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Exploring The Effects Of Serotonin And Selective Serotonin Reuptake Inhibitors On The Neurological, Behavioral, And Cardiovascular Systems Using The Animal Model Of The Syrian Hamster (Mesocricetus Auratus), Ariana Vianey Hinojosa

Theses and Dissertations

Serotonin is a neurotransmitter widely recognized for its role in neuropsychological processes, particularly in regulating mood, cognition, and emotional responses. However, its influence extends beyond the central nervous system (CNS), playing a crucial role in various physiological functions, including metabolism, the gastrointestinal system, reproductive processes, and cardiovascular regulation. As a key modulator of homeostasis, serotonin contributes to maintaining equilibrium within these systems, ensuring proper function and response to environmental stimuli. Despite its well-documented effects on mood and behavior, the broader physiological implications of serotonin remain less understood, particularly in the context of its interactions among neural, behavioral, and cardiovascular systems. …

Carbon Dioxide, Methane, And Nitrous Oxide Fluxes From Managed Aquatic Systems Of The Rio Grande Valley, Siena Rose Stassi

Theses and Dissertations

Greenhouse gas (GHG) dynamics from small-scale inland water remain relatively understudied, with knowledge gaps across ecosystem types and regions. In South Texas, there is a unique system of managed distributaries and their associated ox-bow lakes, commonly known as resacas. Most resacas are artificially managed and considered novel ecosystems, yet their GHG dynamics are unknown. Two resaca systems were monitored throughout one year to understand the magnitude, temporal variation, and environmental drivers of diffusive fluxes of carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), along with ebullitive CH4 emissions. Emissions of both CO2 and CH4 peaked in hot summer months, …

Spatio-Temporal Pattern Of Nutrient Dynamics In The South Texas Coastal Watershed, Mohammad Sadman Alam

Theses and Dissertations

Eutrophication threatens aquatic ecosystems by altering productivity through excessive nutrient inputs. In some systems, primary productivity is limited by nitrogen (N), phosphorus (P), or both, based on the N:P ratio defined by the "Redfield" ratio. South Texas, facing rapid urban growth and industrialization, is at risk of higher nutrient loads, but research on nutrient dynamics in this region is limited. This study investigates nutrient variations in the freshwater (FW) abandoned distributaries of the Rio Grande and hypersaline saltwater (SW) systems. Results showed a significant decrease in dissolved inorganic nitrogen (DIN) and an increase in dissolved inorganic phosphorus (DIP), shifting the …

Family-Centered Organization Creating “Lazos” To Affix Families And Their Students To Education: A Case Study, Erica Gonzalez

Theses and Dissertations

Historically, parental involvement has alternatively shifted from being a central participant within the United States’ education reform to being a secondary input stakeholder primarily due to the constant attempts to align its purpose, presence, and effects in education initiatives. Additionally, the varied constructs considered by multiple researchers and federal or state education agencies to define ‘parental involvement’, the variety of ‘population descriptors’, and ‘types of communication’ have increased the complexity to address the needs diverse family structures have to successfully build “lazos” to affix themselves and their students to education. This case study explores the perspectives low socioeconomic Hispanic families …

Cloning And Heterologous Expression Of Human Nachrs And A Unique Spider Venom Toxin, Christine M. Vega

Theses and Dissertations

Drug development research has long focused on synthesizing novel therapeutics while overlooking isolation from naturally available sources. Recently, the discovery of the therapeutic effects of highly bioavailable animal venom caused the field of venom research to soar in popularity. Animal venom serves as a natural, sophisticated tool optimized over millions of years by evolution with the ability to bind to ion channels such as nAChRs, non-specific ligand-gated ion channels distributed throughout the human nervous system, with high selectivity and specificity. However, purifying individual venom toxins from crude venom is challenging due to its availability. Therefore, synthesizing large quantities of venom …

Exploring Secondary Content And Career And Technical Education (Cte) Teacher Self-Efficacy In Supporting The Literacy Needs Of Long-Termed Emergent Bilinguals: A Mixed-Methods Inquiry, Jennifer Louise Burden

Theses and Dissertations

This dissertation employed a mixed-methods convergent design, incorporating survey data and semi-structured interviews to investigate the self-efficacy of high school teachers in content areas and Career and Technical Education (CTE) towards their perceived abilities to support emergent bilingual students, particularly in content-specific literacy.

Grounded in the theoretical frameworks of Bandura's (1977) self-efficacy theory and Dweck's (2008) growth mindset, this study explores how educators' perceptions of their abilities impact their instructional practices and student outcomes.

Findings reveal a need for more training and resources to increase student engagement, which impacts academic outcomes and attendance and calls for comprehensive reforms in teacher …

A Comparative Study Of Urban And Natural Nesting Gray Hawks In The Lower Rio Grande Valley Of South Texas, Evan Farese

Theses and Dissertations

Urbanization can negatively impact birds of prey, which occupy higher trophic levels. The Gray Hawk (Buteo plagiatus) is a neotropical raptor inhabiting the Lower Rio Grande Valley (LRGV) of Texas, where it is threatened. The species’ ecology has been little studied and it is unclear how urbanization may affect population viability. I studied Gray Hawk reproductive success, diet, and thermal ecology at nests in urban and natural habitats in the LRGV. Camera trap data showed adults at urban nests delivered mostly avian prey, while mammalian prey was most frequently brought to natural nests. Data from temperature loggers showed …

Exploring The Relationship Between Suicidal Behavior And Obesity Among Young Hispanic Adults In The United States, Nadeen Salhadar

Theses and Dissertations

The rates of obesity and suicidal behavior have continued to increase over the years among young adults in the United States. Previous research has indicated a relationship between obesity and suicidal behavior, primarily among women, yet minimal research has been done to examine factors that explain this relationship (i.e., mediators). This study investigated the role of depression, body dissatisfaction, body shame and guilt, insomnia, physical health, and social anxiety on obesity and suicidal ideation among 209 college-aged Latina women. The researcher hypothesized that there would be an indirect relationship between obesity and suicidal behavior through multiple variables. Mediation analyses via …

Emotional Outbursts In Latinx Autistic Youth With Intact Or Non-Intact Families; Frequency, Severity, And Socio-Demographic Correlates, Sandra Lucia Masso Hernandez

Theses and Dissertations

Autism Spectrum Disorder (ASD) is a neurodevelopmental disorder characterized by impaired social interaction, communication, and restricted repetitive behaviors. One of the core difficulties in individuals with ASD is related to emotional outbursts. Emotional outbursts (EO) are behavioral episodes in response to situations, environmental and physiological stimuli that occur in an extreme, unpleasant, sometimes aggressive way, often disproportionate to the context. Considering the impacts that EO’s can cause in populations with neurodevelopmental disorders and on the well-being and mental health of parents/caregivers, the need arises to evaluate these populations. Due to the core characteristics of ASD (such as a rigid mentality, …

Blink-Related Brainwaves As Digital Biomarkers For Cognition Assessment During Complex Tasks, Lexine Carmlixa Sibert-Jolissaint

Theses and Dissertations

Blink-related oscillations (BROs) are neurophysiological responses observed in electroencephalography (EEG) following spontaneous blinking, reflecting the brain processing of new visual information. Prior research has demonstrated BRO responses across various cognitive states, such as resting, cognitive loading, and sensory stimulation, highlighting their potential as a non-invasive biomarker of brain function. We conducted the first investigation of BRO responses during a verbal fluency (VF) task, which is a complex, dynamic task state combining memory, visual perception, executive function, and language processing. Using publicly available EEG data from 22 healthy adults, we measured BRO responses over the left anterior frontal region corresponding to …

The Effect Of Food Preference On The Efficacy Of The High-Probability Instructional Sequence To Treat Food Selectivity, Christina Marie Sheppard

Theses and Dissertations

Food selectivity involves avoiding certain foods based on type, texture, brand, smell, temperature, or presentation, and it affects 80% of children with intellectual and developmental disabilities. Although several antecedent-based and consequence-based behavioral interventions exist to increase acceptance and consumption of food in this population, one antecedent-based intervention that has shown promise both within and outside of a feeding context is the high-probability instructional sequence, which consists of the delivery of three high-probability instructions before delivery of a low-probability instruction. The high-probability sequence is used to increase compliance with instructions that have a low probability of completion (e.g., taking a bite …

Effects Of Different Blue Light Conditions On Saos-2 Cell Viability, Differentiation, And Mineralization, Jamielyn Alcantara Jarvis

Theses and Dissertations

Photobiomodulation (PBM) is a low-intensity light therapy that uses non-ionizing forms of energy to induce a directed cellular response. Prior work has investigated the effects of blue light exposure at energy densities ranging from 1 J/cm2 to 10 J/cm2 on osteogenic differentiation of human gingival mesenchymal stem cells (hGMSCs), human dental pulp stem cells (hDPSCs), and stem cells from the apical papilla (SCAPs) and shown promising outcomes at 4 J/cm2 and then having a detrimental impact at higher energy densities. One key caveat in prior studies is that the blue light energy density was modulated by changing the light exposure …

Are You Patronizing Me? Understanding And Identifying The Implications For Benevolent Racism On Inclusion In The Workplace, Nisha Quraishi

Theses and Dissertations

This study examined the construct of benevolent racism. The purpose of this study was to address the following areas. First, to distinguish benevolent racism in the racism, benevolence, and sexism literature. Second, to examine how minorities experienced benevolent racism in the workplace. Third, to use that data to conduct a quantitative analysis that examined the impact of benevolent racism on work group identification and inclusion. To do so, two studies were conducted. The first study was a qualitative study that conducted interviews which examined how benevolent racism impacted minorities in the workplace. The second study was a quantitative study that …

Transcription Factor Y- Box Binding Protein 1 (Ybx1) Enhances Sorafenib Resistance And Tumorigenic Capacities In Hepatocellular Carcinoma (Hcc), Dennis Kwabiah

Theses and Dissertations

Hepatocellular carcinoma (HCC) is the most common liver cancer, with early-stage cases potentially benefiting from surgical treatments like liver transplantation and hepatectomy. However, advanced HCC stages have poor prognosis due to resistance to therapies, especially sorafenib, a tyrosine kinase inhibitor approved for late-stage HCC. Despite its clinical use, sorafenib has limited efficacy in prolonging survival, and the mechanisms of resistance remain unclear. Analysis of The Cancer Genome Atlas (TCGA) HCC dataset shows elevated Y-box binding protein 1 (YBX1) expression in HCC tumors compared to normal liver tissues. Previous studies have indicated that YBX1 is involved in drug resistance in various …

Investigation Into The Effectiveness Of G-C3n4 For The Degradation Of Indigo Dye In Aqueous Solution Via Electrocatalysis, Rolando R. Barron Jr

Theses and Dissertations

Indigo dye (IUPAC 2-(3-hydroxy-1H-indol-2-yl)indol-3-one) is one of the most used dyes in the textile industry worldwide with more than 40,000 tons produced each year. It can elicit adverse physiological responses in humans including vomiting, diarrhea, and other gastrointestinal conditions, and it is toxic in large amounts. There is also evidence to suggest that indigo is a teratogen and genotoxic in aquatic life. Environmentally, the enormous amount of indigo used in the textile industry has caused rivers and waterways to run blue as well as severely impacting aquatic and plant ecosystems. The chemicals used in its synthesis are also …

Tribological Characterization Of Laser Microtextured Ti-6al-4v Eli Alloy For Biomedical Applications, Nicholas Ricardo Perez

Theses and Dissertations

Titanium alloys have been gaining popularity in multiple fields due to their impressive physical properties, but struggle with poor tribological performance. This thesis aims to mitigate the poor tribological performance of titanium alloys through a laser microtexturing process. Ti-6Al-4V ELI (Extra Low Interstitial) alloy disks were evaluated against ultrahigh molecular weight polyethylene (UHMWPE) and polyether ether ketone (PEEK) pins. Four texturing patterns were created by changing the texture area fraction from 5 to 20% that were evaluated against untextured control samples. The tribological properties of the laser textured Ti-6Al-4V ELI disks were determined using a pin-on-disk tribometer under lubricated sliding …

Low Speed Water Tunnel Flow Testing, Humberto Cesar Grimaldo Jr.

Theses and Dissertations

Water tunnels serve as controlled environments for simulating fluid dynamics, providing an essential platform for studying flow patterns for hydrodynamic effects. This report presents a comprehensive overview and refurbishment of the water tunnel system located at the University of Texas Rio Grande Valley, focusing on its design, operation, calibration, and visualization capabilities for fluid dynamics research. The water tunnel, originally installed in 1995, was restored and updated with structural repairs, including resolving persistent leaks and implementing an improved drain system. A calibration process using a pitot tube and differential pressure transducer was conducted to establish accurate relationships between flow velocity …

Personality Trait Recognition Through Deep Neural Temporal Modeling Of Non-Verbal Behavior, Kushal Vangara

Theses and Dissertations

Personality research seeks to explain the wide range of human behaviors through stable, measurable traits. Human interactions are inherently rich and multidimensional, and analyzing behavioral data offers a promising path to uncover personality insights. The increasing convergence of psychology, computer science, and machine learning has fueled interest in computational approaches to personality assessment. Advances in sensing technologies have made it possible to capture fine-grained information about individuals’ behaviors and interactions in naturalistic and controlled environments. Automated audio-visual analysis techniques extract relevant behavioral cues, which machine learning models then interpret to infer underlying personality traits. This work provides a comprehensive overview …

The Impact Of Sibling Sexual Abuse On Parenting Stress, Giuliana Berry

Theses and Dissertations

Sibling sexual abuse is the most common yet least reported, treated, and studied manifestation of child sexual abuse (Bertele & Talmon, 2023; Caffaro & Conn-Caffaro, 2005; Krienert & Walsh, 2011; O’Brien, 1991). It is a particularly challenging form of intrafamilial sexual abuse for parents and caregivers because their children are both the victim and the perpetrator of the abuse. They struggle to balance the needs of both children (Duane et al., 2002; Tener et al., 2020) and may experience heightened stress and associated psychological difficulties. Parenting stress is linked to child and adolescent posttraumatic stress and internalizing and externalizing problem …

Trends In And Factors Associated With Science Achievement Among Eighth Graders In Saudi Arabia: A Secondary Analysis Of Timss Data, Roba Alzahrani

Theses and Dissertations

This secondary analysis examined trends in and factors influencing science achievement among eighth-grade students in Saudi Arabia, using data from the Trends in International Mathematics and Science Study (TIMSS). However, Saudi Arabia's performance on the TIMSS science assessments fell below the international average, from 2003 through 2019. In addition, gender differences in science achievement have been observed, with female students outperforming male students by 30 or more points. This study addresses two problems: factors associated with the lower performance of Saudi students on TIMSS science assessments compared to global standards, and the small number of studies which explored factors which …

Analysis And Derivation Of The Compressible Euler System With Nonlinear Velocity Alignment: An Investigation Into Collective Behavior, Mckenzie Meredith Black

Theses and Dissertations

Collective behavior refers to the observable patterns, actions, or movements that emerge within a group of entities, such as individuals, animals, or particles, when they interact with each other. In this study, we concentrate on the pressureless compressible Euler system, expanding it to incorporate a family of nonlinear velocity alignment. This extension represents a nonlinear iteration of the Euler-alignment system within collective dynamics, revealing intriguing asymptotic emergent phenomena such as alignment and flocking. Our investigation explores different types of nonlinearity and nonlocal communication protocols, unveiling a diverse spectrum of asymptotic behaviors within the system.

In focusing on the derivation, we …

Understanding The Through-Space Intermolecular Interactions Of Isothiourea Catalysts In Acylation/Silylation Reactions Of Secondary Alcohols, Ziyuan Gong

Theses and Dissertations

Through space interactions, including cation-π interaction, lone pair-πinteraction, steric hinderance etc. play a central role in organocatalytic reaction. They can control the reactivity or the selectivity of an organic reaction. Previous work in our group has already shown that the chiral isothiourea compounds can catalyze the acylation as well as silylation reaction of secondary alcohol with the possible cation-πinteraction between the catalyst and substrate. However, there is lack of study to understand how the delocalization of the positive charge would affect the reaction rate and whether some unexpected inter- or intramolecular interaction could help stabilize …

Investigating The Use Of Socio-Scientific Issues As Phenomena Through A Storyline Framework In A High School Biology Course, Dana Marie Delpha

Theses and Dissertations

This action research dissertation investigates the efficacy of a socio-scientific phenomena-driven biology curriculum in a Title 1 Massachusetts High School. Grounded in social constructivism, culturally relevant pedagogy, and self-determination theories, the study explores the impact of socio-scientific phenomena on students’ perceived importance of science education, motivation, engagement, and achievement. A mixed-methods approach was used, and data was collected through student engagement reflection, Science Motivation Questionnaire, and pre- and post-assessments to holistically evaluate the efficacy of the curriculum. The findings include increased student engagement, motivation, and achievement after participating in the intervention, which supports the motivation-engagement-achievement feedback loop. Student agency was …

Keep Your Head Up: An Examination Of Out-Of-School Literacy Practices In An Intergenerational Family System, Johnnie D. Bryant-Johnson

Theses and Dissertations

The asset-based qualitative study used a phenomenological approach within a Community Cultural Wealth framework to question the practices of an intergenerational family system in the Southeastern United States. The study investigated the family system’s out-of-school literacy practices and the exposure to culturally relevant literature. The study revealed that an elder who actively participated in rearing school-aged children intentionally introduced culturally relevant literature. Similarly, the study revealed that the primary caregivers did engage their school-aged children in conversations related to social justice and introduced them to culturally relevant texts. However, a child's inquiry into the topic initiated primary caregivers’ introduction to …

Who Am I As A Learner? The Effects Of A Self-Regulated Learning Intervention On Ninth Graders’ Academic Self-Concepts And Intrinsic Motivation, Kaitlyn Elizabeth Bailey

Theses and Dissertations

The transition from middle school to high school is a notoriously difficult one, and a student’s success in ninth grade is typically a predictor of future success in high school. Unfortunately, many ninth graders struggle to engage in school. Despite their capability to complete the work, these students appear unmotivated and simply disengaged from school. In this action research case study, three students had the opportunity to share their education stories and the experiences that have shaped their academic self-concepts. These students also participated in a self-regulated learning intervention to determine if students’ feelings of autonomy, competence, and relatedness could …

Bridging The Gap Between Science And Technology: A Descriptive Study Identifying Factors Influencing 6-8th Grade Science Teachers’ Implementation Of Virtual Laboratory Simulations, Coral Nicole Hoesli

Theses and Dissertations

Teachers at a South Carolina middle school in the United States were not implementing virtual laboratory simulations at the same rate as other middle schools in the district. This descriptive research examined 6th-8th grade middle school science teacher perceptions and influencing factors behind the choice to implement virtual laboratory simulations. The study examined two research questions: (1) what are the personal and social factors influencing science teachers’ decisions to implement a virtual laboratory simulation, and (2) what are the structural factors influencing science teachers’ decisions to implement a virtual laboratory simulation?

The National Educational Technology Plan (NETP) and the International …

Assessing Relationships Between Water Quality, Precipitation, Land Cover And Stormwater Conveyance Type Across A Range Of Sub-Watersheds In The Southeastern Coastal Zone, Kevencia Sabine Gabriel Faton

Theses and Dissertations

The expansion of urban land use/cover along the coast may degrade water quality by introducing a plethora of pollutants and pathogens that negatively impact human and ecological health. It is hypothesized that anthropogenic contaminants associated with stormwater runoff increase with increasing urban density and vary with the timing and magnitude of rainfall. In this study, we examined land use/cover change and relationships between Escherichia coli (E. coli), turbidity, nutrients, and the timing and magnitude of rainfall in two different types of stormwater conveyances (ditches and ponds) within Murrells Inlet, SC during the summer of 2023. Our results indicate …

Building A Framework For Analyzing Non-Linear And Multidimensional Kinetics, Mainak Dhar

Theses and Dissertations

Many materials exhibit multiple rates of molecular relaxation due to structural complexities. Standard linear and one-dimensional kinetic cannot extract all the necessary dynamic information about these systems. This dissertation contributes to an overarching scheme to develop new non-linear and multidimensional kinetic experiments to obtain this information. The studies span computation and experiments, picosecond to second timescales, and both single-molecule and pulsed-laser kinetics

Single-molecule kinetics experiments yield time series that contain information about unique structural and dynamic properties of materials. However, these time series are noisy, and data analysis is challenging. Parametric methods are computationally intensive and require strong, unverifiable assumptions …

The Design And Optimization Of Optical Systems For The Detection And Characterization Of Phytoplankton, Caitlyn M. English

Theses and Dissertations

Phytoplankton are among the smallest organisms found in marine and freshwater ecosystems. Despite their small size, phytoplankton play a vital role in sustaining life on Earth as primary producers. Through oxygenic photosynthesis phytoplankton are also responsible for large scale carbon fixation and oxygen production. The distribution of phytoplankton in a given water resource can exhibit a high degree of variability across time and space, and this is in large part due to their varying sensitivities to environmental conditions such as resource availability and grazing by predator organisms. As such, phytoplankton community structure is widely used as an investigative tool for …

Systems Check: A Qualitative Case Study Of Educators And Parent-Educators Supporting Adolescent Readers From An Ecological Systems Perspective, Kristi Nicole Grooms

Theses and Dissertations

In spite of decades of research and an abundance of well-intentioned intervention efforts, supporting adolescent readers, particularly at the middle level, remains a significant area of concern for educators in the United States. The struggles are present for educators working to help underperforming readers reach grade-level and keep advanced readers motivated and engaged. At home, parents and guardians experience similar challenges. Data on adolescent comprehension performance continues to be frustrating in terms of producing consistent positive results. This qualitative action research study investigated the ongoing challenge of supporting adolescent readers, specifically within the context of 7th grade, through a systems …