Digital Commons Network^™

Air Pollution And Self-Reported Health Outcomes In The United States, Alina Dervisevic

Theses and Dissertations

This study examines the relationship between short-term PM2.5 exposure and self-reported health outcomes among U.S. adults using BRFSS data from 2000 to 2012 linked to county-level pollution and weather data. Results show that PM2.5 exposure is associated with worse mental health and gender specific behavioral responses.

Medusa, Myths And Mascarons, Claire Weaver-Zeman

Theses and Dissertations

Claire Weaver-Zeman’s work constructs an alternate mythology and decorative language based on classical mythology, biblical characters, and paganism. Paintings, dolls, frames, and other sculptural objects populate this imagined realm. This paper outlines how this reality and its inhabitants question the traditional limited roles assigned to women and children.

Neuroprotective Effects Of Prophylactic Brivaracetam On Memory And Anxiety Following Traumatic Brain Injury, Sofia Dumic

Theses and Dissertations

Prophylactic brivaracetam (BRV) was evaluated in a rat TBI model for effects on behavior and serum tau. BRV reduced anxiety-like behavior with optimal dose-dependent effects at 2.1mg/kg, but did not affect working memory. Serum tau was detectable early post-injury, supporting its use as a biomarker.

Skills, Challenges, And Career Outcomes: A Quantitative Study Of Early-Career Experiences In Research Administration, Jennifer Juliet Martinez

Theses and Dissertations

Research administration as a field lacks clearly defined entry pathways, with many professionals entering through indirect routes. These conditions contribute to variation in early-career experiences and may influence long-term outcomes. The purpose of this study was to examine how entry pathways and skills at entry relate to early-career challenges in research administration, and how those challenges are associated with career dissatisfaction.

This study used a quantitative, cross-sectional design. Data were drawn from the U.S. subset of the Research Administration as a Profession (RAAAP-3) survey. Key variables included entry pathways, skills at entry, early-career challenges, and career dissatisfaction. Findings indicate that …

The Relationship Between Secondary School Principals’ Ethical Leadership Behaviors And School Climate, Ericka Julie Carranza

Theses and Dissertations

Limited research explains how teachers in culturally and socioeconomically diverse secondary school settings experience principals’ ethical leadership behaviors and how those behaviors are perceived as shaping school climate. This qualitative study examined teachers’ perceptions of secondary school principals’ ethical leadership behaviors and the ways in which those behaviors were experienced as influencing relational, emotional, and professional dimensions of school climate.

Grounded in Social Learning Theory, the study employed a qualitative research design using semi-structured interviews and focus groups with secondary school teachers from diverse educational contexts. Data were analyzed using thematic analysis to identify patterns related to ethical leadership behaviors, …

My Journey As A Migrant Bilingual Learner From Student To Teacher: Lessons Learned, Sylvia Lopez

Theses and Dissertations

These reflections in this thesis are an analysis of narratives based on my lived experiences as an immigrant, migrant student who is now a certified Bilingual & Special Education teacher servicing students, many of whom are bilingual, in public school classrooms. My goal is to connect my life experiences to teaching practices and thus embrace and celebrate my linguistic identity. Bilingual educators have a language learning journey that drives their classroom practices. When bilingual teachers reflect on their bilingual trajectory and connect their life experiences to research, they may provide spaces for stronger positive impacts on bilingual students, and their …

Insights Into Androgen Receptor Allosteric Modulation By P,P'-Dichlorodiphenyldichloroethylene Binding At The Binding Function-3 Site And Site-Specific Binding Function-3 Mutations, Emanuel Aggeo Flores

Theses and Dissertations

One of DDT’s metabolites, p,p’-dichlorodiphenyldichloroethylene (DDE), has been classified as an endocrine disrupting chemical (EDC) due to its ability to interfere with hormone signaling by binding to nuclear receptors (NR) such as the androgen receptor (AR).

Structurally, the AR contains a ligand-binding domain (LBD) where endogenous steroids bind. Furthermore, the LBD contains a surface binding site known as binding function-3 (BF-3), which studies suggest exerts an allosteric effect on bound DHT when small, hydrophobic molecules bind.

Here, we present a study that examines how specific BF-3 site mutations and DDE binding affect steroid stability within the LBP utilizing computational methods. …

Using Behavioral Monitoring To Assess Activity Patterns And Welfare Indicators In Captive Black Howler Monkeys (Alouatta Caraya), Ramiro Gomez Iii

Theses and Dissertations

This study examined activity patterns and potential welfare indicators in captive black howler monkeys (Alouatta caraya) using behavioral monitoring techniques. A monogamous pair housed indoors at Gladys Porter Zoo was observed using focal sampling methods, and a species specific ethogram was developed to systematically record behavior. A total of 1,750 minutes of data were collected over one year. Observed behaviors were categorized into five groups: affiliative, agonistic, stationary, locomotion, and stereotypic behaviors. Activity budgets were calculated to determine the proportion of time allocated to each behavioral category. Results indicated that affiliative behaviors, particularly physical contact, dominated the activity budget, while …

An Exploratory Study On Perceptions Of Climate Change And Mental Health Among Alaskans, Emily Miranda Cohen

Theses and Dissertations

Climate change is a pressing global issue with diverse mental health impacts. However, the relationship between climate change perceptions and mental health remains poorly explored. Rapid climate change in Alaska makes it an ideal setting to explore these relationships. Thus, 204 Alaskan adults were surveyed to assess their perceptions of climate change and explore the relationships between climate change perceptions, exposure to adverse climate impacts, and psychological distress (i.e., symptoms of depression, anxiety, and climate-related post-traumatic stress). Results suggest that participants agree that climate change is real, human-caused, negative, and impacts areas both close to and far from where they …

Comparison Of The Effects Of Participation In Early Childhood Education On Readiness Outcomes, Pre- And Post-Covid-19 In A South Texas District, Maria J. Valadez Gonzales

Theses and Dissertations

This study will investigate and gather quantitative data noting if a learning gap exists when evaluating reading data of students participating in a high-quality learning program in 2020 due to the pandemic. RQ1: What gaps are evidenced by progress monitoring TPRI/TJL data from 2019 Beginning of Year (BOY) Kinder pre-pandemic when compared to 2020 post-pandemic BOY data in First grade for educationally disadvantaged students in a South Texas school district? RQ2: Do students who attend these ECE high quality prekinder programs show differing levels of academic achievement utilizing progress monitoring assessments in reading for Kinder – First grades (Wyse et …

Optimizing Citriculture In South Texas With Endemic Hlb, Ruth Lilia Galan

Theses and Dissertations

The Texas citrus industry has a long history of resilience, rebounding from environmental and economic disasters. Over the last decade it has endured several hurricanes, freezes, pests and diseases. Huanglongbing (HLB), a graft-transmissible disease caused by Gram-negative bacterium Candidatus Liberibacter asiaticus which is vectored by the Asian citrus psyllid (ACP) (Diaphorina citri Kuwayama), is an endemic citrus disease posing serious threat to the long-term viability of the industry. Rapid production of high quality nursery trees and effective protection of young citrus transplants from HLB are critical for long term sustainability of citriculture in this region. Studies were performed to improve …

Phenotypic Contribution And Regulation Of Vibrio Parahaemolyticus Cold-Shock Protein Homologue Vp1889, Oleg Borisovich Ermolinsky

Theses and Dissertations

Vibrio parahaemolyticus is the primary causative agent of a form of gastroenteritis called vibriosis commonly acquired from ingestion of raw and undercooked seafood. The primary mitigation of seafood-borne illnesses is immediate storage on ice following catch, which inhibits bacterial metabolism and replication. Mesophilic bacteria such as V. parahaemolyticus induce expression of cold-shock proteins in a process named the cold shock response, which facilitates survival at low temperatures. V. parahaemolyticus bears 3 homologues of the major Escherichia coli cold-shock protein CspA, an RNA chaperone. Induction of E. coli CspA at low temperatures depends on autogenous modulation by its mRNA structure, which …

From Homeland To The Foreign Classroom: The Salaysay Of Filipina Immigrant Teachers In Texas, Shanna Cui Miranda

Theses and Dissertations

Filipina immigrant teachers are a growing presence in Texas schools, especially as districts respond to teacher shortages by recruiting internationally trained educators. This narrative study explores the salaysay of Filipina immigrant teachers in Texas and examines how their funds of knowledge inform their teaching practice. Guided by the research question, What are the salaysay of Filipina immigrant teachers in Texas, and how do their funds of knowledge inform their teaching? The study uses Funds of Knowledge (Moll et al., 1992) as the central framework and resizes it to focus on teachers as holders of culturally developed knowledge. The resized framework …

Voices From The Classroom: Elementary Teachers’ Perspectives On Teaching And Learning During The Covid-19 Pandemic – A Case Study And Autoethnography, Alicia Lopez-Hernandez

Theses and Dissertations

Guided by constructivist learning theory and sociocultural theory, this qualitative case study and autoethnography examines how bilingual educators constructed knowledge, adapted instructional practices, and utilized mediational tools within face-to-face, online and hybrid learning environments. These frameworks informed the study’s design, data analysis, and interpretation of findings related to pedagogy, technology integration, and student engagement. Data was collected through semi-structured interviews, naturalistic observations, and autoethnographic reflective journaling.

General Chemistry Students' Perceptions Of How Various Course Resources Affect Their Learning And Exam Preparation, Jennifer Scoggin Cortez

Theses and Dissertations

The tertiary-level first-semester general chemistry course has a large range of material with different complexities that can be difficult for students to master within one semester. In the general chemistry I course under study here, students were provided with a variety of resources to help with their learning and understanding, with various components of the course, including the lecture, online textbook, Peer-Led-Team-Learning (PLTL) study sessions, and exams, having associated resources. This study aims to analyze students’ experiences with these various resources. Students were given semi-structured interviews where they talked about their experiences with the resources and provided insight into more …

Chatbots In The Classroom: Understanding The Impact Of Chatbot Integration In Writer’S Workshops On High School Students’ Writing, Gabriel Cerda

Theses and Dissertations

Writing is a complex developmental skill, and much research has been conducted to understand in which ways to best close the gaps that national data indicates exist for students in K-12 education. This quasi-experimental study explored how integrating chatbots as dialogue agents within a writer’s workshop framework influences the quality of written compositions among Grade 12 students. The research was grounded in the Direct and Indirect Effect Model of Writing (DIEW) and the Writer(s)-Within-Community (WWC) model, which emphasize both the cognitive and social-emotional dimensions of the writing process.

Participants received real-time, individualized feedback, with pre- and post-test essays evaluated using …

Assessing Water Quality And Nitrogen Dynamics In Bahia Grande, Texas Using Field And Remote Sensing Data, Sk Taufiqul Islam

Theses and Dissertations

An 8,220-acre estuary in South Texas, Bahia Grande has recently been restored from a disconnected hypersaline basin to a tidal estuary. A spatially explicit water quality index (WQI) was developed and in situ physicochemical data coupled with remote sensing data from Sentinel-2 were used to determine ecological integrity. A WQI from 29.45-53.20 yielded a spatial distribution of water quality that displayed a non-linear spatial trend throughout the estuary. Water quality close to the Brownsville Ship Channel inlet yielded values of 'Moderate/Stressed' water quality (> 50). These areas represent local zones of disturbance where ammonium concentrations were more than 11 µmol/L. …

Analyzing Criteria Air Pollutants And Meteorological Parameters In The Rio Grande Valley, Laredo, And Corpus Christi Region Of South Texas, Angela Garcia

Theses and Dissertations

Recently, the Rio Grande Valley has experienced significant population growth due to economic opportunities, cross-border commerce, SpaceX, and the Rio Grande and Texas liquid natural export terminal presence. The Rio Grande Valley has an estimated population of 1,368,723. This region is largely understudied, along with nearby urban centers such as Laredo and Corpus Christi. The Rio Grande Valley and Laredo regions are a concern due to their population growth and heavy cross-border transportation. Data from the Texas Commission of Environmental Quality Continuous Ambient Monitoring Sites was collected from January 1st , 2024, to December 31st, 2024. Statistical analysis, such as …

Inclusive Perspectives In Early Childhood Special Education: Navigating Experiences Of Families And Educators In The South Texas Community, Jessica Ann Garza

Theses and Dissertations

This study examines the relationship between family systems and inclusive outcomes in Early Childhood Special Education (ECSE) programs in South Texas. Guided by Family Systems Theory and the family life cycle perspective, the research explores how family structures, cultural values such as familismo, bilingualism, and cross‑border healthcare access influence educational engagement and student progress. The South Texas region, characterized by its majority Hispanic population, bilingual households, and proximity to the U.S.–Mexico border, presents a unique context for understanding how cultural assets and systemic barriers shape ECSE collaboration. Using a convergent parallel mixed‑methods design, the study integrates quantitative survey data on …

Essays On Ai-Driven Analytics For Enhanced Healthcare Delivery: From Onset To Outcomes In Neurological Diseases Management, Gabriel Owusu

Theses and Dissertations

Chronic neurological diseases, particularly Alzheimer's disease and related dementias (ADRDs), pose mounting global healthcare burdens. Despite advances in AI and health information technologies, early detection, precise diagnosis, and effective caregiver support remain elusive. This dissertation proposes innovative AI-enabled analytical frameworks to address these challenges across the full ADRD continuum.

The first essay designs an explainable AI-enabled clinical decision support system (CDSS) using a graph neural network for early AD identification, evaluated through usability studies demonstrating improved risk awareness and clinical engagement. The second essay introduces MADT-RNN, a multi-level attention-based deep transfer recurrent neural network that fuses convolutional and recurrent architectures …

The Effects Of Ai Adoption On Digital Entrepreneurial Intention: A Meta-Analysis, Xandra Precious Okori

Theses and Dissertations

AI adoption and its widespread use have sparked debates about the future of work, job displacement, and the evolving entrepreneurial landscape. While AI is often seen as a threat to traditional employment, research shows that this emerging technology is more likely to change task structures rather than eliminate entire occupations or industries. This shows that there are new entrepreneurial opportunities, particularly digital, that potential entrepreneurs can venture into. This thesis uses a meta-analytic approach to study the relationship between AI adoption and digital entrepreneurial intention, addressing inconsistencies in current research.

Following PRISMA guidelines, a comprehensive search was conducted across Web …

The Effect Of Drought On Avian Migratory Patterns And Stopover Through Texas And Louisiana, Ian Becker

Theses and Dissertations

Extreme weather events pose a massive threat for native ecosystems. As precipitation and temperature patterns are altered due to climate change, drought may become an incredibly severe event on the landscape. Drought directly impacts resources that migratory birds need during stopover en route to breeding and non-breeding grounds. Here, I quantify the impacts of drought on migration through Texas and Louisiana using 26 years of weather surveillance radar data. To understand how drought interacts with the local environment to impact migration, I tested 4 hypotheses displaying drought’s ability to impact migrants in conjunction with climatic and habitat level characteristics. Fall …

Vision-Based Vibration Monitoring Of Civil Structural Damage Detection Using A Low-Cost Autonomous Uav, Javier Antonio Becerril

Theses and Dissertations

This thesis presents the development and experimental validation of a low-cost autonomous unmanned aerial vehicle (UAV) for non-contact vibration-based structural damage detection. We extract structural vibration signals directly from video recordings captured by the onboard camera during flight. The extracted vibration signals are analyzed in the frequency domain to identify natural frequency shifts associated with structural degradation and damage.

To evaluate the effectiveness of the proposed approach, a laboratory-scale steel frame structure is tested under both healthy and simulated damage conditions. In contrast to advanced commercial UAV inspection systems, the developed UAV achieves comparable inspection capability at a significantly lower …

Developing A Qpcr Method For Evaluating Parasitoid Wasps As A Potential Means Of Control Of The Southern Cattle Fever Tick Rhipicephalus (Boophilus) Microplus In South Texas, Abbey Abalos

Theses and Dissertations

Ixodiphagus spp. wasps are natural enemies of ticks that have been reported to cause mortality in multiple tick species. Parasitoid wasps may represent a potential biocontrol alternative to traditional chemical tick control methods, which are challenged by non-target toxicity and the development of pesticide resistance in species of concern such as Rhipicephalus microplus, a pest of livestock that causes billions of dollars in loss to the livestock industry worldwide. Rhipicephalus sanguineus s.l. is a congeneric species of R. microplus, and parasitism of R. sanguineus by Ixodiphagus sp. in areas of co-occurrence has been observed. It is unknown if R. microplus …

Academic Anxiety, Anxiety Sensitivity, And General Mental Health In Collegiate Student-Athletes, Finley Gabrielle Elkins Sims

Theses and Dissertations

Collegiate athletes’ mental health is on the decline, and they have unique experiences that can influence the prevalence of mental health struggles. This study examined academic anxiety, comorbid forms of anxiety, and predicting factors in 187 collegiate student-athletes across 29 U.S. colleges. Athletes had significantly higher levels of academic anxiety and general anxiety compared to a college nonathlete population. There were significant gender differences in athletes, with females having greater levels of anxiety sensitivity, academic anxiety, sport anxiety, general anxiety, depression, and a history of depression than male athletes. Gender, history of depression, anxiety sensitivity, and depression were significant predictors …

Pesticides And Poverty: How Socioeconomic Factors Relate To Pesticide Application In The Continental Us, Reed Smetter

Theses and Dissertations

Pesticides are often used to help reduce the populations of weeds, insects, and pathogens in agricultural and urban settings, reducing the risk of outbreaks and losses of agricultural yield. The communities that surround agricultural areas often bear the brunt of the negative community and environmental health effects of these chemicals, and are frequently rural, poor, and lack critical infrastructure resources. Pesticide application volumes are often linked closely with specific health effects. In this study, I apply social vulnerability theory to compare the potential connections between the application rates of pesticides and socioeconomic variables across the United States using a nationwide …

Intersecting Identities, Social Support, Multiple-Minority Stress, And Health Outcomes Among Latinx Lgbtq+ Adults, Amanda Lamas

Theses and Dissertations

Latinx LGBTQ+ adults experience poor health due to exposure to intersectional discrimination; however, they also possess protective factors to cope with these stressors. This study explored the associations and interactions of identity affirmation (ethnic, American, LGBTQ+), identity outness, perceived social support, LGBT-POC microaggressions, and health among LGBTQ+ Latinx adults. Correlational analyses and regression models controlling for covariates showed that American and ethnic identity affirmation, perceived social support, and identity outness were positively associated with health, and LGBT-POC microaggressions were negatively associated with health. LGBTQ+ identity affirmation was directly correlated with mental health, but not in the regression model. Identity affirmation …

The Impact Of Nutrition On Insecticide Resistance And Gene Expression In Aedes Aegypti, Esmeralda Guadalupe Rosas

Theses and Dissertations

The development of insecticide resistance in Aedes aegypti, a major vector of dengue and Zika viruses, threatens vector control efforts, particularly in endemic regions such as South Texas. Insecticides remain widely used; however, their overuse has accelerated metabolic resistance mediated by cytochrome P450 enzymes. Environmental factors such as larval nutrition may influence mosquito physiology and resistance-associated gene expression, yet this relationship remains poorly understood. This study examines how larval nutritional conditions affect the expression of cytochrome P450 genes linked to pyrethroid resistance in Aedes aegypti. Larvae were reared under five dietary treatments differing in lipid and protein ratios, and adults …

The Role Of Operational Context In Shaping Energy Management Portfolios: A Comparative Case Study Of Two Manufacturing Facilities, Cynthia Aranda

Theses and Dissertations

Using two facilities as illustrative examples, this research investigates how a manufacturing plant's operational and financial context may influence its investment decisions in energy-efficiency measures. This challenges the primacy of the simple payback period (SPP) as a screening tool and instead demonstrates the role of operational context in investment decision-making. To this extent, this study is anchored to a qualitative comparative case study analysis of two ITAC energy assessments for two manufacturing plants in Texas: a higher value-added aerospace MRO plant (GE Aerospace, TR0060) versus a cost-sensitive automotive stamping plant (UMP Metal Stamping, TR0061). The two cases illustrate two different …

Spatiotemporal Evolution Of Flow Decline And Water Consumption In A Highly Regulated Transboundary River: The Lower Rio Grande/Bravo, Ana Yarely Casillas Rodriguez

Theses and Dissertations

Long-term flow variability in transboundary rivers reflects the combined influence of water availability, infrastructure development, and binational water use. Integrating historical discharge with evolving water-use data remains challenging due to fragmented records and nationally bounded assessments. This study reconstructs a 125-year discharge record (1900–2025) from historical Water Bulletins and modern observations at 12 gauging stations, providing a spatiotemporal assessment of flow evolution and water-budget components in the Lower Rio Grande/Bravo (LRG).

Discharge records were grouped into four hydrologic regimes—natural (1900–1913), pre-dam (1935–1950), post-dam (1974–1989), and modern (2010–2025)—and analyzed alongside binational water-use data across major sectors. A basin-scale water budget, using …