Digital Commons Network^™

Community Development Professionals’ Perceptions Of Agritourism In Mississippi, Emma Jane Berry

Theses and Dissertations

Agritourism has emerged as a strategy for supporting rural economies, strengthening community identity, and increasing agricultural literacy. Although prior research has examined agritourism operators and visitors, limited attention has been given to the perceptions of community development professionals who influence local planning and program support. The purpose of this qualitative exploratory study was to examine community development professionals’ perceptions of agritourism’s role in community development, economic growth, and agricultural literacy in Mississippi. Guided by Social Exchange Theory, data were collected through two semi-structured virtual focus groups with 12 professionals representing Extension, tourism, economic development, and Main Street organizations. Data were …

Evaluating The Spray Patterns Of Boomless Spray Nozzles At Increasing Application Speeds, Thomas Hayden Duncan

Theses and Dissertations

Boomless nozzles have been largely ignored in spray studies, resulting in limited understanding of their spray patterns and how they are affected by operating parameters. A study was conducted to evaluate the effect of application speed on the performance of four boomless nozzles. Dyed water was applied to Kromekote® paper to assess spray distribution based on coverage data at three speeds, and MSMA was applied to a mixed turf stand to evaluate the effect of speed on performance. Overlap simulations were done to evaluate how uniformity could be improved, and nozzle performance was compared to manufacturer claims. Spray patterns of …

Cortical Bone Density And Thickness Assessment Of Intraradicular Sites In Adolescent Patients Using Cbct Imaging, Sara Endo

UNLV Theses, Dissertations, Professional Papers, and Capstones

Background: The indications for the use of cone beam computed tomography (CBCT) in orthodontics has grown since it was first introduced and dentists are discovering new ways that 3D images enhance diagnosis and treatment planning. Evaluating bone quality and quantity can be measured as bone density and thickness in CBCT imaging and is helpful for temporary anchorage device (TAD) placement in orthodontic treatment. TADs rely on primary stability and are commonly used in orthodontic treatment to increase anchorage and expand the limit that nonsurgical orthodontics can provide.

Objectives: This study aims to assess the bone thickness and density at different …

Unknowing Sacrifices: Public Health And Radiation Illness In New Mexico And Nevada, 1940s-1960s, Beatriz Avila-Marquez

UNLV Theses, Dissertations, Professional Papers, and Capstones

The detonation of the first atomic bomb in the early morning of July 16, 1945, in New Mexico welcomed the atomic age that forever changed the world. After that day, thousands of lives were lost due to nuclear weapons, and hundreds of thousands more continued to suffer from the effects of atomic testing. The Atomic Energy Commission, fueled by the arms race of the Cold War, chose Nevada to continue the United States’ nuclear weapons testing. Knowledge of the dangers of radiation exposure, the effects of radiation, and techniques to prevent exposure are now available in part due to the …

First Recombinant Expression, Purification, And Film Formation Of A Single Solitary Bee Silk Protein From Osmia Lignaria, Oran Wasserman, Kristin K. Durrant, Jackson J. Morley, Paula E. Oliveira, Mallory R. Wootton, Brianne E. Bell, Ethon D. Van Noy, Randolph V. Lewis, Justin A. Jones

Biology Student Research

Solitary bees account for most described bee species worldwide, with many spinning silk fibers to form protective cocoons during development; however, solitary bee silk proteins remain largely unexplored in recombinant systems and biomaterial fabrication. Here, we report the first recombinant expression and biomaterial formation from a solitary bee silk protein. Osmia lignaria silk fibroin 2 (OligF2) was expressed in Escherichia coli BL21(DE3) using an expression and purification scheme adapted from a recombinant hagfish intermediate filament (rHIF) workflow, yielding 0.34 g/L at ~70% purity. The purified OligF2 protein was cast into films at 0.75% and 1% (w/v). …

Simulation Of Post-Tensioned Clt Rocking Wall And Platform Structure Response Under Earthquake Lateral Loads With Simplified Equivalent Model, Yunxiang Ma, Qingli Dai, Da Huang, Miaomiao Li, Xiang Zhao

Michigan Tech Publications

The post-tensioned cross-laminated timber (CLT) rocking wall is a recently developed resilient CLT lateral force-resisting system with a self-centering feature. The structural responses of the systems with different designs need to be determined and evaluated efficiently to promote the development and standardization of industrial applications. This study developed a computationally efficient, component-assembled numerical model for post-tensioned cross-laminated timber (PT CLT) rocking walls that captures decompression, post-tension self-centering, and energy dissipation within a framework. The single wall model was assembled using nonlinear zero-length springs for the compression at the CLT bottom, truss bar element for the PT tendon, and elastic shell …

Mathematical Modeling Of A Coral-Symbiont System To Assess Heat-Induced Bleaching, Anna Zittle, Angela Reynolds, Rebecca Segal, Liza Roger, Nastassja Lewinski

Biology and Medicine Through Mathematics Conference

No abstract provided.

Agentic Scientific Machine Learning For Autonomous Model Discovery In Systems Pharmacology, Nazanin Ahmadi, George Karniadakis

Biology and Medicine Through Mathematics Conference

No abstract provided.

Understanding Behavioral And Representational Divergences Of Humans And Machines, Thomas Lasman Botch

Dartmouth College Ph.D Dissertations

Human behavior and cognition are strikingly variable: people differ from one another in their preferences and abilities, and even from themselves across situations. Yet this diversity arises from common neural machinery shaped by the complex environments humans inhabit. A central objective of cognitive neuroscience is to understand how this varied experience emerges from interactions between brains, agents, and environments. In this dissertation, I argue that comparing behavior and neural computation across humans, artificial systems, and contexts is essential for understanding the flexibility of human cognition. Across three chapters, I use this comparative approach to examine how the rich, multimodal contexts …

In Vitro Modeling Of Macrophage And Cd8+ T Cell Activation: Evaluating Immortalized Cell Lines For Use In Undergraduate Immunology Laboratories, Lucy Groothuis

Masters Theses

The immune system is a complex, highly coordinated network of cells and signaling molecules that protects the body from infection and disease. Immunology is therefore a fundamental component of undergraduate education for students pursuing careers in medicine and biomedical research. Despite its importance, many undergraduate immunology courses lack a laboratory component. To address this gap, we developed an open-access immunology laboratory manual and evaluated its ability to generate meaningful data using primary murine cells and commercially available cell lines. Given the cost and logistical constraints of using mouse models in an undergraduate laboratory setting, we evaluated whether immortalized cell lines …

Improved Nutritional Value Of Spinach (Spinacia Oleracea L.) Through Moderate Salinity-Induced Regulation Of Vitamin C And Folate Pathways, Laleh Ahmadi, Hanieh Mohajjel Shoja, Elham Mohajel Kazemi, Maryam Kolahi

Turkish Journal of Botany

Soil salinity is a major abiotic stress affecting over 20% of cultivated and 33% of irrigated lands worldwide, significantly limiting crop productivity and nutrient biosynthesis. Vitamin C and folate are crucial antioxidants in plant stress tolerance and human nutrition; however, their regulation under salt stress remains unclear, particularly in leafy vegetables. This study evaluated the effects of different salinity levels (0, 50, 150, 250, and 350 mM NaCl) on physiological traits, antioxidant activity, vitamin C and folate accumulation, and the expression of related biosynthetic genes in spinach (Spinacia oleracea L.). High salinity (250–350 mM) reduced growth, leaf area, and pigment …

A Hedonic Analysis Of Farm Tractor Auction Prices, Madison Pearson, Chad Fiechter, Andy Campbell

Department of Agricultural Economics Faculty Publications

Used farm machinery values play a critical role in farm management and in assessing the financial health of the agricultural sector. However, the heterogeneity of machines, particularly regarding embedded technology and usage, complicates efforts to isolate the factors that influence prices. This study leverages a detailed dataset from Tractor Zoom to estimate the effects of machine characteristics and market conditions on auction prices of used 300 to 450 horsepower tractors. We find a nonlinear relationship between machine usage and price: tractors with fewer than 500 hours of use lose approximately 118⁢𝑝⁢𝑒⁢𝑟⁢𝑎⁢𝑑⁢𝑑⁢𝑖⁢𝑡⁢𝑖⁢𝑜⁢𝑛⁢𝑎⁢𝑙⁢ℎ⁡𝑜⁢𝑢⁢𝑟,𝑤⁢ℎ⁡𝑖⁢𝑙⁢𝑒⁢𝑡⁢𝑟⁢𝑎⁢𝑐⁢𝑡⁢𝑜⁢𝑟⁢𝑠⁢𝑤⁢𝑖⁢𝑡⁢ℎ⁡𝑚⁢𝑜⁢𝑟⁢𝑒⁢𝑡⁢ℎ⁡𝑎⁢𝑛⁢10,000⁢ℎ⁡𝑜⁢𝑢⁢𝑟⁢𝑠⁢𝑠⁢ℎ⁡𝑜⁢𝑤⁢𝑜⁢𝑛⁢𝑙⁢𝑦⁢𝑎⁢𝑤⁢𝑒⁢𝑎⁢𝑘⁢𝑙⁢𝑦⁢𝑠⁢𝑖⁢𝑔⁡𝑛⁢𝑖⁢𝑓⁡𝑖⁢𝑐⁢𝑎⁢𝑛⁢𝑡⁢𝑑⁢𝑒⁢𝑐⁢𝑙⁢𝑖⁢𝑛⁢𝑒⁢𝑜⁢𝑓⁡𝑎⁢𝑏⁢𝑜⁢𝑢⁢𝑡2 per hour. We also document pronounced seasonal patterns, with …

Virtualizing Practical Science Education: A Sociological Analysis Of Undergraduate Teaching And Learning, Sina J. Fakoyede, Femi E. Babalola, Oluwatoyin T. Obateru, Oluwayemisi D. Akomolafe, Deborah O. Alabi, Stella K. Ekundayo

Higher Learning Research Communications

Objectives: The study aims to investigate the perspectives of university teachers and students on integrating practical science teaching with virtual learning in a multicultural and diverse society, specifically within the context of southwestern Nigeria.

Methods: A mixed-methods approach was employed, involving data collection from 100 university lecturers and 400 undergraduate students across 10 universities. Qualitative data were gathered through semi-structured interviews with lecturers and focus group discussions with students. Quantitative data were obtained via structured questionnaires, allowing for triangulation and comprehensive analysis.

Results: Findings revealed that certain lecturers showed preferential support influenced by students’ cultural backgrounds or academic behavior during …

Accesstem: How Small Colleges Can Open Stem Pathways For Local High School Students, Dina D. Isakov

Program in Community Action (PICA)

This paper reflects my experience developing ACCESStem as part of the Program in Community Action (PICA) center at Connecticut College. ACCESStem is a community-engaged research project designed to create hands-on, lab-based STEM workshops for local high school students in New London. ACCESStem was built on the premise that even small liberal arts colleges can hold a meaningful impact on helping diversify the science workforce. Over the course of three years, this project took shape through my relationships with STEM faculty on campus and relationships with staff at the Holleran Center for Community Action. This paper works to begin contextualizing the …

Nanoparticle-Based Therapy For Peripheral Artery Disease: Evaluation Of Collagen Reduction And Fibrosis Mitigation In Ischemic Tissue, Tresha Nguyen

2026 Spring Honors Capstones Projects

Peripheral Artery Disease (PAD) is characterized by reduced blood flow, ischemic injury, and fibrosis, which collectively impair tissue function. Current treatment strategies are limited in their ability to target fibrotic tissue and restore normal function effectively. This study evaluates the therapeutic potential of drug-loaded nanoparticles to reduce fibrosis in ischemic tissue. Nanoparticles were synthesized and characterized for in vivo application. Tissue samples from experimental groups, including saline control, blank nanoparticles, free drug, and drug-loaded nanoparticles, were analyzed using Masson’s Trichrome staining to quantify collagen deposition. Histological images were processed using image analysis software to determine the percentage of collagen area. …

American Letters--Mary Hunter Austin: Excerpts From The Trail Book (1918)

The International Journal of Ecopsychology (IJE)

No abstract provided.

Distribution Of Mussels In Tributary Systems Of The Lower Ouachita River Watershed, Zach R. Crain

ATU Theses and Dissertations 2021 - Present

Freshwater mussel communities in small tributary streams are poorly documented in Arkansas, limiting the understanding of how diversity is structured across river networks. To address this data gap, we surveyed 147 sites across five previously unsurveyed watersheds in the South-Central Plains Ecoregion (SCPE). We sampled 5,473 individuals representing 17 species, including four Arkansas Species of Greatest Conservation Need (SGCN). We evaluated patterns in community variation utilizing β-diversity based on both presence-absence and abundance data. Overall turnover (βsor and Bray) was partitioned into replacement (βsim and BrayBal) and nestedness (βsne and BrayGra) components. Replacement and nestedness each drove turnover in two …

Determining Cave Presence And Diet Variation Of The Ozark Big-Eared Bat (Corynorhinus Townsendii Ingens) From Guano Dna, Lark E. Sybrant

ATU Theses and Dissertations 2021 - Present

The Ozark big-eared bat (Corynorhinus townsendii ingens; OBEB) is federally endangered in Arkansas, where it persists in a few small, geographically restricted populations within the Ozark National Forest. Although the region contains many caves that appear suitable for OBEB, expanded survey efforts are needed to locate additional roost sites for monitoring and protection. Effective conservation also requires a clear understanding of their distribution and diet. Traditional cave surveys can be disruptive and often miss cryptic species, and earlier diet studies based on manually sorting prey remains provided only coarse taxonomic resolution and overlooked soft‑bodied insects. To address these …

Distribution, Habitat, And Fish Assemblages Associated With The Rocky Shiner In Arkansas, Savannah L. Wise

ATU Theses and Dissertations 2021 - Present

The Rocky Shiner (Notropis suttkusi) is a minnow species endemic to the Red River and its tributaries in southern Arkansas and Oklahoma. This species is petitioned for listing under the Endangered Species Act and is a species of greatest conservation need (SGCN) in Arkansas. However, there is little information for the species’ distribution, habitat use, and ecological niche, especially within the Arkansas portion of its range. Because of this data gap, my study provides an updated description of its distribution and habitat associations using conditional occupancy modeling and explores patterns of species co-occurrence within the community. I sampled …

The Legacy Of Lead: Lead Exposure's Harmful Effects And Its Concentration In Poc Communities, Layla Sophronia Barber

Student Theses 2015-Present

This thesis examines the disproportionate burden of lead exposure carried by low income, POC communities. The systemic nature of this problem is a symptom of a longstanding legacy of environmental injustice in the United States. Decades of federal neglect are reflected in the higher statistics of lead exposure and poisoning in predominantly black communities. While it is understood that lead exposure poses a serious threat to physical health and early cognitive development, there is a discouraging lack of urgency to remove the toxin from non-wealthy communities. The material covered by this thesis aims to identify and correct the discriminatory social …

A Sturdy Future: Mangrove Restoration Against Climate Extremes, Gabriella Marie Siasoco

Student Theses 2015-Present

This paper addresses the impacts of climate change on natural disasters and examines how rehabilitation of mangrove forests in Mesoamerica and the Caribbean can mitigate those effects. Rising ocean and atmospheric temperatures contribute to higher sea levels and more severe hurricanes and tropical storms, characterized by increased frequency, duration, and intensity in peak winds, storm surges, and rainfall. Mangrove ecosystems act as vital buffers against coastal disturbances such as tsunamis and extreme storms, while contributing to climate change mitigation through carbon sequestration. Additionally, they improve water quality by filtering nutrients, preventing eutrophication. Despite their ecological and economic value, mangroves in …

Bio 340 Final Project: A Comparative Analysis Of German And French Energy Policy, Adam Garies

Biology Student Scholarship

Adam Garies - Environmental Biology ‘28

European energy systems have undergone rapid transformation over the past two decades, with countries adopting different strategies to reduce carbon emissions. This divergence is particularly evident between Germany and France. Following the Fukushima disaster in 2011, Germany accelerated its nuclear phase-out, while France has declared its commitment to nuclear energy. Nuclear energy however, is an important step towards reducing carbon emissions. Excluding nuclear energy from energy plans will lead to a rise in reliance on potent fossil fuels like coal and natural gas, resulting in greater carbon emissions, even with an emphasis on expanding …

Photo Identification On Interactions Between Tursiops Trucatus And Humans To Promote The Importance Of Sustainability, Julia Bronneberg

Undergraduate University Honors Capstones

The Mediterranean Sea is one of the most biodiverse regions, and especially around the Maltese islands, a popular tourist destination where people come to enjoy the beautiful weather and blue waters. Because bottlenose dolphins (Tursiops truncatus) are the most common species people see in coastal areas, they are the primary focus of this research. We care about these bottlenose dolphins because they cannot protect themselves if we are the ones accidentally causing them harm. This study starts from the belief that if we cannot protect the ocean and marine life, then we cannot protect ourselves. We use many resources that …

Life Histories Of Two Sgcn Procambarus Species In East Texas, Mckenzie A. Adkins

Biology Theses

Within freshwater systems, crayfish play notable roles by shaping habitats and linking food web levels. Yet even with such influence, knowledge about numerous species is incomplete, which hinders protection strategies. Found only in the Neches River basin in eastern Texas, Procambarus nechesae and Procambarus nigrocinctus have different conservation statuses, mainly because data on their life history remains sparse. These two species are not closely related and are analyzed independently in this study. Research into traits tied to survival and environmental preferences was carried out so that informed decisions on conservation efforts can be made for these species. The goal of …

Teacher Shortages In Arkansas Rural School Districts: Employed Teacher’S Perceptions Of The Impact On Their Effectiveness, Carloss Guess

ATU Theses and Dissertations 2021 - Present

ABSTRACT

TEACHER SHORTAGES IN ARKANSAS RURAL SCHOOL DISTRICTS: EMPLOYED TEACHERS’ PERCEPTIONS OF THE IMPACT

ON THEIR EFFECTIVENESS

Carloss Guess

Teacher shortages in rural school districts remain a persistent challenge that affects instructional quality, teacher workload, and professional sustainability. The purpose of this qualitative phenomenological study was to explore how teachers in rural Arkansas perceive the impact of staffing shortages on their instructional roles, workload, and professional well-being. Data were collected through semi-structured interviews with 10 K–12 teachers representing elementary, middle, and high schools and across varying career stages. Interview transcripts were analyzed using an inductive qualitative approach and the constant …

Effects Of Increased Salinity On Mississippi Coast Bacterial Community Composition And Diversity, Clifton C. Wade

Honors Theses

Bacterial communities are important to ecosystem function in coastal environments, but the response of these communities to short term increased salinity conditions is understudied. This study utilized a microcosm setup to investigate the response of coastal seawater bacterial communities to three treatments: an unamended seawater control, a reference treatment that received reverse osmosis (RO) water, and an elevated salinity treatment that received artificial seawater dissolved in RO water. Microcosms were sampled four times over a five-day period to analyze the effects of time under different salinity conditions on the seawater bacterial community. 16S rRNA gene sequencing was used to analyze …

Service-Learning In Adapted Physical Activity: Student Experiences With And Without Course Integration, Courtney Jost, Nicole Fiscella Nicole Fiscella, Roxanne Bahn-Bales, Tze-Hsuan Wang, Jennifer Beamer, Jennifer Taylor, Willie Chun Wai Leung

Educational Practices in Kinesiology

Service-learning is widely used in adapted physical activity/education (APA/APE) courses to enhance student learning through community engagement. However, limited research has explored how the presence or absence of an APA/APE course influences students’ perceived learning, confidence, and engagement in inclusive physical activity settings. This quasi-experimental, cross-sectional study examined how course-enhanced and purely experiential models of a university-based APA service-learning program, PA PALS, shaped undergraduate students’ experiences. Students (N = 58) participated; 41.4% (n = 24) were concurrently enrolled in an APA/APE course (course-enhanced group), while 58.6% (n = 34) participated as volunteers (purely experiential group). A validated …

Studying More, Not Less: Rethinking Test Anxiety In Undergraduate Biology Courses, Kailey E. Reeves

Honors Theses

This study investigates the relationships among test anxiety, study behaviors, and metacognitive evaluation in undergraduate biology courses. While prior research has established that study strategies and metacognition influence academic performance, less is known about how these factors interact with test anxiety in undergraduate Biology courses. Guided by the student approaches to learning (SAL) and metacognition frameworks, this study examines whether test anxiety is associated with the type and number of study strategies students use, as well as their ability to evaluate their own learning and preparedness. Using a convergent parallel mixed-methods design, data was collected from 205 students enrolled in …

Mechanisms Underlying Diversity In Bacterial Biofilms, Jacob David Holt

Dartmouth College Ph.D Dissertations

Bacteria commonly exist in natural environments as communities of multiple strains and species attached to surfaces and encased in an extracellular matrix of DNA, protein, and polysaccharides–termed biofilms. These biofilms contribute to diverse functions, from ocean carbon cycling via chitin degradation to pathogenic processes such as wound or implant colonization. The molecular mechanisms governing biofilm formation and composition have been well characterized in model pathogenic organisms, yet the extent to which aspects of biofilm formation contribute to the assembly and maintenance of diverse communities remains less well understood. Using microfluidics, confocal microscopy, and model biofilm-forming bacteria, this thesis details how …

Green Infrastructure As A Strategy For Revitalizing Old Residential Neighborhoods: Evaluation Of Carbon Footprint And Energy Performance - Case Study Of Heliopolis, Cairo, Ahmad Abouisaadat, Eman Gameel, Shoroq Adel

Mansoura Engineering Journal

This study aims to address the challenge of reducing energy consumption and greenhouse gas (GHG) emissions in urban areas, particularly in aging residential neighborhoods. Despite the benefits of Urban Green Infrastructure (UGI) and residential retrofitting, current research often examines these strategies separately, leaving a gap in understanding their combined impact at the district scale. The research proposes a methodology that integrates GIS-based spatial analysis, Urban Building Energy Modeling (UBEM), and Life Cycle Assessment (LCA) to evaluate the effects of UGI (e.g., green roofs, urban trees) and retrofitting strategies on energy use, CO2 reduction, and urban microclimates. The study will provide …