Digital Commons Network^™

Development Of New Routes For The Synthesis Of Carbaporphyrins And Carbachlorins, Navneet Sahota

Theses and Dissertations

Carbaporphyrins and carbachlorins are porphyrin analogs in which one of the nitrogens is replaced with a carbon atom within a porphyrin-like cavity. These systems form stable organometallic derivatives and exhibit unusual chemical reactivity. In the monocarbaporphyrinoids such as benzocarbaporphyrins, one of the pyrrole rings is replaced by an indene unit. Although syntheses of monocarbaporphyrins with fused rings have been widely investigated over the past 20 years, a few examples of carbaporphyrins without fused rings have been reported in the literature.

In this thesis, two projects were conducted to further explore carbaporphyrin and carbachlorin chemistry. The first project utilized a ‘3+1’ …

An Exploratory Investigation Of The Effects Of Power-Solving, A Social Problem Solving Method, On Students With Communication Impairments, Kylie Christine Pringle

Theses and Dissertations

The purpose of this investigation was to examine students with communication impairments ability to learn problem solving skills, using the POWER-Solving method, and the effect on positive social interactions. The results indicated that all 10 participants increased positive social interactions with their peers through teacher observations and pre and post rating scales. In addition, increases in the students' emotional vocabulary, as well as their ability to identify feelings were found. It seems that the POWER-Solving method would be beneficial in increasing positive social interactions of students with communication impairments. Future studies may focus on maintenance of their problem solving skills …

A Human-Centered Design Approach To Enhance Children’S Collaboration And Facilitate Learning Using Tangible User Interface, Wafa Sulaiman Almukadi

Theses and Dissertations

Mark Weiser’s 1988 vision of ubiquitous computing was the source of many research efforts, which contributed to incorporate computers into our current everyday life. One of the research topics is “Tangible User Interface” (TUI) that provides physical representation and control of underlying digital information. This dissertation describes how TUI can support children’s learning and enhance the classroom environment, in which children can interact and engage in language and math exercises using digital augmented physical blocks. This TUI environment enables children to learn, either individually or cooperatively, how to assemble letters and form words, as well as calculate using numbers and …

Language Acquisition With English Language Learners Who Have Developmental Delays, Eliza Racquel Gardner

Theses and Dissertations

The current study examined the effects of language instruction with two preschool age students who are English language learners who have developmental delays using the incidental teaching method. Language targets were randomly chosen according to the language level of each student and the targets were either in Spanish (L1) or English (L2). The students were in a special education classroom and researchers worked with them one-on-one, using the natural learning environment to teach and to better implement learning objectives. Targets were withheld during play and students had to mand, tact, or use intraverbal skills to receive the item. Their reward …

Chemogenetic Stimulation Of Electrically Coupled Midbrain Gaba Neurons In Alcohol Reward And Dependence, Stephanie Suzette Pistorius

Theses and Dissertations

The prevailing view is that enhancement of dopamine (DA) transmission in the mesolimbic system leads to the rewarding properties of alcohol. The mesolimbic DA system, which plays an important role in regulating reward and addiction, consists of DA neurons in the midbrain ventral tegmental area (VTA) that innervate the nucleus accumbens (NAc). It is believed that VTA DA neurons are inhibited by local gamma-aminobutyric acid (GABA) interneurons that express connexin-36 (Cx36) gap junctions (GJs). We have previously demonstrated that blocking Cx36 GJs suppresses electrical coupling between VTA GABA neurons and reduces ethanol intoxication and consumption suggesting that electrical coupling between …

Causes And Consequences Of Individual Phenotypic Differences In Brachyuran Crabs With A Focus On Behavior, Benjamin A. Belgrad

Theses and Dissertations

Individual variation defines almost every morphological, physiological, and behavioral aspect of populations and is a fundamental component of many ecosystem processes. Recent work indicates that accounting for these individual differences can enhance our ability to predict community responses to environmental disturbances which is becoming increasingly important in an era of extraordinary global change. However, our understanding of how different individual characteristics are connected to each other and governed by the environment remains limited.

This study sought to evaluate the relationship between individual behavior, physiological condition, and local habitat for Brachyuran crabs as well as the subsequent strength of their predator-prey …

Evaluation Of A Social And Emotional Learning Curriculum Integrated Into A Middle School Health Classroom, Stephanie Susan Skiba

Theses and Dissertations

Although approximately one-fourth of adolescents have a mental health disorder only half of them receive treatment. The goal of this study was to determine if Strong Kids, a social and emotional learning curriculum, implemented over a 4-week period could help decrease internalizing symptoms and increase resilience in middle school students, something not previously investigated. This study also measured social and emotional knowledge as measured by the Strong Kids questionnaire. Additionally, treatment fidelity and social validity were measured. The study used a non-equivalent, control group design. The sample consisted of 148 students: 70 in the treatment group and 78 in …

Insulin And Ketones: Their Roles In Brain Mitochondrial Function, Sheryl Teresa Carr

Theses and Dissertations

The prevalence of both Type 2 diabetes mellitus (T2DM) and Alzheimer's disease (AD) is increasing worldwide, and the trends are unfortunately expected to continue. AD has recently been tied with mitochondrial dysfunction and insulin resistance, creating a mechanistic tie between AD and T2DM. Unfortunately, insulin resistance is often increased with aging and therefore, all individuals are at risk of brain mitochondrial dysfunction. Without proper mitochondrial function, the brain will degenerate, causing impaired cognitive function and reduced quality of life. The purpose of this study is two-fold: first, to understand the role of ceramides in insulin-induced brain mitochondrial dysfunction, and; second, …

Natural Disaster Films: A Social Learning And Perceived Realism Perspective, Melissa Seipel

Theses and Dissertations

This study investigates the relationship between social learning and perceived realism in the context of an entertainment media text, the 2015 movie San Andreas. As a fictional natural disaster movie, this film depicts several safety and survival techniques that could potentially be observed and adopted by audience members should they face a similar situation (i.e. major earthquake). While the majority of these techniques align with professionally recommended behaviors, a few are misleading. This study investigates the perceptions, attitudes, beliefs, and behavioral intentions different groups of audience members hold concerning the behaviors they observed in the film. Participants were grouped by …

The Development Of Theory Of Mind And Inhibitory Processing Among 7-11 Year Old Mexican And Mexican American Children, Daniela Kuri

Theses and Dissertations

The present study examined the relationships among demographic factors and aspects of social and cognitive development in 130 predominantly bilingual Mexican and Mexican-American 7-to-11-year-old children residing in Mexico and the United States. Measures assessed children’s WMLS-R Picture Vocabulary, inhibitory processing, visual-spatial problem solving, and theory of mind development. Demographic information was obtained from parents. Intercorrelations among age, WMLS-R Picture Vocabulary , inhibitory processing, visual-spatial problem solving, and theory of mind (ToM) revealed that ToM related to inhibitory processing, but not with visual-spatial problem solving skills, after controlling for age. Findings suggest that cultural and other individual factors might play an …

Time Dependent Solution For An Incompressible Viscous Fluid Flow In A Cavity, Bishnu Parajuli

Theses and Dissertations

The Finite Element Method is used to find the time dependent solution for an incompressible viscous fluid flow in a cavity in two dimension. The governing equations for this system are the continuity equation and the momentum equation. We use finite element method to obtain the dependent variables. Here we derive weak formulation and develop finite element model by using Galerkin Method. Then we compute velocity components of the fluid for a square cavity. The numerical results are presented.

Multi-Type Branching Processes Model Of Nosocomial Epidemic, Zeinab Nageh Mohamed

Theses and Dissertations

The potency of an infectious disease to spread between different types of susceptible individuals in a hospital determines the fate of controlling nosocomial epidemics. I use a multi-type branching process with a joint negative binomial offspring distribution to study nosocomial epidemics. In particular, I estimate the basic reproduction number R0 and study its relationship with the offspring distribution’s parameters at different and fixed number of generations. Also, I study the effect of contact tracing on estimates of R0.

Assessment Of Long-Term Effects Of Woody Plants Expansion In Humid, Tropical Grassland Of Venezuela, Soraya A. Delgado

Theses and Dissertations

The invasion of woody plants into grassland communities, or shrub encroachment, is a worldwide phenomenon usually attributed to anthropogenic interference. Most studies have focused on temperate and arctic biomes. Less is known about how shrub encroachment is affecting humid tropical grasslands, which have different climates, higher levels of biodiversity and different histories of human land use. This project quantifies the rate of woody vegetation change in a humid tropical grassland of Venezuela using remote sensing over the past quarter century and ground based measurements of selected individual species. Results of remote sensing indicate high rates of conversion of grasslands to …

Parameterization Of Ar231453: A Potent Agonist Of The Gpr119 Receptor, A Target For Diabetes Treatment, John E. Hamilton

Theses and Dissertations

The first reported potent agonist for the GPR119 receptor, a potential target for the treatment of diabetes, is 2-fluoro-4-methanesulfonyl-phenyl-{6-[4-(3-isopropyl-[1,2,4]oxadiazol-5-yl)-piperidin-1-yl]-5-nitro-pyrimidin-4-yl}-amine (AR231453). The dynamic interactions of AR231453 with GPR119 using molecular dynamics simulation are of great interest. However, parameters for AR231453 that describe the behavior of the molecule in the CHARMM force field have not been determined. The following study produces parameters by creating model fragments and compares the produced parameters to quantum calculations. The produced parameters are then further refined within the Visual Molecular Dynamics (VMD) program’s plugin program, the Force Field Toolkit as well as Gaussian 09 and CHARMM. Molecular …

Solitude And Our Projected Dreams, David E. Jamison

Theses and Dissertations

“Cineplex” is a creative writing manuscript discussing isolation, escapism, and the way narrative inherently distorts our understanding of the world. Many of my characters are isolated people who create their own fantasies to escape otherwise dreary circumstances. Others try to live their lives by a narrative they see on television or in the news and ultimately discover that reality is infinitely more complex than they have been lead to believe.

Applications Of Side Scan And Parametric Echosounders For Mapping Shallow Seagrass Habitats And Their Associated Organic Carbon, Austin L. Greene

Theses and Dissertations

Despite a global valuation of $1.9 trillion seagrass habitats world-wide are in decline—directly impacting the large soil carbon stocks associated with seagrasses. Many methods exist to measure the health of seagrass habitats, yet few apply to shallow coastal ecosystems. Those that do lack spatial resolution (satellite surveys) or do not provide continuous data across large areas (point-based surveys). Furthermore, carbon content of these ecosystems is largely limited to destructive and time-consuming soil core sampling. Side scan and parametric acoustics represent a unique technological opportunity to study habitat coverage and carbon content of vegetated coastal habitats (< 3 m depth). This study presents proof of concept for applications of recreational side scan and parametric sub-bottom profiling sonars in mapping both habitat coverage and organic carbon distribution in shallow seagrass habitats, and explores how these methods might be improved in future applications.

Investigating The Mathematical Dispositions And Self-Efficacy For Teaching Mathematics Of Preservice Teachers, Jasmine M. Cruz

Theses and Dissertations

The study of the individual's beliefs and the role and influence they have on the individual's actions and behaviors, have long been examined and investigated by educators and psychologists. Moreover, researchers have overwhelmingly claimed and demonstrated that the beliefs held by teachers significantly influences their behavior and educational practices in the classroom. This thesis study investigates the mathematical disposition and self-efficacy for teaching mathematics of preservice teachers. The study's primary goals are to discover if there is a relationship or association between a teacher's mathematical disposition(MD) and his/her self-efficacy for teaching mathematics (SEFTM), and if there are significant differences between …

Decomposition Of Black Mangrove (Avicennia Germinans ) Leaf Litter: Calibrating Estuarine Indicators Of Functional Recovery, Leticia Martinez Contreras

Theses and Dissertations

Decomposition of plant material produced by mangroves and other macrophytes in estuaries occurs in both sediments and the water column. Early and intense processing could be more common in the water. In a previous study, in situ decomposition rates of Black Mangrove (Avicennia germinans ) leaf litter suspended in the water column differed among three estuaries in south Texas with moderate differences in salinity, water temperature, available nitrogen (N), and tidal flow. A series of microcosm experiments were conducted to determine the influence, within observed ranges in the estuaries, of these water variables on mass loss of Black Mangrove …

Neuromuscular And Arterial Compliance Responses To Different Resistance Training Frequencies And Protocols, Patrick Murphy

Theses and Dissertations

PURPOSE: The purpose of this study was to determine the impact of blood flow restriction and resistance training on arterial elasticity, EMG activity, and strength indices among sedentary to recreationally active females who completed 6 weeks of resistance training.

RESULTS: Significant time*condition interactions occurred in LE-1RM (p

CONCLUSION: The research group(s), 1–2 days/week with and without blood flow restriction, may increase training adaptations and responses parallel to the control group (3 days/week). There appears to be no differences in arterial compliance between groups.

Coupled Telegraph And Sir Model Of Information And Diseases, Jose De Jesus Galarza

Theses and Dissertations

In this work, the effect of information propagation on disease spread and vaccination uptake through networks is studied. In this model the information reaches different people at different distances from the center of information containing the health data. We use a pair of Telegraph equations to depict the vaccine and disease information propagation on a network embedded into a straight line. The Telegraph equation is coupled with an SIR (Susceptible-Infected-Recovered) model to examine the anticipated mutual influence. Numerical simulations and stability analysis were made to study the model. We show how the propagation of information about the disease impacts the …

Genetic Variation In Two Economically Important Arthropod Vectors Of Citrus Diseases, Alejandra Fuentes

Theses and Dissertations

Arthropod vectors are agriculturally and ecologically important because they transmit numerous plant pathogens. Commonly, control strategies for vector-borne plant pathogens focus on suppression of vector populations. Genetic variation studies in pest populations provide useful information for biological control, understanding pesticide resistance, and inferring global movement patterns. In chapter I, genetic variation of worldwide populations of Diaphorina citri, the vector of Citrus greening disease, was examined to assess potential sites of origin of invasive populations. The results showed population structure at regional levels, suggesting limited gene flow and revealing patterns of invasion. In chapter II, I explored the community of …

Examining Culture And Gender Roles In Latina Undergraduate Participation In Stem At Utrgv, Stephanie Garza

Theses and Dissertations

The study was designed to examine the role of familism and gender role beliefs on Latina pursuit of a degree in Science, Technology, Engineering, and Math (STEM) fields. This study surveyed Latino/a undergraduate students at the University of Texas-Rio Grande Valley to determine the influence of socioeconomic status, familism and gender role beliefs on pursuit of careers in STEM. Participants completed a demographic questionnaire, the Pan-Hispanic Familism scale, the Attitudinal Familism scale and the Gender Role Beliefs scale. Findings revealed how major selection and pursuit of STEM is affected by students’ income level, familism, gender, and gender role beliefs. Results …

Cenzontle/Mockingbird: Empowerment Through Mimicry, Daniel Garcia

Theses and Dissertations

My collection is a polythetic assortment of poetry, prose poetry, monologue and drama that serves as a polyglottic exhibition of empowerment through mimicry. Like a mockingbird, whom the Aztecs call “cenzontle” in their Nahuatl tongue, my writer’s voice is polyvoiced. I include in this collection an eclectic variety of voices: personas, languages, forms, styles, and identities—often mixing them, in part to entertain and in part to challenge my boundaries as a writer, to stretch my vocal chords, so to speak, but also in part to challenge the lingering prejudice against such mestizaje—or meeting and mixing of cultures (and also voices)—and …

A Study On The Effects Of Mutation On Populations Using Strategies While Playing Iterative Prisoner's Dilemma, Ramses Romulus De Guzman Reyes

Theses and Dissertations

This thesis examines the effects different types of mutation and mutation rates have on populations using strategies while playing the Iterative Prisoners Dilemma (IPD). The system used in order to conduct this study was used in Leas et al. (2016), which uses genetic algorithms as a means of studying memory and its impact on populations playing IPD. For this study, experiments are organized into three different environments: Control, Static and Dynamic. The Control Environment focuses on analyzing the system and forming initial results. The Static Environment focuses on studying the effects of different rates on strategic populations playing IPD, while …

The Gloria E. Anzaldúa Journey: Path To Conocimiento A Testimonio Of Queer Heroics, Veronica Solis

Theses and Dissertations

As an auto-historia testimonio, I approach my work from my experience with performance poetry where I used my personal experiences to express the continuum of gender through poetry. I also draw from Gloria Anzaldúa’s “path of conocimiento” as a framework for my narrative stories as queer rites of passage.

Desorption Electrospray Ionization (Desi) Mass Spectrometric Imaging Of Spatially Regulated In Vivo Metabolic Rates, Charlotte Reininger Lewis

Theses and Dissertations

Desorption electrospray ionization (DESI) is an ambient ionization technique used for mass spectrometric imaging of biological samples. When coupled with isotopic ratio measurements of deuterium-labeled tissues, DESI provides a means of measuring metabolic rates on a spatially resolved basis. In vivo metabolic rates are desired to better understand diseases such as Alzheimer's, Parkinson's, Huntington's, and various forms of cancer that negatively impact metabolic rates within different organs of the human body. Although DESI has been used to image lipids and metabolites of a variety of tissues and other imaging techniques, such as NIMS, have been used to study kinetic turnover …

Characterization Of Sufs And Sufe Of Suf Pathway For Fe-S Cluster Assembly In Escherichia Coli, Guangchao Dong

Theses and Dissertations

Fe-S clusters are one major type of the sulfur-containing cofactors, which conduct essential functions in organisms. The Suf pathway is one of the three main pathways for the biosynthesis of Fe-S clusters. In E. coli, the Suf pathway is utilized under iron limitation and oxidative stress. This ability is important for pathogens to survive. Also, the Suf pathway is found to be exclusive in bacteria, so it is a good target for novel antibiotic design. SufS is a cysteine desulfurase in the Suf pathway to extract sulfur from L-cysteine. It needs the enhancement of SufE. To better understand the catalytic …

Posttraumatic Growth Development: Core Belief Disruption, Event Centrality, And Time Since Trauma, Christopher A. Cook

Theses and Dissertations

Posttraumatic growth describes positive changes that individuals may experience in the aftermath of traumatic events that have significantly disrupted their core beliefs about themselves and their understanding of the world. Alternate models of posttraumatic growth have challenged the conceptualization of posttraumatic growth as personality change, in part due to lack of research that supports a relationship between the development of posttraumatic growth and the amount of time since the traumatic experience, and factors related to the development of posttraumatic growth. Recent research on the role that event centrality plays in the development of posttraumatic growth is promising (e.g., Johnson & …

Assessing Women's Attitudes Towards Genetic Testing For Hereditary Breast Cancer, Taylor Jane Apostolico

Theses and Dissertations

OBJECTIVES: Hereditary Breast and Ovarian Cancer (HBOC) is an autosomal dominant cancer predisposition syndrome with a 46-87% lifetime risk of breast cancer. Unaffected women who have HBOC are eligible for more screening procedures and prophylactic surgeries that may reduce the risk of developing cancer by up to 95%. The objectives of this study were to assess women’s awareness of and interest in breast cancer genetic testing services, as well as women’s attitudes and beliefs regarding the clinical utilization of HBOC genetic testing across demographic categories. METHODS: Two-hundred and sixty-eight women completed a 35-item survey designed to capture perceptions of HBOC …

The Energetic Consequences Of Temperature Variation And Sequential Autotomization For The Stone Crab, Menippe Spp., Eric R. Hancock

Theses and Dissertations

The stone crab, Menippe spp., is harvested in a claw only fishery along the Gulf and southeastern Atlantic coasts of the United States. As climate change continues to warm these areas, crabs are forced to cope with higher water temperatures and lower dissolved O2 concentrations. These altered environmental conditions may influence crab energetics by altering both energy intake and expenditure. To inform fishery sustainability as well as prepare for a potential range expansion of the crab, this study investigates the energetic intake and expenditure of individual stone crabs. Crabs were found to respire 80 and 69% more following the loss …