Comparative Biomechanics: Blattodea Antennal Morphology And Physiology, Lucas W. Marsh

All Theses

Equipped with muscle-free antennae, many insects can twist and bend their antennae on demand. We hypothesized that hemolymph circulating through the antennae provides pressure that facilitates twisting and bending and provides a feedback control channel for tactile sensing in insects. To test this hypothesis, we conducted a thorough morphological and physiological analysis of antennae in three Clades of Blattodea. We studied morphology by evaluating the distinguishable features of the body and antenna, as well as the internal structure of the antennal lumen. Then, in a series of experiments on live cockroaches, we measured blood pressure along the antenna. This was …

Scrolling For Support: Social Media Use, Health Information Seeking, And Social Support In Individuals With Type 1 Diabetes, Loren Myers

All Theses

Type 1 diabetes (T1D) is a lifelong chronic illness that is rapidly increasing in prevalence. Continuous treatment is necessary for proper management, but barriers to care can cause some to turn to other sources for health-related information, like social media. Given the limited research on social media use and health information seeking behaviors in people with T1D, this study aims to gain an understanding of how people with T1D use social media, where they get their health information, and how social support is related to social media behaviors among people with T1D. Adult T1D participants completed an online survey that …

Anxiety And Intuitive Eating: Examining Dispositional Mindfulness As A Protective Factor, Jordan Signorelli

All Theses

Intuitive eating (IE) is an anti-diet approach focused on listening to internal hunger and fullness cues and is associated with reduced disordered eating patterns and improved dietary intake. However, anxiety negatively impacts IE. Dispositional mindfulness (DM) – one’s innate, present-centered, nonjudgmental awareness of thoughts, emotions, and bodily sensations – is associated with lower anxiety and greater IE. Yet, whether DM mitigates the negative impact of anxiety on IE remains underexplored. Grounded in the Cognitive Behavioral Therapy Framework, this study aimed to: 1) examine the relationship between anxiety and IE, 2) examine the relationship between DM and IE, 3) examine whether …

I Am The Perfect Wife: The Bildungsroman And The Disruption Of The System In Jane Eyre And The Hunger Games, Carolyn Carpenter

All Theses

None.

Stochastic Universal Differential Equations For Epidemiological Modeling: Uncertainty Quantification In Disease Transmission Dynamics, Alice Menaya Armah-Bonney

Electronic Theses and Dissertations

Epidemic forecasting requires not only predictions of expected case counts, but also quantification of uncertainty, although existing surrogate modeling frameworks for agent-based models remain fundamentally deterministic. In this thesis a Stochastic Universal Differential Equation framework is presented that extends the deterministic Universal Differential Equation approach by incorporating a learnable stochastic diffusion term, enabling calibrated probabilistic forecasts while preserving the mechanistic interpretability and computational efficiency of the deterministic baseline. In doing so, a two-phase training algorithm is introduced to ensure stable convergence and the framework is validated against the ensemble output from ExaEpi, an exascale agent-based model of a COVID-19 outbreak …

University Student Mental Health: Service Utilization, Equity Gaps, And Strategies To Improve Access, Richard Mutua Kilonzo

Electronic Theses and Dissertations

Student mental health and access to care are pressing concerns in higher education. This study assesses mental health outcomes and access to campus mental health services at East Tennessee State University. Survey data from the 2023–2024 Healthy Minds Study were analyzed to report the prevalence of depression, anxiety, and suicidal ideation across the student population. The study evaluates disparities in these outcomes and barriers to care across student groups, with particular attention to equity-impacted students, especially sexual and gender minority students.

Findings indicate widespread psychological distress alongside persistent barriers, including long wait times, limited-service availability, and stigma-related concerns. These barriers …

Bergsonian Blend: Subjective Temporality Within Modernist Aesthetics Of Mental Illness, Lydia Victoria Gervais

Electronic Theses and Dissertations

Henri Bergson was a modernist French philosopher who wrote extensively on the topic of the lived experience of time, which he called durée, or duration. His contemporary, Sigmund Freud, was developing psychoanalytic theory in a growing field of psychological study, which serves as a prominent ancestor to modern psychiatry and current psychoanalytical literary studies. Fiction writers of the 1900s absorbed the zeitgeist of melded chronology and consciousness, interweaving themes of time and trauma in their works. Utilizing Henri Bergson’s durée as a philosophical framework, I examine the moralization of time-consciousness in connection with mental illness and investigate representations of …

Malnutrition And Frailty Risk Among Community Dwelling Older Adults In Northeast Tennessee, Shreeyesha Pradhan

Electronic Theses and Dissertations

Frailty and malnutrition are prevalent conditions among community-dwelling older adults, affecting approximately 10% and 25% of this population, respectively. Despite overlapping symptoms such as functional decline, their relationship remains underexplored in community dwelling older adults. This cross-sectional feasibility study examined the association between frailty and nutritional status among 47 older adults in the East Tennessee Tri-Cities area using the Fried’s Frailty Phenotype (FFP) and the Mini Nutritional Assessment-Long Form (MNA-LF®). Results indicated 13% were pre-frail, 24% were frail, 21% were at risk for malnutrition, and 2% were malnourished. Regression analyses revealed that self-perceived nutritional status (37.6%), daily meal frequency (29.0%), …

Addressing Substance Use Disorder In Rural Appalachia: Improving Access And Treatment Outcomes For Justice-Involved Individuals, Jessica Muldowney

Electronic Theses and Dissertations

Background: Opioid use disorder (OUD) represents a critical public health crisis disproportionately affecting justice-involved (JI) populations, with approximately 65% of incarcerated individuals having substance use disorders (James & Beatty, 2006). Rural Appalachian communities face compounded challenges due to limited healthcare access, provider shortages, and cultural stigma surrounding addiction treatment. Despite evidence demonstrating that medication-assisted treatment (MAT) reduces recidivism and overdose deaths, only 20% of correctional facilities offer these services (Klein & Seppala, 2019).

Objective: This mixed-methods study evaluated organizational readiness and infrastructure capacity for implementing evidence-based OUD interventions, specifically MAT programs across three rural counties in northwestern North Carolina.

Methods: …

Feasibility Of Assessing Dietary Patterns And Anxiety In College Students: A Pilot Study Using Nutrition Questionnaires, Gad-7, And Asq, Kylie Ford

Electronic Theses and Dissertations

Anxiety is highly prevalent among college students representing a significant public health concern. Research indicates that dietary patterns may influence mental health outcomes; however, the practicality of collecting comprehensive dietary and psychological data in college populations remains unclear. This pilot study assessed the feasibility of evaluating dietary patterns and anxiety using self-report instruments. Participants completed the Nutrition and Eating Habit questionnaire, the Generalized Anxiety Disorder-7 (GAD-7), and the Anxiety Sensitivity Questionnaire (ASQ). Although twenty-one students were recruited, survey completion rates were low, with only seven participants completing the nutrition questionnaire necessary to calculate the Dietary Inflammatory Index (DII). Descriptive analyses …

Ontogeny And The Effects Of Perinatal Stress In The First Immature Skeleton Of Teleoceras Aepysoma (Perissodactyla, Rhinocerotidae), Joe Gajewski

Electronic Theses and Dissertations

Recovery of an immature fossil rhinoceros (Teleoceras aepysoma) skeleton (ETMNH 32999) from the Gray Fossil Site in Tennessee offers the first insights into the ontogeny of the species. ETMNH 32999 is interpreted to be a subadult male in an age class equivalent to ~17-20% of potential lifespan. Comparative analyses support the hypothesis that subadults of related taxa are typically ~91% of average adult size in most dimensions. However, certain cranial dimensions are substantially lower than expected in ETMNH 32999, averaging only ~74% of the average conspecific adult. Such departure from typical growth rates is suggested to be attributable …

Utilizing Physics Informed Neural Networks For Disrupted Signal Dynamics, Nicholas J. Joyner

Electronic Theses and Dissertations

Physics-informed neural networks (PINNs) have been used in many applications including engineering and physical sciences. PINNs allow the incorporation of a priori understanding of a process’ structure into the modeling. We attempt to leverage the PINN structure toward the evaluation of disruptions to classical dynamical models by combining elements of ordinary differential equations into our loss function with sigmoidal gating to balance the penalties for deviations from the data with those for structural deviations. This enables the identification of the signal structure and the limits of disruption influence. As a use case, we consider stock value from 2019-2021, which expresses …

Undergraduate Design Spine For Biological Systems Engineering And Agricultural Engineering, David Mabie, Derek M. Heeren, Deepak R. Keshwani, Heidi A. Diefes-Dux, Nicole M. Iverson, Rachel Padrnos, Greg Bashford, Taryn King, Jenna Hefley, Curtis L. Tomasevicz

Department of Agricultural and Biological Systems Engineering: Presentations and White Papers

Engineering education is undergoing a shift toward preparing graduates with demonstrated capabilities that integrate technical knowledge, durable skills, and the ability to adapt in a rapidly evolving professional landscape. This paper describes a comprehensive redesign of the undergraduate curriculum in Biological Systems Engineering (BSEN) and Agricultural Engineering (AGEN) at the University of Nebraska–Lincoln. The redesign is grounded in a “Design Spine” framework, which distributes and scaffolds design experiences across all four years of the program to support progressive development of problem solving, systems thinking, communication, and professional skills. The curriculum is organized around clearly defined capabilities and threads that connect …

Assessment Of Super Absorbent Polymer In Soybean Cultivation Under Variable Irrigation Conditions In Nebraska, Ankit Chandra, Abia Katimbo, Ronaldo Marchezan, Martha Nabaggala

Department of Agricultural and Biological Systems Engineering: Presentations and White Papers

Water limitation is a primary constraint to soybean productivity in both irrigated and rainfed systems. Soil-applied superabsorbent polymers (SAPs) have been proposed as a strategy to buffer crops against episodic drought stress; however, their physiological and agronomic performance under varying irrigation regimes remains insufficiently quantified. Here, we evaluate three biodegradable polymer formulations: broader granules (BB), original granules (OG), and powder (PWR) applied at low (17.7 lb/ac) and high (120 lb/ac) rates under full (100% ET), reduced (50% ET), and no irrigation conditions in western Nebraska. Polymer application had negligible effects under full irrigation, with yields comparable to untreated controls. Under …

Structured Representation Learning For Generalizable Deepfake Video Detection, Maowen Tang

All Theses

Deepfake video detection has become an important problem in multimedia forensics as modern generative models produce increasingly realistic facial manipulations. Although many existing detectors achieve strong performance on the datasets on which they are trained, their performance often degrades substantially on unseen manipulation methods and evaluation conditions. A major reason for this limitation is the premature collapse of spatial structure: many vision transformer based detectors aggregate patch tokens into a single global representation, thereby suppressing the localized and temporally uneven forensic cues that characterize manipulated video.

This thesis presents the Spatio-Temporal Slot Aggregation Network (ST-SAN), a video-level deepfake detection framework …

Uncertainty, Information, And Major Choice: Evidence From Chinese Gaokao, Sikun Dou

Dissertations and Theses Collection (Open Access)

An unresolved background risk makes people more averse to other, independent  risks—most of all when a high-stakes, irreversible choice must be made under that risk. College major choice is such a setting. In China, students are admitted directly into a major they cannot easily change, and in the early 2000s they had to commit before learning their exam scores, bearing a field’s academic risk on top of an unresolved admission risk. Because STEM fields carry more academic risk and women are on average more risk-averse, this burden falls hardest on women’s entry into STEM. Exploiting a reform that moved application …

Metabolic And Replicative Constraints On Pathogen Virulence: Isoleucine Catabolism In Shigella And Comparative Tanapoxvirus Replication In Cell Cultures, Benecia Angelica

Masters Theses

Pathogens survive by balancing metabolic demands with environmental challenges that shape their virulence and adaptability. Shigella flexneri, a highly infectious human pathogen responsible for severe diarrheal disease worldwide, utilizes branched-chain amino acid (BCAA) metabolism to withstand stress conditions encountered within the host environment. In this study, we explored the Shigella isoleucine catabolism pathway by knocking out four genes in the S. flexneri isoleucine catabolic pathway (ilvE, fadA, fadD, and acnB) and examining their metabolism and virulence. We found that the ilvE and acnB mutants displayed reduced metabolic activity and smaller plaque size, while the fadD mutant showed decreased invasion. In …

Changing Dynamics Of Microbial Communities At A Hydrocarbon Contaminated Site And Methanogenic Interactions With Iron Minerals, Jakob Sell

Masters Theses

Microbial life is not only ubiquitous but also plays a critical role in the geochemical makeup of our planet. While researchers have long studied easily culturable aerobic microbes, the influence of anaerobic life on soils and mineral cycling is less understood. Notably, knowledge about interactions between anaerobic microbes and inorganic elements such as iron has progressed with the discovery that magnetite influences how anaerobic archaea carry out methanogenesis. To better understand anaerobic bacterial metabolisms and how they interact with minerals and subsurface hydrocarbons, we extracted 16S rRNA genes from two adjacent subsurface petroleum plumes, sequenced the DNA, and analyzed it …

Quantifying Discard Mortality Of Undersized And Ovigerous Crabs In The Gulf Of Mexico Blue Crab Fishery, Micayla Cochran

Master's Theses

Blue crabs support a valuable commercial fishery in the Gulf of Mexico. Most states require the release of undersized and ovigerous blue crabs, yet mortality of these discarded crabs is an understudied component of total mortality. The first objective of this project was to quantify discard mortality of non-target crabs using bycatch surveys across the Lake Pontchartrain–Mississippi Sound coastal system. Ovigerous crabs were most common at high salinities and temperatures, whereas undersized crab presence was inversely correlated with soak time, temperature, and the number of crabs per trap, and also varied among geographic locations. A reflex action mortality prediction assessment …

Discerning Patterns Of Floral Sugar-Feeding: Dynamics Of The Mosquito Culex Antillummagnorum In Puerto Rico, Ella J. Branham

Master's Theses

Mosquitoes rely on sugar feeding for survival, primarily from flowering plants, yet mosquito–plant interactions remain understudied. I examined plant-feeding associations of the mosquito Culex antillummagnorum in the Luquillo Experimental Forest of Puerto Rico, which may clarify patterns of habitat use, disease dynamics, and broader species interactions. First, plant DNA was extracted from field-collected Cx. antillummagnorum to identify potential nectar sources. DNA barcoding produced positive matches to the flowering plant genera Billia, Aesculus, Cladium, Fimbristylis, Xyris, Cakile, and Habenaria. Habenaria was the most compelling result because it belongs to the same subtribe of orchids …

Psychological And Inflammatory Ties To Diet In Breast Cancer Survivors, Sonal Kaur Johal

Master's Theses

Breast cancer is among the most prevalent forms of cancer and is a primary cause of death among women (Wang et al., 2020). Cancer patients experience higher levels of anxiety symptoms, depressive symptoms, and inflammation compared to non-cancer patients, which can predict a diminished quality of life but also contribute to higher mortality rates among cancer patients (Bortolato et al., 2016; Song et al., 2022). Diet has the potential to impact the manifestation of depressive and anxiety symptoms in both healthy individuals and those battling cancer. This study explored the association between dietary habits, specifically cholesterol, fiber, saturated fat, added …

Explaining The Gap: The Mediating Effect Of Basic Psychological Need Satisfaction On Parenting Styles And Disordered Eating Behaviors, Oliva Dixon

Master's Theses

Eating disorders remain one of the fastest growing and most fatal forms of mental health disorders. It is estimated that around 9% of the US population meets diagnostic criteria for an eating disorder; however, a much larger percentage of the population engages in disordered eating behaviors, putting people at risk for negative consequences both physically and psychologically. While there are several theories about what precipitates disordered eating, parenting has been shown to be a key factor that can influence disordered eating behaviors. While some theories implicate authoritarian parenting, others consider psychological control or permissive parenting as potentially associated with the …

Cannabinoid Modulation Of Metabolic Dysfunction Associated Steatotic Liver Disease In A Mouse Model, Kira Villarreal

Undergraduate Honors Theses

The liver plays an essential role in regulating metabolism. Though, when the physiology of the liver is thrown off, this can lead to pathological states. Metabolic dysfunction associated steatotic liver disease (MASLD) can be a consequence of irregular physiological state in relation to metabolism. MASLD is the leading chronic liver disease globally with estimated 30% of patients affected, and incidence rates expected to rise. MASLD is diagnosed when there is a >5% build up of lipids in the hepatocytes and is not associated with high alcohol consumption. There are many risk factors associated with MASLD, such as high fat or …

The Role Of Art-Based Pre-Performance Rituals For Collegiate Student-Athletes And Their Perceived Effects On Mental Preparation, Haylee P. Robinson

Undergraduate Honors Theses

This paper will explore whether collegiate student-athletes at the University of Northern Colorado (UNCO) engage with art-based pre-performance rituals (PPRs) and, if so, examine their perceived effects on mental preparation prior to competition. Research has discussed traditional preparatory routines (PRs)—breathing techniques, visualization, goal setting, and problem-solving—creating a gap for understanding how creative or symbolic rituals function in the realm of collegiate sports. Combining Clifford Geertz's (1973) anthropological framework of ritualized behaviors acting as “meaning-making systems” with empirical evidence supporting art therapy, this research positions symbolic art-based interventions as PPRs, helping athletes with focus, emotional regulation, and confidence prior to competition. …

Wrky Transcription Factors: Integral Regulators Of Defence Responses To Biotic Stress In Crops, Dongjiao Wang, Ruize Zhang, Wenhui Zou, Yuanyuan Zhang, Wanying Zhao, Tingting Sun, Qibin Wu, Zheng Qing Fu, Youxiong Que

Faculty Publications

Crops are continually challenged by biotic stresses, including fungal, bacterial and viral pathogens and insect pests, which cause substantial yield and quality losses worldwide. WRKY transcription factors constitute a plant-specific and functionally diverse family that is central to immune regulation. Recent advances in genomic resources and multi-omics approaches have accelerated the identification and functional characterisation of WRKYs in crops. This review summarises the structural features and classification of WRKY genes and their genome-wide distribution across crop species. It also synthesises WRKY-centred regulatory modules that mediate resistance to major classes of biotic stress. In antifungal defence, WRKYs reinforce pattern- and effector-triggered …

Sleep Disturbances In Parkinson’S Patients With A History Of Head Injury, Melissa N. Pacheco

Electronic Theses, Projects, and Dissertations

Sleep disturbances are among the most prevalent and burdensome non-motor symptoms of Parkinson’s disease (PD), yet the contribution of prior traumatic brain injury (TBI) to these problems remains poorly understood. The purpose of this study was to examine whether the number and severity of lifetime head injuries predicted sleep disturbances in individuals with PD. Data from 3,055 PD patients enrolled in the Fox Insight study were analyzed, including 1,593 with a history of head injury. Participants completed self-report questionnaires assessing head injury history, motor and cognitive symptoms, and sleep disturbances. Generalized linear mixed models tested whether head injury history and …

Ableism In Higher Education: Platicas Framing Faculty Perception Of Student Accommodations And A Call To Action, Stephanie P. Rivas

Electronic Theses, Projects, and Dissertations

Academic ableism and traditional educational practices hinder the success of disabled students (Dolmage, 2017). As a student with disabilities, I have witnessed gradual improvements in the perception of disabilities in education. However, academic ableism persists in today’s higher education institutions, which can be disheartening for students like me, an unapologetically disabled person. This study employs framing theory, a communication theory that explains how people interpret and organize information (Goffman, 1947). These frames influence how accommodations are perceived, shaping attributes and connections between behaviors and potential causes (Tewksbury & Scheufele, 2019). Using platicas, a kind of cultural method of open conversational …

Impact Of Affirmative Care For Lgbtqsia2+ Youth In Foster Care, Jody Brown

Electronic Theses, Projects, and Dissertations

One of the major challenges within the child welfare system is that LGBTQSIA2+ youth often face discrimination, stigma and have limited access to mental health services. Although previous research has identified LGBTQSIA2+ youth being overrepresented in foster care, they face distinctive vulnerabilities that are inadequately addressed in present policies within child welfare practices. Despite experiencing higher levels of placement instability and being at greater risk of anxiety, depression and psychological distress, there remain gaps in tangible support and evaluating the effectiveness of intersectionality of lived experiences of LGBTQSIA2+ youth in the foster care. The purpose of this qualitative phenomenological research …

Beyond The System: A Critical Analysis Of Child Welfare Placement Practices For Children With Autism, Lauren Scott, Nicole Navarro

Electronic Theses, Projects, and Dissertations

Autism Spectrum Disorder (ASD) is a neurological condition that affects an individual’s communication, social interactions, and behavior. Approximately 1.7% of children in the United States are diagnosed with ASD. Families raising children with ASD face significant challenges, including limited support systems, caregiver fatigue, and financial strain. These difficulties increase the likelihood of maltreatment, leading to higher rates of children with ASD being referred to Child Welfare Agencies. Once involved in the system, children with ASD often encounter difficulties in finding appropriate long-term foster or kinship placements, which can result in high rates of placement instability. This research seeks to identify …

Discipleship Includes Both Acceptance And Change, Steve Case

Journal of Adventist Youth and Young Adult Ministries

Discipleship—following Jesus—includes both acceptance and change. Acceptance from Christ transforms the orientation of humans to follow the God who initiates and completes our acceptance. But discipleship also involves change—sometimes radical and sometimes gradual. The transformation that began with acceptance continues with change. An emphasis of one over the other, or worse, ignoring or denying one of these two dynamics, results in a skewed discipleship. Both acceptance and change remain supernatural actions in the God-human relationship of discipleship.