Digital Commons Network^™

Assessment Of Water Quality And Remediation Of Heavy Metals In A Coastal System, Christiana Fumnanya Eziashi

Theses and Dissertations

This research focuses on a three-part study to assess water quality in a coastal system and evaluate the absorption capacity of modified biochar and algae to remediate cadmium (Cd). The first chapter introduces the hypothesis and objectives, and the second chapter provides a detailed literature review. The third chapter focuses on the first study, where surface water samples and water quality data collected from a manned boat and a novel autonomous surface vessel (ASV) in the Western Mississippi Sound (WMS) in the summer of 2021 and 2022 were analyzed and the interrelationship between the nutrient, trace metals, salinity, and chlorophyll-a …

Impact Of An Automated Brush System On Intensively Managed Lactating Dairy Cattle Behavior, Production, And Stress Physiology, Allison Lyn Griffin

Theses and Dissertations

The dairy industry has increasingly prioritized improving animal welfare for intensively housed cows. This study evaluated the effects of environmental enrichment (EE) using an automated brush system on stress physiology, behavior, and productivity of lactating dairy cows. Fifty-nine pregnant and lactating dairy cows were divided into two groups: CON (no brush) and TRT (automated brush system). Saliva samples were collected to measure cortisol concentrations, and behaviors were monitored in the morning (07:00 h - 11:00 h) and evening (19:00 h - 23:00 h) using high-resolution cameras. The results indicated that cows with brush access had lower cortisol concentrations, suggesting reduced …

The Effects Of Biological Products On Soybean In Mississippi, Tucker Alan Hilyer

Theses and Dissertations

Biological products are an option being marketed towards Mississippi soybean producers that have many purported effects. The objective of this study was to evaluate the effects of biological products across the predominant soybean growing regions of Mississippi. Products were evaluated at seven site-years in Mississippi during the 2023 and 2024 growing season against an untreated and treated control in a randomized complete block design. Products were evaluated for agronomic, morphological, and pathological effects. Very few effects from biological products were observed. With a lack of effects, adoption of these biologicals in Mississippi may be seldom.

Exploring Sexual Dimorphism In A Drosophila Melanogaster Model Of Spinocerebellar Ataxia Type 1, Madelyn Hunter

Theses and Dissertations

Neurodegenerative diseases affect over 36 million people and are characterized by loss of motor control, neuronal degradation, and behavioral changes. The most common of these diseases exhibit sexually dimorphic effects. In this study, Spinocerebellar ataxia type 1 (SCA1) was modeled in the Drosophila central nervous system using the yeast hybrid UAS/GAL4 system. Locomotor activity and clock gene expression was monitored for male and female SCA1 and control flies. Clock genes such as per, tim, Clk, and cyc were monitored over a 24-hour period using qRT-PCR, and distinct sexual dimorphism was detected in locomotor activity and in gene expression for SCA1 …

Research Advancement Of Guayule Resin As A Natural Wood Preservative, Abigael Nasimiyu Laisa

Theses and Dissertations

Increasing concerns about human health and the environment have led to raised demand for eco-friendly wood preservatives. Guayule resin, extracted from Parthenium argentatum plant contains insecticidal and antifungal compounds making it a promising natural wood preservative. This study evaluated suitable carrier system for guayule resin, as well as leaching rate and termite resistance of treated yellow poplar and southern pine specimens. Wood specimens were treated with different concentrations of guayule in acetone, toluene, and ethyl acetate using vacuum impregnation. The leaching behavior and termite resistance of the treated specimens were assessed according to the AWPA Standard E11-16 and AWPA Standard …

An In Depth Examination Of Educational, Family, Economic, And Personal Determinants On Academic Performance, Engagement, And Stress: A Comprehensive Study Among Engineering Students, Oumaima Larif

Theses and Dissertations

This study explores the effects of family, education, economic, and personal factors on students’ decisions to pursue engineering as a profession and their long-term impact on performance as engineering students. We adopted a mixed-method approach, collecting data through surveys administered to undergraduate and graduate engineering students at Mississippi State University. The study results revealed that family, education, economic, and personal factors profoundly influence students' decisions to study engineering. We found that parental expectations, background information, and socioeconomic status, in conjunction with cultural norms, values, gender expectations, and religious beliefs, affect students. Additionally, this study identified gaps in the existing literature …

Taking Flight: Utilizing Unmanned Aerial Systems To Sample Insects In Soybean, William "Covey" Lockhart

Theses and Dissertations

Insect scouting in soybean is a labor-intensive task but is needed throughout the season to minimize losses. When soybeans are tall, soils are wet, or soybeans are planted in narrow rows, walking through these fields can be difficult. To overcome these limitations of manual sampling, an unmanned aerial vehicle (UAV) sampling platform was developed that can collect insects in a sweep net attached to the bottom of a UAV. This system has been named the “Drone Insect Net Sampling System” (DINSS). Previous research with this system has shown positive correlations to traditional manual sampling methods. To improve this system, modifications …

From Tree Rings To Streamflow: Reconstructing The Hydroclimatic History Of The Mississippi River Basin Over The Past Millennia, Brandon Mcdaniel

Theses and Dissertations

The Mississippi River Basin (MRB), the largest watershed in the United States, plays a central role in shaping regional hydroclimate. This study reconstructs streamflow variability in the MRB from the year 1200 to 2005 by applying principal component regression to streamflow data from 51 gauges and the North American Drought Atlas (NADA), a tree-ring-based reconstruction of the summer self-calibrating Palmer Drought Severity Index. Verification statistics indicated strong predictive skill across the domain. These findings provide critical insight into long-term hydroclimatic variability in the MRB and underscore the value of paleoclimate records for improving water resource assessments.

Machine Learning Classification Of Drones, Birds, And Bird-Like Drones Using Radar Micro-Doppler, Camera Imagery, And Radar-Camera Fusion, Kester Magalong Nucum

Theses and Dissertations

Counter-drone systems employ sensors such as radars and cameras to detect, track, and identify drones. These systems can confuse birds with drones, and the advent of bird-like drones exacerbates this problem. This thesis explores radar micro-Doppler, camera imagery, and their fusion for drone and bird classification. First, micro-Doppler models of quadcopters, birds, and bird-like drones were developed to generate a dataset of synthetic spectrograms for training support vector machine, k-nearest neighbors, Naïve Bayes, and convolutional neural network (CNN) classifiers. Second, transfer learning was applied on YOLOv10, a recently developed You Only Look Once object detector model, to detect and classify …

Earth Analogue Analysis Of Volcanic/Tectonic Interactions With Applications To Venusian Stresses, Michael Ortigoza

Theses and Dissertations

Venus shares many geological similarities with Earth, yet its tectonic processes and magma injection mechanisms remain poorly understood. A key question in planetary geology is how effusive volcanism persists despite the intense horizontal compression terrestrial bodies experience over time. To explore these issues, we examine the Spanish Peaks dike swarm in Colorado which serves as an ideal site for investigating magma intrusion under compressive stress conditions. Through field mapping, orientation measurements, and structural analysis, we identify a strong relationship between pre-existing joints and dike orientations, suggesting that these fractures serve as critical magma pathways in compressive regimes. Additionally, evidence of …

Utilizing Novel Application Methods To Mitigate Antagonism With Combinations Of Auxin And Grass Control Herbicides, Jake Patterson

Theses and Dissertations

Auxin and grass control herbicides are often applied in tank mixtures to provide multiple modes of action and to achieve broad-spectrum weed control. Literature indicates that auxin herbicides, when mixed in solution, may antagonize grass control herbicides, resulting in decreased grass weed control compared to the grass herbicide applied alone. Field and laboratory experiments were conducted in 2022, 2023, and 2024 at multiple locations in Mississippi. These experiments had three objectives: 1) evaluate grass weed control with glyphosate and clethodim in response to the simultaneous application with either dicamba or 2,4-D, using a commercially available direct-injection system compared to tank-mix …

Enhancing Chemical Synthesis For Sustainability And Process Monitoring Utilizing Group Ten Metal Catalysis, Amanda M. Perkins

Theses and Dissertations

This thesis explores two sustainable methodologies by modifying established catalytic processes using group ten metal complexes from nickel and palladium. Efforts were made to provide alternatives for processes that often do not follow the principles of green chemistry. In the first project, a nickel(II) N-heterocyclic carbene complex was used to perform catalytic hydrogenation of 2-acetylpyridine under mild conditions. The complex was synthesized and characterized with techniques including mass spectrometry and 1H-NMR. Following this, the reactions were carried out to optimize conditions and yield moderate conversions. For the second project, the Suzuki-Miyaura cross coupling of 7-chlorotryptophan occurred utilizing a palladium complex …

Faculty Perceptions And Use Of Open Educational Resources In Postsecondary Stem Classrooms, Gabriel Posadas

Theses and Dissertations

This study examined how faculty in Science, Technology, Engineering, and Mathematics (STEM) or STEM-related fields perceive and utilize open educational resources (OER) in their classrooms and how faculty characteristics (e.g., age, teaching experience, OER experience) influence their adoption. A quantitative survey was administered to 48 STEM faculty across 8 colleges at a large, southeastern university. Findings revealed that faculty generally acknowledged OER’s benefits, particularly its cost-saving potential, and all faculty without prior OER experience and 86.5% of faculty with OER experience expressed neutral to positive perceptions regarding OER’s ability to reduce financial burdens. Faculty with OER experience also recognized its …

Removal Of Harmful Algal Bloom Toxin, Microcystin-Lr Via Graphene Coated Polymers, Justin Douglas Puhnaty

Theses and Dissertations

This study investigates a novel 3D-printed graphene-coated polymer (GCP) for the removal of Microcystin-LR (MC-LR), a harmful cyanotoxin produced during harmful algal blooms (HABs). While graphene nanoplatelets (GnPs) exhibit high adsorption capacity, their powdered form limits practical application. To address this, GnPs were coated onto 3D-printed poly(lactic acid) (PLA) substrates, enabling enhanced handling for field deployment. Surface characterization using laser confocal microscopy, Raman spectroscopy, and thermogravimetric analysis confirmed GnP distribution and coating uniformity. Batch adsorption experiments revealed pseudo-second-order kinetics, a maximum adsorption capacity (qmax) of 596 μg/g, and adsorption behavior best described by the Langmuir isotherm. Statistical analysis and comparison …

“Sometimes The World Don’T Give You What You Need”: Black Motherhood And Kinship As Resistance To Necropolitics In Jesmyn Ward’S Bois Sauvage, Hailey N. Reeder

Theses and Dissertations

This thesis explores how Black motherhood and kinship serve as subversive forces within necropolitical landscapes in Jesmyn Ward’s Where the Line Bleeds, Salvage the Bones, and Sing, Unburied, Sing. Drawing on Achille Mbembe’s theory of necropolitics, this study examines how the economic and social constraints of these environments disrupt Black family structures, emphasizing the necessity of kinship for survival. In Where the Line Bleeds, Cille’s absence disrupts traditional family roles, yet kinship networks allow the family to endure. In Salvage the Bones, Esch’s journey redefines the “bad” Black teen mother stereotype, highlighting how kinship offers support amidst stigma. In Sing, …

Movement, Microhabitat, And Metapopulations: Improving Our Understanding Of Gopher Frog (Rana [Lithobates] Capito) Ecology In Alabama, Krista Michelle Ruppert

Theses and Dissertations

Gopher frogs (Rana [Lithobates] capito) are a species in decline in the southeastern United States. In Alabama, gopher frogs are a species of greatest conservation need, only known to consistently breed in two ponds in the south of the state; however, efforts to restore breeding ponds and to reintroduce metamorphs throughout their historic range are ongoing. The objectives of this dissertation were to assess trends in gopher frog ecology in Alabama to inform conservation plans. In chapter 2, I used radiotelemetry to assess the post-breeding movements of gopher frogs in 2021 and 2022. I found that frogs in Alabama moved …

Ecology And Management Of Alligatorweed (Alternanthera Philoxeroides) And An Associated Thrips Biological Control Agent (Amynothrips Andersoni), Samuel Alec Schmid

Theses and Dissertations

Alligatorweed (Alternanthera philoxeroides), native to South America, is a highly invasive aquatic macrophyte that is globally distributed and particularly problematic in the southeastern United States. In the United States, alligatorweed management has a long history, particularly of chemical and biological control. Alligatorweed management saw early success with a South American flea beetle (Agasicles hygrophila), but this agent’s utility has waned. Despite the long history of alligatorweed invasion, several important research questions remain, and the research in this dissertation seeks to answer some of these questions. This research focuses on multiple and diverse aspects of alligatorweed biology, ecology, and management: (1) …

Assessing The Kinematics And Kinetics About The Knee With An Isokinetic Dynamometer And Force Plates During Field-Based And Lab-Based Trials., Samantha Ann Searles

Theses and Dissertations

The incidence rate in knee injuries has increased over the last 20 years, with women at a 2-8 times higher incidence rate compared to men. This is likely a result of lower neuromuscular control of the trunk, generating less hip muscle activation, and more reliance on the quadriceps, alongside reduced hip, knee, and dorsiflexion angles, paired with increased knee valgus angles, ground reaction forces (GRF), hip adduction, and knee rotation upon landing from jumps. The focus of this study is to determine if knee kinetics and kinematics during field- and lab-based trials are associated with knee injury predictors. Theoretically, if …

Projected Future Reservoir Impairment In The Conterminous United States Following Three Climate Change Scenarios, Darren James Shoemaker

Theses and Dissertations

Anthropogenic climate change has been associated with reservoir aging and reduced ecosystem function. Communities throughout the world depend on reservoirs for services such as hydropower, drinking water, flood mitigation, and recreational opportunities. Though reservoirs were typically constructed to meet human needs, they are now also acknowledged as supporting biodiverse aquatic communities. Reservoir managers are expected to maintain services and biodiversity demanded by diverse users despite high uncertainty surrounding how climate will influence reservoirs through time. Additionally, data describing reservoir function at broad spatial extents are often either unavailable, incompatible between agencies, or prohibitively resource-intensive to obtain. Expert opinion surveys are …

Does An Adapted Swimming Program Improve Self-Efficacy In Individuals With Intellectual Disability?, Georgia Grace Starr

Theses and Dissertations

BACKGROUND: Short-term adapted swimming programs may improve self-efficacy in individuals with intellectual disability (ID). PURPOSE: We investigated if self-efficacy was improved from the perspectives of swimmers, their parents, and volunteering staff. METHODS: A 5-day program (60 min∙day-1) focused on swim skill development and independence, with each participant supported by a volunteer without disability. Semi-structured interviews were conducted with 5 swimmers (14–35 years, 4 females), 5 parents (40–70 years, all mothers), and 5 volunteers (17–64 years, 4 females). Analysis, using open, structured, and focused coding, highlighted themes aligning with Bandura’s Self-Efficacy Theory (SET)—previous experience, vicarious experience, social persuasion, and feedback—and Self-determination …

An Exploratory Mixed-Methods Investigation Of Previous Sexual Health Communication Between Lesbian, Gay, Bisexual, Or Queer Young Adults And Their Parents, Haley Elizabeth Solace

Theses and Dissertations

Research suggests parent-child communication about sexual health can promote positive sexual health outcomes (e.g., Estrada-Martinez et al., 2020; Jayne et al., 2021); however, parent-child sexual health conversations are often infrequent and heteronormative (Estes, 2017). Few studies explore sexual health communication between LGBQ youth and their parents. This study explores previous experiences with parent-child sexual health communication between seven LGBQ young adults, aged 18 to 26, and four of their heterosexual mothers, to better understand parent-child sexual health communication and differences between parental-child reflections. Findings suggest LGBQ young adults and parents recall similar experiences, however, perceived discomfort and parental competency differently. …

Effects Of Environmental Stress And Antimicrobials On The Health, Microbiome, And Product Shelf-Life Of Channel And Hybrid Catfish, Guyue Tang

Theses and Dissertations

Two studies investigated various aspects of channel and hybrid catfish production and processing. The first study examined the effects of ammonia stress (15 mg/L vs. 1 mg/L control) on growth performance and fillet quality. While channel catfish demonstrated superior growth, ammonia stress minimally impacted the sensory profiles of both species. Gut microbiota analysis revealed species-specific differences, with Lactococcus lactis dominating hybrid catfish communities. The second study evaluated buffered vinegar treatment (1.5%) on fillet shelf life during refrigerated storage. Vinegar-treated fillets maintained better microbiological quality, with aerobic plate counts remaining below 7 log cfu/g through day 6, while untreated fillets exceeded …

Synthetic Data Augmentation For Retinoblastoma Using Diffusion, Andrew Thompson

Theses and Dissertations

Many AI models rely on large and high quality datasets for optimal training. In certain cases, data can be difficult or expensive to obtain, making training difficult. Rare medical conditions are one of these cases. Datasets for retinoblastoma are severely lacking in quantity. Diffusion has been used to create synthetic data in the industrial, medical, and financial domains. By applying the latest Diffusion methods to retinoblastoma, this work seeks to improve predictive model performance on identifying retinoblastoma.

Estimation Of Soybean Root Traits Using Computer Vision And Deep Learning, Muhammad Usman

Theses and Dissertations

Root phenotyping provides insights into root structure, function, and response to environmental stimuli, aiding researchers in improving crop yields, developing new plant varieties, and enhancing plant health. Traditionally, measuring root traits, such as length and area, is manual, time-consuming, and resource intensive. This study introduces a deep learning-based computer vision method for soybean root segmentation and traits estimation using RGB (red, green, blue) images captured under controlled illumination. A separate web-based application was also developed that can extract the root length and area using RGB images. A diverse set of 3,363 soybean root images was collected using an in-house root …

Myxozoan Diversity And Life Cycles In Catfish Production Ponds In Mississippi, Usa, Ethan Woodyard

Theses and Dissertations

Catfish aquaculture is a critical industry in the United States and Mississippi in particular. The industry is beset by depredation, rising feed costs, competition with imports, and loss to disease. Chief among these is the myxozoan parasite and causative agent of proliferative gill disease, Henneguya ictaluri. In chapter 2, novel molecular markers for greater resolution in species identification of these parasites are provided, allowing more robust life cycle inference, species-level identifications, and inference of evolutionary relationships through molecular phylogenetic analyses. Chapters 3–5 apply the approaches developed in Chapter 2 to a broad array of taxa beyond catfish-infecting Henneguya spp. These …

Applications Of The Mathieu Groups And Information Theory In Dna Encoding Functions, Juan C. Nava Jr

Theses and Dissertations

A foundational idea in mathematics lies in breaking down existing components into their bare fundamentals. As evidenced by prime numbers and composites, we learn this idea at an early age. Categorizing these broken-down components into their simplest form allows mathematicians to construct proofs from emergent patterns. John Conway’s Atlas of Finite Groups in the 1990s was particularly concerned with the categorization of structures known as groups. There are certain axioms a group must adhere to, which amount to the retention of symmetry; ultimately a group helps us to better understand symmetric actions performed on a set with a binary operation. …

Method Development For The Analysis Of Drugs Of Abuse Using Solid Phase Extraction And High Pressure Liquid Chromatography, Sangeeta Kurre

Theses and Dissertations

The accurate detection and quantification of drugs of abuse and their metabolites for HPLC analysis is key in the medical, forensic, and environmental sectors. Additionally, the detection of compounds related to substance use disorders in clinical settings can play a crucial role in effective treatment decisions by healthcare practitioners. The ability to detect these compounds at trace levels in any given sample matrix is a known challenge. Coupling a reliable sample preparation method to HPLC analysis for matrix interference reduction and the preconcentration of species for enhanced detection limits may provide a preferred solution to the analysis of drugs of …

Voices In The Borderlands: Reimagining Identity, Cultural Belonging, And Dystopian Spaces In Anzaldúa’S Borderlands And Viramontes’S “The Cariboo Café”, Oralia G. Ramos

Theses and Dissertations

This thesis explores how Gloria Anzaldúa’s Borderlands/La Frontera (1987) and Helena María Viramontes’ short story “The Cariboo Café” (1985) portray marginalized individuals navigating liminal spaces of identity, oppression, and survival. Borderlands/La Frontera and “The Cariboo Café” show how systematic violence and displacement shatter the self, pushing characters to navigate trauma in a dystopian space. Sonya, Macky, the café owner, and the grieving mother represent Anzaldúa’s concepts of borderland subjectivity, betrayal, and spectral haunting.

Sonya and Macky, two undocumented children, represent Anzaldúa’s borderlands subjects and reside in a state of nepantla, an in-between space of cultural dislocation. The café owner …

Sustainable Process Valorization For Bioactives From Invasive Plants Environmental Burden And Their Efficacy As Antimicrobial Agents, Shamprasad Br

Theses and Dissertations

Agri-food industries produce large quantities of fruit waste which are usually discarded and one such major beverage juice waste is Citrus waste. Likewise, invasive plants like Prosopis juliflora, which is richly distributed across Tamil Nadu, are underutilized for secondary metabolites/bioactives isolation. Halophytes are another rich source of bioactives present around mangrove forests and distributed in the salt rich marshy land.

1. Separation of phenylpropanoids from the Citrus waste through solvent extraction and pH-assisted precipitation was developed. The PPCM precipitated (phenylpropanoids form Citrus medica) were analysed by HPTLC and were found to contain Rutin, Naringin, Quercetin-3-beta-glycoside, Chlorogenic acid, Ferulic acid and optimization …

Existence Of Traveling Waves In A Predator-Prey Invasion Model With Nonlocal Dispersal And Delayed Effects In Dispersal, Austin Simms

Theses and Dissertations

We investigate the existence and stability of traveling wave solutions in a predator--prey population model that incorporates both nonlocal dispersal and time-delayed interactions. The problem arises when species distributions and feeding or reproduction processes do not respond instantaneously, but rather exhibit lags in space and time. Our aim is to understand how these delays and nonlocal effects impact the wavefront speed and the eventual establishment of a predator population in previously prey-dominated regions. To accomplish this, we derive a PDE--integro--delay system from ecological considerations of prey self-regulation, predator ratio dependence, and jump-type dispersal kernels. We then employ a traveling wave …