Life Sciences Commons^™

The Reveal: A Technical Study And Conservation Treatment Of An Overpaint Portrait, Camille Ferrer

Art Conservation Master's Projects

A severely damaged 19th-century oil painting depicting a portrait of a woman was treated at Patricia H. and E. Garman Art Conservation Department. A typed letter provided by the owner mentioned that it has been previously restored yet returned with unsatisfactory results. After further examination, the painting appeared to have been previously treated multiple times by different people. There was overpaint distinctly present on the face and later discovered to be present overall. The full state of condition of the painting was initially unknown due to the sum of the surface being overpainted. However, there were evidence of paint loss …

Optimization Of Tyrosine Hydroxylase Antibody For Immunohistochemistry Fluorescence Detection In Zebrafish (Danio Rerio), Madison Thurber

Theses/Capstones/Creative Projects

Dopamine is an important neurotransmitter produced through the catecholamine synthesis pathway that affects brain activity. Unregulated dopamine levels can lead to various diseases such as Parkinson’s Disease or attention deficit hyperactivity disorder (ADHD). Optimization of an immunohistochemistry protocol will allow for the quantification of tyrosine hydroxylase antibody, which indirectly allows for dopamine quantification in dopaminergic regions within the brain. However, the antibody concentration to give the optimal signal-to-noise ratio in IHC varies across studies. Through this experiment, I determined the concentration of tyrosine hydroxylase (TyrH) antibody for immunohistochemistry that gave the best signal-to-background noise ratio within several known dopaminergic regions …

The Future Of The Organization Of The Petroleum Exporting Countries, Mikayla Gross

Honors Theses, University of Nebraska-Lincoln

The Organization of the Petroleum Exporting Countries (OPEC) is a multinational and intergovernmental organization that dictates the petroleum exportation policies of 13 countries: Algeria, Angola, Equatorial Guinea, Gabon, Iran, Iraq, Kuwait, Libya, Nigeria, the Republic of the Congo, Saudi Arabia, the United Arab Emirates and Venezuela (About Us, 2023). The mission of OPEC is to ensure a stable supply of petroleum through its shared policies for its Member Countries and consumers (Our Mission, 2023). Iran, Iraq, Kuwait, Saudi Arabia, and Venezuela founded OPEC in 1960 under the foundations and principles that dictated the international world order. Those foundations and principles …

Machine Learning-Based Soybean Yield Prediction And Optimizing Lidar-Mounted Uav Efficiency, Leticia Santos

LSU Master's Theses

The first chapter of this thesis explores the predictive capabilities of random forests algorithm on datasets obtained from field plot experiments on crop management systems in soybean. Furthermore, the chapter presents a complementary analysis of model performance according to dataset sizes and two techniques on how to impute and deal with missing data. Random forests are being compared with standard statistical techniques such as linear regression on a well-structured, information-rich agronomic experiment. The key findings of this chapter includes the best hyperparameters adjustment and the identification of the dataset threshold for optimal algorithms performance. The second chapter has a research …

Synthesis And Biophysical Analysis Of Modified Cell-Penetrating Peptides, Joel Mitchell

Theses and Dissertations (Comprehensive)

Cell-penetrating peptides (CPPs) are a family of peptides that have the ability to penetrate biological membranes. They were discovered in the late 1980s and have been the topic of many studies. Much of the interest in CPPs has been due to their ability to translocate biological membranes, and the possibility that they could offer a novel drug delivery method by conjugation to biologically active molecules. Linear CPPs can be modified to form cyclic structures. This change in structure has been observed to enhance the stability and penetrative ability of the CPPs which have been studied. The current thesis focuses on …

Assessing Lipid Composition Of Cell Membrane In Escherichia Coli Under Aerobic And Anaerobic Conditions, Isabelle Johnson

Undergraduate Theses, Professional Papers, and Capstone Artifacts

Escherichia coli is a highly studied model organism that is tightly tied to the mammalian gastrointestinal system. This microorganism has the capability to be a beneficial gut microbe or a life-threatening pathogen. In this study, the lipid membrane of Escherichia coli was investigated using Matrix-Assisted Laser Desorption/Ionization-Time of Flight Mass Spectrometry (MALDI-TOF MS) to observe the change in its composition in aerobic and anaerobic conditions. Evidence of desaturation was discovered in the spectra, though more investigation is needed to understand the metabolic processes and drives that result in this change. Elucidation of these pathways in the future could result in …

Zebrafish Electroretinogram Responses, Brooke Campbell

Williams Honors College, Honors Research Projects

The goal of this project is to be able to streamline a protocol for conducting ERGs on zebrafish from mice ERG protocol already present in Dr. Renna’s lab. The objective is to create a protocol specifically for zebrafish and to eliminate any issues that occur when transiting from a mice ERG protocol to a zebrafish ERG protocol and to obtain a light response from zebrafish retinae in differing light intensities. Dr. Renna’s lab has designed an Ex Vivo ERG system with less electrical interference creating defined electrical responses from mouse retina. The setup allows for continual perfusion of the retinal …

Single Night Surveys Of Moth Communities Can Serve As Ultra-Rapid Biodiversity Assessments, Daniel P. Duran, Matthew Timar, Blaine Rothauser

School of Earth & Environment Faculty Scholarship

Biodiversity conservation decisions are typically based on limited data and resources. For this reason, there is great interest in surveying taxa that may allow for a rapid assessment of the biodiversity at a site. Numerous taxa have been proposed and utilized for rapid assessments that allow for such a survey in a matter of weeks or less. Herein, we test the idea that nocturnal moths have many of the characteristics that make them ideal for such surveys, such as relative ease of identification, strong ecological association with specific plant species and habitats, high alpha diversity, extended seasonal activity, and ease …

First Draft Genome Of Thecaphora Frezii, Causal Agent Of Peanut Smut Disease, Renee S. Arias, Cinthia Conforto, Valerie A. Orner, Edgardo J. Carloni, Juan H. Soave, Alicia N. Massa, Marshall C. Lamb, Nelson Bernardi-Lima, Alejandro M. Rago

Publications from USDA-ARS / UNL Faculty

Objectives: The fungal pathogen Thecaphora frezii Carranza & Lindquist causes peanut smut, a severe disease currently endemic in Argentina. To study the ecology of T. frezii and to understand the mechanisms of smut resistance in peanut plants, it is crucial to know the genetics of this pathogen. The objective of this work was to isolate the pathogen and generate the first draft genome of T. frezii that will be the basis for analyzing its potential genetic diversity and its interaction with peanut cultivars. Our research group is working to identify peanut germplasm with smut resistance and to understand the genetics …

Enhancing Efficiency Of The Nutrition Education For Utah Refugees, Habiba Ali Nur

All Graduate Theses and Dissertations, Fall 2023 to Present

Refugees face many challenges related to obtaining and preparing adequate and culturally acceptable and desirable foods in their resettlement communities. These challenges often lead to risk of food insecurity and chronic diseases. A review of literature identified the existing delivery strategies and highlighted the need for nutrition education tailored to the refugees’ conditions. This study identified some of the barriers that refugees face, including the English language, transportation, finding items in grocery stores, availability of ingredients and equipment needed for cooking, affordability of food and budgeting. It also highlighted participants’ preference for having nutrition education.

To overcome these challenges, the …

Understanding The Impact Of Physicochemical Modifications On The Cold Gelling Behavior Of Micellar Casein Concentrate Dispersions, Nathan Pougher

All Graduate Theses and Dissertations, Fall 2023 to Present

When skim milk is filtered via microfiltration, the amount of casein (one of the major milk proteins) in solution can be concentrated. When casein content is high enough (>15%), the solution forms a gel at cold temperatures. With growing trends in the food industry towards simplistic ingredient labels, commonly used gums and stabilizers in the dairy industry are becoming less preferred. In the future, there is potential for the gelling properties of micellar casein to be applied to dairy products as a thickener or stabilizer, but the mechanism behind gel formation isn’t understood well. In this study, the gel …

Accelerated Evolution Of Sars-Cov-2 In Free-Ranging White-Tailed Deer, Dillon S. Mcbride, Sofya K. Garushyants, John Franks, Andrew F. Magee, Steven H. Overend, Devra Huey, Amanda M. Williams, Seth A. Faith, Ahmed Kandeil, Sanja Trifkovic, Lance Miller, Trushar Jeevan, Anami Patel, Jacqueline M. Nolting, Michael J. Tonkovich, J. Tyler Genders, Andrew J. Montoney, Kevin Kasnyik, Timothy J. Linder, Sarah N. Bevins, Julianna B. Lenoch, Jeffrey C. Chandler, Thomas J. Deliberto, Eugene V. Koonin, Marc A. Suchard, Philippe Lemey, Richard J. Webby, Martha I. Nelson, Andrew S. Bowman

USDA Wildlife Services - Staff Publications

The zoonotic origin of the COVID-19 pandemic virus highlights the need to fill the vast gaps in our knowledge of SARS-CoV-2 ecology and evolution in non-human hosts. Here, we detected that SARS-CoV-2 was introduced from humans into white-tailed deer more than 30 times in Ohio, USA during November 2021-March 2022. Subsequently, deer-to-deer transmission persisted for 2–8 months, disseminating across hundreds of kilometers. Newly developed Bayesian phylogenetic methods quantified how SARS-CoV-2 evolution is not only three-times faster in white-tailed deer compared to the rate observed in humans but also driven by different mutational biases and selection pressures. The long-term effect of …

The Effects Of Agroecological Farming Systems On Human Health, Olivia Kathryn Mason

All Graduate Theses and Dissertations, Fall 2023 to Present

There is a growing concern that the current farming techniques are producing less-nutrient dense soils and foods impacting human health. To improve the health of soils, people, and the plant, a growing number of farmers are using regenerative, or agroecological, farming practices. Some of these methods include multi-cropping (growing various plants on the same plot of land), ley systems (alternating between crops and livestock), and rotational grazing of livestock. Previous studies have found that regenerative farming systems have various benefits for the lands, crops, and animals, as well as increasing the nutrient density of foods.

The purpose of this study …

Linking Microbial Community Assembly In Flowers With Function Under Diverse Environmental Conditions: A Case Study Involving Erwinia Amylovora, Christopher Skylar Mcdaniel

All Graduate Theses and Dissertations, Fall 2023 to Present

Fire blight, a devastating disease of pome fruit trees caused by the bacterium Erwinia amylovora, can cause millions of dollars in losses for producers each year around the globe. Management approaches that involve use of antibiotics, such as streptomycin, can be effective; although concerns exist over pollinator and crop health when using them regularly. Recently, there have been developments that allow for biological agents such as microbes to curtail fire blight infection. These agents work by competing with Erwinia for resources or space, producing antibacterial compounds, or even killing Erwinia cells on contact. Unfortunately, these agents do not yet …

Characterization Of Enterovirus D68 In A Mouse Model And Evaluation Of Antiviral Therapies, Zoe K. Taylor

All Graduate Theses and Dissertations, Fall 2023 to Present

Enterovirus D68 (EV-D68) is a virus that causes respiratory disease. Children are most commonly affected by EV-D68 but immunocompromised adults can also get infected and develop severe disease signs. In 2014, the United States experienced an unprecedented outbreak of EV-D68. Similar outbreaks were also observed in 2016, 2018 and 2022. Interestingly, few EV-D68 infections were observed in 2020, likely due to public health measures put in place to reduce the spread of another respiratory disease, coronavirus disease 2019 (COVID-19). EV-D68 is in the same virus family as polio, and one of the most concerning findings from these outbreaks is that …

Geographic Variation In Blue Orchard Bee (Osmia Lignaria) Development And Performance As A Managed Pollinator In The Western United States, Morgan B. Scalici

All Graduate Theses and Dissertations, Fall 2023 to Present

Most flowering plants, including many cultivated food crops, will only produce well-developed fruits and seeds if pollen is transferred from one flower to another with the help of an animal pollinator. Honey bees are the most well-known and ubiquitous but are poor pollinators of some commercially important crops, or are in poor supply during crop bloom. In such cases, farmers will employ other managed pollinators such as bumble bees or solitary bees like mason and leafcutting bees. The blue orchard bee is North America's most agriculturally important native mason bee as effective pollinators of spring-blooming fruit crops. Differences in developmental …

Synthesis Of Bacterial Glycerophospholipids For Biomembrane Model Studies: A Means To Advanced Biofuels, Felix Adulley

Electronic Theses and Dissertations

To reduce reliance on fossil fuels, sustainable biofuels are being pursued, especially advanced biofuels like 1-butanol that have higher energy content and greater compatibility with existing infrastructure than ethanol. A persistent challenge is the yield-limiting toxicity of biofuels and process solvents, such as tetrahydrofuran, to the microbes that ferment biomass into biofuel. The cell membrane is a focal point of toxicity, and understanding how it interacts with fuels and solvents is key to improving yield. Phospholipid bilayers are the core of biomembranes, and model biomembranes of defined composition provide the ideal platform for biophysical studies. To this end, glycerophospholipids characteristic …

Fabrication Of Novel Electropolymerized Conductive Polymer Of Hydrophobic Perfluorinated Aniline As Transducer Layer On Glassy Carbon Electrode: Application To Midazolam As A Model Drug Of Benzodiazepines, Ekram Hany Mohamed, Amr Mahmoud,, , Nancy Nashat, Sally El-Mosallamy

Pharmacy

The objective of this study is to fabricate solid-contact ion selective electrodes (SC-ISEs) that have long term stable potential. Various conducting polymers such as polyaniline and its derivatives have been successfully employed to improve the potential stability in SC-ISEs. Recently, the role of hydrophobicity at the interface between the conducting polymer solid contact and the ion sensing membrane has been investigated and figured out that the hydrophobic interfaces preclude water layer formation that deteriorate the SC-ISEs potential stability and reproducibility. In this work, a hydrophobic polyaniline derivative was fabricated on the surface of a glassy carbon electrode by electropolymerization of …

Forages And Technology Management In Growing And Finishing Beef Cattle Systems, Kelton Adair

Theses and Dissertations in Animal Science

A systems study evaluated the effects of an implant [25.7 mg estradiol (Compudose; Elanco Animal Health)] at two rates of gain (LOW: 0.45 kg/d and HIGH: 0.9 kg/d) applied during the winter backgrounding phase in drylot and winter grazing systems and its effects on subsequent phases of production. HIGH supplementation with an implant during the winter backgrounding phase in the drylot system yielded the greatest ending body weight (EBW) during the summer backgrounding phase (P = 0.04). LOW supplementation, without an implant, improved summer backgrounding average daily gain (ADG; P = 0.05) while achieving similar carcass adjusted final body …

Gut Microbial Communities Of Hybridising Pygmy Angelfishes Reflect Species Boundaries, Megan J. Huggett, Jean-Paul A. Hobbs, Federico Vitelli, Michael Stat, Tane H. Sinclair-Taylor, Michael Bunce, Joseph D. Dibattista

Research outputs 2022 to 2026

Hybridisation and introgression of eukaryotic genomes can generate new species or subsume existing ones, with direct and indirect consequences for biodiversity. An understudied component of these evolutionary forces is their potentially rapid effect on host gut microbiomes, and whether these pliable microcosms may serve as early biological indicators of speciation. We address this hypothesis in a field study of angelfishes (genus Centropyge), which have one of the highest prevalence of hybridisation within coral reef fish. In our study region of the Eastern Indian Ocean, the parent fish species and their hybrids cohabit and display no differences in their diet, behaviour, …