M.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Advanced Power Amplifiers Design for Modern Wireless Communication
Modern wireless communication systems use spectrally efficient modulation schemes to reach high data rate transmission. These schemes are generally involved with signals with high peak-to-average power ratio (PAPR). Moreover, the development of next generation wireless communication systems requires the power amplifiers to operate over a wide frequency band or multiple frequency bands to support different applications. These wide-band and multi-band solutions will lead to reductions in both the size and cost of the whole system. This dissertation presents several advanced power amplifier solutions to provide wide-band and multi-band operations with efficiency improvement at power back-offs.
Date:
August 2015
Creator:
Shao, Jin
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Algorithmic Music Analysis: a Case Study of a Prelude From David Cope’s “From Darkness, Light”
The use of algorithms in compositional practice has been in use for centuries. With the advent of computers, formalized procedures have become an important part of computer music. David Cope is an American composer that has pioneered systems that make use of artificial intelligence programming techniques. In this dissertation one of David Cope’s compositions that was generated with one of his processes is examined in detail. A general timeline of algorithmic compositional practice is outlined from a historical perspective, and realized in the Common Lisp programming language as a musicological tool. David Cope’s compositional output is summarized with an explanation of what types of systems he has utilized in the analyses of other composers’ music, and the composition of his own music. Twentieth century analyses techniques are formalized within Common Lisp as algorithmic analyses tools. The tools are then combined with techniques developed within other computational music analyses tools, and applied toward the analysis of Cope’s prelude. A traditional music theory analysis of the composition is provided, and outcomes of computational analyses augment the traditional analysis. The outcome of the computational analyses, or algorithmic analyses, is represented in statistical data, and corresponding probabilities. From the resulting data sets part of …
Date:
May 2015
Creator:
Krämer, Reiner
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Alternative Certification Teaching Programs in Texas: A Historical Analysis
Before 1984, nearly 975 of teachers entered the teaching profession after graduating from a traditional university-based program. However, beginning in the mid-1980s, alternative routes leading to teacher certification began to emerge in the United States. As of 2010, nearly one-third of all new teachers graduated from an alternative preparation program. As alternative certification (AC) routes approach 30 years since establishment, programs continue to evolve and increase in enrollment. This study focused on the changes that have come about in the maturation of alternative certification programs in Texas since legislation was passed in 1985. The purpose of the study was to delineate the evolution of AC programs using a historical approach, the study used both primary and secondary resources as research tools and employed the use of eight interviews and the literature review for the collection of data. The prediction of future teacher shortages, the need for diversity in the profession the political view to privatize education, and economic recessions were all motivating factors for establishing alternative teacher programs. In the beginning, graduation from AC programs were perceived as not authentic teachers and not as prepared for teaching as graduates from traditional programs. AC programs have become a legitimate and viable …
Date:
May 2015
Creator:
Etheredge, David K.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Analysis of Market Efficiency for Exchange-traded Foreign Exchange Options on an Intraday Basis
This study examines the comparative magnitude of disturbances in intraday data for exchange traded foreign exchange (FX) options. An in-depth time series analysis on the frequency and extent of discrepancies in the disturbances is conducted. The purpose of this study is twofold. First, using intraday data and trading volume, this study attempts to determine whether both put-call parity and lower boundary conditions consistently hold for exchange traded options written on U.S. dollar denominated options on the Euro trading on the Philadelphia Stock Exchange (PHLX). Second, this study attempts to investigate the magnitude of any discrepancies that may exist due to a temporary cessation of either put-call parity or lower boundary conditions. Intraday (tick-by-tick) bid prices, ask prices, and trading volume on U.S. dollar denominated European style call options and put options on the Euro are obtained. Option data is collected through a Structured Query Language (SQL) request from the Bloomberg database. Corresponding tick-by-tick spot rates for the underlying exchange rate are obtained for the same time period. Tick-by-tick 3-month Treasury bill rates are obtained to for use as the relevant risk-free interest rate. The primary data set spans an approximate one month period from 11/1/2011 to 12/6/2011. Call and option …
Date:
May 2015
Creator:
Ren, Peter
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Animated Autoethnographies: Using Stop Motion Animation As a Catalyst for Self-acceptance in the Art Classroom
As a doctoral student, I was asked to teach a course based on emerging technologies and postmodern methods of inquiry in the field of art education. The course was titled Issues and Applications of Technology in Art Education and I developed a method of inquiry called animated autoethnography for pre-service art educators while teaching this course. Through this dissertation, I describe, analyze, interrogate, value, contextualize, reflect on, and artistically react to the autoethnographic animated processes of five pre-service art educators who were enrolled in the course. I interviewed the five participants before and after the creation of their animated autoethnographies and incorporated actor-network theory within the theoretical analysis to study how the insights of my students’ autoethnographies related to my own animations and life narratives. The study also examines animated autoethnography as a method of inquiry that may develop or enhance future teaching practices and encourage empathic connections through researching the self. These selected students created animations that accessed significant life moments, personal struggles, and triumphs, and they exhibited unique representations of self. Pre-service art educators can use self-research to create narrative-based short animations and also use socio-emotional learning to encourage the development of empathy within the classroom. I show …
Date:
August 2015
Creator:
Blair, Jeremy Michael
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
An Application of Marxian and Weberian Theories of Capitalism: the Emergence of Big Businesses in the United States, 1861 to 1890
This study was an examination of businesses that became big businesses in the United States during the time period between the years of 1861 and 1890, a period of time frequently referred to as the “big business era.” The purpose of the study was to identify actions taken by businesses that enabled them to become and remain big businesses. A secondary purpose of the study was to show that these actions were explained by theories of Karl Marx and Max Weber. The results of the study showed that businesses which took specific actions were able to become and remain big businesses and these actions were explained by the theories of Marx and Weber. The results of the study demonstrate the ability of classical sociological theory to explain macro-level social change.
Date:
May 2015
Creator:
Magness, Penny J.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Application of the Correlation Consistent Composite Approach to Biological Systems and Noncovalent Interactions
Advances in computing capabilities have facilitated the application of quantum mechanical methods to increasingly larger and more complex chemical systems, including weakly interacting and biologically relevant species. One such ab initio-based composite methodology, the correlation consistent composite approach (ccCA), has been shown to be reliable for the prediction of enthalpies of formation and reaction energies of main group species in the gas phase to within 1 kcal mol-1, on average, of well-established experiment, without dependence on experimental parameterization or empirical corrections. In this collection of work, ccCA has been utilized to determine the proton affinities of deoxyribonucleosides within an ONIOM framework (ONIOM-ccCA) and to predict accurate enthalpies of formation for organophosphorus compounds. Despite the complexity of these systems, ccCA is shown to result in enthalpies of formation to within ~2 kcal mol-1 of experiment and predict reliable reaction energies for systems with little to no experimental data. New applications for the ccCA method have also been introduced, expanding the utility of ccCA to solvated systems and complexes with significant noncovalent interactions. By incorporating the SMD solvation model into the ccCA formulation, the Solv-ccCA method is able to predict the pKa values of nitrogen systems to within 0.7 pKa unit (less …
Date:
May 2015
Creator:
Riojas, Amanda G.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Áskell Másson’s Solos for Snare Drum: Maximizing Musical Expression Through Varying Compositional Techniques and Experimentation in Timbre
This dissertation and accompanying lecture recital explores the musical elements present in Áskell Másson’s three solos for snare drum, PRÍM (1984), KÍM (2001) and B2B: Back to Basics (2010). Two of the primary challenges for the performer when playing solo literature on a non-pitch oriented instrument are identifying thematic structures and understanding how to interpret all innovative sound production techniques employed within the music. A thematic and compositional analysis, as well as an investigation into the experimentation of timbre found in Másson’s three pieces for solo snare drum will help to clarify the musical complexities that are present throughout.
Date:
December 2015
Creator:
O’Neal, John Micheal
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Atomistic Simulations of Deformation Mechanisms in Ultra-Light Weight Mg-Li Alloys
Mg alloys have spurred a renewed academic and industrial interest because of their ultra-light-weight and high specific strength properties. Hexagonal close packed Mg has low deformability and a high plastic anisotropy between basal and non-basal slip systems at room temperature. Alloying with Li and other elements is believed to counter this deficiency by activating non-basal slip by reducing their nucleation stress. In this work I study how Li addition affects deformation mechanisms in Mg using atomistic simulations. In the first part, I create a reliable and transferable concentration dependent embedded atom method (CD-EAM) potential for my molecular dynamics study of deformation. This potential describes the Mg-Li phase diagram, which accurately describes the phase stability as a function of Li concentration and temperature. Also, it reproduces the heat of mixing, lattice parameters, and bulk moduli of the alloy as a function of Li concentration. Most importantly, our CD-EAM potential reproduces the variation of stacking fault energy for basal, prismatic, and pyramidal slip systems that influences the deformation mechanisms as a function of Li concentration. This success of CD-EAM Mg-Li potential in reproducing different properties, as compared to literature data, shows its reliability and transferability. Next, I use this newly created potential …
Date:
May 2015
Creator:
Karewar, Shivraj
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Attachment Theory Within Clinical Supervision: Application of the Conceptual to the Empirical
Attachment theory has established itself as applicable to many types of relationships, encompassing caregiver-child, romantic, interpersonal, and psychotherapeutic interactions. This project sought to investigate the application of attachment theory to clinical supervision. Using suggestions put forth in previous work by Watkins and Riggs, this study examined the dyadic interactions inherent in both supervision and attachment. Using the working alliance as determination of the quality of supervision, attachment styles, leader-follower attachment, and attachment-based expectations were explored as predictors for supervisor-trainee dyad outcome in a training clinic for doctoral psychology students. The study design is longitudinal and prospective. Findings indicate the necessity of measurement of supervisory-specific attachment rather than general attachment, the stability of working alliance over time, and the large contribution of the leader-member attachment framework to the understanding of supervisory attachment. Implications include the importance of maintaining hierarchical, evaluative boundaries within supervisory relationship, consistent with a leader-follower dynamic.
Date:
August 2015
Creator:
Wrape, Elizabeth R.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Automatic Language Identification for Metadata Records: Measuring the Effectiveness of Various Approaches
Automatic language identification has been applied to short texts such as queries in information retrieval, but it has not yet been applied to metadata records. Applying this technology to metadata records, particularly their title elements, would enable creators of metadata records to obtain a value for the language element, which is often left blank due to a lack of linguistic expertise. It would also enable the addition of the language value to existing metadata records that currently lack a language value. Titles lend themselves to the problem of language identification mainly due to their shortness, a factor which increases the difficulty of accurately identifying a language. This study implemented four proven approaches to language identification as well as one open-source approach on a collection of multilingual titles of books and movies. Of the five approaches considered, a reduced N-gram frequency profile and distance measure approach outperformed all others, accurately identifying over 83% of all titles in the collection. Future plans are to offer this technology to curators of digital collections for use.
Date:
May 2015
Creator:
Knudson, Ryan Charles
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The “Avant-pop” Style of Jacob Ter Veldhuis: Annotated Bibliography of Boombox Pieces with an Analysis of “Pimpin’” for Baritone Saxophone and Boombox
JacobTV has spent over thirty years utilizing his interest in American pop culture as the muse upon which he creates his works. Sources of popular culture including commercials, television evangelists, political speeches, interviews, and urban pop songs have earned him the title of the “Andy Warhol of new music.” His contributions to classical music are significant and include works for solo instruments and voice, chamber ensembles, and large ensembles. This study serves as an annotated bibliography of selected pieces written for saxophone and boombox written by JacobTV. Chapter 2 provides a brief historical background of electronic music and chapter 3 describes JacobTV’s compositional style and vocabulary. The pieces included in the bibliography of chapter 4 are Believer (2006) for baritone saxophone and soundtrack; Billie (2003) for alto saxophone and soundtrack; Buku (2006) for alto saxophone and soundtrack; Garden of Love (2002) for soprano saxophone and soundtrack; Grab It! (1999) for tenor saxophone and soundtrack; May This Bliss Never End (1996) for tenor saxophone, piano, and soundtrack; TaTaTa (1998) for tenor and baritone saxophone and soundtrack; Heartbreakers (1997-98) for saxophone quartet, soundtrack, and video; Jesus Is Coming (2003) for saxophone quartet and soundtrack; Pitch Black (1998) for saxophone quartet and soundtrack; …
Date:
August 2015
Creator:
Roberts, Sarah L.
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Back on the Home Front: Demand/Withdraw Communication and Relationship Adjustment Among Student Veterans
Today’s military encompasses a wide variety of families who are affected by deployments in multiple and complex ways. Following deployments, families must reconnect in their relationships and reestablish their way of life. Appropriate and effective communication during this time is critical, yet many military couples struggle with this process. Moreover, student service members/veterans and their families are in a unique position. In addition to coping with changes in their marital relationship, student veterans may feel isolated or unsupported on college campuses, often experiencing anxiety, depression, posttraumatic stress, or suicidality. The current study seeks to bridge the gap between the military family literature and the student service member/veteran literature by examining how deployment experiences, mental health issues, and communication patterns influence post-deployment relationship adjustment among student veterans. Analyses tested whether communication style and/or current mental health concerns mediate associations between combat experiences and couples’ relationship adjustment, as well as between experiences in the aftermath of battle and relationship adjustment. Results suggest that although posttraumatic stress is significantly related to deployment experiences among student veterans, participants report no significant negative effects of deployment on relationship adjustment. Communication style, however, was significantly associated with relationship adjustment, and a lack of positive communication was …
Date:
August 2015
Creator:
Carver, Kellye Diane Schiffner
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
The Bass Clarinetist’s Pedagogical Guide to Excerpts From the Wind Band Literature
Student clarinet performers often encounter bass clarinet for the first time in a high school or university wind ensemble, so it is logical for clarinet pedagogues to encourage and assist their students in learning this wind band literature. In addition to becoming familiar with this oft performed repertoire, students will develop a set of specialized bass clarinet skills that one cannot learn on soprano clarinet. These skills include increased air capacity and support, timbre consistency in differing registers, intonation tendencies of the lower instrument, voicing flexibility, right hand thumb dexterity for keys that do not exist on soprano clarinet, technical facility for eleven pinky keys (as opposed to the seven pinky keys on a typical soprano clarinet, and effective altissimo fingerings. The purpose, then, of this document is to provide a performance guide for select bass clarinet solo excerpts from the wind band literature and to provide supplemental exercises intended to help students acquire the specialized bass clarinet skill set they will need in order to perform the selected excerpts successfully. The solos discussed in this document are excerpted from H. Owen Reed’s La Fiesta Mexicana, Florent Schmitt’s Dionysiaques, Percy Grainger’s Lincolnshire Posy, Frank Ticheli’s Blue Shades, William Bolcom’s First …
Date:
August 2015
Creator:
Bland, Britni Cheyenne
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Bass Reeves: a History • a Novel • a Crusade, Volume 1: the Rise
This literary/historical novel details the life of African-American Deputy US Marshal Bass Reeves between the years 1838-1862 and 1883-1884. One plotline depicts Reeves’s youth as a slave, including his service as a body servant to a Confederate cavalry officer during the Civil War. Another plotline depicts him years later, after Emancipation, at the height of his deputy career, when he has become the most feared, most successful lawman in Indian Territory, the largest federal jurisdiction in American history and the most dangerous part of the Old West. A preface explores the uniqueness of this project’s historical relevance and literary positioning as a neo-slave narrative, and addresses a few liberties that I take with the historical record.
Date:
August 2015
Creator:
Thompson, Sidney, 1965-
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Belief Transfers in Co-branding and Brand Extension and the Roles of Perceptual Fit
Existing co-branding and brand extension research generally coalesces around two important constructs: perceptual fit and attitude toward the brand. Studies in co-branding and brand extension to date have generally emphasized the transference of affective elements of attitude from parent brand to the extension. Researchers and practitioners clearly need to learn more about the transfer of belief, the cognitive elements of attitude. Too little is currently known about whether and how beliefs are actually transferred in co-branding and brand extension applications, particularly in terms of perceptual fit. This dissertation investigates belief transfer and the effect of perceptual fit on belief transfer in co-branding and brand extension scenarios and develops answers to the following research questions: 1.Are different categories of beliefs transferable from parent brand to theextension? 2.How do various sub-dimensions of perceptual fit affect belief transfers fromparent brands to the extension? 3.How do different categories of beliefs affect consumers’ intentions to purchasethe extension products? Categorization Theory was used as the fundamental theory to build the hypotheses. This dissertation involved qualitative studies, belief scale development, and experimental design studies. The results revealed that aesthetic and functional beliefs are positively transferred from parent brand to the extension. The transfer of aesthetic beliefs is …
Date:
May 2015
Creator:
Roswinanto, Widyarso
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Biological Applications of a Strongly Luminescent Platinum (II) Complex in Reactive Oxygen Species Scavenging and Hypoxia Imaging in Caenorhabditis elegans
Phosphorescent transition metal complexes make up an important group of compounds that continues to attract intense research owing to their intrinsic bioimaging applications that arise from bright emissions, relatively long excited state lifetimes, and large stokes shifts. Now for biomaging assay a model organism is required which must meet certain criteria for practical applications. The organism needs to be small, with a high turn-over of progeny (high fecundity), a short lifecycle, and low maintenance and assay costs. Our model organism C. elegans met all the criteria. The ideal phosphor has low toxicity in the model organism. In this work the strongly phosphorescent platinum (II) pyrophosphito-complex was tested for biological applications as a potential in vivo hypoxia sensor. The suitability of the phosphor was derived from its water solubility, bright phosphorescence at room temperature, and long excited state lifetime (~ 10 µs). The applications branched off to include testing of C. elegans survival when treated with the phosphor, which included lifespan and fecundity assays, toxicity assays including the determination of the LC50, and recovery after paraquat poisoning. Quenching experiments were performed using some well knows oxygen derivatives, and the quenching mechanisms were derived from Stern-Volmer plots. Reaction stoichiometries were derived from …
Date:
December 2015
Creator:
Kinyanjui, Sophia Nduta
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library
Can Akers’ Social Structure and Social Learning Theory Explain Delinquent Behaviors Among Turkish Adolescents?
The aim of this study was to examine to what extent Social Structure and Social Learning Theory (SSSL) explains delinquent behaviors among Turkish adolescents. While Social Structure and Social Learning (SSSL) Theory have been examined quite frequently in the criminology and sociology literature, the present study is unique as it tests the theory in Turkey, a context with a mixed Islamic and Secular cultural structure. The data originates from a survey conducted in Istanbul in 2008 by the Icelandic Centre for Social Research and Analysis (ICSRA) under the auspices of their Youth in Europe project. The sample includes 2,445 Turkish high school students. The dependent variable includes a 13-item delinquency scale, and the independent variables consist of differential association, costs and rewards of differential reinforcement, definitions, imitation, differential location in the social structure, and differential social location of groups. The statistical analyses were conducted using a negative binomial regression approach. Results demonstrated that differential association (peer delinquency) is positively associated with delinquent behaviors among Turkish adolescents. In addition, there is a significant and positive relationship between norms/beliefs that favor delinquency and delinquent behaviors. Moreover, parental reaction, a measure of differential reinforcement, has a negative impact on delinquency. Imitation variables, which …
Date:
August 2015
Creator:
Solakoglu, Ozgur
Object Type:
Thesis or Dissertation
System:
The UNT Digital Library