Digital Commons Network^™

Influence Of Different Rates Of Biochar And Deer Browsing On Pollinator Plant Productivity, Bipana Bhusal

Graduate Theses, Dissertations, and Problem Reports (ETD)

Biochar, a carbon-rich material produced from biomass, has received wide attention for soil amendment to improve plant growth. However, its specific effects on pollinator friendly plants remain poorly understood. In this study, we evaluated the effects of four biochar application rates (0, 10, 20, 40 tons/acre) and deer exclusion (fenced vs. unfenced) on the productivity of three pollinator species; Buckwheat (Fagopyrum esculentum), Plains Coreopsis (Coreopsis tinctoria), and Black-eyed Susan (Rudbeckia hirta) in a utility right of way with a history of mining. A split-plot randomized design was used, and the results were analyzed using …

Microbial And Plant Biodiversity In Appalachian Agroecosystems And Their Implications For Soil Health, Kinsey Reed Close

Graduate Theses, Dissertations, and Problem Reports (ETD)

The sustainability of agricultural landscapes depends on understanding the complex interactions between plants, soil, and microbes. In Appalachia, a region shaped by complex terrain and long histories of human and ecological interaction, small family farms produce hay, livestock, and row crops. These agroecosystems, though often treated as “artificial” by many ecologists, have the potential to support both food production and biodiversity conservation if managed with an understanding of ecological complexity. This dissertation examines how plant and microbial diversity interact with soil and management to influence nutrient cycling, soil health, and long-term resilience in Appalachian agricultural systems. A literature review revealed …

2025 Annual Report, Tennessee. Division Of Forestry And Tennessee. Department Of Agriculture

Forestry Annual Reports

This annual report presents an overview of Tennessee Forestry Commission programs and management.

Quantifying Modifiable Lifestyle Behaviors And Influences Associated With Preventable Cancers In Selected Rural Counties: A Mixed Method Study, Jecinta Scott

Dissertations and Theses

Cancer is the second leading cause of death in the United States disproportionately affecting rural communities. This dissertation study investigates the involvement of rural communities in lifestyle behaviors associated with increased risk of cancers, the impact of socioeconomic factors, and what influences their behavior and the impact of political party affiliation. The study was conducted using a mixed-method quantitative data analysis enhanced by qualitative interviews. It began with an extensive literature review to identify existing research, and evidence gaps on the topic. Data collection involved retrospective quantitative extraction from the Centers for Disease Control and Prevention’s Behavioral Risk Factor Surveillance …

Understanding Food Insecurity Among International Students At Ohio University, Kyle Butler, Joshua Osondu

Sustainable Living Hub Reports and Publications

Recently, food insecurity has emerged as a concern among the student body of Ohio University (OHIO), particularly among its international graduate students. This survey study was undertaken to provide data to inform OHIO’s response to food insecurity among its international graduate students.

Evaluating The Condition Of Age-0 Burbot In Relation To Diet, Cian Verbridge

Journal of Earth and Life Science

Burbot are becoming more and more popular for angling and aquaculture. However, populations have been declining across the world. Very little information is available about their early life and their interactions in the ecosystem due to challenges in sampling. Condition estimates and diet metrics were used to better understand the status of burbot in Lake Bemidji. Using backpack electrofishing, 45 young of the year burbot were collected. The lengths ranged from 86 to 146 mm and the wet weights ranged from 4.29 to 24.36 g. The stomach contents were removed and stored in ethanol for later analysis. The burbot were …

Modeling Wild Rice Bed Health: A Dual Metric Approach For Bed Strength And Invasive Impact, Seth Sisneros-Martinez

Journal of Earth and Life Science

Wild rice (mannoomin; Zizania palustris) is an aquatic grain that grows in slow-moving rivers and shallow bays throughout northern Minnesota. In Headquarters Bay on Leech Lake, wild rice has served as a cultural staple for Indigenous communities for centuries. However, its population has declined in recent years due to multiple environmental issues. One potential contributor is Eurasian watermilfoil (Myriophyllum spicatum; EWM), an invasive species that forms dense mats capable of outcompeting native aquatic vegetation, including wild rice. EWM was first recorded on the southern shoreline of Leech Lake in 2005 and has since become widespread. This study …

René Dubos: An Annotated Bibliography, Carol L. Moberg

René Dubos: An Annotated Bibliography

René Dubos (1901–1982), a prominent 20th century scientist, humanist, and philosopher, was a prolific author. Affiliated for more than 50 years with The Rockefeller Institute for Medical Research/The Rockefeller University, his studies ranged from antibiotics and the role of bacteria in human diseases to formulating broad ecological and environmental questions affecting human health and disease. His seminal writings explore a lifelong belief that a living organism—whether microbe, human being, society, or the Earth itself—could be understood only through its relationships with everything else.

This comprehensive bibliography of more than a thousand works by René Dubos includes brief annotations for each …

Germline Genetic Modulator Of Cancer Metastasis, Wenbin Mei

Student Theses and Dissertations

Metastasis formation is the most critical determinant of cancer survival outcome. Identifying patients at risk for metastatic relapse facilitates clinical decision and the use of appropriate adjuvant therapy, thus having a profound impact on patient survival. A central dogma in cancer is that during tumorigenesis, cancer cells acquire somatic mutations that regulate metastatic likelihood during evolution of the primary tumor. However, despite extensive tumor sequencing efforts, such causal somatic metastasis driver mutations have not been found, limiting the discovery of biomarkers, mechanisms and drug targets of cancer metastasis. In this thesis, I report a germline genetic driver of breast cancer …

Sequential Transcriptional Gates In The Thalamo-Cortical Circuit Coordinate Memory Consolidation, Andrea Terceros

Student Theses and Dissertations

How are memories maintained over weeks, months or even years? The molecular mechanisms that enable memories to persist over long time-scales remain poorly understood. As a point of entry, recent work in our lab revealed that beyond the hippocampus, where memories are initially formed over hours/days, the thalamo-cortical circuit is important for the gradual stabilization of memories over weeks/months. In this thesis, I aimed to reveal the molecular mechanisms operating in the thalamo-cortical circuit that may be responsible for extending memory time-scales. I began by developing a virtual reality-based behavioral paradigm where, by varying the frequency of learned associations, mice …

The Evolution Of Ribosome Assembly: Making Ribosomes In The Mitochondria, Chloe Burnside

Student Theses and Dissertations

Mitochondrial ribosomes (mitoribosomes) synthesize proteins encoded within the mitochondrial genome that are assembled into oxidative phosphorylation complexes. As such, the biogenesis of mitoribosomes is essential for ATP production and cellular metabolism. Despite significant progress in elucidating the structures of mature mitoribosomes, a comprehensive understanding of their assembly pathways remains elusive. This thesis presents the first structural characterization of assembly intermediates of the mitochondrial small subunit (mtSSU) in eukaryotes. To gain mechanistic insight into the process of SSU assembly in the mitochondria, I set out to enrich and characterize intermediates of SSU assembly in the mitochondria of S. cerevisiae. By employing …

The Spatiotemporal Dynamics Of Nomadic Behavior In The Clonal Raider Ant, Ooceraea Biroi, Dennis Octavio Melendez

Student Theses and Dissertations

Nest relocation is integral to the lives of many social insects. Army ants have taken this behavior to the extreme, with many species relocating an entire colony of over 100,000 ants plus brood almost daily. Despite its prevalence, the question of how army ant colonies emigrate has been debated for many decades, and still awaits a definitive answer because conducting well-controlled field experiments with their massive and aggressive colonies is challenging. In ants, the Dorylinae subfamily has given rise to most known army ants. Therefore, performing experiments in non-army ant dorylines that can be maintained in a laboratory setting presents …

Serotonin-Mediated Sickness Behavior, Audrey Harnagel

Student Theses and Dissertations

Serotonin is an ancient and powerful neuromodulator that regulates diverse processes from fundamental physiology to complex emotions. Due to the many functions of serotonin distributed throughout the body and brain, governing principles of serotonin signaling have remained elusive. There is particular interest in how serotonin modulates internal states given that serotonin dysregulation is a feature of many psychiatric diseases. In this thesis, I use the simplified serotonergic system of C. elegans to explore how serotonin governs the internal state of sickness. In addition to activating the immune system and remodeling physiology, pathogenic infection results in adaptive behavioral changes that promote …

A Neuronal Circuit Motif For Leaky Vector Integration, Abby Janke

Student Theses and Dissertations

To efficiently navigate their environments, animals ranging from insects to humans can keep track of their trajectory by continuously summing their direction and distance traveled over time. It is not clear how brains perform this fundamental computation––known as path integration––even though neural correlates and computer models abound. In arthropods, spatial-cognition related processes such as path integration are thought to be implemented in the central complex. Experimenters have shown that contiguously arrayed populations of neurons in the Drosophila fan-shaped body, a substructure of the central complex, display sinusoidally shaped bumps of calcium activity that signal vectors relevant for spatial navigation. The …

Mechanisms And Evolution Of Mitoribosomal Small Subunit Biogenesis, Nathan Harper

Student Theses and Dissertations

The ribosome is the macromolecular machine responsible for all protein synthesis in the cell and is one of the ancient molecular machines involved in the transfer of genetic information to functional molecules. The ribosome is made up of two conserved ribonucleoprotein complexes: the large subunit, responsible for peptide bond synthesis, and the small subunit, responsible for interrogating the match between mRNA codon and tRNA anti-codon. The assembly of the ribosome is a complex process which is tightly controlled to generate functional subunits which exhibit high translational accuracy and processivity. During ribosome biogenesis, ribosomal proteins and a multitude of additional assembly …

Neuromast Optogenetics Reveals Rules Of Spatial Encoding In The Zebrafish Lateral Line, Nicolas Velez-Angel

Student Theses and Dissertations

For animals to respond effectively to their environment, their sensory circuits must learn to distinguish between similar patterns of sensory information. A lingering question in neuroscience is how neuronal circuits achieve this performance. In this study, I use the posterior lateral line (pLL) of larval zebrafish to address this question. In the wild, the pLL must differentiate among a variety of hydrodynamic stimuli. However, understanding how fish distinguish between different water-flow stimuli has been challenging due to difficulties in stimulating individual neuromasts. To tackle this, I introduce a novel method in this thesis that combines single-neuromast optogenetics with whole-brain calcium …

Decoding Dynamic Gene Regulation In Hair Cell Development And Regeneration, Caleb C. Reagor

Student Theses and Dissertations

Identifying the causal interactions between genes and their proteins during the differentiation of specialized cells such as mechanosensory hair cells in vertebrates' inner ears and fishes' lateral lines requires an accurate description of the time-lagged relationships between transcription factors and their target genes. Here I describe Depicting Lagged Causality (DELAY), a convolutional neural network for the inference of gene-regulatory relationships across pseudotime-ordered single-cell trajectories. I first show that combining supervised deep learning with joint probability matrices of pseudotime-lagged trajectories allows the neural network to overcome important limitations of ordinary Granger causality-based methods, for example, the inability to infer cyclic …

Molecular And Metabolic Regulation Of Gastrointestinal Cancer Metastasis, Norihiro Yamaguchi

Student Theses and Dissertations

Most of the cancer related mortality caused by metastatic disease rather than primary tumor growth. More than 80% of gastrointestinal cancers initially metastasize to the liver first. While the prognosis of early-stage cancers is improving, a significant proportion of patients have metastatic disease at the time of diagnosis leading to poor survival outcomes. I focused on colorectal cancer and pancreatic cancer, the second and third leading causes of cancer related death in the United States, due to the lack of molecularly targeted therapies available for these cancers. Moreover, understanding the pathophysiological basis of gastrointestinal cancer liver metastasis is of great …

A Scent Of Direction: Exploring Adaptive Olfactory Navigation In Drosophila, Chad Morton

Student Theses and Dissertations

Animals rely on environmental cues, such as odors, to navigate through complex and often dynamic landscapes. While olfactory navigation has traditionally been modeled as a reflexive behavior driven by immediate sensory cues, whether flies can leverage more sophisticated strategies, integrating sensory input with spatial memory and internal representations of their surroundings, remains unclear. A key challenge in studying olfactory navigation lies in the invisible and unpredictable nature of odor plumes, which has made it challenging to accurately assess the ongoing sensory experiences of an animal. To address this challenge, we developed a novel virtual reality (VR) system that head-fixed Drosophila …

Occupational Exposures To Chemicals In Dentistry: A Scoping Review, Geneviève Picard, Tisha Prakash, France Labrèche, Sabrina Gravel

Revues de littérature, synthèses de connaissances

The dental workforce comprises a variety of professions, most of which are predominantly occupied by women. Dental workers can be exposed to numerous toxic chemicals such as mercury, methacrylate polymers, and silica. This scoping review aims to synthesize the scientific literature on quantified chemical exposures and to identify research gaps in occupational chemical hazards faced by dental professionals. This review followed the Joanna Briggs Institute approach and PRISMA-ScR guidelines, using three concepts to search PubMed, Embase, and Web of Science: workers, dental care, and chemicals. Studies from high-income countries, published in French or English between 2000 and 2024 and reporting …

The Effect Of Zebra Mussels On Minnesota Fish Communities, Benjamin D. Strei

Journal of Earth and Life Science

Zebra mussels Dreissena polymorpha are an aquatic invasive species that has been spreading quickly throughout Minnesota water bodies since 1989. Zebra mussels are known to change certain morphological conditions in lakes such as turbidity, phytoplankton abundance, and aquatic invertebrate populations. However, studies showing impacts of the infestation of zebra mussels on the health of a fish community have been hard to prove due to a lack of repeated surveys and a suite of other confounding variables such as natural and seasonal variability, plant community, and lake morphometry. Therefore, the objective of this study is to determine whether zebra mussels have …

Cdh-3/Cadherin, Yap-1/Yap And Egl-44/Tead Promote Syx-2/Syntaxin And Eff-1 Fusogen-Mediated Phagosome Closure, Alec Whited, Aladin Elkhalil, Ginger Clark, Piya Ghose

Biology Theses - Archive

Physical interactions between cells, such as cell-cell junctions, can profoundly impact cell fate. A vital cell fate for normal development and homeostasis is programmed cell death. Cells fated to die must be efficiently cleared away via phagocytosis, and defects are associated with a variety of diseased states. Whether cell-cell physical associations affect programmed cell elimination has not been well-explored. Here we describe, in vivo, a cell-cell adhesion-driven signaling pathway that ensures compartment-specific cell clearance during development. We previously described the specialized cell death program “Compartmentalized Cell Elimination” (CCE) in the C. elegans embryo. During CCE, the tail-spike cell (TSC), a …

Impact Of Glufosinate On Soil Microbial Community Dynamics, Sarobi Das

Biology Dissertations - Archive

The increasing global regulations of glyphosate due to its possible carcinogenicity and environmental hazards have necessitated the search for alternative herbicides. Glufosinate-ammonium offers a sustainable attribute due to its low toxicity and limited reported herbicide resistance cases. Despite its increasing agricultural importance, very limited studies are done on its environmental impact, especially on the soil systems. This thesis examines the ecological behavior of glufosinate in soil, precisely focusing on its effect on the dynamics of soil microbiome and the potential use of Bradyrhizobium japonicum USDA110 for bioremediation by reversing the effect of microbial dysbiosis. A series of 30-day mesocosm studies …

How Individual Traits Predict Distribution Patterns And Community Convergence, Zachary K. Lange

Biology Dissertations - Archive

One of the fundamental questions in biology is whether natural conditions lead species and communities toward predictable outcomes. Answering this question requires understanding how traits of individual organisms are connected to species- and community-level patterns. In Chapter 2, I examined how thermal physiology and environmental temperatures interact to determine the distribution patterns of Anolis lizards on the Greater Antilles. I combined lab-measured thermal traits (critical thermal minimum: CT_min, critical thermal maximum: CT_max, thermal preference: T_pref) with occurrence and abundance data from 21 species of Anolis lizards collected from extensive mark-resight surveys of communities across …

Field Trials Report 2024: Wa Farming Systems Project (Daw2204-003rtx), Department Of Primary Industries And Regional Development, Western Australia

Farm Systems and Economics research reports

Within the Western Australian Faming Systems Project, a program of 11 field trials were conducted in 2024 from Ogilvie in the north to Wittenoom Hills in the south.

The season was a challenging one with a late break to the season at all sites and varying conditions from decile 3 to decile 10 growing season rainfall across the sites.

Serum Resistin Levels In Patients With Acne Vulgaris And It's Correlation With Disease Severity, Marwa M. Lasheen, Magdy A. Elsohafy, Gehad M. El Mazny, Manar A. Hassan

Mansoura Medical Journal

Background: Acne is a condition characterized by inflammation of the pilosebaceous unit, and resistin—an inflammatory hormone may contribute to its pathogenesis, as studies show altered serum levels in acne patients. This work aimed to evaluate serum resistin levels in acne vulgaris patients and its association with disease severity. Methods: This Case control study involved 46 individuals had acne vulgaris, ranged in age from 18 to 35, free of systemic medication for the three months or topical treatment for the last month and 46 apparently healthy age and sex matched subjects. The patients were then split into two categories: Cases (n …

Aprepitant Ameliorates Cyclophosphamide-Induced Testicular Toxicity In Mice Via Suppression Of P38 Mitogen-Activated Protein Kinase, Suzan Awad Abdelghany Morsy, Amira H. Eltrawy, Nehal Adel Khalil, Abd Elaziz Mm, Nourhan Mohamed Mohamed Saeed, Gehad M. Khamis

Mansoura Medical Journal

Background: While cyclophosphamide (CP) is a commonly used immunosuppressant and anticancer drug, it has a high risk of testicular toxicity. The current study evaluated the protective and therapeutic actions of aprepitant (APR), a neurokinin-1 receptor blocker, against CP-induced testicular toxicity in mice and the role of oxidative stress and phosphorylated P38 mitogen-activated protein kinase (p-P38 MAPK) in this action.Methods: Forty male mice were assigned to four groups: control (vehicle only), CP-induced testicular toxicity (single 200 mg/kg intraperitoneal CP dose), APRprotected (20 mg/kg/day APR starting one day before CP, continued for 30 days), and APR-treated (same APR dose starting one hour …

Interplay Between Amiodarone And Statins: Experimental Evidence Of Synergistic Hepatotoxicity, Hager Zaki Elghareb, Abdel-Motaal M. Fouda, Mohamed Mahmoud Elhadidi, Ahmed Abdel-Monem Elmetwally

Mansoura Medical Journal

Background: Drug-induced liver injury (DILI) continues to be a main contributor to acute liver failure. So, this study aimed to investigate interactions between amiodarone and atorvastatin concerning hepatic safety, due to increasing clinical practice of their combination for optimal arrhythmia control. Methods: Forty male Sprague Dawley rats were randomly divided into four groups (10 in each group). Group 1 was control group receiving normal saline. Group 2 received Amiodarone-only \ (administered 30 mg/kg/day orally). Group 3 received Atorvastatin only (administered 10 mg/kg/day orally). Group 4 received combination of both amiodarone and atorvastatin in same previous doses. All drugs were dissolved …

Relationship Between Down Syndrome And Attention Deficit Hyperactivity Disorder And The Role Of Fkbp5 Gene: A Review Of Current Evidence, Israa A. Elsawi, Dina Salama Abd-Elmagid, Doaa Shahin, Mohamed Rizk Khodair, Sohier Yahia

Mansoura Medical Journal

The most prevalent chromosomal disorder is Down syndrome (DS). Neurodevelopmental disorders are highly associated with Down syndrome, such as attention deficit hyperactivity disorder (ADHD). Down syndrome is also distinguished by intellectual disability and developmental delays, with many affected individuals presenting manifestations of ADHD like inattention or hyperactivity. Differentiating ADHD from overlapping DS-related cognitive deficits remains a diagnostic dilemma. The FKBP5 gene, particularly the rs7748266 polymorphism, has been implicated in modulating stress response pathways linked to ADHD susceptibility. This review summarizes the relationship between DS and ADHD and explores the emerging role of FKBP5 rs7748266 in this context. This may later …

Inactivation Of Zika Virus With Hydroxypropyl-Beta-Cyclodextrin, Cory R. Hewitt, Nicholas J. Wixon, Arthur Gallegos, You Zhou, Victor C. Huber, M. Scott. Killian

Nebraska Center for Biotechnology: Faculty and Staff Publications

Background/Objectives: Zika virus (ZIKV) infection is associated with life-threatening diseases in humans. To date, there are no available FDA-approved therapies or vaccines for the specific treatment or prevention of ZIKV infection. Variation in the ZIKV envelope protein (Env), along with its complex quaternary structure, presents challenges to synthetic approaches for developing an effective vaccine and broadly neutralizing antibodies (bnAbs). We hypothesized that beta-cyclodextrin (BCD) could be used to uniquely inactivate infectious ZIKV without disruption of Env.

Methods: ZIKV was propagated in Vero cells and admixed with BCD. The BCD-treated ZIKV was evaluated for infectivity using immunofluorescence and quantitative …