Digital Commons Network^™

Dynamic Soil Properties In The Lower Rio Grande Valley: Carbon And Nitrogen Responses To Different Tillage Practices, Luzyannet Ballesteros Gonzalez

Theses and Dissertations

There has been increased attention in utilizing agriculture for carbon sequestration. Soil carbon and nitrogen are two dynamic soil properties (DSPs) that are indicators of soil health and function and have overlapping cycles. These soil properties change frequently as a result of environmental conditions and agricultural management practices. This study focuses on the impact of tillage practices in unirrigated agricultural fields in Hidalgo and Willacy counties located in South Texas on Hidalgo Sandy Clay Loam; With a particular focus on Soil Total Carbon (TC), Soil Inorganic Carbon (SIC), Permanganate Oxidizable Carbon (POXC), Carbon and Nitrogen ratio (C:N), Soil Organic Matter …

Wildlife Road Mortality Patterns In South Texas And Survey Methodology Improvement, Bradley E. Beer

Theses and Dissertations

Mortalities of wildlife caused by collisions with vehicles along roads are increasing in prevalence, threatening the existence of various species and populations. A better understanding of how mortalities change in response to natural and anthropogenic variables and efficient methods of obtaining mortality data are essential to mitigating such mortalities. This thesis investigates several key elements to improving road mortality surveys in south Texas. First, it was found that road mortality survey counts did not change under a pandemic-related lockdown and that 2 mortality survey observers detect more mortalities than 1. Analysis of brown pelican groundings on Texas State Highway 48 …

The Molecular Evolution Of Insect Opsin Genes, Maria Jose Cardenas Muedano

Theses and Dissertations

Opsins are part of the superfamily of G-coupled receptor proteins and together with chromophores, are responsible for initiating the signal transduction cascade responsible for animal vision. Since opsins have a critical role on visual perception these genes are crucial for a myriad of adaptive traits and behaviors and should show diverse signs of natural selection at the molecular level. Understanding the evolution of opsins across the wide diversity of insect groups will allow us to better understand the evolutionary pressure on insect opsins and serve as a model for both other gene systems and other taxonomic groups of animals that …

Winds & Waves: A Collection Of Short Stories & Poems [Vientos Y Olas: Una Colección De Cuentos Y Poemas], Joann Balderrama

Theses and Dissertations

Winds & Waves: A Collection of Short Stories & Poems, presents works of fiction telling a cohesive story with themes of survival, joy in simplicity, and resilience. My work will show the gradual exposing of moods as well as experimentation with writing techniques in several genres. My writing has developed to include a voice of introspection.

My thesis title includes winds and waves to signify change and transformation. They also refer to the movement in nature. Nature is included in a lot of my pieces. Water is an important symbolic component in several of the pieces as well.

Being …

My Journey As An Elementary Science Teacher: From Linear To Authentic, Johanna Lynn Esparza

Theses and Dissertations

The purpose of this dissertation is to provide a personalized narrative of one science teacher’s use of reflexive teaching as an agent of change. This dissertation is about a journey of change in instruction fostered by a change of identity as a science teacher, using the butterfly cycle as a metaphor. This dissertation narrates the identity evolution of the teacher. This study has relevance because the process utilized by the teacher provides a method of self-examination and identity construction for other elementary science classroom teachers who want to improve their science practices. This study also has relevance because it describes …

Monsters & Men, Christopher Ernest Garcia

Theses and Dissertations

Monsters & Men is a collection of poetry and illustrations that explores the complex emotions associated with masculinity, grief, and personal development. I achieve this by heavily reflecting on my relationship with my late father and using this medium as an outlet to express my trauma in a healthy manner. How we perceive ourselves as men, and what is possible, is not reflected enough in society and I aim to be a proponent in stimulating the conversation revolving around men’s mental health. Men and the patriarchy impose themselves on others to the point where we need to address the unethical …

Emotion Identification Ability And Perspective-Taking In Children With Autism Spectrum Disorder, Ana Lucia Garrido Huerta

Theses and Dissertations

Autism spectrum disorder (ASD) is characterized by persistent deficits in social interaction. Perspective-taking and emotion identification are important skills to develop appropriate social interactions. Previous research has shown that children with ASD may lack the ability to relate emotionally to others. Research has also shown a deficit in perspective-taking skills in children with ASD. The selected studies reviewed in this thesis analyze seven articles that show research on children with ASD regarding their emotional identification and perspective-taking skills. Articles searched under the words “emotion identification,” “perspective-taking,” and “autism” obtained from the Psychology and Behavioral Sciences Collection using the EBSCO database …

Salas Y Gómez Benthic Habitat And Community Assessment Of Seamounts And Oceanic Islands, Kara Eckley

Theses and Dissertations

Seamounts are essential benthic habitats that are ecologically important, providing habitat and functioning as stepping stones for dispersal and possible refugia, and economically valuable, supporting deep-sea fisheries and potential mineral mining activities. The Salas y Gómez Ridge in the southeast Pacific Ocean longitudinally contains dozens of seamounts that extend ~2,900 km across the South Pacific Subtropical Gyre. The ridge contains a range of oxygen and nutrient conditions that, along with the distance between seamounts, have led to high levels of endemism, reported in the few studies that have been conducted on seamounts of the region; this study is the first …

Atomlbs: An Atom Based Convolutional Neural Network For Druggable Ligand Binding Site Prediction, Md Ashraful Islam

Theses and Dissertations

Despite advances in drug research and development, there are few and ineffective treatments for a variety of diseases. Virtual screening can drastically reduce costs and accelerate the drug discovery process. Binding site identification is one of the initial and most important steps in structure-based virtual screening. Identifying and defining protein cavities that are likely to bind to a small compound is the objective of this task. In this research, we propose four different convolutional neural networks for predicting ligand-binding sites in proteins. A parallel optimized data pipeline is created to enable faster training of these neural network models on minimal …

Development Of Vegetable Oil-Based Nano-Lubricants Using Ag, H-Bn And Mgo Nanoparticles As Lubricant Additives, Kollol Sarker Jogesh

Theses and Dissertations

Because of the harmful impact of petroleum-based lubricant on the environment and human body, vegetable oil-based lubricant with eco-friendly nanoparticles has a great potential to be an alternative lubricant if it possesses proper lubricating properties. In this study, thermal conductivity, viscosity and tribological properties (wear scar diameter and coefficient of friction) of vegetable oil-based nanolubricant, developed from soybean oil and sunflower oil, modified with Ag, h-BN and MgO nanoparticles as lubricant additives, were evaluated. For thermal conductivity evaluation, a line heat source method was used with KD2 Pro-Thermal Property Analyzer. For viscosity evaluation, Haake Mars 40-rheometer was used to evaluate …

Effects Of Roundup Exposure On Redox Status, Cellular Apoptosis, And Antioxidant And Osmoregulatory Enzyme Expressions In Goldfish (Carassius Auratus), Md Imran Noor

Theses and Dissertations

Intense anthropogenic activities of industrialized nations dramatically increase environmental pollution. This study focused on the effects of Roundup, a glyphosate-based herbicide, exposure (low- and high-dose: 0.5 and 5 mg/L for 2 weeks) on dinitrophenyl protein (DNP), nitrotyrosine protein (NTP), superoxidase dismutase (SOD), catalase (CAT), Na+ /K+ - ATPase (NKA), and renin expressions, and cellular apoptosis in the gills and kidneys of goldfish. Histopathological analysis showed widespread tissue damage in both gills and kidneys. Immunohistochemical analysis provided insights into the expression of molecular biomarkers in tissues. Fish exposed to Roundup exhibited a significant (P<0.05) upregulation in DNP, NTP, SOD, and CAT expressions, and apoptotic nuclei in both tissues. Additionally, exposure to Roundup significantly increased renin expression in kidneys and decreased NKA expression in gills. Overall, our results suggest that exposure to Roundup induces oxidative/nitrative stress and cellular apoptosis and alters osmoregulatory and antioxidant systems which may lead to impaired physiological functions in goldfish.

Incorporating Native Plants In Insectary Strips To Promote Insect Diversity And Below-Ground Beneficial Microbes In South Texas, Lindsey N. Richards

Theses and Dissertations

Farm edges are generally the most undisturbed areas in a farm with diverse vegetation and can enhance agrobiodiversity and provide crucial food and shelter for wildlife, insects, and soil biota. Planting native wildflowers with the ability to reseed and withstand local climatic conditions for semi-permanent vegetation around farm edges or in between crops has potential to biologically control pests. To test this, we ran a two-year study and installed three different flowering insectary strips on a certified organic vegetable farm in South Texas during the winter season. The treatments were: 1) a commercially sourced 17-species native wildflower seed mix; 2) …

Dismembering Monstrous Metaphors In Latinx Speculative Fiction, Danielle Garcia-Karr

Theses and Dissertations

U.S. public discourse and popular media are rife with monstrous metaphors of Latinxs. This thesis argues that these gothic monstrous metaphors construct an affective economy of fear, which results in material violence and the devastation of Latinx lives. I further argue that to intervene within this affective economy, Latinx authors write speculative fiction, employing critical race methodologies, to negotiate monstrosity in relation to citizenship. In other words, speculative Latinx authors disidentify with monsters and enact epistemic disobedience, problematizing the known and naturalized and delinking Latinx people from monstrous metaphors to interrupt cycles of fear and violence. In exploring this metaphoric …

The Effect Of Video Model Dosage And Self-Monitoring On Parent's Use Of Language-Promoting Behavior, Kacie Marie Mcgarry

Theses and Dissertations

Previous research has found a disparity between the language trajectories of children within a high, medium, or low-economic-status family. A relationship is reliably found between the language trajectory of toddlers and success throughout school. This study will evaluate a training package to teach parents to engage in behaviors that promote language and assess the training's short-term effect on the trajectories of children (i.e., growing language) within low-socioeconomic backgrounds. Specifically, experimenters will evaluate the impact of the dosage of video modeling, self-evaluation, and self-monitoring on the acquisition of the targeted skills. Data may suggest that the more accurate the individual is …

Brief And Extended Effects Of Modified Competing Stimulus Assessments, Soray Nicole Castro

Theses and Dissertations

Competing stimulus assessments (CSA) are pre-assessment tools that systematically identify stimuli associated with reduced problem behavior. The current study aims to evaluate the effectiveness of an augmented CSA containing components of prompted engagement and response blocking. Results indicated the augmented CSA effectively identified two additional competing items for two of the three participants following prompted engagement. We also evaluated the extended effects of the competing stimuli on item engagement and stereotypy for two participants. Stereotypy reductive effects are maintained for one of the four competing stimuli for Participant 2 and two of the six items for Participant 3.

Importance Of Light Activation For Plant Cryptochrome And Antibacterial Drug Delivery Strategies, Merfat Ahmed Hammad

Theses and Dissertations

The goal of this project is to investigate the benefits of applying light in different systems. In the first part, the magnetoreception process that occurs in the light activated cryptochrome of Arabidopsis Thaliana was investigated. In the second part, photo-carbon monoxide releasing molecules (photo-CORMs) were investigated for their antibacterial effect to develop biomedical strategies. Overall, this has been achieved in three different studies. The first study investigated if the forward lightdriven reaction is involved in the magnetoreception process or not in cryptochrome (CRY). To accomplish this, the plant seedlings were tested for 90 minutes as follows: 5 minutes in the …

Investigating The Role Of Cryptochrome Activity In Arabidopsis Plant And Blue Light Exposure In Saos-2 Cell-Mediated Mineralization, Maria Nijr Albaqami

Theses and Dissertations

Cryptochromes (CRYs) are flavoproteins that absorb blue light and are associated with the perception of electromagnetic stimuli in a variety of organisms including animals and plants. When exposed to blue light, CRYs undergo flavin redox cycles and form radical pairs intermediates that are assumed to be magnetically sensitive as predicted by the radical-pair hypothesis. However, it is unknown if CRYs fulfill the criteria to act as biological magnetosensors. In the first aim, Arabidopsis thaliana seedlings were exposed to blue light and a time-dependent weak magnetic field at radiofrequency (RF) of 7 MHz as a diagnostic tool to test the radical-pair …

On Clinical Use Of Infrared Cameras For Video-Based Estimation Of 3d Facial Kinematics, William Mackenzie Harrington

Theses and Dissertations

Neurological and neurodegenerative disorders such as Parkinson’s disease (PD), amyotrophic lateral sclerosis (ALS), and stroke can cause speech and orofacial motor impairments with devastating effects on quality of life. Analysis of orofacial movement provides vital information for early diagnosis and tracking disease progression, but current clinical practice relies on perceptual assessments performed by clinicians, which are unreliable and insensitive to early symptoms. New methods in machine learning have enabled automatic and objective assessment of orofacial kinematics from color and depth videos, hence we introduce MEADepthCamera, a mobile application for RGB-D video and audio recording and automatic estimation of 3D facial …

South Texas Wildlife Activity Across A Fragmented Landscape And Road Mitigation Corridor, Caitlin K. Brett

Theses and Dissertations

Wildlife crossing structures (WCS) and roadside fencing are commonly installed to mitigate habitat fragmentation, wildlife road mortalities, and other negative effects that roads can have on the surrounding landscape. Eight such WCS were constructed below Farm-to-Market (FM)106 in Cameron County, Texas, across a 16 km corridor transecting the Laguna Atascosa National Wildlife Refuge. These WCS, paired with adjacent roadside fencing, were intended to prevent road mortalities of the endangered ocelot (Leopardus pardalis) and to mitigate the barrier effect of FM106 on this and other meso-mammal species. This study will analyze camera trap data from roadside and habitat reference …

Ambient Air-Processed Cspbi3-Based Perovskite Solar Cell Via Semi-Sputtering Deposition And Numerical Studies Of Cs3sb2i9-Based Perovskite Solar Cell, Shamik Datta

Theses and Dissertations

Commercialization of Perovskite solar cells as a clean energy source can augment the reduction of carbon footprint. CsPbI3, a well-known perovskite material, has been synthesized in ambient air and high-humidity conditions and utilized as the active layer in a perovskite solar cell. The rest of the solar cell layers have been sputter-deposited. This solar cell with a p-i-n configuration ITO/NiOx/CsPbI3/ZnO/Au exhibited a champion efficiency of 3.7%. Nonetheless, lead incorporation in the conventional Pb-cation-based perovskites poses an environmental threat. The physical proximity of living organisms to lead point sources exhibits a wide spectrum of negative consequences. In this study, we have …

Grapefruit Peel Biochar Applications For Immobilizing Copper And Lead In Soil, Michael Alfredo Navarro

Theses and Dissertations

This study investigated the efficacy of grapefruit peel (GP) derived biochar materials (two pyrolysis temperatures 450°C and 800°C) as a potential adsorbent to immobilize heavy metal (copper and lead) in a local sandy loam clay soil. A batch adsorption test with heavy metal concentrations at 50 mg L-1, and 100 mg L-1 revealed that soil itself had the highest immobilization percentage compared to the GP biochars. A soil column experiment was conducted to determine how much the GP biochar samples and the tested soil will exhibit adsorptive characteristics for heavy metals when 50 ml of 50 mg L-1 copper or …

The Politics Of Sexual Assault On The Theatrical Stage: How Theatre For Social Change Challenges Systems Of Oppression, Gerry Rodriguez

Theses and Dissertations

The critical introduction analyzes how theatre has been used as a tool to directly address politics and influence social change. Augusto Boal’s Theatre of the Oppressed has been of particular importance and influence in contemporary theatre which directly mirrors the failures of society by representing the people who are most affected. The purpose of theatre for social change is to accurately represent oppression within communities and inspire audiences to play an active role in finding solutions for these oppressive systems once they leave the comfort of the theatre. The critical introduction is followed by the full-length play, Victim Does Not …

Mosaico De Fantasía: A Collection Of Microrrelatos And Short Stories, Jennifer Gutierrez

Theses and Dissertations

Art is subjective, as is the art of writing. Creating a piece of writing out of a fleeting thought is truly the most frightening yet fulfilling feeling there is for a writer. Entire universes with their own unique worlds, aesthetic verses littered with imagery to paint an intricate mental picture; each representing a brief scenario that my mind decided to fabricate out of nothingness. Though not everyone will love my work, my goal is to reach someone that might. Even if it’s just one person. I want them to read my work and think “This is pretty cool.” My …

The Relationship Between Hallucinations And Visuospatial Impairment Among Individuals With Dementia, Ruta Sohoni

Theses and Dissertations

Objective: This study examines the neuropsychological functioning, specifically using the Hooper Visual Organization Test (VOT), to understand the impact of hallucinations on the level of impairment in the visuospatial domain.

Method: Archival data obtained over three years from a total of 73 patients from the Health First Memory Disorder Clinic was used in this study. Participants were included in the study if they endorsed experiencing hallucinations, were given the VOT during their brief neuropsychological evaluation, and were diagnosed with dementia or unspecified neurocognitive disorder. The patient’s electronic medical record was used to retrospectively gather additional details regarding their hallucinations and …

Interconnected Precarity: A Contemporary Reframing Of Bodily And Earthly Health In Wendell Berry's The Unsettling Of America: Culture And Agriculture, Abigail Pinegar

Theses and Dissertations

Published in 1977, Wendell Berry's book The Unsettling of America: Culture and Agriculture gained widespread popularity. More than half a century later, many of the notions of the body and the earth presented in its seventh chapter, "The Body and the Earth," remain relevant and important for environmental discourse today. Berry's discussion of the body and the earth examines their mutuality and codependence from an ontological, theological, agricultural, and even biological perspective. The coupling of this text with Judith Butler's, Frames of War: When is Life Grievable? contemporizes his argument through its more socio-political and philosophical claims regarding life and …

Comparative Metabolites Profiling Of Sesamum Indicum Seeds In Context Of Their Origin, Processing And Biological Activity Using Bioinformatics Tools, Bishoy Fayez Abib

Theses and Dissertations

Sesame (Sesamum indicum), is a significant oilseed crop with great economical and nutritional value, encompassing a plethora of primary and secondary metabolites that exhibit pharmacological and therapeutic merits. The present study, using untargeted comparative metabolomics, aims to authenticate and classify sesame seed accessions from different countries of origin i.e., Egypt, Sudan and Nigeria, based on their metabolite variations and in relation to their biological activity and nutritional value such as mineral content. Also, to further assess the impact of processing on sesame’s nutritional value and biological activity using the industrial production of sesame paste as a case study. To achieve …

Hawthorne’S Human Nature And Sin: Criticisms Of Puritanism And Progressivism, Oscar Martinez

Theses and Dissertations

One of America’s greatest authors, Nathaniel Hawthorne lived in a time of rapid scientific, material, and intellectual advancement. However, unlike many of his peers who went all-in on utopian reform movements, Hawthorne took a cautious and reserved approach to progress even though he supported the idea abstractly. Using six tales written acrossHawthorne’s career, this work will examine what each has to say about Hawthorne’s belief in human nature and why he takes such a skeptical position against movements aiming to fundamentally reshape people and society. The tales from the 1830s, “The Gentle Boy,” “Young Goodman Brown,” and “The Minister’s Black …

Bioactive Self-Forming Hydrogels For Biomedical Applications, Kirstene Arcuino Gultian Giddings

Theses and Dissertations

Hydrogels are soft biomaterials that feature a wide range of physical and biochemical properties. Although highly versatile, hydrogels typically require an exogeneous input (e.g., light, pH, temperature) to form, and this limits their use to conditions where a catalyst is present. The goal of this dissertation is to expand the use of catalyst-based hydrogels by developing hydrogels with independently tunable properties which gel in situ without external stimuli. This new class of hydrogels was developed by first modifying macromers with norbornene (Nor) or tetrazine (Tet) moieties. Macromers containing Nor or Tet remain liquid when dissolved, and upon mixing self-form into …

The Ring Quarry Mining Complex: A Preliminary Archaeological Investigation Into Ancient Native American Sites In Northwestern New Jersey, Joseph D. Cusack

Theses and Dissertations

The Ring Quarry Mining Complex (RQMC) in northwestern New Jersey is an archaeological, Pre-Contact Native American mining and habitation complex. The RQMC was a primary source of tool stone in the Vernon Valley of New Jersey for thousands of years. Evidence of human occupation within the study area extends from the Paleoindian through the Contact Period. This study focuses on the ancient chert quarry and surrounding sites across a landscape making up a habitational complex.

The Development Of A Genomic Toolbox For Studying The Evolutionary Genetics Of Reptilian Lungs Using The Chicken Model, Logan Thomas Edvalson

Theses and Dissertations

There is a vast diversity in tetrapod lung branching morphology. Phylogenetically, much of the pulmonary diversity among vertebrates appears to arise from the way epithelial tubes branch or form saccular (cyst) structures. Fgf10 activity has been shown to play a critical role in regulating branch versus cyst morphology. We hypothesize that the species-specific differences in lung morphology may be primarily due to species-specific differences in Fgf10 expression. To test this hypothesis, we have performed bioinformatic analyses on the Fgf10 locus and have identified a conserved 11 kb noncoding region that potentially contains the Fgf10 lung enhancer. We are taking a …