Digital Commons Network^™

Evaluation Of Fluridone In Rice, Maria Carolina De Carvalho Rocha Souza

Graduate Theses and Dissertations

The increasing pressure of Palmer amaranth [Amaranthus palmeri (S.) Watson] in rice (Oryza sativa L.) fields demands new chemical control options to manage this weed. The recent labeling of fluridone on this crop from the three-leaf rice stage offers an additional residual herbicide for battling Palmer amaranth; however, research is needed to evaluate its effectiveness and rice tolerance. Field experiments were conducted to evaluate Palmer amaranth control and rice tolerance to fluridone across different locations in Arkansas in 2022, 2023, and 2024. Preemergence (PRE) applications of fluridone at 168 g ai ha^⁻1; (1× label rate) and 336 …

Space And Subjectivity In The Emerging American West, Scott Hendry

Graduate Theses and Dissertations

The American West resists theoretical definition. As myth, ideal, region, contact zone, place, space, symbol, territory, home, assemblage, dream, and home, the West is continually changing. As a region, the West is not a closed space; it is an open, ongoing constellation of processes, an unfolding simultaneity of storied events or happenings. This dissertation, “Space and Subjectivity in the Emerging American West,” explores literature and cinema of the modern West. My project seeks to answer the question “What is the American West?” by examining the work of novelists, poets, filmmakers, cultural geographers, philosophers, and photographers who reimagine identity, locality, and …

Crispr-Cas9 Integration Of Salmon Elovl2 In Zebrafish Enhances Lc-Pufa Biosynthesis And Growth Across Diets, Waleed Sami J. Al-Bachry

Graduate Theses and Dissertations

Fish are a rich source of EPA and DHA, which are well-known long-chain polyunsaturated fatty acids (LC-PUFAs). The sustainable production of these essential fatty acids poses significant challenges, mainly due to our dependence on marine fish and certain nuts. CRISPR-Cas system was utilized to insert the elongation of long-chain fatty acids-like2 (Elovl2) gene from Salmo salar into Danio rerio. Elovl2 was introduced at 10-15-minute post-fertilization, and successful integration confirmed by PCR genotyping, sequencing and expression of EGFP. Approximately 67% of injected embryos successfully exhibited EGFP and sequence results verified the gene integration of Salmo salar Elovl2 at the first start …

Variation In Stress Response Regulation Across Natural Isolates Of Saccharomyces Cerevisiae, Crystal Christine Crook

Graduate Theses and Dissertations

The stress response of Saccharomyces cerevisiae is a valuable area of study for understanding cellular adaptation mechanisms that govern survival in fluctuating environments. This dissertation investigates stress response regulation in yeast through the roles of Hog1 mitogen-activated protein kinase (MAPK) and the post-transcriptional regulator Mkt1, a key post-transcriptional regulator, in diverse wild yeast isolates. Hog1 is traditionally known for its central role in osmotic stress regulation in the high-osmolarity glycerol (HOG) pathway. This study expands the functional scope of Hog1 to include oxidative and ethanol-induced stress responses.

In parallel, we investigate post-transcriptional regulation of stress responses by the Mkt1 interactome, …

Fixed-Time Artificial Insemination Protocols Using Pre-Synchronization In Suckled Beef Cows, Wyatt Eugene Weber

Graduate Theses and Dissertations

Adoption of artificial insemination by beef producers has been limited within the United States. Estrous synchronization (ES) for fixed-time artificial insemination (FTAI) has been one of the most effective ways to implement artificial insemination into beef production systems, but its efficiency has primarily been restrained by the dependency on the effectiveness of the initial gonadotropin releasing hormone (GnRH) injection in many FTAI protocols. The hypotheses of these studies were to determine practical methods of pre-synchronization to improve current FTAI protocols, ultimately increasing beef herd reproductive performance. The objective was to evaluate the use of prostaglandin F2α (PGF) and progesterone (P4) …

Real Time Adaptive Control Of A Pid Via Genetic Algorithm Machine Learning Systems, Cemre Tas

Graduate Theses and Dissertations

The most common control method that is utilized by all industries across the world is the proportional-integrative-derivative controller (PID) due the relatively low cost and complexity of the system. However, there are draw-backs with PIDs, it is not adaptative to a changing system, so it works on nominal systems, and it starts breaking down when a system begins to have a non-linear response. The method chosen to overcome both is the utilization of machine learning with the use of genetic algorithms.

This method allows any PID system to be capable of adapting in real-time, while not adding significant additional cost …

Evolutionarily Conserved Functions Of The Gene Frazzled In Midline Axon Guidance In Drosophila Melanogaster And Tribolium Castaneum., Piyasi Ghosh

Graduate Theses and Dissertations

Axon guidance in bilaterians is often controlled by various signaling pathways in the nervous system, which determine the fate of the axons if they cross the midline or not. One such pathway involved is the ligand-receptor pair Netrin (Net) and Frazzled (Fra), which is also known as the attractive pathway that promotes midline crossing axons in insects and other bilaterians. Orthologs of the pathway ligand Netrins and their receptors Frazzled [Fra] in insects and Deleted in Colorectal cancer [DCC] in vertebrates are widely conserved in bilaterians. How well these regulatory roles of the protein are conserved is poorly understood. In …

The Efficacy Of Foam-Based Hand Sanitizers For The Control Of Enveloped And Non-Enveloped Virus Transmission, Francis Torko

Graduate Theses and Dissertations

Infectious disease transmission due to viruses such as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), influenza virus, human noroviruses (HuNoV), and hepatitis A, can occur via person-to-person contact or contaminated surfaces. Effective hand hygiene, including hand washing and use of hand sanitizers, is considered a critical tool for the control of infectious disease transmission, as recommended by the United States Centers for Disease Control and Prevention and the World Health Organization. However, while research on hand washing efficacy is well-documented, research on hand sanitizer efficacy, particularly for foam-based products, remains limited. This research addressed critical gaps in the area of …

Bacterial Chondronecrosis With Osteomyelitis In Broiler Chickens: Experimental Lameness And Additive Probiotic Treatments, Amanda Anthney

Graduate Theses and Dissertations

With the global population already surpassing 8.2 billion and expected to reach 9.7 billion by 2050, the poultry industry has seen a surge in demand due to its unmatched efficiency and affordability for consumers across the globe. Selective breeding and quality nutrition developments since the industry's commercialization have allowed producers to grow broilers up to 7 pounds by market age. While this extraordinarily efficient process has allowed quality poultry products to be available worldwide, the modern-day broiler has developed a multitude of musculoskeletal issues. Due to the lack of integral skeletal development to match the rapid production of muscle tissue, …

Characterization Of Streptococcus Gallolyticus: An Emerging Pathogen Causing Turkey Streptococcosis, Latasha S. Gray

Graduate Theses and Dissertations

During the past five years, there has been an increased occurrence of Streptococcus gallolyticus in young turkey poults. This emerging pathogen previously affected turkey flocks without any indication of disease prior to acute mortality. However, recently there has been two cases of neurological presentation associated with S. gallolyticus subsp. pasteurianus that are unique to traditional disease presentation in turkey poults. The objectives of the present dissertation were to compile data associated with the two neurological cases and compare different S. gallolyticus strains as well as pathogenic Enterococcus cecorum to the neurological strains. The two neurological cases occurred between July and …

Fish Cultivation In Fallow Season Rice Fields: Effects On Landscape Methane Emissions, Samuel Carroll

Graduate Theses and Dissertations

Co-cultivation of aquatic animals and rice in the same field is a fairly common practice in various parts of the world, with a number of well-established agro-ecological benefits, such as decreasing the need for chemical pesticides and fertilizers, increasing soil organic matter, and reducing the land area needed for agricultural production. One area of environmental concern in rice production is greenhouse gas emissions. Rice production contributes about 10% of global anthropogenic methane (CH₄) emissions. Currently around 27.5% of Arkansas rice fields are flooded in the winter, which can increase CH₄ emissions in the fallow season by 45% …

Wb5, A Novel Biomarker For Monitoring Efficacy And Success Of Mass Drug Administration Programs For Wuchereria Bancrofti Elimination, Rachel E. Pietrow, Catherine Bjerum, Benjamin G. Koudou, Taniawati Supali, Philip J Budge, Peter U. Fischer, Thomas B. Nutman, Sasisekhar Bennuru

2020-Current year OA Pubs

The success of mass drug administration at reducing the prevalence of lymphatic filariasis in endemic areas has led to an increased need for highly sensitive and specific diagnostic assays. To be useful in post-elimination surveillance in areas with low to zero prevalence, high test performance characteristics are required to enable the early detection of infection recrudescence. As current testing suffers from either sensitivity or specificity levels that fail to meet adopted target product profiles, additional targets that could be used as confirmatory tests or in multiplexed assays could overcome these issues. To this end, bioinformatic analyses coupled with stage-specific expression …

Gdf15 Links Adipose Tissue Lipolysis With Anxiety, Logan K Townsend, Léa J Becker, Jordan G Mccall, Et Al.

2020-Current year OA Pubs

Psychological stress changes both behaviour and metabolism to protect organisms. Adrenaline is an important driver of this response. Anxiety correlates with circulating free fatty acid levels and can be alleviated by a peripherally restricted β-blocker, suggesting a peripheral signal linking metabolism with behaviour. Here we show that adrenaline, the β3 agonist CL316,243 and acute restraint stress induce growth differentiation factor 15 (GDF15) secretion in white adipose tissue of mice. Genetic inhibition of adipose triglyceride lipase or genetic deletion of β-adrenergic receptors blocks β-adrenergic-induced increases in GDF15. Increases in circulating GDF15 require lipolysis-induced free fatty acid stimulation of M2-like macrophages within …

Crises In Australian Education, The Push For Educational Technology And The Medium-Oriented Perspective Of Neil Postman, Andrew Hutcheon

Research outputs 2022 to 2026

From teacher shortages to declining literacy, the Australian education system faces multiple crises. This paper turns to the work of Neil Postman, who started as a high school teacher but later turned towards communication and media studies, to provide an alternative account of parts of this crisis, especially those around the role of technology in education. In his early works, his concern is attached to the concept of education as a ‘subversive concept’ and then a ‘conserving concept’ – first aiming to create young people engaged in civic society, then aiming to preserve written culture against television. After a middle …

The Contribution Of De Novo Coding Mutations To Meningomyelocele, Yoo-Jin Jiny Ha, Ashna Nisal, Isaac Tang, Chanjae Lee, Ishani Jhamb, Cassidy Wallace, Robyn Howarth, Sarah Schroeder, Keng Ioi Vong, Naomi Meave, Fiza Jiwani, Chelsea Barrows, Sangmoon Lee, Nan Jiang, Arzoo Patel, Krisha Bagga, Niyati Banka, Liana Friedman, Francisco A Blanco, Seyoung Yu, Soeun Rhee, Hui Su Jeong, Isaac Plutzer, Michael B Major, Béatrice Benoit, Christian Poüs, Caleb Heffner, Zoha Kibar, Gyang Markus Bot, Hope Northrup, Kit Sing Au, Madison Strain, Allison E Ashley-Koch, Richard H Finnell, Joan T Le, Hal S Meltzer, Camila Araujo, Helio R Machado, Roger E Stevenson, Anna Yurrita, Sara Mumtaz, Awais Ahmed, Mulazim Hussain Khara, Osvaldo M Mutchinick, José Ramón Medina-Bereciartu, Friedhelm Hildebrandt, Gia Melikishvili, Ahmed I Marwan, Valeria Capra, Mahmoud M Noureldeen, Aida M S Salem, Mahmoud Y Issa, Maha S Zaki, Libin Xu, Ji Eun Lee, Donghyuk Shin, Anna Alkelai, Alan R Shuldiner, Stephen F Kingsmore, Stephen A Murray, Heon Yung Gee, W Todd Miller, Kimberley F Tolias, John B Wallingford, Spina Bifida Sequencing Consortium, Sangwoo Kim, Joseph G Gleeson

Faculty, Staff and Students Publications

Meningomyelocele (also known as spina bifida) is considered to be a genetically complex disease resulting from a failure of the neural tube to close. Individuals with meningomyelocele display neuromotor disability and frequent hydrocephalus, requiring ventricular shunting. A few genes have been proposed to contribute to disease susceptibility, but beyond that it remains unexplained1. We postulated that de novo mutations under purifying selection contribute to the risk of developing meningomyelocele2. Here we recruited a cohort of 851 meningomyelocele trios who required shunting at birth and 732 control trios, and found that de novo likely gene disruption or …

A Herpetofaunal Inventory Study Of Two National Wildlife Refuges In The Mississippi Delta And Associated Evaluation Of Trapping Efficacy, Andrew Holzinger

Master's Theses

The objectives of this project were to record the diversity and distribution of amphibian and reptile species present at Panther Swamp and Hillside National Wildlife Refuges (NWR) and to quantify trapping efficacy as a result of various methodologies under different habitat variables. The primary methods employed were two varieties of drift fence trap arrays consisting of 100-foot sections of silt fencing with buried 2.5-gallon buckets as pitfall traps and box traps placed at the end of each fence to capture larger organisms. When conditions permitted, aquatic trapping was also employed across the Refuges. A total of 55 species were documented, …

Those Magnificent Men In Their Fighting Machines: An Investigation Into The Lives Of Wwi Tankmen, Lucas C. Campbell

Master's Theses

This thesis will look at the immense backlog of war diaries, journals, personal letters, government documentation, and oral histories left behind by British tank crewmen of the First World War. The purpose of this investigation is mainly to uncover the reasons that individuals were chosen for transferal into the Royal Tank Regiment, where they were transferred from, what their training consisted of before their deployment, and their combat history once they were sent into the battlefields on the Western Front. The goal of this project is to gauge the reaction to the emergence of this crucially important technology on a …

Encapsulation Of Lactobacillus Reuteri Dsm 17938 In W/O/W Emulsion: Influence Of Oil Type On Viability And Oxidative Stability, Nora Mohamed Alantali

Theses

Probiotics, known for their wide range of health benefits, have been gaining recognition on their effects on the gut-brain axis. This axis, operated via various pathways, can be modulated by the type and functions of probiotics found in the gut microflora. However, probiotics face several stress factors before reaching the gut which hinders them from being functional. The main objective of this thesis was to construct a stable double-emulsion-based delivery system for probiotics, which can act as a barrier against the harsh conditions of the digestive system. Lactobacillus reuteri DSM 17938 was loaded in a water-in-oil-in-water Pickering double emulsion system, …

Nitrate And Nitrite Food Composition Database: An Update And Extensive Deep Dive, Liezhou Zhong, Jonathan M. Hodgson, Joshua R. Lewis, Lauren C. Blekkenhorst, Nicola P. Bondonno, Marc Sim, Richard J. Woodman, Catherine P. Bondonno

Research outputs 2022 to 2026

Background: Growing evidence suggests that health outcomes of dietary nitrate and nitrite intake are food source dependent. Robust evaluations in dietary studies necessitate a comprehensive and current food composition database of nitrate/nitrite content, along with variation based on country or region of origin, calendar year, growing season, and cooking method. Objectives: The objectives of this study were to update the previous animal- and plant-based food nitrate/nitrite databases and investigate effects of cooking methods, seasonal and geographic variations, and longitudinal changes on nitrate and nitrite content to guide application of the database in observational and clinical studies. Methods: Food nitrate/nitrite composition …

Origins: Nutritional Profile Of Children Aged One Year In A Longitudinal Birth Cohort, Sarah Whalan, Poonam K. Pannu, Rachelle A. Pretorius, Alexander J.J. Scherini, Sonia Gregory, Susan L. Prescott, Desiree Silva

Research outputs 2022 to 2026

Background: Dietary intake during the first year of life is a key determinant of a child’s growth and development. ORIGINS is a longitudinal birth cohort study investigating factors that contribute to a ‘healthy start to life’ and the prevention of non-communicable diseases. Methods: This descriptive cross-sectional study aims to describe the dietary intakes of one-year-old children participating in ORIGINS and compare these to the Australian Dietary Guidelines and Nutrient Reference Values (NRVs). Between 2020 and 2023, dietary intake data were collected on 779 one-year-old children using a Food Frequency Questionnaire (FFQ). The analysis explored milk intake (breastmilk, infant formula, and …

Revised Phylogeography Of The Common Brushtail Possum (Trichosurus Vulpecula) Reveals New Insights Into Genetic Structure Across Australia, Shelby C. Middleton, Robert A. Davis, Kenny J. Travouillon, Anna J.M. Hopkins, Harriet R. Mills, Linette S. Umbrello

Research outputs 2022 to 2026

Understanding genetic relationships within species is essential for identifying distinct genetic lineages and informing conservation strategies, particularly for species with fragmented or widespread geographic distributions. One such widespread species that has suffered declines across Australia, despite remaining common in some areas, is the common brushtail possum (Trichosurus vulpecula), a nocturnal and arboreal marsupial. Previous genetic studies on brushtail possums had limited sampling, which has precluded a comprehensive assessment of the relationships within the species and genus. Using both single nucleotide polymorphism markers and the mitochondrial cytochrome b gene, this study employed phylogenetics, ancestry coefficients, and tested genetic differentiation, to examine …

Ecological Specialisation Of Reef Fishes Peaks In Global Biodiversity Hotspots, Zoé Delecambre, Renato A. Morais, Alexandre C. Siqueira, Emma Paul Costesec, Caroline E. Dubé, Sergio R. Floeter, Alan M. Friedlander, Fabien Leprieur, Yves Letourneur, Lucas T. Nunes, Jordan M. Casey, Valeriano Parravicini

Research outputs 2022 to 2026

Aim: The role of ecological specialisation in shaping biogeographic and evolutionary patterns remains unresolved. To date, few studies have quantitatively examined consumer niche breadth at a global scale. We describe global biogeographic and diversification patterns of specialisation, measured using trophic and thermal niches, for a highly diverse assemblage of consumers: reef fishes. First, we investigated the confluence of specialisation with global biogeographic patterns in species richness and reef area. Then, we tested whether these patterns could be explained by differences in diversification rates and geographic ranges. Location: Tropical reefs across the globe. Time Period: Present. Major Taxa Studied: Reef fishes. …

Clostridioides Difficile In Feral Horse Populations In Australia, Natasza M.R. Hain-Saunders, Daniel R. Knight, Andrea Harvey, Mieghan Bruce, Brian A. Hampson, Thomas V. Riley

Research outputs 2022 to 2026

Clostridioides difficile is a known cause of diarrhea and colitis in human and non-human animals. While C. difficile is regularly isolated from domesticated horses, little is known about its prevalence in wild or feral populations. In Australia, the horse population encompasses a mix of both domesticated and feral animals, with the feral population of 400,000 estimated to be the largest in the world. This study investigated the presence and characteristics of C. difficile in Australian feral horses and evaluated their potential as a source or reservoir of C. difficile in the wider community. Fecal samples (n = 380) were collected …

Evaluating The Effects Of Co₂ And Uv-B On Sporobolus Virginicus (L.) Kunth Growth Under Open Top Chamber: A Comparison Of Silicon Nanoparticle-Treated And Untreated Plants, Suhaila Humaid Ablooshi

Theses

The study focused at how silicon nanoparticles (SiNPs; 50 mg/L) affected the growth, photosynthetic efficiency, and biochemical responses of the salt-tolerant halophyte Sporobolus virginicus in four different environments. They are control, high CO₂, UV-B radiation, and a mix of high CO₂ and UV-B. Plants that were treated with SiNPs showed big changes in their shape, such as more biomass, bigger leaf area, and better root systems in all conditions. The use of combined stress treatments caused a big increase in the levels of chlorophyll a, chlorophyll b, total chlorophyll, and carotenoids. As a result, that the plants were better at …

A Study Of The Impact Of Balancing, Geometric Transformation, Generative Networks, And Roi Techniques In Eye Diseases Classification, Sghaira Hareb Alnuaimi

Theses

Automatic detection of ocular diseases helps medical professionals efficiently identify eye disorders, reduce diagnostic errors, and accelerate diagnoses to prevent blindness. Deep learning has been successfully utilized in various fields, including medical image classification. However, in spite of these advancements, challenges remain in ocular disease classification.

The objective of this work is to address these challenges using data processing, data augmentation in combination with Region of Interest (ROI) techniques. Medical datasets often suffer from scarcity, imbalance, and low-quality images, leading to inaccurate classification. To mitigate these issues, we utilize the ODIR dataset, which contains 7,000 labelled training images for both …

Assembly And Annotation Of The Shortnose Gar Mitogenome, Benjamin Moginot

Undergraduate Research and Engagement Symposium

Environmental DNA (eDNA) is an emerging technique that ascertains species presence by collecting DNA that is shed by organisms and deposited in the environment. eDNA methods rely on the availability of genomes for target species, and the mitochondrial genome (mitogenome) is frequently used due to its abundance in the environment compared to nuclear DNA. One of the shortcomings of current eDNA work is the lack of mitogenomes against which to reference collected DNA samples. To help rectify this, I assembled and annotated the mitochondrial genome of the shortnose gar (Lepisosteus platostomus), a fish extant in the Mississippi River …

Völuspá: A New Translation With Commentary, Sophia Prock

Undergraduate Research and Engagement Symposium

This project attempts to translate the Völuspá – the poem of the Poetic Edda which narrates the beginnings and endings of the world in Norse religion – as primarily a religious text, and to provide commentary that elaborates Völuspá’s plot and major theological points in order to make it accessible for theological examination.

Communications, Computers And Networks, Gabriel Rodriguez, Soledad Robina

Communication Research Trends

There was a time when communication from computer to computer via satellite links. was the exclusive domain of the military, of highly specialized scientists, and of 'hackers'. That is no longer true. The serious scholar, even of the humanities, sometimes feels a bit 'out of it' when separated from his or her computer and modem.' Technical assistance is being provided to development workers in remote areas by means of relatively cheap ground stations and low-orbiting (non-geostationary) satellites. 'E-mail', using a bewildering array of special interest computer networks, generates whole new forms of society, united by electronics, rather than geography

Webmd: Diagnosing Ascot Hills Park’S Biodiversity Using Environmental Dna (Edna) From Spiderwebs, Sabriya Ann Seid

Undergraduate Library Research Awards

No abstract provided.

Antioxidant Effects Of Dimethyl Fumarate In Siv-Infected Rhesus Macaques May Indicate Its Use As A Neuroprotective Adjunct In Hiv Treatment, Adam K. Adelsberg, Yoelvis Garcia-Mesa, Halvor Juul, Dennis L. Kolson

Research Day

INTRODUCTION: Dimethyl fumarate (DMF) is an oral prodrug that is FDA approved for the treatment of multiple sclerosis. DMF is metabolized to monomethyl fumarate and able to cross the blood-brain barrier to illicit its central nervous system (CNS) affects. DMF is an antioxidant/anti-inflammatory that acts at the level of gene transcription through the Nuclear factor erythroid 2-related factor 2 (Nrf2) pathway. We assessed the potential neuroprotective effects of DMF in HIV infection by using the rhesus macaque simian immunodeficiency virus (SIV) infection model. We hypothesized that DMF would increase the expression of antioxidant enzymes and subsequently reduce central nervous system …