Medicine and Health Sciences Commons^™

Effects Of Cross-Sex Hormone Therapy (Csht) On Aortic Reactivity And Metabolic Parameters In Gonadectomized Male And Female Rats, Rifat Ara Islam

University of the Pacific Theses and Dissertations

With the rising awareness, the number of individuals identifying themselves as transgender in the US is increasing over the years. Cross-sex hormone therapy (CSHT) may alter cardiometabolic parameters leading to the increased risk of cardiovascular diseases (CVD) in transgender population. However, the underlying mechanisms of impaired cardiovascular functions in transgender female (male to female, MtF) or transgender male (female to male, FtM) individuals are not well documented. This study was undertaken to examine the effects of 17β-estradiol (E2)- and testosterone propionate (Tes)-treatment on key cardiometabolic parameters and aortic reactivity in castrated (CAS) male and ovariectomized (OVX) female Sprague Dawley (SD) …

Correlates Of Gacha Gaming, Minh Quang Nguyen

Graduate Theses/Dissertations

The purpose of this study was to explore the relationship between impulsive measures, income spending on gaming, and delayed discounting in a Gatha player sample. Two model approaches were employed: (1) a mediation model approach predicting delayed discounting with age and education level as mediators and (2) a multiple regression model predicting delayed discounting. Although the proposed models were exploratory, it was the contention of the author that these analyses would result in a better understanding of delayed discounting in Gacha gaming. Both age and education level were not correlated with the dependent variable (spending ratio), therefore the mediation model …

The Effect Of Hypochlorous Acid On Cultured Osteoblast And Escherichia Coli, Cristina Flaquer Fusté

Graduate Theses/Dissertations

Hypochlorous acid (HOCl), a naturally occurring compound in neutrophils, has been used as an antimicrobial in wound treatment. Osteoblasts, bone-forming cells, within the bone tissue play a large role in bone fracture healing. Orthopedic infections are challenging to treat and highly morbid, including surgical site infection of arthroplasty procedures or infection in the setting of compound fractures. HOCl is being considered as a surgical antiseptic to decrease infections in orthopedic surgical procedures. This study therefore seeks to determine the effects of HOCl on osteoblasts and E. coli. Cultured osteoblasts were incubated with varying concentrations of HOCl to examine osteoblast …

Characterization Of The Overexpression Of Reca Homologs Rad51 And Dmc1 In Tetrahymena Thermophila, Jianna M. Cox

Graduate Theses/Dissertations

RecA homologs, Dmc1 and Rad51, work to repair DNA double-strand breaks (DSBs) within the cell through the recombination of homologous sections of DNA. Dmc1 works to repair programmed DSBs through meiotic recombination, while Rad51 functions to repair both meiotic and non-meiotic DSBs, the latter repaired through the process of homologous recombination repair (HHR). Chemotherapeutics, exogenous agents, work to form DSBs in cancer cells, attempting to inhibit the cell’s growth. A hyper recombinant phenotype is often seen in cancer cells due to the overexpression of RAD51, leading to drug resistance, the persistence of cancers, and an overall poor patient outcome. …

Aestheticizing And Engendering Disease: The Case Of Tuberculosis, Abigail Dollries

Dartmouth College Master’s Theses

This thesis examines how tuberculosis, known in the nineteenth century as “consumption,” was aestheticized in American cultural and medical discourse, particularly in industrial cities of the North between 1830 and 1850. It addresses the paradox at the heart of the disease’s representation: while tuberculosis was medically pathologized, it was simultaneously romanticized, especially when afflicting elite white women. The central problem explored is how this aestheticization of illness functioned to reinforce gender, class, and racial hierarchies by transforming suffering into a symbol of virtue, refinement, and social status. Using a cultural-historical methodology, this project analyzes a range of sources, including medical …

Wear Resistance Of 3d Printed Occlusal Splint Materials, Pierpont Flanders Brown

All ETDs from UAB

Statement of problem: Three-dimensional (3D) printing offers an efficient method to produce occlusal devices (splints). However, their wear resistance is poorly understood. Purpose: The purpose of this in vitro study was to compare the wear resistance of flexible and rigid 3D printed occlusal splint materials to milled and conventionally processed occlusal splint materials. By establishing such a comparison, this study will help provide clinicians with greater knowledge of which materials and methods will provide their patients with the most wear resistant and durable occlusal splint possible. Material and methods: Identical sized blocks (n=8) of 3 flexible 3D printed materials (KeySplint …

Reelin Regulation Of Striatal Physiology And Cocaine Reward, Kasey Lynn Brida

All ETDs from UAB

Drugs of abuse activate defined neuronal populations in brain reward structures such as the nucleus accumbens (NAc), which are thought to promote the enduring synaptic, circuit, and behavioral consequences of drug exposure. While the molecular and cellular effects arising from experience with drugs like cocaine are increasingly well understood, the mechanisms that sculpt NAc neuron participation are largely unknown. Here, we leveraged unbiased single-nucleus transcriptional profiling to identify expression of the secreted glycoprotein Reelin (encoded by the Reln gene) as a marker of cocaine-activated neurons within the rat NAc. Multiplexed in situ detection confirmed selective expression of the immediate early …

Platal Expansion Using The Invisalign Palatal Expander "Ipe", Hassan Chihab

All ETDs from UAB

Palatal expansion has been used in orthodontics to treat a narrow maxilla and to primarily correct posterior dental crossbites. In younger patients, palatal expansion can readily be achieved through opening of the mid-palatal suture, as it is not fused at that age. As the mid-palatal suture matures, expansion will gradually be difficult to achieve, and more dental expansion is obtained rather than skeletal. In addition, there is a tendency to get more dental tipping. Palatal expansion has been recommended not only to correct crossbites but also to improve breathing in patients with sleep disorders such as obstructive sleep apnea (OSA). …

Co-Creating A Social, Emotional, And Mental Health Well-Being Group For College Students With Disabilities And/Or Chronic Health Conditions And Are Registered With Disability Support Services, Consuelo A. Click Copeland

All ETDs from UAB

ABSTRACT Nearly one in four adults in the United States report living with a disability (Centers for Disease Control and Prevention, 2024). According to the National Center for Educational Statistics (2023), approximately 21 percent of undergraduate students and 11 percent of postbaccalaureate students report having a disability. Students with disabilities in college encounter considerable obstacles that can adversely affect their mental health, academic performance, and general well-being. These obstacles encompass social isolation, stigma, and insufficient personalized support services, resulting in increased levels of anxiety, depression, and dropout rates compared to students without disabilities. Despite the critical need, there is a …

Occupational Exposure To Cooking Emissions And Evaluation Of Ventilation System In Restaurant Kitchens, Matthew Kaleb Hanvey

All ETDs from UAB

Background: In the restaurant environment, there are many harmful contaminants generated during the cooking process that kitchen workers are potentially exposed to. The purposes of this study were to evaluate the potential exposure to aldehydes and respirable particles among restaurant kitchen workers and to examine the ventilation performance of the kitchen exhaust hoods. Methods: There were three restaurants recruited for this study and they cooked seafood/poultry (Restaurant 1), farm style foods (Restaurant 2), and finger foods (Restaurant 3). The three restaurants had wall-mounted canopy hoods. Restaurant 1 had two hoods, Restaurant 2 had two hoods, and Restaurant 3 had one …

Everyday Decision-Making Involvement Among Hispanic & Latinx Dementia Caregivers And Its Associations With Daily Anxiety And Daily Depressive Symptoms, Abigail Poe

All ETDs from UAB

Background: Hispanic and Latinx (H&L) caregivers of individuals living with Alzheimer’s disease and related dementias (ADRD) experience elevated caregiving burden and poorer mental health outcomes compared to caregivers from other racial and ethnic groups. Limited research has examined H&L caregivers’ involvement in everyday decision-making for persons living with dementia (PLWD), particularly how this involvement may relate to daily mental health symptoms such as anxiety and depression. Purpose: This study examined baseline decision-making involvement (DMI), its associations with individual-level factors, and its relationship with daily anxiety and depressive symptoms in H&L ADRD caregivers. Methods: A secondary analysis was conducted using data …

Prevalence Of Meibomian Gland Dysfunction In A Young Adult Population, Tyler Thomas

All ETDs from UAB

Background Meibomian gland dysfunction (MGD) varies in prevalence depending on the demographic and can significantly impact quality of life. There is a lack of research on MGD in young adult, professional student populations. Professional students often experience high levels of stress, reduced sleep, and increased electronic device use, which may elevate their risk for developing MGD. Specific Aims This cross-sectional clinical analysis has two specific aims: (1) to determine the prevalence of MGD in a young adult, professional student population, and (2) to identify potential risk factors and clinical assessments correlated with MGD. Methods A total of 147 professional students …

Learning Dissemination Strategies: Lessons From The Covid-19 Pandemic In Training Healthcare Professionals In Disease Management, Kishan Vishanagra

Honors Undergraduate Theses

The COVID-19 pandemic presented many challenges for global healthcare systems, requiring rapid training and dissemination of disease management strategies among healthcare professionals. This study conducts a systematic review of 37 studies to examine the learning dissemination methods created and utilized during the COVID-19 pandemic, focusing on just-in-time training for disease management. This study identifies four core training topics: airway management, infection control, cardiopulmonary resuscitation, and patient triage. This study also categorizes delivery methods into in-situ simulation-based training, online e-learning platforms, online simulation-based training, and hybrid training models. Findings highlight that simulation-based training methods proved effective for invasive high-risk procedures, while …

Understanding Women's Access To And Utilization Of Syringe Service Programs, Annelisa E. Swiersz

Honors Undergraduate Theses

As of 2020, 138 million Americans ages 12 and over reported illicit drug use in their lifetime, with over 3 million of those people injecting drugs. There are risks for all people who use drugs, but people who inject drugs (PWID) pose specific risks such as hepatitis B, hepatitis C, and human immunodeficiency virus (HIV), with women who inject drugs (WWID) facing even more risks. WWID involved in sex work have a higher risk of HIV transmission and lack access to sterile injection devices and sexual and reproductive health services. To address these risks, syringe service programs (SSPs) were developed …

Comparative Evaluation Of Three Endodontic Rotary File Systems In S-Shaped Root Canals: An In-Depth Analysis, Mudher Bahar

Theses and Dissertations

Objective: This study compares three endodontic file systems—XP‐3D Shaper⁺, EdgeFile X7 and WaveOne Gold in S‐shaped simulated canals in resin blocks. It aimed to quantify canals volumetric changes post‐instrumentation to guide clinical selection of a system that preserves tooth structure while efficiently shaping root canals.

Methods: Thirty S‐shaped canals in resin blocks were divided into three groups (n=10) for instrumentation with XP‐3D Shaper⁺, EdgeFile X7 or WaveOne Gold using the crown‐down technique and manufacturers recommended settings. A no‐treatment control provided a baseline for volumetric changes measured via CBCT scans analyzed with ITK‐SNAP. Data were analyzed using ANOVA and Tukey’s test …

Subgingival Microbiomes Of Healthy And Periodontitis Subjects, Tareq Abdulrasoul

Theses and Dissertations

Background: Periodontitis is a common chronic inflammatory disease triggered by the dysbiosis of the subgingival microbiome. 16s rRNA sequencing has been used to profile the subgingival plaque samples in healthy and periodontitis subjects. Here, we have collected subgingival plaque samples from subjects and analyzed the microbiome profile from 16s rRNA sequencing. We hypothesized that periodontitis patients will have a different subgingival microbiome profile than that of healthy subjects.

Methods: Subgingival plaque samples were collected from periodontitis and healthy subjects who were indicated for periodontal surgeries (osseous resective and regenerative surgery for periodontitis patients or crown lengthening for healthy …

Development Of A Mediation Model Of Pain Cognition In Adult Patients With Sickle Cell Disease, Daniel M. Sop

Theses and Dissertations

Pain is a hallmark of Sickle Cell Disease (SCD), a genetic hemoglobinopathy characterized by chronic hemolytic anemia, vaso-occlusion, and organ damage. While acute vaso-occlusive crises (VOC) have been extensively studied, the mechanisms underlying chronic pain and its interplay with brain function remain unclear. This dissertation investigates the relationships between cerebral blood flow (CBF), fluid cognition, and pain sensitivity in adults with SCD, utilizing advanced imaging techniques and validated assessment tools.

Arterial spin labeling (ASL) and functional magnetic resonance imaging (fMRI) were employed to measure CBF and brain activity, respectively. Pain sensitivity was assessed using the Pain Sensitivity Questionnaire (PSQ), and …

Immersive Medical Practice And Clinical Training: Virtual And Mixed Reality In Pharmacy And Orthopedic Surgery, Silas Semprini De Toledo Contaifer

Theses and Dissertations

Extended‑reality (XR) technologies including virtual reality (VR) and mixed reality (MR) offer new ways to improve training and surgical precision. This thesis evaluates their educational and clinical impact through two complementary studies.

Specific Aim 1 compared an immersive 360° video VR module with conventional training for teaching USP < 797> sterile‑compounding skills to second‑year PharmD students (N = 36). VR trainees raised their knowledge from 6.14 ± 1.55 to 8.69 ± 1.07, yet the overall post‑test advantage versus control was not statistically significant (U = 71.50, p = 0.21). Item‑level McNemar testing showed significant VR‑exclusive gains on three critical questions (K5, K6, …

Hafnium Oxide-Based Nanoheterostructures For Catalytic Radiosensitization And Enhanced X-Ray Radiotherapy, Marlen Dariela Calix Quezada

Theses and Dissertations

Orthovoltage X-ray beams are attractive for surface and intra-operative radiotherapy. Yet, their clinical utility is constrained by rapid attenuation and the limited dose that can be delivered without harming healthy tissue. High-Z hafnium oxide (HfO₂) nanoparticles can boost local energy deposition through the photoelectric effect, while catalytic surface defects accelerate water radiolysis. Harnessing both mechanisms in a single nano-heterostructure could enable potent radiosensitization at diagnostic-range energies.

This thesis develops and evaluates HfO₂-based nanoheterostructures, both bare and Au-decorated, as catalytic radiosensitizers.

Two types of HfO₂ were evaluated, one was synthesized following a specific route and the …

Enhancing Clinical Trial Matching In Molecular Diagnostics: Using Natural Language Processing And Clustering Approaches In Hematological Malignancies, Gillian Fanning

Theses and Dissertations

Clinical trial matching is a critical component of personalized medicine, particularly in the management of hematologic malignancies. At Virginia Commonwealth University (VCU) Health, the Molecular Diagnostics (MDX) Lab produces somatic variant reports and recommends clinical trials based on the presence of clinically significant mutations. However, the current manual trial recommendation process is time-intensive and lacks scalability.

This study introduces a computational framework to streamline and standardize clinical trial matching using natural language processing (NLP) and unsupervised clustering. Trial brief descriptions were analyzed to extract frequent terms, and trials were grouped based on term similarity using joint dimensionality reduction and clustering. …

Rare Variant Analysis Of Electronic Health Record-Defined Major Depressive Disorder In The All Of Us Research Program, Stephen Emil Vieno

Theses and Dissertations

The underlying pathogenesis of MDD remains poorly understood, with multiple competing hypotheses regarding its exact etiology. As a heterogeneous disorder with relatively low heritability, large-scale genome-wide association studies of MDD have relied on increasingly large sample sizes to identify common genetic variants associated with the disorder. However, the rare variant genetic architecture of MDD is still largely unknown. The aim of the present analysis was to use the AoU—a United States-based biobank that integrates healthcare records from over 50 healthcare systems and possesses whole genome sequencing data for participants—to perform a gene set–based analysis of MDD. This analysis presented several …

Modeling Vaccination Strategies And Intervention Impacts On Infectious Disease Dynamics, Elizabeth B. Amona

Theses and Dissertations

This dissertation explores how mathematical and statistical modeling can inform vaccination strategies and evaluate the impact of interventions during infectious disease outbreaks. Motivated by the challenges observed during the COVID-19 pandemic, the research integrates compartmental modeling, Bayesian inference, and agent-based simulation to assess policy effectiveness and disease control across varying contexts. The first study develops a SEIRDV model that incorporates government interventions and vaccination rollout to examine COVID-19 dynamics in Qatar. A Bayesian approach is used to estimate parameters and compute time-varying transmission rates. The model captures shifts in transmission following policy changes and quantifies the reduction in deaths attributable …

Automated Treatment Planning Framework For Cervical Cancer In Brachytherapy, Suman Gautam

Theses and Dissertations

Brachytherapy (BT) is a critical treatment modality for cervical cancer that delivers ionizing radiation directly to the tumor using intracavitary (IC) and/or interstitial (IS) applicators. In high dose-rate (HDR) BT, a remote afterloader guides the radioactive source to specific dwell positions for defined durations, known as dwell times, allowing for a conformal dose to the tumor while minimizing exposure to surrounding organs at risk (OAR). However, due to the inherent nature of ionizing radiation, some dose to OARs is unavoidable, creating a fundamentally conflicting objective in treatment planning: maximizing tumor coverage while minimizing OAR dose. This characterizes the problem as …

Scopolamine-Induced Modulation Of Serotonin And Dopamine Transporters Activity: Behavioral And Molecular Insights Into Rapid Antidepressant Action, Deepak Karunakaran

Theses and Dissertations

Major depressive disorder (MDD) affects over 350 million individuals worldwide and is characterized by profound dysregulation of serotonin (5-HT) and dopamine (DA) systems that govern mood, reward processing, and motivation. The serotonin transporter (SERT) and dopamine transporter (DAT), both dynamically regulated through phosphorylation, serve as critical determinants of synaptic monoamine signaling. Despite decades of therapeutic development, current antidepressants require 4-6 weeks to achieve efficacy, and approximately one-third to half of patients develop treatment-resistant depression. The emergence of rapid-acting antidepressants like ketamine represents a paradigmatic shift, demonstrating symptom relief within hours; however, ketamine's therapeutic potential remains constrained by abuse liability, dissociative …

Therapy-Induced Senescence In Cancer: Developing Senolytic-Based Combination Strategies To Delay Re-Emergence Of Triple-Negative Breast Cancer, Eesha Chakraborty

Theses and Dissertations

Therapy-induce senescence (TIS) represents a major biological outcome of many anticancer treatments and is increasingly recognized as a strategic vulnerability in triple negative breast cancer, which is a highly aggressive subtype with limited therapeutic options and frequent relapse. Here, we probed TIS as a primary cellular response that may ultimately compromise long-term outcomes using standard chemotherapeutic agents in TNBC as well as the antibody-drug conjugate sacituzumab govitecan (SG). Both chemotherapy and SG reliably induced pronounced senescence across TNBC models, yielding durable growth arrest, however, also generating a persistent reservoir of viable tumor cells capable of eventual proliferative recovery, a hallmark …

Effectiveness Of Immersive Virtual Reality Combined With Task-Specific Training On Hemiplegic Arm Function Following Stroke: A Single Case Series Study, Rahsaan J. Holley

Theses and Dissertations

Motor recovery of the arm following a neurological injury is a common goal of the rehabilitation process for individuals impacted by the condition . Due to the long-term functional implications of impaired arm movement, individuals are often trained to use compensatory strategies to complete functional tasks without incorporating the weakened limb. While compensatory strategies offer stroke survivors the opportunity to regain a level of independence, such approaches fail to directly address the underlying causes of the disability (i.e., limited range of motion, decreased strength, poor coordination, motor planning difficulties) which can unfortunately result in long-term impairment and functional disability.

Motor …

Place, Culture, And Care: A Socioecological Examination Of Type 2 Diabetes Among Hispanics In The U.S., Danielle Montoya

Theses and Dissertations

Introduction: Type 2 diabetes (T2D) disproportionately affects U.S. Hispanic populations. This dissertation examined whether structural determinants fundamentally drive T2D disparities among Hispanics, with attention to within-group racial heterogeneity.

Methods: Three studies utilized nationally representative data. Study 1 examined neighborhood segregation and ethnic enclave residence associations with T2D using restricted NHANES data (2011-2018, n=5,056). Study 2 investigated acculturation and T2D associations using restricted NHANES data (2011-2018, n=4,540). Study 3 analyzed patient-provider racial/ethnic concordance and adequate diabetes care using MEPS data (2008-2021, n=17,138).

Results: Structural factors demonstrated primacy across all studies. Neighborhood segregation (aOR=1.17, p>0.05) and ethnic enclave residence showed no …

Opioid Tolerance And Withdrawal In The Mouse Colon, James Fune

Theses and Dissertations

Constipation is a major clinical obstacle associated with opioids, prompting patients to discontinue treatment due to pain, discomfort, and psychosocial stressors. Moreover, chronic users become tolerant to the analgesic effects of opioids, but not to their constipating effects. Upon cessation of long-term treatment, serious diarrhea–among other somatic signs of withdrawal–may ensue. These symptoms become a driving factor for relapse, causing patients to restart opioid treatment. In this study, we aim to understand mechanisms that contribute to opioid tolerance and withdrawal in the colon. Previous findings suggest that constipation occurs partly due to the colon’s lack of tolerance to opioids’ inhibitory …

Establishing A Conventional Linac-Based Electron Flash Beam, Justin Defrancisco

Theses and Dissertations

Problems: A rediscovered radiotherapy technique, FLASH, involves increasing the dose rate to >40 Gy/s. For a given dose, FLASH is shown to decrease the normal tissue complication probability without affecting the tumor control probability. More preclinical studies are necessary to confirm and enable these desirable properties on humans. Current preclinical investigations have diverse constraints, requiring FLASH apparatuses with flexible parameters and accurate control. However, there are limited FLASH platforms available, the existing ones are costly. Our institution is not in possession of any such infrastructure. Even if available, dosimetry and beam control in FLASH are extremely lacking. There is …

Bacteria-Engineered Vesicles For Cancer Immunotherapy: From Immunomodulation In Vitro To Anti-Tumor Effects In Melanoma Models, Lan Li

Theses and Dissertations--Chemistry

Bacterial vesicles hold immense potential in various biomedical fields. Among these, outer membrane vesicles (OMVs) produced by Gram-negative bacteria are the most extensively studied. While the exact mechanism of OMV production remains unclear, numerous environmental factors have been shown to influence both their yield and composition. In this study, we investigated the effect of three different antimicrobial families on OMV production by E. coli. Interestingly, antimicrobials within the same family did not provide the same effects on OMV yield, suggesting that OMV production may not directly correlate with the antimicrobial mechanism of action. OMVs have demonstrated tumor-inhibitory activity in multiple …