Digital Commons Network^™

Ecological Impacts Of Anthropogenic Chemicals On Non-Target Species And The Role Of Plant Diversity In Ecosystem Restoration And Resilience, Shiva Torabian

Electronic Theses and Dissertations

Understanding ecosystem processes in rangelands is of paramount importance for ensuring global food security, given their pivotal role in sustaining forage and livestock production. Central to this understanding are fundamental processes such as nutrient cycling, decomposition, and plant biomass dynamics. However, the use of anthropogenic chemicals in agricultural practices has the potential to exert significant influence on these critical ecosystem functions. A pivotal factor in this context is the plant diversity inherent to these rangeland ecosystems. Plant diversity not only provides essential ecosystem functions but also enhances them with the capacity to withstand and recover from perturbations. Ecosystems characterized by …

Enhancing Nitrogen Use Efficiency Through Ai-Powered Image Analysis And Innovative N-Rich Spot Method, Bobby Azad

Electronic Theses and Dissertations

This study conducted in 2023 aimed to enhance nitrogen use efficiency (NUE) in wheat and corn grown in South Dakota. Based on dynamic weather conditions and other factor interactions, conventional nitrogen (N) recommendations need to be improved. Soil properties information, including electrical conductivity, was used to create management zones. In each zone, three N-rich spots were established as biosensors. Drones and satellites collected imagery data, and an AI-driven approach assessed the crop response to applied N. A dynamic N application approach, integrating aerial data with historical records, was developed and evaluated. Our methodology, at a 95% confidence level, resulted in …

Characterizing Vaginal Gene Expression In Prepubertal Gilts, Shannon Lee Dierking

Electronic Theses and Dissertations

The best-known predictor of reproductive success in gilts is the age at puberty. Early puberty (i.e., d170 – d180 of age) is associated with improved long-term reproductive performance and more full value offspring for market. The ability to predict, in the prepubertal stage, the age that a replacement gilt would be expected to achieve puberty has great reproductive and economic advantages. This work focuses on identifying biological markers that are potentially predictive of age at puberty. Study 1 identified changes in the vaginal epithelium during gilt reproductive development. Pre-pubertal gilts (n =13) were followed from d70 of age until first …

Investigating Dormancy And Germination Characteristics To Promote Restoration Success In The Northern Great Plains, Gregory A. Cooper

Electronic Theses and Dissertations

Failures in seed-based restoration can be partially attributed to a lack of knowledge on seed dormancy. Dormancy is beneficial for plant establishment in unpredictable environmental conditions, but a lack of uniform germination can hinder restoration efforts. The purpose of this research was to gain a better understanding of dormancy displayed by select forbs of the northern Great Plains. The first data chapter attempted to identify and break dormancy class. Seeds were treated with scarification, smoke, and fertilizer pretreatments in an attempt to break seed dormancy. Seeds were also placed in spring and summer temperatures to identify how seasonal phenology influenced …

Culture Care Values And Beliefs Of Puerto Rican Adults Related To Suicide: An Ethnonursing Study, Griselle Estrada

Electronic Theses and Dissertations

BACKGROUND: Suicide is a public health issue among the growing U.S. Latinx population; however, Latinx subgroups are diverse and represent different cultural backgrounds. Puerto Ricans are the second largest Latinx subgroup in the nation. Although research points to possible mental health vulnerabilities among Puerto Ricans when compared to other Latinx subgroups, there is a dearth of research exploring cultural influences that can impact suicide prevention efforts for Puerto Ricans living in the U.S. mainland. AIMS: This study aimed to explore the culture care values, beliefs, and needs of Puerto Rican adults pertaining to suicide and its prevention. METHODS: The …

Technological Content Knowledge And Technological Pedagogical Knowledge In Secondary Science Teachers: A Mixed Methods Analysis, Stefanie Graban

Electronic Theses and Dissertations

Teachers in K-12 education are increasingly using technology in their courses. However, teachers may struggle to implement technology effectively in their specific subject areas. Existing research demonstrates that there was a need to better support in-service science teachers’ technological content knowledge. Accordingly, the purpose of this practitioner research study was to examine how, why, and to what extent in-service secondary science teachers report using technology as part of instructional practices. The TPACK framework was used as the theoretical lens for a mixed methods study exploring secondary science teachers’ technological pedagogical knowledge (TPK) and technological content knowledge (TCK). Multiple data sources …

Adaptive Microlearning: An Empirical Study Among The Students In The Rural Areas Of China, Jingwei Liu

Electronic Theses and Dissertations

Through multiple educational reforms, China has pursued developing well-rounded learners with solid content knowledge, higher-order thinking skills, and the ability to transfer knowledge to real-world problem spaces. The imbalance of learning resources between urban and rural China, however, has caused disadvantages for learners in rural China to gain access to quality educational opportunities necessary for becoming well-rounded learners. Luckily, the quickly growing Internet service coverage in rural China makes educational interventions possible. Online intervention aiming for many qualities of well-rounded learners, such as deeper learning, is particularly promising.

The purpose of this study was to investigate the potential of adaptive …

Assessments Of Water Chemistry And Fish Community Structure In The Buffalo Creek Watershed, Tributary To The Allegheny River In Armstrong And Butler Counties, Pennsylvania, Kathleen Wilson

Electronic Theses and Dissertations

The Buffalo Creek watershed has experienced water quality impairments for various reasons, including but not limited to, agricultural influence, abandoned mine drainage (AMD), on-site wastewater malfunction, and stormwater. The source and cause of the most prevalent impaired areas remains unknown. The goal of this study was to analyze water chemistry using state water quality standards and mass ratio analysis, then to conduct fish community analysis. We found toxic metal pollution across the watershed, with iron, cadmium, copper, and selenium frequently exceeding criteria. We determined which streams are polluted by resource extraction activities by conducting mass ratio analysis. We found conventional …

The Health And Health Care Needs And Experiences Of Mexican Heritage Individuals In A Nonmetro Location: An Ethnonursing Study, Karla Adu

Electronic Theses and Dissertations

Introduction: The population of Mexican heritage individuals has grown significantly in nonmetro, emerging communities. The purpose of this study was to explore the health and health care needs and experiences of this population in the Midwest. Methods: Leininger’s Culture Care Theory and Ethnonursing Research Methods were used as the guiding theory and methodology for the qualitative study. Interviews were conducted with 27 informants. Recordings were transcribed and analyzed according to Leininger’s phases of data analysis. Results: Three themes emerged from the data: 1. living a better life in a nonmetro community with and for family, 2. barriers to understanding …

Revelations In The Blood: Determination Of Biomarkers And Analytes, Jeremiah Jamrom

Electronic Theses and Dissertations

Changes in body chemistry have long been utilized as a tool for medical diagnosis. Whether blood panel, toxin level, antigen testing or any of the myriad other tests performed annually, searching for molecules which confer health status is a long-established practice. These tests give physicians more information and allow them to make a more accurate diagnosis, from which appropriate treatment can stem. Awareness of, and the subsequent search for, biomarkers for disease states have grown substantially in the past years as analytical, biochemical, and instrumental techniques have become more precises and powerful. In an era of increasingly personalized medicine, novel …

Speciated Isotope Dilution Mass Spectrometry In Combination With Thor’S Hammer Metaspike Technology For The Assessment Of Low-Level Biomarkers For Human Health Evaluation, Ashley Ebert

Electronic Theses and Dissertations

Our research team has been focused on quantifying important biological analytes in human blood samples to delineate the biochemical processes underlying certain states of dysfunction and evaluate treatment efficacy. These efforts have been guided by laboratory measurements with the input of medical experts. Speciated isotope dilution mass spectrometry (SIDMS) explained in detail in EPA Method 6800 has been successfully applied in the quantification of an important biomarker analyte for immune function and detoxification processes: glutathione. Past research has proven the molecule a biomarker for autism spectrum disorder (ASD) in the form of the reduced/oxidized glutathione (GSH/GSSG) ratio, and literature has …

Perspective Of Nyerere On Self-Reliance: A Transformational Rhetorical For Liberating African Identity In Tanzanian Context, Ayub Mwampela

Electronic Theses and Dissertations

Julius Kambarage Nyerere (1922–1999) was the first president of Tanganyika in 1961 and the founding father of the United Republic of Tanzania, after having merged Tanganyika and Zanzibar in 1964. He died from leukemia on October 14, 1999, in London. He was 77 years old. Among the most memorable events in the life of Nyerere is his involvement in the struggle for the freedom of African people from foreign influences.

The goal of this research is to ask and answer to the following question: How does the perspective of Nyerere on self-reliance contribute to the effort of liberating African identity? …

Quantum Computations And Molecular Dynamics Simulations: From The Fundamentals Of Antimicrobial Resistance To Neurological Diseases, Angel Tamez

Electronic Theses and Dissertations

Biophysical phenomena are modeled using a combination of quantum and classical methods to interpret and supplement three distinct and diverse problems in this dissertation. In the first project, decarboxylation reactions are ubiquitous across chemical and biological disciplines, yet the origin of non-catalytic solvent effects remains elusive. Specific solvent structure and energetics have not been well described for the monoanion of malonate, nor corrected from the gas-phase charge-assisted intramolecular hydrogen bond model known as “pseudochair”. In the aqueous phase, a low-lying energy conformer known as the “orthogonal conformation” is computed to be preferred by a three-water cluster of hydrogen bonding over …

Facial Expression Recognition Deficits In Autism Spectrum Disorder, Zachary Friedman

Electronic Theses and Dissertations

Autism Spectrum Disorders (ASD) are an umbrella term for lifelong neurobehavioral disorders characterized by a set of social (verbal and nonverbal) communication challenges and behaviors and restricted, repetitive behaviors. Emotions serve many functions, but primarily they help with the appraisal of stimuli and driving of responses. Emotional processing and facial recognition are integral abilities that influence the acquisition of social skills. For individuals with ASD, it is hypothesized that facial recognition deficits contribute to social communication traits. The bulk of previously conducted research has utilized static images of facial expressions. This study utilized videos of spontaneous expressions. Participants were tasked …

Tabletop Role-Playing Games As Autism Psychotherapy: A Video-Cued Multivocal Clinical Ethnography, Adina Rubin-Budick

Electronic Theses and Dissertations

This qualitative study is a video-cued multivocal ethnography that analyzed the clinical reasoning and perspectives of psychotherapists using Tabletop Role-Playing Games (TRPG) as a therapeutic treatment for children and adolescents diagnosed with Autism Spectrum conditions. With a growing number of TRPG therapists nationwide using this modality in their clinical practices, this study aimed to develop a clearer understanding of the ways in which their therapeutic orientation, gaming practices, and knowledge of Autism Spectrum Conditions informs their use of TRPG psychotherapy with Autistic clients.

Research that focuses on clinical decision-making and the knowledge that informs clinical interventions and technique generally refers …

Person-Centred Care And Health Justice In A Multicultural World: Holistic Perspectives From Context, Care, And Capabilities, Asmat Ara Islam

Electronic Theses and Dissertations

Medical ethicists debate whether “one-approach-fits-all” is specifically a problem for disease-oriented paradigms. In developed countries, health systems have adopted limited person-centred care (PCC) paradigms, most of which focus only on patient autonomy. However, these models neither adequately respond to a nexus of relevant aspects, including patients’ vulnerability, needs, and capabilities, nor provide adequate justification that PCC is related to social justice. The central question of this dissertation is: how does a PCC framework that is based on the capabilities approach justify a shift in the current health system toward PCC so that health systems can address health injustices in a …

Distribution And Soil Characteristics Associated With The Neches River Rose-Mallow (Hibiscus Dasycalyx), Morgan E. Langlinais

Electronic Theses and Dissertations

The Neches River rose-mallow, Hibiscus dasycalyx, is a rare herbaceous perennial endemic to East Texas. The threatened, obligate wetland species is currently at risk of being lost in the wild due to habitat loss, encroachment of nonnative and native plant species, and hybridization with two other Hibiscus congeners, Hibiscus laevis and Hibiscus moscheutos. Known locations of each of the three Hibiscus species were used to measure select soil characteristics and habitat variables associated with each of the rose-mallows. H. dasycalyx was concluded to be associated with more fertile soils and slightly more canopy coverage than H. laevis and …

Microplastic Accumulation In The Digestive Tract Of Young-Of-Year Atlantic Sharpnose Sharks (Rhizoprionodon Terraenovae) In The Grand Strand, Sc, Andrew Curtis Sitlinger

Electronic Theses and Dissertations

This study focused on the presence and accumulation of microplastic fibers in the digestive tract and livers of young-of-year Atlantic Sharpnose Sharks (Rhizopriondon terraenovae) from two sampling locations along the Grand Strand of South Carolina. R. terraenovae is a small, mesopredatory elasmobranch found abundantly along northwestern Atlantic Ocean coastlines. Thirty specimens of R. terraenovae were collected from May through August of 2020. Microplastics were found in all specimens. A total of 672 plastic particles were identified over the course of the study, with an average of 22.4 ± 10.5 (SD) plastics per specimen. The majority of the plastics were classified …

Silting Dynamics And Metal Contaminants In The Georgetown Inner Harbor, Ezekiel Wil Meyers

Electronic Theses and Dissertations

The Georgetown inner harbor is an abandoned oxbow-like river loop and a vital historic site with a wealth of traditional businesses and heavy local industry located within Winyah Bay. Since the modification of the Sampit River in 1949, chronic rapid silting has plagued the inner harbor. With these substantial amounts of fine-grained material accumulating inside the inner harbor, business operations along the waterfront, navigational and maritime operations, and contamination within the harbor are of major concern. The goals of this study were to (a) understand the silting dynamics inside the inner harbor, (b) identify heavy metals which might be of …

Fine-Scale Site Selection Of Strand-Feeding Common Bottlenose Dolphins (Tursiops Truncatus) And Their Prey, Deborah Kleinclaus

Electronic Theses and Dissertations

Strand-feeding is a unique, cooperative foraging strategy used by some common bottlenose dolphins (Tursiops truncatus) at low tide in South Carolina and Georgia salt marshes, where a group of dolphins charges schools of fish, thrusting them onto the bank with their bow wave and then capturing prey items onshore. Strand-feeding dolphins are estuarine residents and frequent predictable stranding sites, suggesting an intimate knowledge of the area. Dolphin behavior prior to stranding suggests they do not herd the fish before charging, but instead prey on fish already shoaling near the bank. The use of active acoustics from strand-feeders in order to …

Next-Generation Sequencing Shows Increasing Temperatures Affect Stream Fungal Communities, Regan Hodgson

Electronic Theses and Dissertations

Under climate change predictions, surface air temperature is expected to continue to rise and will likely affect functioning of stream ecosystems and microbial communities. Aquatic hyphomycetes are key fungal decomposers of plant litter in headwater streams controlling carbon, energy, and nutrient flows to higher trophic levels. This project addressed the effects of temperature on stream fungal communities in two recently conducted experiments (microcosm and streamside channel studies) using Illumina sequencing. The objectives were to determine (1) if temperature affects community structure of stream fungi based on relative abundances of ITS2 rDNA sequences, (2) if the effects of temperature on aquatic …

Abundance And Growth Of Juvenile Atlantic Sturgeon In The Edisto River, Sc, Molly Katherine Takacs

Electronic Theses and Dissertations

Information on abundance and body growth are important for understanding the status and health of populations, and this information can be used to guide and monitor conservation and recovery efforts for species of conservation concern. The Atlantic Sturgeon (Acipenser oxyrinchus oxyrinchus) is an anadromous fish native to the Atlantic coast of the United States and Canada. Due to overfishing and habitat degradation, population levels declined, and Atlantic Sturgeon were placed on the Endangered Species list in 2012. Although there is substantial research on adult Atlantic Sturgeon, knowledge about their early life history is lacking. The objective of this study were …

Extraction, Analysis, And Comparison Of Microplastics In Sc Marsh Substrates, Austin G. Sige

Electronic Theses and Dissertations

The global, rapid increase in plastic production is a widespread problem for coastal environments such as marshes that present favorable conditions for plastic retention. This study looked at the microplastic abundance within three previously unstudied South Carolina marshes located in Myrtle Beach, Murrells Inlet, and Waties Island. A comparison between the microplastic types and abundances between locations provided knowledge about the impacts of sediment composition (sand, silt, clay, and organic matter) on microplastic sequestration. This study also produced a novel microplastic extraction methodology for cohesive marsh sediment that used elutriation to effectively break apart aggregates prior to chemical digestion and …

A Comparison Of Logistic, Ridge, And Lasso Regression With Heart Failure Risk Data: Effects Of Sample Size, Predictor Correlation, And Predictor Weight On Outcome Accuracy, Mahmoud M. Aljuhani

Electronic Theses and Dissertations

Logistic Regression (LR), LASSO regression, and RIDGE regression are standard classification techniques for predicting a dichotomous output. Since these methods are applied for similar purposes and have different features, it is crucial to evaluate the performance of these methods under different controlled conditions. With this information, researchers can apply the optimal method for specific conditions.

Following previous research, which reported the effects of conditions such as sample size and multicollinearity on the performance of the classification methods, this research focused on the effects of when sample size, level of predictor collinearity, and predictor variable weight are controlled on the performance …

Sequencing And Functional Characterization Of A Latrodectus Geometricus Defensin, Lg-Defensin, Jacklyn Victoria Thompson

Electronic Theses and Dissertations

Defensins are small, cysteine-rich, immune related proteins described to be the most widespread family of invertebrate antimicrobial peptides. Presently, there is limited information regarding spider defensins. In this study, a new defensin peptide was described in Latrodectus geometricus, Lg-defensin. The full open reading frame was resolved using RACE and de novo assembly, followed by a bioinformatical analysis and phylogenetic alignment to determine conserved sequence patterns and structural similarities to other defensins. Next, the functionality of Lg-defensin was determined using in vitro RNA interference to assess what impact silencing had on the spider’s ability to control a gram-positive and gram-negative bacterial …

Turning Ligands On Their Side: Computational Investigation Into The Binding Of N2o And N2 In Transition Metal Complexes, Cole Donald

Electronic Theses and Dissertations

Common greenhouse gas nitrous oxide (N₂O) is a thermodynamically potent and environmentally benign oxidant, making it a desirable target for metal center activation. Unfortunately, N₂O is a poor ligand for transition metals due to its weak sigma-donating and pi-accepting properties; as a result, few transition metal complexes capable of interacting with N₂O have been found. As the primary source of all nitrogen in organisms, abundant gas dinitrogen (N₂) is a crucially important tiny molecule and an essential part of daily existence. However, due to its inertness, it has limited practical uses in …

Effects Of Prescribed Fire Regimes On White-Tailed Deer (Odocoileus Virginianus) Browse, Forage, And Nutrient Availability In The Pineywoods Ecoregion Of Texas, Wyatt L. Bagwell

Electronic Theses and Dissertations

Fire is a management tool for white-tailed deer (Odocoileus virginianus) habitat, influencing browse availability, herbaceous production, and nutrient content. In 2020 and 2021, this study utilized 46 plots across East Texas to assess these habitat components. A stem count index survey method was used to assess browse utilization prior to April in both years, and preferred browse species were clipped and analyzed for nutrient availability, and herbaceous production was also measured. Additionally, white-tailed deer population data, browse survey data, and recent fire history were obtained from five different wildlife management areas to examine their relationship. Deer had preferences …

Examining The Effects Of Npra Antagonist Anantin On Sci-Induced Ployuria., Lindsey Zipperer

Electronic Theses and Dissertations

Polyuria, or the over production of urine, is a prevalent condition that significantly impacts the quality of life in individuals suffering from a spinal cord injury (SCI). Post-SCI induced polyuria is thought to have been associated with altered levels of vasopressin (AVP), atrial natriuretic peptide (ANP), and natriuretic peptide receptor A (NPRA). In the present study, the function of NPRA was analyzed in the rat contusion model using anantin, an NPRA antagonist. A daily dose of either 100 µg of anantin or vehicle was administered intraperitoneally immediately following the SCI surgery and continued until termination, 4 weeks post injury (wpi). …

Academic Achievement And Degree Attainment Among College Students With Children., Katrina Elliott

Electronic Theses and Dissertations

Using data from the Beginning Postsecondary Students Longitudinal Study (BPS) (National Center for Education Statistics, n.d.) from 2012 to 2017 acquired by the National Center for Education Statistics (NCES) survey program, this study addresses the research questions of whether there is a difference in degree attainment of earning a bachelor’s degree in the time period from 2012 through 2017 and whether there is a difference in academic achievement as defined by students’ grade point average between students who have dependent children and those who do not have dependent children between the ages 18 to 29 attending a four-year institution after …

La Casita Center: An Accompaniment Based Approach To Social Justice And Social Service., Ben Harlan

Electronic Theses and Dissertations

La Casita Center is a Louisville based nonprofit organization that accompanies Latinx immigrants in the Louisville Metro area. and that is led and staffed by Latina immigrants. In this thesis, I investigate how employees of this Latinx-immigrant led nonprofit organization, navigate challenges to both administer service and build community using the model of accompaniment. Organizations like La Casita are critically important for Latinx newcomer communities in the United States and as neoliberal and nativist-inspired policiescontinue to oppress and marginalize, La Casita provides a model for what it means to center inclusion, belonging, community, and solidarity. In a global landscape of …