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"Running from My Youth": Essays

Access: Use of this item is restricted to the UNT Community
Running From My Youth: Essays is a collection of nonfiction essays that explore important moments and experiences from the narrator's youth, and how he has addressed and remembered them in the years since. Some of the essays explore the narrator's time as a distance-runner, while others explore the awkwardness and discomfort onset by religion and nudity.
Date: December 2019
Creator: Jernigan, Hunter Jason Alexander
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Semiconducting Aromatic Boron Carbide Films for Neutron Detection and Photovoltaic Applications (open access)

Semiconducting Aromatic Boron Carbide Films for Neutron Detection and Photovoltaic Applications

Semiconducting aromatic-boron carbide composite/alloyed films formed by plasma enhanced chemical vapor deposition from carborane and aromatic precursors have been demonstrated to be excellent detectors for thermal neutrons because of the large 10B cross section. The electronic properties of these films derived from XPS show that the properties of boron carbide can be tuned by co-deposition of aromatic compounds and carborane. Aromatic doping results in narrower indirect band gaps (1.1 - 1.7 eV vs ~3 eV for orthocarborane-derived boron carbide without aromatics) and average charge transport lifetimes (as long as 2.5 ms for benzene-orthocarborane and 1.5 - 2.5 ms for indole-orthocarborane) that are superior to those of boron carbide (35 µs). The films also show enhanced electron-hole separation that is also superior to those of boron carbide where the states at the top of the valence band is made of aromatic components while states at the bottom of the conduction band is a combination of aromatic and carborane moeities. These properties result in greatly enhanced (~850%) charge collection, relative to films without aromatic content, in thermal neutron exposures at zero-bias, and are gamma-blind. Such films are therefore excellent candidates for zero-bias neutron detector applications. These properties also show little variation with …
Date: December 2019
Creator: Oyelade, Adeola O
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Shaping Procedure for Introducing Horses to Clipping (open access)

A Shaping Procedure for Introducing Horses to Clipping

The purpose of the current study is to evaluate a procedure that can be used to introduce horses to clipping. Negative reinforcement was used in a shaping paradigm. Shaping steps were conducted by the handler, starting with touching the horse with the hand, then touching the horse with the clippers while they are off, culminating with touching the horse with the clippers while they are on. When a horse broke contact with either the hand or the clippers, the hand or the clippers were held at that point until the horse emitted an appropriate response. When the horse emitted an appropriate response, the clippers were removed, and the handler stepped away from the horse. For all eight horses, this shaping plan was effective in enabling the clipping of each horse with minimal inappropriate behavior and without additional restraint. The entire process took under an hour for each horse.
Date: December 2019
Creator: Hardaway, Alison K
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Shepherding Network Security Protocols as They Transition to New Atmospheres: A New Paradigm in Network Protocol Analysis (open access)

Shepherding Network Security Protocols as They Transition to New Atmospheres: A New Paradigm in Network Protocol Analysis

The solutions presented in this dissertation describe a new paradigm in which we shepherd these network security protocols through atmosphere transitions, offering new ways to analyze and monitor the state of the protocol. The approach involves identifying a protocols transitional weaknesses through adaption of formal models, measuring the weakness as it exists in the wild by statically analyzing applications, and show how to use network traffic analysis to monitor protocol implementations going into the future. Throughout the effort, we follow the popular Open Authorization protocol in its attempts to apply its web-based roots to a mobile atmosphere. To pinpoint protocol deficiencies, we first adapt a well regarded formal analysis and show it insufficient in the characterization of mobile applications, tying its transitional weaknesses to implementation issues and delivering a reanalysis of the proof. We then measure the prevalence of this weakness by statically analyzing over 11,000 Android applications. While looking through source code, we develop new methods to find sensitive protocol information, overcome hurdles like obfuscation, and provide interfaces for later modeling, all while achieving a false positive rate of below 10 percent. We then use network analysis to detect and verify application implementations. By collecting network traffic from Android …
Date: December 2019
Creator: Talkington, Gregory Joshua
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Solo Piano Collections "Reaching Out" and "Travels Through Sound" by Emma Lou Diemer: Pedagogical Guidelines for Contemporary Techniques for Intermediate-Level Students (open access)

The Solo Piano Collections "Reaching Out" and "Travels Through Sound" by Emma Lou Diemer: Pedagogical Guidelines for Contemporary Techniques for Intermediate-Level Students

Emma Lou Diemer (b. 1927) is a leading American composer, pianist, and educator. Although she composed many outstanding advanced-level piano works, she also believes that composing for other levels is a good discipline for composers. Her two collections Reaching Out and Travels Through Sound contain various contemporary techniques that are highly approachable for intermediate-level students. The purpose of this study is to provide a pedagogical guide to contemporary elements present in these collections, which are ideal for developing skills that can prepare intermediate-level students for more complex modern music. Diemer incorporates such contemporary features as complex rhythms and meters, non-traditional notations, and extended piano techniques, as well as non-traditional textures and forms. These techniques are presented in a compact and informative but not too complicated manner, so that intermediate-level students can master them.
Date: December 2019
Creator: Yum, Ji-Eun
Object Type: Thesis or Dissertation
System: The UNT Digital Library
A Somatic Mindfulness Project Exploring the Effects of Meditation on Art Appreciation in the Gallery Setting (open access)

A Somatic Mindfulness Project Exploring the Effects of Meditation on Art Appreciation in the Gallery Setting

This dissertation describes the effects of a somatic mindfulness project on the way participants interact with and respond to works of art in a gallery setting. The study begins with a critique of Descartes' philosophy, Cartesianism, which emphasizes the role of the mind over that of the body and senses and argues that this thought continues to affect education even today. By contrast, phenomenology and mindfulness practices attempt to overcome Descartes' legacy by focusing on the importance of the body in lived experience. In particular, this study uses a phenomenological framework to conduct mindfulness on the relationship between the body and the perception of art. To do so, I utilized several phenomenological techniques for gathering data, including observations, video, and interviews, and I also created a unique method to analyze the data using a phenomenological verbal (written) description and visual (through photographic paintings) description. These techniques worked together to express the moment of reversibility between the meditative body and the artworks in the gallery setting. In sum, the findings of this study show that meditation changes the perceptual experience for different people in different ways. Another finding is that different forms of meditation may work better for some people than …
Date: December 2019
Creator: Bassi, Merfat Mohammed
Object Type: Thesis or Dissertation
System: The UNT Digital Library
South Texas Catholic (Corpus Christi, Tex.), Vol. 54, No. 11, Ed. 1, December 2019 (open access)

South Texas Catholic (Corpus Christi, Tex.), Vol. 54, No. 11, Ed. 1, December 2019

Monthly newspaper from Corpus Christi, Texas published by the Diocese of Corpus Christi that includes news of interest to Diocese members along with advertising.
Date: December 2019
Creator: Cottingham, Mary
Object Type: Newspaper
System: The Portal to Texas History
Southwest Retort, Volume 72, Number 4, December 2019 (open access)

Southwest Retort, Volume 72, Number 4, December 2019

This publication of the Dallas-Fort Worth Section of the American Chemical Society includes information about research, prominent scientist, organizational business, and various other stories of interest to the community.
Date: December 2019
Creator: American Chemical Society. Dallas/Fort Worth Section.
Object Type: Journal/Magazine/Newsletter
System: The UNT Digital Library

Spatial Partitioning Algorithms for Solving Location-Allocation Problems

Access: Use of this item is restricted to the UNT Community
This dissertation presents spatial partitioning algorithms to solve location-allocation problems. Location-allocations problems pertain to both the selection of facilities to serve demand at demand points and the assignment of demand points to the selected or known facilities. In the first part of this dissertation, we focus on the well known and well-researched location-allocation problem, the "p-median problem", which is a distance-based location-allocation problem that involves selection and allocation of p facilities for n demand points. We evaluate the performance of existing p-median heuristic algorithms and investigate the impact of the scale of the problem, and the spatial distribution of demand points on the performance of these algorithms. Based on the results from this comparative study, we present guidelines for location analysts to aid them in selecting the best heuristic and corresponding parameters depending on the problem at hand. Additionally, we found that existing heuristic algorithms are not suitable for solving large-scale p-median problems in a reasonable amount of time. We present a density-based decomposition methodology to solve large-scale p-median problems efficiently. This algorithm identifies dense clusters in the region and uses a MapReduce procedure to select facilities in the clustered regions independently and combine the solutions from the subproblems. Lastly, …
Date: December 2019
Creator: Gwalani, Harsha
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Spectral, Electrochemical, Electron Transfer, and Photoelectrochemical Studies of Tetrapyrrole Derived Supramolecular Systems (open access)

Spectral, Electrochemical, Electron Transfer, and Photoelectrochemical Studies of Tetrapyrrole Derived Supramolecular Systems

Energy- and electron-transfer processes in molecular and supramolecular donor-acceptor systems are of current interest in order to develop light-energy harvesting systems through designing covalently linked donor-acceptor systems or utilizing self-assembled donor-acceptor systems. The research presented in this dissertation deals with the electrochemical, anion binding, and photochemical studies of various oxoporphyrinogen (OxPs), porphyrin, corrole, and phenothiazine systems. The first chapter provides a brief introduction to the material discussed in the subsequent chapters. The second chapter discusses the bromination of meso-tetraarylporphyrings and how that affects their electrochemical, catalytic, and other properties. Bromination of these porphyrins and oxoporphyrinogens allow the HOMO-LUMO gap to increase revealing blue-shifted absorption. Brominated OxPs and bis-crown ether OxP self-assembled with anions depending on strength of the anion and size of the binding site. The addition of crown ethers allows a cation binding site which makes a self-assembled donor-acceptor supramolecular system.Chapters 5 and 6 discuss a series of donor-acceptor conjugates based on zinc porphyrin as the electron donor and copper(III) corrole as the electron acceptor. These studies illustrate the importance of copper(III) corrole as a potent electron acceptor for the construction of energy harvesting model compounds, and constitute the first definitive proof of charge separation in ZnP-CuIIIC systems.Chapter 7 …
Date: December 2019
Creator: Webre, Whitney Ann
Object Type: Thesis or Dissertation
System: The UNT Digital Library
State Capacity, Security Forces and Terrorist Group Termination (open access)

State Capacity, Security Forces and Terrorist Group Termination

This dissertation examines how different forms of state capacity affect the decision of terror groups to end their campaign. Building a theoretical framework about the relationship between state capacity and terrorist group termination, I address the following research questions: How do terror groups respond to the changes in non-repressive forms of state's capacity, such as bureaucratic capacity, extractive capacity, and how do those responses of terror groups affect the chance of their demise? How do the changes in non-repressive forms of state capacity affect the likelihood of termination of particular types of terror groups, specifically ethnic terror groups? And finally, how do security forces representing repressive capacity of states affect the probability of a terrorist group end? I argue that as the state fighting the terror group increases its capacity, that will generate an incentive for the terror group to respond to increasing state capacity to secure its survival and maintain its existence. As the terror group produces responses to increasing state capacity in terms of rebuilding its capacity to operate and keeping its popular support base intact, it will be less likely to end its terror campaign. This argument is particularly relevant for terror groups operating on behalf of …
Date: December 2019
Creator: Kirisci, Mustafa
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Student Nonviolent Coordinating Committee and Racial Dynamics: The Importance of SNCC's Arkansas Project, 1962-1966 (open access)

The Student Nonviolent Coordinating Committee and Racial Dynamics: The Importance of SNCC's Arkansas Project, 1962-1966

In this thesis I look at the Arkansas Project and more specifically the racial dynamics within the project and the surrounding communities in Arkansas where SNCC engaged to assist the residents fight for their civil rights. In addition, I analyze how the differences in the urban and rural communities were affected by the racial dynamics of the project's leadership. The Arkansas project was led by William Hansen, a white man, which made him and the project unique from not only other SNCC projects, but other civil rights organizations. This distinction made the strategy that had to be implemented with the project staff internally and also externally in the Arkansas communities different because his race had to be taken into consideration for all purposes. Another aspect that came into play in Arkansas was the fact that some of their activities occurred in urban communities and others occurred in rural communities. These difference in communities affected not only how the local blacks received the SNCC volunteers, but also affected how local whites received the SNCC volunteers. Although the fact that the Arkansas Project had a white field director made it unique and the racial dynamics worthy of scholarly investigation, Bill Hansen's racial …
Date: December 2019
Creator: Lacy, David Aaron
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Study of Homeless Emergency Discharge Coordination: Understanding Challenges and Success Factors to Collaboration Maturity (open access)

Study of Homeless Emergency Discharge Coordination: Understanding Challenges and Success Factors to Collaboration Maturity

Successful service coordination for the homeless depends on the ability of diverse organizations to effectively collaborate. This study utilizes a life-cycle framework to expand on the collaborative governance theory by highlighting the different stages of collaboration that homeless service networks encounter. Activation, collectivity, and institutionalization are three stages used to uncover the unique nature of emergency discharge planning processes. Since collaboration is not a static process and government regulation for emergency discharge plans were recently enacted in 2012, collaborative networks encounter challenges and success factors at different stages. A qualitative case-study approach of organizational leaders in homeless service networks in Texas (Dallas, Ft. Worth and Houston) examines stages of collaboration. Results show common success and challenge factors identified among the three networks, but the factors take on different forms in relation to where the networks are at in the coordination stages. Practitioners can use the findings from this study as a guide to set up benchmarks and measurable objectives to identify strengths and weaknesses in their coordination processes.
Date: December 2019
Creator: Washington, Federickia L
Object Type: Thesis or Dissertation
System: The UNT Digital Library

A Study of Selected Pedagogical Aspects of Two Intercultural Pieces for Late Intermediate and Early Advanced Students: "Variations sur un thème populaire coréen" by Sung-Ki Kim and "Six Pieces for Piano ‘Nori'" by Chung-Sock Kim

Access: Use of this item is restricted to the UNT Community
I contend that young students should be introduced to intercultural contemporary music, as this exposure brings benefits to their artistic development and fosters appreciation of other cultures. Variations sur un thème populaire coréen by Sung-Ki Kim (b. 1954) and Six Pieces for Piano ‘Nori' by Chung-Sock Kim (b. 1940) are effective pedagogical works that fit perfectly into the intercultural mold mentioned above, and both are suitable for late intermediate or early advanced level students. A detailed comparison of these two works can help instructors understand the ways by which these composers incorporate Korean folk materials and blend them with Western contemporary techniques. An analysis of Sung-Ki Kim's Variations sur un theme populaire coréen and Chung-Sock Kim's Six Pieces for Piano ‘Nori' can be divided into three categories: harmony, rhythm, and performance-related aspects. By analyzing these two pieces, these study illustrates in greater depth their intercultural aspects, showing the way by which both composers merged traditional Korean folk idioms through the inclusion of traditional Korean rhythms, and the imitation of sounds of several traditional Korean instruments with Western contemporary technique such as non-traditional sounds and use of sostenuto pedal. Finally, this study provides some practicing suggestions and listing exercise on how …
Date: December 2019
Creator: Choi, Yujin
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Survey of Psychology Professionals on Their Involvement in Sport and Performance Psychology Services (open access)

Survey of Psychology Professionals on Their Involvement in Sport and Performance Psychology Services

This study examined professional practice issues in sport psychology such as qualifications, credentialing, graduate training, and the scope of practice in order to address questions about who should be teaching and providing such services. We used frequencies, t-tests, and chi-square analyses to assess trends among licensed psychologists in the subdiscipline of sport psychology. Analyses show that 26.7% (n = 52) reported providing services to individual athletes and 17.9% (n = 35) to teams in which their work focused on directly improving sport performances. Additionally, 58.5% (n = 114) reported providing mental health services to individual athletes and 10.3% (n = 20) to sport teams. These results suggest services provided to individual athletes and groups/teams of athletes seem to emphasize mental health concerns. Regarding supervision, 18.5% (n = 36) indicated they had received supervision related to improving athletes' sport performance and 35.9% (n = 70) for mental health services they had provided. Another 17.5% (n = 34) indicated having provided supervision to other professionals who were working with athletes to improve their sport performance and 40.0% (n = 78) for those who were addressing athletes' mental health. Overall, 26 (13.3%) of the psychologists had published articles concerning sport and performance psychology …
Date: December 2019
Creator: Jackson, Randi D.
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Synthesis and Characterization of β-Functionalized π-Extended Porphyrins (open access)

Synthesis and Characterization of β-Functionalized π-Extended Porphyrins

Porphyrins with extended π-electronic networks are promising candidates for a wide range of applications from medicine to nanotechnology owing to their unique optical and electronic properties. This dissertation is focused on synthesis, characterization and application of β-functionalized π-extended porphyrins. This dissertation is comprised of seven chapters. Chapter 1 focuses on the importance and objective of this work. Chapter 2 gives brief introduction to porphyrins and π-extended porphyrins. In chapter 3, a class of β-functionalized linear push-pull zinc dibenzoporphyrins YH1-YH3 were designed, synthesized, and utilized as light harvesters for DSSCs. In chapter 4, in order to further enhance the photovoltaic performance of β-functionalized benzoporphyrin dyes based DSSCs, a new class of push-pull dibenzoporphyrins YH4-YH7 bearing the phenylethynyl bridge was designed, synthesized and utilized as light harvesters for DSSCs. In chapter 5, in order to solve the photodegradation problem associated with YH7, a new series of push-pull dibenzoporphyrins YH8-YH10 bearing different diarylamino push groups was designed and synthesized. This class of push-pull porphyrins shows improved photostability and enhanced DSSC performance. In chapter 6, a new pentacene-fused diporphyrin with high stability and solubility was prepared and characterized. Chapter 7 includes the summary of this dissertation and describes possible future work.
Date: December 2019
Creator: Hu, Yi
Object Type: Thesis or Dissertation
System: The UNT Digital Library

Tchaikovsky's Piano Concerto No. 1 In B-Flat Minor, Op. 23: A Newly Arranged Edition of the Orchestral Reduction

Access: Use of this item is restricted to the UNT Community
As it stands, only one arrangement of Tchaikovsky's Piano Concerto No. 1, Op. 23 orchestral reduction exists, which is by Tchaikovsky himself. A number of critical editions of the piece exist, but none of them cover the subject of the material within the orchestral reduction. Tchaikovsky wrote the reduction from a compositional rather than a pianistic perspective, thus some passages present awkward technical challenges. The purpose of this dissertation is ultimately to contribute to the repertoire of accompanists by producing a new edition of Tchaikovsky's Piano Concerto No. 1. I created my arrangement through a process of practical trial and error as well as observing the strategies used by other arrangers of orchestral reductions. Through a series of carefully selected omissions, note rearrangements, visual adjustments, and editorial changes, I simplified the reduction as a whole. I sought to improve the readability of the music by reducing accidentals as much as possible and also incorporating small-print cues into the main staves. Each minor adjustment or major revision contributes cumulatively to the ease of execution of the accompanimental part as a whole. Although Tchaikovsky's reduction is authentic and authoritative, a newly revised and simplified version would be useful for collaborative pianists. Thus, …
Date: December 2019
Creator: Parys, Marcin
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Teaching Children How to Stay Still Using Movies to Provide Continuous Feedback (open access)

Teaching Children How to Stay Still Using Movies to Provide Continuous Feedback

External beam radiation therapy is often used as a form of treatment for individuals diagnosed with cancer. However, because staying completely still can often be difficult for children, sedation is often used daily to remedy the need for stillness. In this document, we introduce the development, implementation, and testing of a technology designed to teach healthy children to self-monitor and control their movements. This technology monitored a child's body movement and created a continuous feedback loop, playing a preferred movie based on the amount of body movement observed. Study 1 compares the amount of body movement observed when children were instructed to remain still (instructions alone) to access to a movie contingent on maintained low rates of movement (contingent movie). Study 2 compares the amount of body movement observed in the instructions alone condition with two other conditions: non-contingent access to a movie (non-contingent movie) and contingent movie. Study 3 compares the amount of body movement observed in the instructions alone condition to the contingent movie condition over an extended period of time. Lastly, Study 4 compares the amount of body movement observed when children have previously been taught to stay still using the technology described above across various days …
Date: December 2019
Creator: Otero, Maria Jose
Object Type: Thesis or Dissertation
System: The UNT Digital Library
The Teaching of 21st Century Skills through Project-Based Learning and Professional Development for Career and Technical Education (open access)

The Teaching of 21st Century Skills through Project-Based Learning and Professional Development for Career and Technical Education

The purpose of this non-experimental, quantitative study is to investigate the relationship between the use of project-based learning (PBL) by secondary business teachers and time spent in professional development of secondary business teachers for the teaching of 21st century skills. The four identified 21st century skills that will be researched include: (1) critical thinking, (2) collaboration, (3) communication, (4) creativity and innovation. A sample of 316 secondary business teachers were surveyed about their classroom practice and reflection of teaching 21st century skills. This study used a modified version of the 21st Century Teaching and Learning Survey. Survey results were analyzed for relationships using correlational and regression analysis. Business teachers reported a statistically strong relationship between the use of PBL and the teaching of 21st century skills. A statistically significant relationship between time spent in professional development and the teaching of 21st century skills was not found. Regression results indicated that the use of PBL had an impact on the teaching of 21st century skills. This research guides teachers, school administrators, and CTE directors at the state and district level towards the creation of professional development and implementation strategies when applying PBL methods in career and technical education settings.
Date: December 2019
Creator: Petrunin, Kristin Firmery
Object Type: Thesis or Dissertation
System: The UNT Digital Library
As the Need Presents Itself: Social Identity Theory and Signaling in Online Crowdfunding Campaigns (open access)

As the Need Presents Itself: Social Identity Theory and Signaling in Online Crowdfunding Campaigns

As social interactions increasingly become exclusively online, there is a need for research on the role of identity and social identity in online platforms. Drawing on Symbolic Interactionist approaches to identity, namely Social Identity Theory and Identity Theory, as well as Signaling Theory, this study argues that actors will selectively use religious language to signal their credentials to an audience for the purpose of garnering prosocial behavior in the form of donations to their fundraising campaign. Using latent semantic analysis topic models to analyze the self-presentations of crowdsourcing campaigners on GoFundMe.com, this study found evidence for the presence of signaling to a religious identity online as well as a significant difference in the presentation of need for campaigns originating in areas with high reported religiosity compared to campaigns from areas of low religiosity. In comparison to other campaigns, campaigners engaging in religious signaling were significantly increasing their donations. I suggest that strategically chosen religious topics in online crowdfunding is an example of low-cost identity signaling and provides insight into how signaling happens online and the potential outcomes resulting from this cultural work.
Date: December 2019
Creator: Hamilton, Scott J
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Training Behavior Professionals to Use the Interview-Informed Synthesized Contingency Analysis (IISCA): Extension (open access)

Training Behavior Professionals to Use the Interview-Informed Synthesized Contingency Analysis (IISCA): Extension

The current investigation replicated and extended previous research on training of behavior professionals to implement functional assessment and analysis procedures. Specifically, the study extended procedures described by Metras to train board certified behavior analysts (BCBAs) to administer two components of the Interview Informed Synthesized Contingency Analyses (IISCA) by: (1) conducting the study in the context of a large residential/training facility for adults with ID, (2) including a participant who served as a behavior analyst for a caseload of individuals who lived and received services at the facility, and (3) adjusting the vignettes and interview scripts to reflect the change in context. This current study shows that, following a brief training sequence, the participant was able to accurately administer the open-ended interview and construct a synthesized test and control condition.
Date: December 2019
Creator: Markham, Eric Nicholas
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Transgenerational Responses to Environmental Stressors in Vertebrates: From Organisms to Molecules (open access)

Transgenerational Responses to Environmental Stressors in Vertebrates: From Organisms to Molecules

Genomic modifications occur slowly across generations, whereas short-term epigenetic transgenerational inheritance of adaptive phenotypes may be immediately beneficial to large numbers of individuals, acting as a bridge for survival when adverse environments occur. In this study we used dietary exposure to crude oil as an example of an environmental stressor to assess its effects from the molecular to the organismal levels in piscine and avian animal models. In addition, we assessed the role of the parental exposures on their offspring F1 generation. The research developed in this dissertation has contributed to several areas of investigation including molecular biology, animal physiology, and evolutionary biology. The quantitative information from these studies may be utilized to supplement information regarding the proximate and ultimate effects of environmental stressors on fish and bird populations. Furthermore, this information may be used as additional support for understanding the conservation of the responses from the molecular to the whole organismal levels across the vertebrate taxa, as well as their implications for population survival and maintenance. Additionally, the zebrafish (Danio rerio), the Siamese fighting fish (Betta splendens) and the king quail (Coturnix chinensis) have proven to be excellent models to start building a strong basis for understanding the effects …
Date: December 2019
Creator: Martinez Bautista, Naim
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Transient Expression of BABY BOOM, WUSCHEL, and SHOOT MERISTEMLESS from Virus-Based Vectors in Cotton Explants:  Can We Accelerate Somatic Embryogenesis to Improve Transformation Efficiency? (open access)

Transient Expression of BABY BOOM, WUSCHEL, and SHOOT MERISTEMLESS from Virus-Based Vectors in Cotton Explants: Can We Accelerate Somatic Embryogenesis to Improve Transformation Efficiency?

Upland cotton (Gossypium hirsutum L.) is the world's most prominent fiber crop. Cotton transformation is labor intensive and time consuming, taking 12 to 18 months for rooted T0 plants. One rate limiting step is the necessary production of somatic embryos. In other recalcitrant species, ectopic expression of three genes were shown to promote somatic embryogenesis: WUSCHEL (WUS), SHOOT MERISTEMLESS (STM), and BABY BOOM (BBM). WUS is responsible for maintaining stem-cell fate in shoot and floral meristems. STM is needed to establish and maintain shoot meristems. STM and WUS have similar functions but work in different pathways; overexpression of both together converts somatic cells to meristematic and embryogenic fate. BBM encodes an AP2/ERF transcription factor that is expressed during embryogenesis and ectopic expression of BBM reprograms vegetative tissues to embryonic growth. In prior studies, these genes were constitutively expressed, and cultures did not progress beyond embryogenesis because the embryogenic signal was not turned off. In our study, we set out to use these genes to increase the efficiency of cotton transformation and decrease the time it takes to regenerate a plant. A disarmed cotton leaf crumple virus (dCLCrV) vector delivers WUS, STM, or BBM into cotton tissue cultures through Agrobacterium tumefaciens …
Date: December 2019
Creator: Alejos, Marcos
Object Type: Thesis or Dissertation
System: The UNT Digital Library
Twenty-First Century Local Food Farmers in North Texas: An Evaluation of Farming Methods, Best Practices, and Common Struggles (open access)

Twenty-First Century Local Food Farmers in North Texas: An Evaluation of Farming Methods, Best Practices, and Common Struggles

Research with local farmers and local food consumers in the North Texas area which captures a contemporary understanding of the challenges and successes present in North Texas local farm-and-food networks. Through ethnographic research methods, including participant-observation and semi-structured interviews, the network of producers and consumers around several farmers' markets were evaluated to understand where the strengths of local food lie, and where networks need development to promote a more stable local food environment. Texas is newer to the trend of farmers' market development, with the local food system developed to foster community, educate, and promote the advantages of locally sourced goods. This research led to the academic discovery of climate adaptive ecological knowledge and farm commodification strategies; which are tools that farmers may use to build greater defense against threats to a farm's livelihood.
Date: December 2019
Creator: McFarland, Kelly
Object Type: Thesis or Dissertation
System: The UNT Digital Library