Digital Commons Network^™

Maternal Nutrient Restriction And Melatonin Supplementation Alter Neurotransmitter Pathways In Bovine Fetal And Placental Tissues, Allison R. Harman

Theses and Dissertations

Nutrient restriction is a relatively common production insult to pregnancy in cattle. Recently, melatonin supplementation has been investigated as a possible therapeutic to rescue the negative effects of nutrient restriction. Neurotransmitters have been implicated as having negative programming effects in mouse and human pregnancies, manifested as metabolic and neurologic disorders. The role of neurotransmitters in fetal development has only begun to be understood in mice and humans. Neurotransmitters have not been analyzed in cattle, much less within the context of a compromised pregnancy. Brangus heifers were allotted to one of four treatments (ADQ-CON, RES-CON, ADQ-MEL, RES-MEL) in either Fall 2019 …

Effects Of Mass Death On Community Structure And Ecosystem Function, Abby Kimpton Jones

Theses and Dissertations

Death and decomposition are natural processes that are generally well-understood. However, large events of death, such as mass mortality events (MMEs) are increasing in frequency and their impacts on the ecosystem are largely unknown. These events may have both bottom-up effects from increased nutrient input as well as top-down effects from loss of an ecological functional group by the affected population. Different functional MMEs may result in different top-down effects, creating cascading effects. In Chapter 1, I test the hypothesis that scavenger and herbivore simulated MMEs generate novel bottom-up and top-down effects. Results indicate that MMEs have a significant effect …

Soybean Potassium Utilization During Reproductive Growth Stages In Response To Potassium Timing, Potassium Rate, Herbicide Injury, And Desiccation, Tyler Lawrence Richmond

Theses and Dissertations

Potassium (K) deficiency of soybean [Glycine max (Merr.) L.] is common throughout the Mid-Southern region of the United States. Visual symptoms of K deficiency may be absent or subtle during early and mid-reproductive growth stages. Correcting K deficiency in-season is problematic due to limited research. Information regarding soybean yield response to in-season fertilizer K application time is limited to growth stages prior to the onset of R1. Research is also limited on new higher yielding soybean cultivars. The objective of this study was to evaluate influences of in-season K application timing during reproductive growth stages on soybean yield. Field experiments …

Jack And Phil: Associations Between Exposure To Television Parents, Parental Stress And Efficacy, Jane Elizabeth Shawcroft

Theses and Dissertations

Although parents in television are often depicted in negative patterns, little to no research has empirically examined the effect of viewing these depictions of parent efficacy and stress. The purpose of this study is to use experimental methods to assess the effect of viewing authoritative, authoritarian, and stereotypical depictions of parents in television on parental efficacy and parent stress. A sample of 122 parents of adolescents were randomly assigned to one of three condition groups: authoritarian, authoritative, and stereotypical. Each group watches a different clip from a television show, and then reported on their comparison of themselves against the parents …

The Acceptability And Feasibility Of Virtual Parent Acceptance And Commitment Therapy Groups: A Feasibility Study, Abigail Elizabeth Moretti

Theses and Dissertations

Parents of children with autism spectrum disorder (ASD) experience higher rates of anxiety, depression, and poor overall well-being, particularly when their child also engages in challenging behavior (e.g., self-injury, aggression, property destruction). Acceptance and commitment therapy (ACT), which encourages psychological flexibility and attending to the present moment, is particularly suited for this population because parents of children with ASD experience high stress levels and difficulty with adaptive coping. The aim of the current study is to examine the feasibility and acceptability of implementing virtual ACT groups with parents of children with ASD and co-occurring challenging behavior. Participants attended an in-person …

Mediation In A Science Classroom, David Ray Davis

Theses and Dissertations

Languaging and translanguaging are very important concepts in science classrooms when considering their role as mediational tools for supporting emergent bilingual students' needs. Languaging, including translanguaging, has to do with how people perceive, connect, and understand the activities and utterances around them through verbal and non-verbal communication in any language. This study positions languaging and translanguaging as mediational tools that can be used for supporting the use of science terms and overcoming second language challenges with them. Emergent bilingual students can benefit from the implementation of languaging characteristics that promote classroom discourse spaces where all their repertoire for responding, and …

The Worst Horror Of All: Greene’S Political And Salvific Imagination In Brighton Rock, James C. Mcguire

Theses and Dissertations

An evaluation of Graham Greene's Brighton Rock as it apprehends the Catholic novel as form. With ample assistance from Graham Greene's The Power and the Glory, Robert Hugh Benson's The Lord of the World, and select works of Fredric Jameson—most notably The Political Unconscious—this analysis seeks to clarify the politico-spiritual "horizon" evident in Greene's first "Catholic novel." By reviewing the novel through the lens of both Catholic theology and modern historical dialectic material criticism, this evaluation reclaims Graham Greene's early political radicalism that critics identify better in his later, less-religious texts. Discovered most clearly in the ending …

Abm Simulation Model Of A Pandemic For Optimizing Vaccination Strategy, Gibeom Park

Theses and Dissertations

This study presents a process-oriented hybrid model for individuals' immune responses and interactions involving vaccination to describe the trend of contagious disease and estimate the future societal cost. The model considers "recovery" as a non-absorbing state and incorporates various infection stage states including two symptomatic states. To model contagiousness to be consistent with the current pandemic and include that the spread of a disease depends on the mobility of people, we developed an Agent-Based Simulator that fitted to the particular model used in this study and can test various what-if scenarios. We improved the simulator considerably by appying data structures …

External Laryngeal Oscillation And Aerodynamic Measures Of Voice Onset: A Translational Study, Erik Mcleod Christensen

Theses and Dissertations

The purpose of this study was to examine external laryngeal oscillation and its potential effects on phonation threshold pressure (PTP; cm H2O) and phonation threshold flow (PTF; L/sec). Measures of PTP and PTF have inherent limitations due to the nonlinear nature of phonation, influencing their clinical and experimental utility. This is true particularly for tracking relatively small changes in voice function because variability in the measure itself can be larger than that resulting from voice change. Elevated PTP and PTF are associated with a variety of voice disorders and correlate with self-reported vocal effort and fatigue. Prior studies involving silicone …

Understanding The Complexities Of Anemia In Chronic Inflammatory Diseases From Diagnosis To Treatment, Naomi Rae Flindt

Theses and Dissertations

Iron is an essential nutrient for energy and DNA replication. Its homeostasis is commonly perturbed by chronic inflammatory mechanisms. Chronic inflammation upregulates a cytokine, hepcidin, that degrades the iron export protein ferroportin. Without a way to export iron into the bloodstream iron availability in blood becomes depleted. Iron depletion in the blood stream hinders erythropoiesis and is termed anemia. Herein I investigate and inhibit the mechanism of hepcidin activation. Inhibition of hepcidin activation has released iron from tissues and alleviated anemic conditions in a cancer model. I have laid the foundation to investigate this pathway in a 3D spheroid model. …

Estimating Age In Mule Deer: Accuracy And Influence On Reproduction, Morgan S. Hinton

Theses and Dissertations

Accurate estimates of parameters and demographic rates of wildlife populations are crucial to management and conservation. One parameter of interest is age because it influences multiple demographic rates and behaviors including reproduction, dispersal, migration, and disease transmission. There are a number of methods used to estimate ages of wildlife. One of the most common methods used for mammals is evaluation of patterns in dental eruption and tooth wear. In the first chapter, we evaluate the accuracy associated with estimates of age from dental eruption and patterns of tooth wear for mule deer (Odocoileus hemionus). In the second chapter, we use …

Bittersweet Experiences For Brazilian Newcomers: Positive Interactions, Microaggressions, And Isolation In English-Only And Dual Language Bilingual Education Programs, Rose Renee Whitney

Theses and Dissertations

With the rise of the number of immigrant children in schools across the U.S., education research has directed its attention to understanding these newcomers' social experiences at school. Though Brazilian immigrant populations are growing, research on their unique social experiences remains limited. Grounded in critical sociocultural theory, this interpretive phenomenological study shares the social experiences of four Brazilian newcomers in elementary school. Participants were adolescents who had immigrated to the U.S. as children and attended English-only and/or Dual Language Bilingual Education (DLBE) programs. As adolescents, participants were able to look back on their experiences as a newcomer in elementary school …

How Federal Pollution Discharge Permits Affect U.S. Water Quality: A Study On Concentrated Animal Feeding Operations, Cloe C. Mueller

Theses and Dissertations

This paper uses difference-in-difference regression models to examine how state-level pollution discharge permits on concentrated animal feeding operations affect U.S. water quality. I ultimately deem the permitting to be ineffective at improving water quality, calling attention to the need to re-evaluate the ``socially optimal level of pollution."

The Effects Of Polymorphisms Of Viral Protein R Of Hiv-1 On The Induction Of Apoptosis In Primary Cells And The Characterization Of Twelve Novel Bacillus Anthracis Bacteriophage, Jacob D. Fairholm

Theses and Dissertations

Viral protein r (Vpr) of Human immunodeficiency virus type 1 (HIV-1) plays an important role in the ability of the virus to infect cells and cause disease. Two polymorphisms to Vpr have been shown to result in differences in disease progression in infected individuals. R36W tends to result in rapid disease progression while R77Q results in long-term non-progression. In order to better understand how these polymorphisms result in these different disease phenotypes, our lab has recently shown that in cell culture, the R36W polymorphism results in increased viral replication and greater induction of cell death. On the other hand, infection …

Catharanthine Modulates Mesolimbic Dopamine Transmission: A Potential Treatment For Alcohol Use Disorder, Benjamin M. Williams

Theses and Dissertations

Catharanthine is derived from the Catharanthus roseus plant and is an analog to ibogaine, a drug that reduces opioid and alcohol withdrawal symptoms and decreases drug self-administration in both animals and humans. Catharanthine has promise to be an alternative pharmacological treatment for addiction without the adverse side effects associated with ibogaine. The objective of this study was to evaluate catharanthine’s effects on dopamine (DA) transmission in the mesolimbic DA system as well as determine its effects on both ethanol withdrawal induced anxiety and drug-seeking behaviors in mice. We hypothesized that catharanthine would inhibit evoked DA release in the nucleus accumbens …

A Comprehensive Phylogeny Of Stick And Leaf Insects (Insecta: Phasmatodea) Reveals Widespread Taxonomic Incongruence, Jackson B. Linde

Theses and Dissertations

Stick and leaf insects (Insecta: Phasmatodea) are a mesodiverse order of insects distributed across the world. These masters of masquerade crypsis are riddled with analogous morphological characters and lack a robust taxonomic framework. It seems that convergent evolution and the re-evolution of complex traits like wings and ocelli is perhaps the rule rather than the exception in stick insects. To investigate the re-acquisition of traits in this unique study system, a robust phylogenetic framework is essential. Our analyses combine traditional Sanger data with a transcriptomic backbone to provide the most corroborated phylogenetic analyses to date. To accomplish this, we employ …

Acceptance Finds A Way: How To Teach And Use Evolution's Explanatory Power, Daniel George Ferguson

Theses and Dissertations

The theory of evolution is the central combing theory that brings together all the tenets of biology that bring about a solid understanding of life. It is also one of the most controversial scientific theories of all time and is widely rejected by about 40% of the general public in the United States. One of the biggest reasons for low evolution acceptance is the perceived conflict between evolution and religious beliefs. Educators and researchers have been working hard to improve how we teach evolution in the classroom; some methods, such as focusing on evolution knowledge, have shown to be mixed. …

Graduate Recital : Analysis Of Performed Works, Mary Morales

Theses and Dissertations

This independent study serves as an educational resource regarding the pieces which I performed for my graduate recital. It includes information about the works and their composers, as well as an analysis of each work that was performed, and overview of my experiences while learning the works. In my reflection of my experiences, I offer insight which may be used in the instruction of these works and advice for what students may find most difficult pertaining to them. This paper is organized in the program order of the recital. Each section will begin with information about the composers and historical …

A Phonological Analysis Of Asu, James Passetti

Theses and Dissertations

This thesis provides an analysis of the phonology of Asu, a small and endangered Nupoid language of Nigeria. The corpus of data used for the analysis comes from more than two hours of recordings of a word list for the language, provided to me by the historian and anthropologist Constanze Weise.

The Asu language recognizes only two syllable structures, CV and CGV. The only syllables without onsets are formed by four noun class prefixes [è-,ē-, à-,ā-], that create Asu nouns without onsets word-initially.

The phonemic inventory of consonants consists of seven pairs of corresponding voiced-voiceless obstruents at the labial, alveolar, …

Cytochrome C: A Potential Early Biomarker Of Diabetic Retinopathy, Ileana G. Villarreal

Theses and Dissertations

Diabetic retinopathy is an ocular disease which appears in patients who experience progression of diabetes mellitus over a continuous period. Oftentimes, patients go undiagnosed due to the fact that there is no way to determine when the exact moment a patient develops diabetic retinopathy. Ophthalmologists and other eye specialists diagnose a patient with diabetic retinopathy once the patient begins to show progressed symptoms of the disease. Various experiments have been previously performed to increase our knowledge of the connection of diabetic retinopathy and early biomarkers of the disease. Several studies have determined the effects of diabetic retinopathy and apoptosis with …

Synthesis And Processing Of Polymeric Materials For Hydrogen Storage, Dominic Adrewie

Theses and Dissertations

Hydrogen is one of the most promising alternatives and clean fuel sources, but it has faced several hurdles due to storage and transportation issues. Several methods have been proposed, developed, and are being improved. Key among these is the use of polymers as safe hydrogen storage media.

This work investigated the polymerization of methyl vinyl ketone using different concentrations 2,2’-Azobis(2-methylpropionitrile) as the initiator in a free radical polymerization mechanism. There was a subsequent analysis of the effect of the initiator concentration on the conversion rate and the molecular weight of the polymers produced with the help of Gel permeation chromatography. …

A Small Wolf Eats A Large Apple: An Experimental Investigation Of The Temporal Processing Of Conceptual Magnitudes, Carolina Alvarez

Theses and Dissertations

When individuals are presented with two options and are asked to select the conceptually larger item, a size congruity effect is usually observed. A size congruity effect is present in comparison tasks when congruent stimuli, whose physical size and conceptual size match, are compared much faster than incongruent stimuli, whose physical size and conceptual size do not match. The current study used images and words as stimuli to investigate the two competing hypotheses for the size congruity effect using delta plots. Positive delta plots were observed when response time for incongruent items was compared to congruent items, providing evidence of …

De Novo Transcriptome Analysis Of Orange Jasmine (Murraya Paniculata) Infected With Citrus Greening Disease, Jeffrey Aquino Gomez

Theses and Dissertations

Citrus greening disease, also known as Huanglongbing, is one of the most devastating citrus diseases in the world. Candidatus Liberibacter asiaticus (CLas) is a non-culturable, phloem-limited bacterium that serves as one of two vectors for the transmission of any of the three kinds of greening disease. In cooler climates, the African variant transmitted by the African citrus psyllid (Trioza erytreae) is more prevalent. The Asian form transmitted by the Asian citrus psyllid (Diaphorina citri) where is predominant in warmer conditions and recently discover the American form who is also transmit by Diaphorina citri, was discover in Brazil but has also …

Tracking Control Of Quadrotors, Shihab Ahmed

Theses and Dissertations

In this thesis, the tracking control problem of a 6 DOF quadrotor is considered, and different control method is proposed considering optimal control, parametric and nonparametric uncertainty, input saturation, and distributed formation control. An optimal control approach is developed for single quadrotor tracking by minimizing the cost function. For uncertainties of the dynamic system, a robust adaptive tracking controller is proposed with the special structure of the dynamics of the system. Considering the uncertainty and input constraints, a robust adaptive saturation controller is proposed with the aid of an auxiliary compensated system. Decentralized formation control method for quadrotors is presented …

Effects Of Macronutrients Intake And Physical Activity On Childhood Obesity Of Hispanic Children, Prosanta Barai

Theses and Dissertations

Obesity has become more ubiquitous during the past few decades, and still, its prevalence is increasing. It is in every population in the world and all regions, including rural parts of low and middle-income countries. In the USA, regardless of age, the severity of obesity is no different from the global trend. Although numerous pieces of literature are available, that tried to find answers to some pressing issues like how obesity can be controlled, but there is little to no study focused on younger children, especially the 4-6-year-old Hispanic population. Our study aimed to determine the causal path among literature …

Cinematic Poe: A Survey Of Films Inspired By Edgar Allan Poe And Their Importance In Film History, Devon V. Bradley

Theses and Dissertations

The relationship of Edgar Allan Poe’s works, their respective adaptations, and their place in film history remains underappreciated in contemporary scholarship. Additionally, many of the most significant director/auteurs in cinema history have Poe inspired films. This project explores the filmic legacy Poe and his stories share across a survey of significant filmmakers, who have created memorable interpretations of Poe’s works. This thesis seeks to consider connections between several well-known Poe film adaptations and what I consider to be their significance in the development of film as a medium over its history. My investigation compares a range of films inspired by …

Red Drum (Sciaenops Ocellatus) Trophic Web Reconstruction Using Stable Isotopes In Two Systems In The Northwestern Gulf Of Mexico, Elizabeth Mogus Garcia

Theses and Dissertations

Estuaries act as nurseries for many important fishes, including predators like Red Drum (Sciaenops ocellatus). Using gut content and stable isotope analyses to better understand juvenile S. ocellatus’ diet and role within the trophic web, a full year of data was collected on a quarterly basis to illustrate a change in diet based on resource availability at two study sites and for two non-overlapping S. ocellatus sizes. Panopeidae and Penaeidae were the most abundant prey items found in S. ocellatus stomachs for both sizes, sites, and four quarters representing over 50% of the diet. Stable isotope analyses …

Assessing Intra-Urban Particulate Matter (Pm2.5) Concentrations At The Lower Rio Grande Valley (Rgv), South Texas, Usa, Using Low-Cost Sensors, Esmeralda Mendez

Theses and Dissertations

Rapid technological developments of novel low-cost air quality sensors enable long-term ambient monitoring in neighborhood areas. In this study, spatial and temporal trends are analyzed by localized level monitoring with low-cost sensors (TSI BlueSky Air Quality Monitor). Eleven low-cost sensors were deployed across the Lower Rio Grande Valley, South Texas region: Brownsville, Edinburg, Weslaco, and Port Isabel. 24-hour PM2.5 concentrations are correlated with PM2.5 from existing Texas Commission on Environmental Quality (TCEQ) Continuous Ambient Monitoring Stations (CAMSs) to express temporal and spatial heterogeneity from March 01, 2021, to March 31, 2022. Results indicated the deployed low-cost sensors as a better …

Revealing The Effects Of Climate Change And Fungicides On Soil Microbial Communities In The Lower Rio Grande Valley, Texas, Armida Rivera

Theses and Dissertations

Fungicide applications are effective to prevent fungal pathogens that are known to cause crop damage and decrease yields. However, these pesticides can exert toxic or inhibitory effects on non-targeted organisms such as soil microbial communities. In addition, it is unknown to what extent shifts in temperature and soil moisture resulting from global climate change, alter the activities of non-targeted soil organisms. The aim of this study was to evaluate soil biological parameters such as soil respiration and enzyme activities involved in the cycling of carbon, nitrogen, and phosphorous (Beta-glucosidase, Fluorescein Diacetate (FDA) Hydrolysis, urease, alkaline phosphatase, acid phosphatase, and N-acetyl-Beta-glucosaminidase) …

Examination Of The Realized Host Range Of North American Lacebug (Gargaphia Arizonica Drake & Carvalho) And Texas False Potato Beetle (Leptinotarsa Texana Schaeffer) As A Potential Biocontrol Agents For Silverleaf Nightshade (Solanum Elaeagnifoli Cav.), Samikshya Subedi

Theses and Dissertations

Silverleaf nightshade (Solanum elaeagnifolium Cav.) is a perennial forb native to South Texas and Central and South America, but it has become a serious agricultural weed across the world. Because silverleaf nightshade (SLN) is difficult and expensive to manage using chemical and mechanical controls, there is growing attention and research focused on biological control options. In this project, we used both field and laboratory studies to examine the suitability of two North American insects, namely North American lacebug (Gargaphia arizonica Drake & Carvalho) and Texas false potato beetle (Leptinotarsa texana Schaeffer) as prospective biological control agents for …