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Commodity Diversification, Technological Innovation, And Market Dynamics: Insights Into Beef Cattle Production And Feeder Cattle Basis In The United States, Nik Berg

All Theses

The beef cattle industry plays an important role in the agricultural economy, contributing to both domestic food supply and global trade. The United States is one of the world's largest producers of beef, with production systems varying widely across regions largely due to differences in available resources and market structures. Market conditions, technological advancements, and policy interventions shape the way producers operate, making research into these factors essential for both industry stakeholders and policymakers.

Producers are continuously adapting to changing economic conditions, environmental challenges, and evolving consumer preferences. By analyzing these factors, researchers can provide insights to support informed decision-making …

Effect Of Amino Acid Derivatives And Polyphenol Supplementation On Skeletal Muscle Growth In-Vitro And In-Vivo, Gabriella C. Iheanacho

All Theses

Background

Satellite cells (SCs) are myogenic precursor cells that play a crucial role in muscle growth, and their activity can be influenced by nutrient supplementation. Muscle growth can also be stimulated using growth-promoting hormones; however, there are no approved growth hormones for use in sheep in the United States (Qaid & Abdoun, 2022). This limitation highlights a need to identify alternative compounds that would serve as nutrient supplements to enhance muscle growth and thereby improve meat production. Amino acid derivatives such as guanidinoacetic acid (GAA) and 5-hydroxytryptophan (5-HTP), along with the polyphenol quercetin, are naturally derived compounds that have shown …

Evaluating (Bio)Degradation Of Carbon Tetrachloride In Fe(Iii)-Reducing Environments, Adam Rogers

All Theses

Understanding degradation of carbon tetrachloride in-situ is vital for many remediation projects across the world, yet conclusive evidence of its feasibility is lacking in previous studies.

The main objective of this research is to assess the potential for carbon tetrachloride attenuation by biological, abiotic, and combined processes in a Fe(III)-reducing aquifer. In doing so, it assesses the effect of pH and stoichiometric ratio on abiotic degradation of carbon tetrachloride using various reducing agents, evaluates iron-mediated versus direct biotic degradation of carbon tetrachloride using pure cultures under resting and growth conditions, and characterizes the effects of culture strain, electron acceptors and …

Systematics Of African River Frogs (Anura: Pyxicephalidae: Amietia) In Central Africa, With The Description Of Two New Species, Jesus Manuel Reyes

Open Access Theses & Dissertations

Amietia is a pyxicephalid anuran genus that is prevalent throughout central, southern, and eastern portions of sub-Saharan Africa. Recent phylogenetic studies have been in conflict regarding the validity and composition of several Amietia species in the Albertine Rift region. The goals of this study are to: (1) generate an updated molecular phylogeny for Central African Amietia with new sampling; (2) clarify the relationship between the previously unsampled taxa A. amieti and A. chapini; (3) clarify the status of A. desaegeri; and (4) confirm the taxonomic status of potentially new species. Maximum likelihood and Bayesian inference methods were used to generate …

Unl Emeriti And Retirees Association Newsletter, August 2025

UNL Emeriti and Retirees Association: Newsletters and Other Materials

University of Nebraska-Lincoln Emeriti and Retirees Association Newsletter, August 2025

President's message: Continuing our commitment, Pam Edwards

Welcome to new members

Wake up your well-being

Book review, Atlas of the Heart

A look ahread at programming

Recapping past programming

Memory moments

Two Essays On Index-Based Risk Management In U.S. Rangeland And Livestock Production, Wajdi Belgacem

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

This dissertation investigates two distinct but complementary dimensions of risk management in United States rangeland agriculture. Essay 1 measures spatial variation in basis risk within the Pasture, Rangeland, and Forage (PRF) rainfall-index program for 176 Nebraska grid cells (1988–2023). By linking official NOAA rainfall indices with 30-m Rangeland Analysis Platform biomass estimates, we find rainfall–forage correlations that peak at 0.45 but display pronounced heterogeneity. The probability that neither insured interval triggers during an actual forage loss averages 12%, rising to nearly 30% in several Sandhills cells, whereas optimally pairing late-spring and summer intervals reduces complete misses below 10%. These results …

Redressing The Harm Of Accelerated Approval, Laura Karas

Articles

The accelerated approval pathway of the United States Food and Drug Administration (FDA) enables drugs to come to market more quickly than would be possible under a traditional FDA approval pathway. Accelerated approval is based upon the agency's determination that changes in a surrogate or intermediate clinical endpoint are "reasonably likely" to predict a clinical benefit meaningful for patients. In essence, the pathway affords sick patients earlier access to potentially beneficial drugs while trials to confirm clinical benefit continue. Accelerated approval has been likened to a social compromise in which promising drugs enter the market sooner in exchange for a …

Ai Governance In China: A Tale Of Three Digital Empires, Charles C. Wang, Siyi Lin, Xia Wu, Yiman Li

UC Law SF International Law Review

Since 2021, China has strategically expedited artificial intelligence (AI) legislation and refined algorithmic governance to compete with the US and the EU. The rapid growth of algorithm filing cases is a direct result of the “Made in China 2025” Initiative which prioritizes AI development driven by domestic leading tech companies like DeepSeek. As world-class digital powers, China, the US, and the EU diverge in their categorization of AI risks and adoption of regulatory measures. China’s centralized single-agency regulatory infrastructure differs from the multi-agency and decentralized governance models in the US and the EU, respectively. China does not impose the same …

Modeling U.S. Corn Production Archetypes In The Agricultural Policy/Environmental Extender Model To Generate Life Cycle Assessment Inventory Data, Brandon Taylor

Graduate Theses and Dissertations

Corn (Zea mays) is an important crop grown across the US for many uses such as grain for animal feed, bio-ethanol production, food products, and industrial products. Corn is produced in almost every state in the US, but most corn production is concentrated in the Corn Belt Region including Iowa, Illinois, Ohio, Indiana, Minnesota, and Nebraska. Although technologies and production practices are improving corn production efficiency primarily through increased yields (improved land use), corn production at this scale greatly impacts the environment through emissions from fertilizer and pesticide runoff and leaching, soil degradation due to improper field practices, as well …

Multivariate Optical Imaging Of The Oxygen-Metabolism Axis, Jesse D. Ivers

Graduate Theses and Dissertations

Metabolic reprogramming is a characteristic hallmark of multiple pathologies and promotes disease progression, survival, and severity. Current methods to investigate metabolic reprogramming, however, require reductions of dimensionality both because of instrumentation limitations and analysis tools. This work aims to define a blueprint for high dimensional study of the oxygen metabolism axis to enable more sensitive study metabolic reprogramming. We hypothesized (1) multivariate imaging of metabolic and oxygenation metrics in ex vivo tissue sections would elucidate differences in resistant and sensitive head and neck squamous cell carcinoma (HNSCC) xenografts that traditional uni-variate methods miss and (2) an engineered hyperspectral darkfield microscopy …

Controlling Electroless Deposition On Polymer Interfaces Towards Discrete Functional Particle Synthesis, Grecia Pierina Alvarado Munoz

Graduate Theses and Dissertations

Electroless deposition is a process that facilitates the formation of metal layers on surfaces through the reduction of metal ions onto a surface in the presence of a sacrificial reducing agent. This process can be applied to synthesize conductive metal layers on insulators such as glass or polymers. The kinetics of heterogeneous deposition depend on the interfacial surface chemistry, including the presence of added catalyst materials, as well as the bulk chemical environment, such as the concentration of metal ions and sacrificial reductants. Furthermore, the homogeneous formation of metal nanoparticles may compete with the deposition reaction, adversely affecting the control …

The Lasting Impact Of Childhood Maltreatment On Parenting: A Qualitative Study, Leslie K. Moorman

Theses, Dissertations and Culminating Projects

This qualitative study explored how Child Protection Service (CPS)-involved parents made meaning of their parenting and what informed their meaning making. Bronfenbrenner’s Person Process Context Time (PPCT) framework was utilized to examine the context of parenting within the CPS system. The PPCT theoretical assumptions were used to discuss the results of the study. Semi-structured interviews were conducted with 10 participants, from diverse ethnic backgrounds. All but one returned for a second interview. The CPS-involved parents disclosed childhood experiences that were consistent with childhood maltreatment. The participants were preoccupied with stories of their own childhood and not wanting to parent like …

Assessing The Impact Of Pll And Ple Concentrations And Aging On Protein Condensates Formation Via Llps, Nabil Harche

Theses, Dissertations and Culminating Projects

Protein droplets, also referred to as condensates, are membrane-less organelles formed through a biophysical process known as liquid-liquid phase separation (LLPS). These structures play an indispensable role in a wide range of cellular functions, including compartmentalizing biochemical reactions, regulating gene expression, and responding to cellular stress. Unlike traditional membrane-bound organelles, these condensates form dynamically and reversibly within the cytoplasm or nucleus, without the need for lipid membranes. The formation of these protein droplets is affected by several physicochemical factors, including pH, temperature, ionic strength, concentration of biomolecules, and specific molecular interactions such as electrostatics and hydrophobic forces. LLPS results in …

Crustose Coralline Algae Accretion In A Kelp Forest Ecosystem In Southern New England, Usa, Ruimeng Liu

Theses, Dissertations and Culminating Projects

Temperate reef ecosystems are experiencing rapid canopy loss of kelp and the proliferation of algal turf. However, the consequences of these changes for crustose coralline algae (CCA)— a key but often overlooked benthic calcifier—are poorly understood. Here, I study CCA recruitment patterns in southern New England, USA, using standardized settlement tiles at two field sites over 12 months (September 2023 – August 2024). I measure CCA accretion rates and the associated biological and environmental correlates of CCA recruitment. At the two sites, CCA accretion rates ranged from 0.0259 to 1.215 mg CaCO3 cm⁻² yr⁻¹, with an average of 0.441 mg …

Electrophysiological Markers Of Emotion Dysregulation In Autistic Youth, Rachel G. Mcdonald

Theses, Dissertations and Culminating Projects

Emotion dysregulation (ED) is a transdiagnostic mechanism that is conceptualized as difficultly regulating emotions and deploying appropriate regulation strategies in response to environmental stimuli. Meta-analyses suggest that autistic people, across the lifespan, experience more severe ED as compared to both neurotypical people and those with mental health conditions. Despite elevated risk and evidence linking ED to disruptions in neural mechanisms, no studies to date have examined neural markers of ED in autistic populations. The current project uses multi-method and multi-informant measurement to examine similarities and differences in neural mechanisms of ED in autistic and non-autistic populations. Forty-four youth aged 11—17 …

Mind Mentor, The Workplace Mental Health Navigator: Evaluating The Utility Of A Self-Paced Web-Based Mental Health Awareness Training For Supervisors, Lauren Offermann

Theses, Dissertations and Culminating Projects

The growing prevalence of mental health challenges in the workplace – such as anxiety and depression, burnout, suicide, and substance abuse – has increased demand for evidence-based supervisor training programs that promote psychological well-being. This study evaluated the effectiveness of Mind Mentor: The Workplace Mental Health Navigator, a 1.5-hour, web-based, self-paced adaptation of the Mental Health Awareness Training (MHAT; Dimoff, 2016) for supervisors. The training aimed to enhance mental health knowledge, awareness, self-efficacy, and supportive behaviors among U.S.-based supervisors with at least one direct report. Using a pre/post/follow-up design (baseline N = 51, immediate post-test N = 35, and 4-week …

"It's A Calling That Won't Let You Rest": The Experiences Of Counselor Educators Of Color Who Teach Social Justice, Sunanda M. Sharma

Theses, Dissertations and Culminating Projects

Social justice advocacy has been described as a foundational ethical duty for all professional counselors (American Counseling Association, 2014). Counselor educators of color (CEOCs) have advocated for the advancement of multiculturalism and social justice in counseling (Sue et al., 1992; Vera & Speight, 2003). However, their lived experiences are not well-accounted for in the counseling literature. Grounded in critical race theory (CRT) (Delgado & Stefancic, 2017), this phenomenological study sought to explore the lived experiences of CEOCs who teach students to engage in systemic social justice advocacy (SSJA). Eleven participants described the essence of their experiences and four themes emerged …

The Lived Personal History Of Queer Teachers Engaged In Queer Pedagogy, Michael C. Shera

Theses, Dissertations and Culminating Projects

This study examines a group of five queer teachers of varied ages and genders who discussed their lived experiences navigating the heteronormativity of public school structures in conjunction with their work using queer pedagogy to support students. It answers the research question: How does the lived personal history of queer educators influence how, when, and in what ways they take up queer pedagogy? Employing a life history interview methodology, along with queer theory as a theoretical framework, this study explores intersections of the participants’ life history and their engagement in queer pedagogy to examine why and how they are driven …

Comparative Expression Of Cgmp-Dependent Protein Kinase G (Pkg) From Plasmodium And Toxoplasma, Tsopmo Asaah

Theses, Dissertations and Culminating Projects

Malaria and Toxoplasmosis are life threatening diseases to humans. The search for a cure and control of these diseases is still one of the major challenges of scientists worldwide. In this research we focused on two Malaria species; Plasmodium bergei² (Pb) and Plasmodium falciparum¹ (Pf) and also on Toxoplasma gondii. Part of the life cycle of these organisms is regulated by the enzyme cyclic GMP-dependent protein kinase G (PKG)⁴. This is our drug target in this research. We believe that inhibiting this enzyme will be a great step in fighting these diseases. In this research, we devised a comparative study …

Regulation Of Icer Degradation And Its Role In Melanoma, Justin Wheelan

Theses, Dissertations and Culminating Projects

Melanoma is the deadliest form of skin cancer, with 100,640 new cases and 8,290 deaths estimated in the United States in 2024. While targeted therapies and immunotherapy have improved patient outcomes, resistance remains a major challenge, necessitating new therapeutic approaches. Approximately 50% of melanomas harbor BRAFⱽ⁶⁰⁰ᴱ mutations, leading to constitutive MAPK pathway activation. Targeted small molecule therapies such as BRAF and MEK inhibitors are available and initially reduce tumor burden, however resistance frequently occurs, likely through many pathways including compensatory activation of cAMP signaling. ICER (Inducible cAMP Early Repressor), a transcriptional repressor of CREB-mediated gene expression, is absent in melanoma …

A Pilot Study Exploring Vitamin D, Mental Health, And Gastrointestinal Health In Humans, Brianna C. Williams

Master's Theses

Mental disorders are experienced by nearly one billion people worldwide. Depression is one of the most common. Treatments exist, yet a devastating 75% of individuals suffering from depression do not receive adequate treatment. An emerging treatment strategy includes exploring the connection between mental health and nutrition, which includes the areas of gut health and nutrient deficiencies. Vitamin D is obtained through food, supplements, and sunlight. Many individuals are considered deficient (25[OH]D concentrations < 12 ng/mL) or insufficient (25[OH]D concentrations < 20 ng/mL). Purpose: This study aimed to explore mental and gastrointestinal (GI) health using surveys and lipopolysaccharide binding protein (LBP) concentrations, a biomarker of GI health, in individuals considered 25(OH)D deficient (DEF) vs not deficient (N-DEF). Methods: This cross-sectional study recruited physically active participants aged 18-45 years who underwent three evaluations in one visit. Health was assessed using surveys to evaluate mental health, GI symptoms, and vitamin D intake. Serum from fasting blood samples was used with an enzyme-linked immunosorbent assay to determine 25(OH)D and LBP concentrations. Unpaired t-tests were used to compare DEF vs N-DEF and significance was set at p < 0.05. Results: Thirty-two participants (mean age 25.3 ± 6.3 years) with mean and body fat percentage of 24.0% ± 10.7%, were placed into DEF (n=16) and N-DEF (n=16) categories. Interestingly, five of the 16 participants in DEF (31%) showed some level of depression (scores ranging from mild to severe) and only two of the 16 participants in N-DEF iv (13%) scored positively in the depression category (scores ranging from mild to moderate). Additionally, the participant with the lowest 25(OH)D concentration (5.42 ng/mL) was the only participant to meet the “severe” depression category criteria, with a score of 24 compared to other participants who scored within 0-16. Also, the only participant who scored “severe” in the stress category, was in the bottom 20% of 25(OH)D concentrations. As for GI health, the difference between average GI scores and average serum LBP concentrations between the groups were not statistically significant. Conclusion: There were no significant differences between DEF and N-DEF in perceived depression (p = 0.16), anxiety (p = 1.0), stress (p = 0.96), GI symptoms (P values ranged from 0.27 to 1.00), nor in LBP concentrations (p = 0.77). Funding: Support was received from the Graduate Student Association and College of Natural Health Sciences at the University of Northern Colorado.

Investigating The Influence Of Experimental Parameters On The Formation Of Gold Nanoparticles: A Green Synthesis And Design Of Experiments Approach, Isaac Opeyemi Subuloye

Master's Theses

This thesis examines the green synthesis of gold nanoparticles using catechin, a naturally occurring plant-derived compound, as both a reducing and capping agent. The synthesis process was guided by a structured Design of Experiments (DOE) methodology to ensure systematic investigation and optimization. A two-phase experimental approach was adopted. First, a full factorial screening design was used to evaluate the effects of catechin concentration, NaOH concentration, and pre-reaction time. This was followed by an optimization phase using a face-centered composite design to identify conditions that produce nanoparticles with ideal characteristics. The nanoparticles were analyzed using UV-visible spectroscopy and dynamic light scattering …

Cultivating Identity, Workforce Readiness, And Heutagogical Lifelong Learning: The Case For Student-Trained Ai Agents In Postsecondary Education, James Hutson

Faculty Scholarship

The accelerated integration of human-centered artificial intelligence and human-computer intelligent interaction (HCII) into postsecondary education has inaugurated a paradigm shift in how learners develop cognitive, socio emotional, and professional competencies. This article argues that requiring students to iteratively build and refine custom AI agents—digital “clones” or GPTs trained on their evolving beliefs, knowledge, values, and interests addresses three pressing challenges facing contemporary higher education. First, the process of self-modeling via agent training compels deep self-reflection, fostering socio-economic development and identity formation during the critical neurodevelopmental period that extends into the mid-twenties. Second, as industry trends increasingly prioritize the creation of …

Examining Employers’ Perspectives Relating To Early College High School Programs And Employability Skills, Kathleen Mcguigan

Education Doctoral

This phenomenological qualitative research study examined employer perspectives on the employability skills of graduates from Early College High School (ECHS) programs. The study investigated the program components that enhance the preparation of employability skills and the systems that support graduate transition to the workforce. Using semi-structured interviews with employer partners and an iterative coding process, three key themes emerged across the data. The key themes highlight the importance of factors relating to workplace readiness, including internships and experiential learning, behavioral and soft skills, and structured transition systems, as critical components in preparing ECHS graduates for employment.

The findings indicate that …

An Examination Of How Black Church Leaders Support The Long-Term Impact Of Trauma In The Black Community: A Qualitative Transcendental Phenomenological Study, Loretha J. Mccullough

Education Doctoral

The prevalence of mental illness due to untreated childhood trauma continues to be a concern, particularly for Black people. The consequence of obtaining formal treatment is perceived to be discriminatory and stigmatizing in the Black culture. Instead, the preferred method of treatment is religious coping. The purpose of this transcendental phenomenological study was to examine how Black clergy leaders support the long-term impact of trauma in the Black community. The primary source of data collection was semi-structured interviews. These interviews captured the essence of how Black clergy leaders described their preparedness to effectively advise, and counsel congregants on mental health …

Synthesis And Characterization Of Polymer-Coated Metal Nanostructures And Gelatin-Incorporated Hydrogels For Biomedical Use, Deborah Takyibea Okyere

Graduate Theses and Dissertations

The development of advanced materials for disease management and treatment presents a pressing challenge in the health sector. The overall objective of this research is to contribute to the development of advanced materials with tailored properties for biomedical applications, with a focus on cost-effective and robust nanoparticles and biomaterials. The first part of this work focuses on designing and synthesizing earth-abundant copper nanoparticles with desired optical properties. Copper nanoparticles, which provide a more affordable alternative to gold and silver, are being investigated due to their unique plasmonic properties. However, their susceptibility to oxidation limits their application. To address this challenge, …

A Multicomponent Microneedle Patch For The Delivery Of Meloxicam For Veterinary Applications, Katherine Alejandra Miranda Munoz

Graduate Theses and Dissertations

Veterinary medicine requires innovative drug delivery strategies to enhance therapeutic efficacy while minimizing stress and handling. This dissertation explores the development and application of biodegradable microneedle patches for the transdermal delivery of meloxicam in livestock, offering a minimally invasive alternative to traditional administration methods. The research investigates the fabrication and characterization of microneedles using polyvinyl alcohol, collagen, and chitosan blends, demonstrating their mechanical strength, biocompatibility, and ability to facilitate sustained drug release. In vitro and in vivo evaluations confirm effective skin penetration, dissolution, and localized drug delivery. Pharmacokinetic studies highlight anatomical site-dependent variations in drug absorption, emphasizing the need for …

Advancing Point-Of-Care Diagnosis Of Joint Infection Using A Diffuse Reflectance Spectroscopy (Drs) System, Erin Elizabeth Drewke

Graduate Theses and Dissertations

Septic arthritis is a severe joint infection that can rapidly destroy cartilage and cause lifelong disability if not diagnosed and treated promptly. Faster, bedside diagnostic tools are needed to reduce delays and support timely treatment decisions while preserving standard laboratory workflows. A syringe-mounted diffuse reflectance spectroscopy (DRS) system was developed for rapid, sterile, point-of-care measurement of synovial fluid optical properties. Broadband light (400–650 nm) was delivered and collected through the syringe barrel without contaminating the sample. An empirical lookup table (LUT) and a boundary-aware Monte Carlo (MC) model were implemented to extract absorption (μₐ) and reduced scattering (μs′) coefficients from …

Effects Of Flavonoids On Reducing Colon Cancer Risk Via Macrophage Polarization, Gracien Jules

Graduate Theses and Dissertations

Colorectal cancer is one of the most fatal diseases in the United States. Chronic tissue inflammation can cause cell proliferation, which leads to tumor formation and cancer development. Macrophages are responsible for maintaining tissue homeostasis and for inflammatory responses. M1 macrophages exhibit proinflammatory responses while M2 macrophages exhibit anti-inflammatory responses. Imbalance between M1 and M2 macrophages is closely related to inflammation-associated disease development. The anti-inflammatory effects of apiaceous vegetable constituents, specifically flavonoids, have been studied for their preventative effects towards reducing disease risk. However, sufficient evidence is lacking on the mechanisms by which flavonoids impact M1/M2 macrophage polarization. RAW 264.7 …

Examining Associations Between Internalized Racism, Psychological Flexibility, And Well-Being Among Bipoc, Cerella Chandra

Dissertations

Internalized racism has been defined as the adoption of negative stereotypes related to one’s racial/ethnic group and associated with psychological distress. There is little research on the effectiveness of Acceptance and Commitment Therapy (ACT) on diverse populations, but recent intervention studies have indicated that psychological flexibility may counter the negative psychological effects of self-stigma. The purpose of this study was to examine the relationship between internalized racism, psychological flexibility, and psychological distress and life satisfaction among Black, Indigenous, and People of Color (BIPOC). Self-report data was collected using Qualtrics with prospective participants recruited from a large public university in the …