Digital Commons Network^™

The Impact Of Mentoring On Life Science Undergraduate Mentors, Kari Nelson

Department of Teaching, Learning, and Teacher Education: Theses and Other Student Research

Universities are increasingly encouraging their undergraduates to become mentors to others, yet relatively little research has been done to empirically understand the impact of this work on the mentors themselves. Therefore, the overall goals of this work were: (1) To evaluate the types of studies that have been conducted on the impacts of serving as an undergraduate mentor; (2) To examine the methodological rigor of recent studies and make recommendations for improvement; and (3) To asses if serving as an undergraduate mentor impacted the critical thinking of the mentors, using a valid and reliable instrument, the California Critical Thinking Skills …

Nebline, May 2018

NEBLINE Newsletter Archive from Nebraska Extension in Lancaster County

Feature: Farmers: Use climate for planning, weather for doing

Farm & Acreage

Pests & Wildlife

Horticulture

Early Childhood

4-H & Youth

and other extension news and events

Influence Of Multispecies Interference Of Common Ragweed (Ambrosia Artemisiifolia L.) And Common Waterhemp (Amaranthus Rudis Sauer) On Soybean [Glycine Max (L.) Merr.] Growth And Yield Under Variable Water Supply In Nebraska, Koffi Badou Jeremie Kouame

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

Common ragweed (Ambrosia artemisiifolia L.) and common waterhemp (Amaranthus rudis Sauer) are two problematic weeds for soybean producers in the United States. Both weeds have evolved resistance to many herbicides, including glyphosate. It is therefore essential to understand how these weeds in mixture impact soybean growth and yield and also how they deplete soil moisture in rainfed and irrigated cropping systems. The objectives of this research were to: (i) understand the influence of variable water supply on soybean yield loss in mixture with ragweed and waterhemp, (ii) quantify the influence of variable water supply on soybean growth in …

Effect Of Gallic And Ferulic Acids On Oxidative Phosphorylation On Candida Albicans (A72 And Sc5314) During The Yeast-To-Hyphae Transition, Rehab Aldahash

Department of Food Science and Technology: Dissertations, Theses, and Student Research

Candida albicans is a dormant commensal in the mucosa of healthy individuals but can become an opportunistic pathogen when the host microflora is compromised. It has been reported as the most common cause of fungal infection among hospitalized U.S. patients, with elevated mortality rate. Candida species have been reported as resistant to antifungal drugs that increase the application of novel strategies to treat this infection. Among the natural compounds that have most gained attention as potential agents against fungi are phenolic compounds against fungi. C. albicans has the ability to switch phenotype from yeast-to-hyphae cells, with hyphae being the most …

Examining Generativity Development Among College Student Leaders Who Mentor, Hannah M. Sunderman

Department of Agricultural Leadership, Education, and Communication: Dissertations, Theses, and Student Research

The purpose of this cross-sectional study was to examine the influence, if any, of age cohort on generativity among college student leaders who mentor. While previous research has revealed that college student leaders who mentor tend to demonstrate higher levels of generativity than other college student leaders and general college students (Hastings, Griesen, Hoover, Creswell, & Dlugosh, 2015), research as to the development of generativity among college student leaders who mentor has not been determined. Additionally, a need exists for further research on the antecedents of generativity (McAdams, 2001, p. 434). The current study sought to fill these gaps in …

Parental Involvement Among Low-Income Filipinos: A Phenomenological Inquiry, Aileen S. Garcia

College of Education and Human Sciences: Dissertations, Theses, and Student Research

Parental involvement in children’s education is an integral component of young children’s academic achievement. In the Philippines, a developing country with high rates of poverty and input deficit in basic education, school dropout rates are high especially among the poor. Given that many children from disadvantaged backgrounds do not get enough support (PIDS, 2012) and many parents are not equipped with skills to support their children’s education, it is essential to investigate how Filipino parents can help and contribute to their children’s academic success. In response to the lack of parental involvement literature situated in the Philippine context, the present …

Transmission Characteristics Of Triticum Mosaic Virus By The Wheat Curl Mite Aceria Tosichella Keifer And Ecology Of The Wheat–Mite–Virus Complex On Field Corn, Elliot Andrew Knoell

Department of Entomology: Dissertations, Theses, and Student Research

The wheat curl mite (WCM), Aceria tosichella Keifer, is an economically important pest of winter wheat (Triticum aestivum L.) in the Great Plains of North America due to its ability to transmit three viruses: Wheat streak mosaic virus (WSMV), Triticum mosaic virus (TriMV), and High Plains wheat mosaic virus (HPWMoV). WCM is the only known vector of these plant viruses, making up the wheat-mite-virus complex.

TriMV was recently discovered in 2006, but the transmission characteristics are largely unknown. A study was designed to characterize TriMV acquisition and retention periods for the WCM. For TriMV acquisition, nymphs were placed on …

Nebraska Wetland Condition Assessment: Intensification Of The National Wetland Condition Assessment Throughout Nebraska, Cody Dreier

School of Natural Resources: Dissertations, Theses, and Student Research

Even though wetlands provide a habitat for many plants and animals and numerous services for humans, they were not always treated as areas of value. Less than half of the United States’ pre-colonial wetlands have survived to the present day. Seeing a need to understand the remaining wetlands more fully, the Environmental Protection Agency developed the National Wetland Condition Assessment to monitor target wetlands throughout the country every five years.

This study is an intensification of the National Wetland Condition Assessment for Nebraska wetlands that allowed us to sample more areas of the state and gather additional information. During the …

Investigating Mechanisms Of Hydraulic Conductivity Transience In Sandy Streambeds, Wilhelm Fraundorfer

School of Natural Resources: Dissertations, Theses, and Student Research

Streambed hydraulic conductivity (K) is known to be spatially and temporally heterogeneous, but few attempts to understand the controls on temporal variability have been made. This study documents temporal K transience and demonstrates how hydraulic, geophysical, and sedimentological methods can be combined to understand the processes that give rise to changes in streambed K. Falling head permeameter tests and slug tests were conducted to determine vertical K (K_v) and K (slug test K), respectively. These tests were repeated three times over a twelve-week period on the same grid at a depth of 0.5 …

Aging And Biases In Spatial Memory: A Dynamic Field Approach, Gregory J. Degirolamo

Department of Psychology: Dissertations, Theses, and Student Research

Spatial cognition encompasses a wide variety of abilities and requires the interaction of several regions of the brain, including the hippocampus, striatum, and pre-frontal cortex (PFC). (Packard & McGaugh, 1996; Reuter-Lorenz et al., 2000). Given that these areas atrophy in later adulthood (Golomb et al., 1993; Raz et al., 2003; Aizenstein et al., 2006), it raises the question of how spatial cognition changes with age. It has been found that increased task complexity leads to an age-related decline in performance (Nagel et al., 2009). Other factors that lead to a decline in memory performance in older adults include whether the …

Ptsd And Dysfunctional Parenting: Emotional And Biological Mechanisms, Molly Franz

Department of Psychology: Dissertations, Theses, and Student Research

Women are disproportionately at risk for developing PTSD following exposure to trauma. Among its many harmful effects, PTSD is associated with a range of negative family outcomes, including impairments in parenting behaviors. Despite the prevalence of PTSD and its impact on parenting, little is known about the mechanisms responsible for this association. The present project addressed this gap by examining the impact of PTSD on dysfunctional parenting behaviors in a lab setting. Based on prior theory and empirical evidence, I expected that a diagnosis of PTSD would be associated with more dysfunctional parenting (i.e., harsh/overreactive and lax/permissive behaviors) during routine …

The Wounded Warrior: Resilience Factors Minimizing Suicide Risk In Veterans With Posttraumatic Stress Disorder, Christina Hein

Department of Psychology: Dissertations, Theses, and Student Research

Veterans experience high rates of both posttraumatic stress disorder (PTSD) and suicidal behaviors when compared to the general public. Moreover, PTSD is a significant predictor of suicidal behavior among clinical and non-clinical adult populations. Joiner’s Interpersonal-Psychological Theory (IPT) of suicide (Joiner et al., 2005) identifies three etiological factors that greatly increase risk of suicide, with PTSD potentially increasing risk of suicide by exacerbating these three components of IPT. Conversely, prior work has also identified resilience factors that may serve to buffer against the risk of suicide, particularly by counteracting the three components of IPT. These resilience factors fall into primary …

Ultrafast Affinity Extraction And High-Performance Affinity Chromatography Applications For Measuring Free Drug Fractions: Interactions Of Sulfonylurea Drugs With Normal And Glycated Human Serum Albumin, Bao Yang

Department of Chemistry: Dissertations, Theses, and Student Research

Ultrafast affinity extraction was used with microcolumns containing human serum albumin (HSA) to measure the free fractions of several sulfonylurea drugs in the presence of solution-phase HSA and for the analysis of these drugs at therapeutic levels or determining their binding strengths with this protein. This approach was first used with normal HSA and the drugs glibenclamide, glipizide and glimepiride. This work used both one- and two-dimensional affinity systems based on HSA microcolumns. The first microcolumn was used to extract the free drug fractions in injected drug/protein mixtures. As the retained drug eluted from the first microcolumn, it was passed …

Gulls, Martin S. Lowney, Scott F. Beckerman, Scott C. Barras, Thomas W. Seamans

Wildlife Damage Management Technical Series

Abundant gull (Figure 1) populations in North America have led to a variety of conflicts with people. Gulls cause damage at aquaculture facilities and other properties, and often collide with aircraft. Their use of structures on and near water results in excessive amounts of bird droppings on boats and docks. Their presence near outdoor dining establishments, swimming beaches, and recreational sites can lead to negative interactions with people. Large amounts of gull fecal material pollutes water and beaches resulting in drinking water contamination and swim bans. A combination of dispersal techniques, exclusion and limited lethal control may reduce damage to …

Consensus Ensemble Approaches Improve De Novo Transcriptome Assemblies, Adam Voshall

School of Computing: Dissertations, Theses, and Student Research

Accurate and comprehensive transcriptome assemblies lay the foundation for a range of analyses, such as differential gene expression analysis, metabolic pathway reconstruction, novel gene discovery, or metabolic flux analysis. With the arrival of next-generation sequencing technologies it has become possible to acquire the whole transcriptome data rapidly even from non-model organisms. However, the problem of accurately assembling the transcriptome for any given sample remains extremely challenging, especially in species with a high prevalence of recent gene or genome duplications, those with alternative splicing of transcripts, or those whose genomes are not well studied. This thesis provides a detailed overview of …

Application Of Cosine Similarity In Bioinformatics, Srikanth Maturu

School of Computing: Dissertations, Theses, and Student Research

Finding similar sequences to an input query sequence (DNA or proteins) from a sequence data set is an important problem in bioinformatics. It provides researchers an intuition of what could be related or how the search space can be reduced for further tasks. An exact brute-force nearest-neighbor algorithm used for this task has complexity O(m * n) where n is the database size and m is the query size. Such an algorithm faces time-complexity issues as the database and query sizes increase. Furthermore, the use of alignment-based similarity measures such as minimum edit distance adds an additional complexity to the …

Disentangling The Roles Of Modernization And Secularization On Fertility: The Case Of Turkey, Dogan Hatun

Department of Sociology: Dissertations, Theses, and Student Research

Second Demographic Transition (SDT) theory argues very low fertility results from the simultaneous processes of modernization and secularization. However, this theory has primarily only been examined in the Christian countries of Northern and Western Europe. The assumption that modernization and secularization are co-occurring processes may not apply in other non-European, non-Christian contexts. Notably absent are studies of Muslim-majority nations, where modernization has occurred separate from secularization because the primary interpretation of Islam views the pursuit of secular knowledge is as important as the pursuit of religious knowledge. Therefore, there is a critical need to examine the applicability of the SDT …

Language Use By Spanish Heritage Speakers In The Classroom And The World And The Implications For Educators, Amanda Deras

Honors Program: Senior Projects (Public)

Looking at the patterns of language use, language attitudes, and language ideologies, this literature review investigates how Spanish heritage speakers’ use of Spanish and their views on using Spanish translate into the classroom. This paper looks at Spanish heritage language use in both official and unofficial spaces, putting emphasis on use in the classroom. Additionally, it looks at the language attitudes and ideologies Spanish heritage language speakers have toward the use of Spanish, English, and “Spanglish” in different contexts. Heritage language speakers, particularly Spanish heritage language speakers, are growing in number in the United States and in American schools. In …

Replacing Herbicides With Groundcovers To Enhance Vineyard Sustainability, Benjamin A. Loseke

Department of Agronomy and Horticulture: Dissertations, Theses, and Student Research

In many Midwestern vineyards a three to four-foot weed-free strip is maintained directly beneath the vines to reduce vine-weed competition. Conventionally, this strip has been conserved with repeated applications of herbicide, mainly glyphosate. The necessity for this weed-free strip to reduce vine-weed competition has been well documented in more arid climates. However, in areas with higher soil fertility and adequate rainfall, this strip may be unnecessary. Moreover, stand establishment and early vine growth have not been well documented when planting groundcovers (GC) immediately following the vine planting. The main objective of this project is to assess the severity of competition …

Reading Charlotte Brontë Reading, Madhumita Gupta

Department of English: Dissertations, Theses, and Student Research

This essay considers the significance of undirected childhood reading on an author’s mind and the reason some authors reference specific real books in their fiction. I argue that independent reading (as against schooling or formal education), and the direct and indirect references to certain books in Jane Eyre^[1] were deliberate, well-thought-out inclusions for specific purposes at different points in the story. When a title pointedly says Jane Eyre: An Autobiography, it is probable that a significant part of the author’s life has seeped into her creation which makes it essential to consider the relevant parts of her life to …

Critical-Point Model Dielectric Function Analysis Of Wo3 Thin Films Deposited By Atomic Layer Deposition Techniques, Ufuk Kılıç, Derek Sekora, Alyssa Mock, Rafał Korlacki, Elena M. Echeverría, Natale J. Ianno, Eva Schubert, Mathias Schubert

Department of Electrical and Computer Engineering: Faculty Publications

WO₃ thin films were grown by atomic layer deposition and spectroscopic ellipsometry data gathered in the photon energy range of 0.72-8.5 eV and from multiple samples was utilized to determine the frequency dependent complex-valued isotropic dielectric function for WO₃. We employ a critical-point model dielectric function analysis and determine a parameterized set of oscillators and compare the observed critical-point contributions with the vertical transition energy distribution found within the band structure of WO₃ calculated by density functional theory. We investigate surface roughness with atomic force microscopy and compare to ellipsometric determined effective roughness layer thickness.

Hartmann Characterization Of The Peem-3 Aberration-Corrected X-Ray Photoemission Electron Microscope, A. Scholl, M. A. Marcus, A. Doran, J. R. Nasiatka, A. T. Young, A. A. Macdowell, R. Streubel, N. Kent, J. Feng, W. Wan, H. A. Padmore

Robert Streubel Papers

Aberration correction by an electron mirror dramatically improves the spatial resolution and transmission of photoemission electron microscopes. We will review the performance of the recently installed aberration corrector of the X-ray Photoemission Electron Microscope PEEM-3 and show a large improvement in the efficiency of the electron optics. Hartmann testing is introduced as a quantitative method to measure the geometrical aberrations of a cathode lens electron microscope. We find that aberration correction leads to an order of magnitude reduction of the spherical aberrations, suggesting that a spatial resolution of below 100 nm is possible at 100% transmission of the optics when …

Concepts In Animal Parasitology: Permission To Publish Agreement, University Of Nebraska-Lincoln Libraries

Concepts in Animal Parasitology

Blank Permission to Publish agreement form for authors of the Concepts in Animal Parasitology textbook/open educational resource.

Condition-Dependent Life History Strategies, Shivani Vijayraj Jadeja

School of Biological Sciences: Dissertations, Theses, and Student Research

Many organisms evolve condition-dependent life history strategies to maximize their lifetime fitness in response to intrinsic and extrinsic processes. I investigated a sequentially flowering plant’s strategy to allocate resources to retain flowers versus grow existing basal fruits to a larger size, using the plant Yucca glauca. The sink strength hypothesis suggests basal fruits are nutrient sinks depriving distal flowers of resources and reducing their probability of retention. A low probability of retention of distal flowers can also be explained by the architectural effects hypothesis. This hypothesis posits inherent positional differences in structures along an inflorescence such as flower size …

Arsenic Toxicity And Mitochondrial Metabolism In Astrocytes, Reilly Grealish

Honors Program: Senior Projects (Public)

The various cells that support neurons in both the central and peripheral nervous systems are known collectively as neuroglia, or glia. Astrocytes, a type of glial cell found exclusively in the central nervous system (i.e. the brain and spinal cord), are particularly abundant and serve many functions. One of the most important is the role these cells play in the brain as a defense against harmful substances, many of which can be found in the environment and make their way into the human body as xenobiotic substances. Elemental arsenic in its inorganic form occurs naturally throughout the Earth’s crust, but …

Peridynamic Modeling Of Dynamic Fracture In Bio-Inspired Structures For High Velocity Impacts, Sneha Akula

Department of Mechanical and Materials Engineering: Dissertations, Theses, and Student Research

Bio-inspired damage resistant models have distinct patterns like brick-mortar, Voronoi, helicoidal etc., which show exceptional damage mitigation against high-velocity impacts. These unique patterns increase damage resistance (in some cases up to 3000 times more than the constituent materials) by effectively dispersing the stress waves produced by the impact. Ability to mimic these structures on a larger scale can be ground-breaking and could be used in numerous applications. Advancements in 3D printing have now made possible fabrication of these patterns with ease and at a low cost. Research on dynamic fracture in bio-inspired structures is very limited but it is …