Digital Commons Network^™

Indirect Impact Of Soil Microbial Communities On Plant-Aphid Interactions, Zachary Tiemann

Master's Theses

The community dynamics of soil micro-environments are influenced by root, fungal, and bacterial exudates that can preferentially select for functional classes of microbes. Arbuscular mycorrhizal fungi (AM) fungi and plant growth promoting rhizobacteria (PGPR) are members of this community form symbiotic relationships with plants and play an important role in triggering induced systemic resistance (ISR), resulting in defensive “priming.’ Consequently, ‘primed’ plants can activate stronger and faster defense responses to future attacks by pathogens and insects. The biological system in this study involved four genotypes of barrel medic plants (Medicago truncatula), pea aphids (Acyrthosiphon pisum), and microbial communities present in …

Characterizing Of Monoamine Neurotransmitters At The Hub Of The Central Auditory System, Patrick Wilson

Master's Theses

In the United States, loss of hearing impacts approximately 48.1 million people. The cumulative effects of noise are experienced in every area of society whether occupational, environmental, or through aging. A number of studies have linked noise induced hearing disorders to changes in spontaneous neuronal activity in certain auditory brain regions, especially, the inferior colliculus, a region that integrates auditory inputs from both ascending and descending pathways. However, the exact neurochemical basis of these disorders remains elusive. Currently, there are several compelling pieces of evidence that implicate the monoamine neurotransmitter, dopamine, in auditory processing. Based on this data, we have …

Investigating The Role Of Atp-Binding Cassette Transporters In Drosophila Melanogaster Testis Stem Cells, Israel J. Wipf

Master's Theses

Multidrug resistance is among the most pressing obstacles in cancer treatment today. Resistance is thought to arise from the ability of cancer stem cells to efflux therapeutic molecules using a collection of membrane proteins called ATP-binding cassette (ABC) transporters. There is strong interest in targeting ABC transporters to preserve and improve drug efficacy and reduce cancer recurrence. Many studies have been performed in vitro using cultured cell lines, but currently there is a lack of simple models in which to study ABC transporters in vivo. As a solution, I propose to use the fruit fly Drosophila melanogaster for the study …

Resistance To Rattlesnake Venoms In An Eastern Colorado Rodent Community, Neil Balchan

Master's Theses

The grasslands of eastern Colorado are inhabited by two species of rattlesnakes, the Prairie Rattlesnake (Crotalus viridis) and the Desert Massasauga Rattlesnake (Sistrurus tergeminus edwardsii). An array of rodent species, both native and introduced, also occupy these grasslands, and serve as a varied prey base for the previously listed rattlesnakes. Predator-prey interactions in this system gain an additional level of complexity due to the presence of venoms, a chemical arsenal possessed by both rattlesnakes to incapacitate their prey. Rodents in other systems have demonstrated resistance to snake venoms, and there is potential for a similar dynamic to be present in …

Cannabigerol Attenuate Methionine/Choline Deficient Diet- Induced Non-Alcoholic Steatohepatitis Symptoms In C57bl/6 Male Mice Via Modulating The Expression Of Cannabinoid Receptors, Nouf Aljobaily

Master's Theses

Non-Alcoholic Steatohepatitis (NASH) is the advanced and more aggressive form of Non-Alcoholic Fatty Liver Disease (NAFLD). NASH is associated with severe hepatic fibrosis and inflammation. Methionine/choline deficient (MCD) high fat diet is known to induce NASH in a short period of time without showing signs of metabolic syndrome. Cannabigerol (CBG) is a plant-derived, non-psychotropic cannabinoid that has a potential anti-inflammatory effect. Other hemp extracts reduce the progression of NAFLD to NASH, whereas the impact of CBG on NASH is still unknown. Therefore, these studies aim to 1. Evaluate the therapeutic potential of CBG on reducing hepatic steatosis and fibrosis. 2. …

The Effects Of Sexual Surrogacy On Satisfaction, Happiness, And Well-Being, Ryan Liu-Pham

Master's Theses

The study tested the effects of sexual surrogacy, which I define as the desire to fulfill sexual needs with a surrogate target (e.g., celebrity crushes), on sexual satisfaction, relationship, happiness, and well-being. To examine this topic, I conducted a cross-sectional experimental study. After being asked about sexual desire toward either their current partner or a celebrity crush with a sexual desire behavior inventory, participants were asked to answer questions about their sexual satisfaction, relationship satisfaction, happiness, and well-being. I predicted that desire toward both surrogates and interpersonal targets will predict higher levels of sexual satisfaction, happiness, and well-being but that …

Proposed Subtypes Of Anger Rumination: Brooding And Reflection And Their Associations With Aggression, Fayth Walbridge

Master's Theses

Rumination maintains, exacerbates, and is related to several maladaptive outcomes including negative affect (e.g., sadness, anger), symptoms of depression, and aggression in samples of nonclinical and clinical populations across developmental periods (e.g., McLaughlin & Nolen-Hoeksema, 2011; Nolen-Hoeksema, 1991; Nolen-Hoeksema, 1996; Thomsen, 2006; Peled & Moretti, 2007; Yang, et. al., 2014). Recently, the construct of sadness rumination has been conceptualized as two distinct subtypes, reflection and brooding (Treynor, Gonzalez, & Nolen-Hoeksema, 2003). Brooding is considered maladaptive because feelings and situations are viewed through a negativistic lens and reflection is viewed as adaptive and uses a problem-solving approach (Lopez, 2010; Burwell & …

Application Of Machine Learning Techniques To Forecast Harmful Algal Blooms In Gulf Of Mexico, Bala Tripura Sundari Yerrapothu

Master's Theses

The Harmful Algal Blooms (HABs) forecast is crucial for the mitigation of health hazards and to inform actions for the protection of ecosystems and fisheries in the Gulf of Mexico (GoM). For the sake of simplicity of our application we assume ocean color satellite imagery from the National Oceanic and Atmospheric Administration as a proxy for HABs.

In this study we use a deep neural network trained on the 2-Dimensional time series proxy data to provide a forecast of the HABs’ manifestations in the GoM.Our approach analyzes between both spatial and temporal features simultaneously. In addition, the network also helps …

The Effects Of Using Behavioral Skills Training In Teaching Non-Aba Professionals To Implement Discrete Trial Training: A Meta-Analysis, Lindsey Bernard

Master's Theses

This quantitative meta-analysis evaluated the effectiveness of behavioral skills training (BST) for training non-applied behavior analysis (ABA) professionals to implement discrete trial training (DTT), as well as examining the methodological rigor of these studies using WWC design standards. Results indicate that BST produces large effects and the majority of studies either met design standards with reservations or met design standards. As a result, researchers and practitioners may be optimistic that BST is an effective approach to training non-ABA professionals to implement DTT.

Effects Of Adolescent Motivation And Personality On Adherence And Success In A Voluntary Residential Bootcamp Program, Lydia Sigurdson

Master's Theses

The Youth ChalleNGe Program is a voluntary program for adolescents who have dropped out of high school and is intended to address various needs of at-risk youth. As a result, individuals are motivated to enroll for an array of reasons. Though prior research on the Youth ChalleNGe Program has sought to identify individual factors that determine program outcomes, no study has considered motivation for enrollment as a predictor of program success. Further, personality traits related to goal setting and self-regulation may impact the relationship between motivation and program outcome. Archival data was gathered from 710 participants in the Youth ChalleNGe …

Mass Analysis And Raw Material Sourcing As Metrics Of Poverty Point's Socio-Political Organization, Jeffrey Lewis, Jr.

Master's Theses

Hypotheses about the socio-political organization of Poverty Point have each attempted to answer the procedures that led to the site’s construction and continued use. Mass analysis and raw material sourcing of the North Three excavation units offer an enhanced examination of the lithic activities of the Poverty Point site. These analyses provide new insight into how the site may have been utilized by those traveling to the site by assigning social values to the raw materials transported there. The results of this lithic analysis and comparison to previous investigations suggest a crucial activity that would have impacted the socio-political organization …

A Collection Of Misfits, Kayla Gates

Master's Theses

The following creative writing thesis, A Collection of Misfits, includes a critically informed introduction which places my works of fiction within the larger conversation of contemporary fiction. These short stories explore numerous ways in which characters fail to connect to the world around them. Characters falter with relationships, religion, and fitting in. The collection also explores how the use of humor works to bridge the fissure that can form around a character who fails to connect–creating a personal connection between reader and character. Taken in sum, these stories indicate that we, as humans, have a binding thread that intertwines …

An Evaluation Of Activity In A Colonial Maya Cemetery Using Femoral Cross-Sectional Analysis, Casey Lejeune

Master's Theses

Cortical bone formation in the population of Tipu, a colonial visita site in Belize, was examined here to reveal factors of their activity and address the possibility of a status-based burial plan. To answer this question, this research examined the endosteal surface of the midshaft femur using digital imaging methods. The femora from 70 individuals were photographed and examined using the BoneJ plugin in ImageJ software. The cortical bone area was compared to additional variables, including sex, age, stature, pilastric index, and burial location. It was hypothesized that sex, age, and stature would correlate with cortical bone area similarly across …

Inclusion Of Olive Or Coconut Oil In A High-Fructose High-Fat Diet Increases Liver Injury In A Pig Model Of Pediatric Nafld, Kayla A. Dillard

Master's Theses

Non-alcoholic fatty liver disease (NAFLD) represents the major cause of pediatric chronic liver pathology in the United States. The objective of this study was to investigate the effect of partial substitution of dietary lard by an isocaloric amount of olive or coconut oil on endpoints of NAFLD. Thirty-eight 15-d-old Iberian pigs housed in pens balanced for weight and sex were randomly assigned to receive 1 of 3 hypercaloric high-fructose high-fat (HFF) diets for 10 weeks: 1) lard (LAR; n=5 pens), 2) lard + olive oil (OLI, n=10), and 3) lard + coconut oil (COC; n=10). Additional pigs (BSL, n=4) were …

Lotus: A Web-Based Computational Tool For The Preliminary Investigation Of A Novel Mst Method Utilizing A Library Of 16s Rrna Bacteroides Otus, Ginger Dewitte

Master's Theses

Microbial Source Tracking (MST) is a field of study that attempts to identify the source of fecal contamination in waterways in order to assist with development of remediation strategies. Biologists at Cal Poly Center for Applications in Biotechnology (CAB) are developing a new MST method using microbes from the genus Bacteroides. Bacteroides species are host-specific microorganisms that can theoretically be used to trace back to a single host species. After fecal samples are collected, biologists use Next-Generation Sequencing (NGS) techniques to obtain only the genetic sequences of microorganisms belonging to the phylum Bacteroidetes. Investigators hypothesize that similar sequences belong …

Neural Network For Monitoring Infant Feeding Process In The Smartbottle Device, Jiajun Guan

Master's Theses

To research the relationship between Childhood obesity and infant feeding patterns, the Electrical Engineering Department at California Polytechnic State University has designed a SmartBottle device attaching to the bottom of a baby bottle to monitor the infant feeding process. This project mainly focuses on the software and firmware design, as well as the neural network design of the SmartBottle device. The SmartBottle device is designed to identify infant feeding activities and to record related data for overweight and obesity research on children. This device includes a 6-dimensional inertial sensor that contains a 3-axis digital accelerometer and a 3-axis digital gyroscope. …

Foundations Of Development: Perceptions Of Character And Leadership Development In Collegieate Judo Student Athletes, Hiroshi Yamaguchi

Master's Theses

Sports have been a tool for development within educational institutions for decades. In the United States, around 8 million high school students participate in high school sports. Very few go on to play for University Athletic Departments. Out of the 8 million students, only 495,000 (6.1%) of them will compete at NCAA schools (NCAA, 2020). Though the probability of competing in the NCAA's elite divisions is low, university students have plenty of opportunities to play and compete in sports via club/recreational sports programs, intramurals, and physical education courses. Estimates show that over 2 million higher education students in the United …

An Interdisciplinary Approach: Schizophrenia Derails Heteronormative Expectations In Psychological Narratives 2021, Bobbie Jo Weaver

Master's Theses

Required introductory psychology courses teach students a general and oversimplified version of the immense number of subfields within Psychology studies, much like introductory literature classes compress different genera throughout history into a miniscule number of “representative” texts. Nevertheless, these footholds generate an entryway into a whole new world of (specialized) exploration. Reading a text such as The Quiet Room: A Journey out of the Torment of Madness by Lori Schiller and Amanda Bennett provides a window for many students to crawl into one of Psychology’s darkest shadows, the field of abnormal psychology. Schiller’s non-fictional memoir, The Quiet Room, tells readers …

Design Of An Ultra-Wideband Frequency-Modulated Continuous Wave Short Range Radar System For Extending Independent Living, Toai-Chi Nguyen

Master's Theses

Falls in the disabled and elderly people have been a cause of concern as they can be immobilized by the fall and have no way to contact others and seek assistance. The proposed frequency modulated continuous wave (FMCW) short range radar (SRR) system, which uses ultra-wideband (UWB) signals can provide immediate assistance by monitoring and detecting fall events. The unique characteristics of this system allow for a frequency-based modulation system to carry out triangulation and sense the location of the fall through the usage of a continuous chirp signal that linearly sweeps frequency. This project focuses on the development, design …

The Relation Of Physical Activity To Quality Of Life, Balance, And Cognition In Adults With Parkinson's Disease: A Pilot Study, Alexandra Ziepke

Master's Theses

As the 2nd most common neurodegenerative disorder, Parkinson’s disease (PD) is compiled of motor and nonmotor symptoms (Dashtipour et al., 2015). Motor symptoms include bradykinesia (slow movement), resting tremor, rigidity, and postural instability, and nonmotor symptoms include cognitive delays (Steib et al., 2018). Many studies have found positive results using exercise as therapy, but few have inspected daily levels of physical activity on balance, cognition, and quality of life in adults with PD. Therefore, the purpose of this investigation is to examine the relationship between physical activity level and progressive symptoms of PD - specifically bradykinesia, balance, cognitive function, and …

The Role Of Med12, Notch1, And Notch3 In Adipose Stem Cell Self-Renewal And The Integrated Use Of Stem Cells In Public Educational Materials, Rebecca Hodnett

Master's Theses

Human adipose-derived mesenchymal stem cells offer significant therapeutic potential as an ethically sound, easily accessed source of adult stem cells. To harness their medically relevant properties, it is necessary to understand the mechanisms that control their fate. Cell state and differentiation of stem cells is determined by interactions of signaling pathways, chromatin modifiers, and transcription factors working to regulate cell-type specific gene expression profiles. Specifically, both the MED12 subunit of the Mediator complex and the Notch signaling pathway are known to individually influence hASC self-renewal. We investigated the relationship between Notch signaling and transcriptional cofactor, MED12, to elucidate a potential …

The Effects Of Increased Nacl Salinization On Riparian Plant Productivity And Decomposition Processes, Connor Gruntz

Master's Theses

NaCl salinization in inland ecosystems is increasing globally due to anthropogenic activity and may alter organism abundances and ecosystem processes. Because sodium is an essential nutrient for heterotrophs but not required by autotrophs, this salinization can alter species abundance and performance. Riparia may be particularly sensitive to increases in salinization. Here, I examined the Sodium Subsidy-Stress Hypothesis, which states that deviations from an organism’s optimal nutrient target can decrease abundance and performance, by studying the effects of NaCl salinization on plant chemistry, productivity, and decomposition rates in riparia. First, I selected three focal common riparian plants (water oak: Quercus nigra, …

Relationship Between Calcium Consumption From Dairy And Non-Dairy Sources On Bone Mineral Density Of College Students, Andrew M. Pescovitz

Master's Theses

Dairy product consumption has been on the decline for decades in the US and worldwide, and the increase in plant-based substitutes has grown substantially. Osteoporosis and the risk of bone fractures are serious public health issues. To date, little scientific-based studies have compared the relationship between calcium intake from dairy sources vs non-dairy sources and bone mineral density. The purpose of this study is to compare the relationships between calcium consumption from dairy vs. non-dairy sources and bone mineral density among college students. There was a total of 66 participants in the study including 15 (23%) males and 51 (77%) …

Associations Between Parenting Stress, Feeding Practices, And Child Eating Behaviors During The Covid-19 Pandemic, Maria G. Gonzalez

Master's Theses

The COVID-19 pandemic provides an important opportunity to understand how parenting stress during social crisis may predict child feeding practices and perceptions of child mealtime behaviors. The objective of the present study was to explore whether parents’ perceived increases in and overall levels of parenting stress during the pandemic were associated with controlling feeding practices and perceptions of child eating behaviors. Parents (n = 284) of 4–6-year-old children completed a cross-sectional online survey between March and April 2020. The survey assessed parents’ perceived change in parenting stress during the onset of the pandemic and levels of parenting stress during …

Comparing Radiation Shielding Potential Of Liquid Propellants To Water For Application In Space, John Czaplewski

Master's Theses

The radiation environment in space is a threat that engineers and astronauts need to mitigate as exploration into the solar system expands. Passive shielding involves placing as much material between critical components and the radiation environment as possible. However, with mass and size budgets, it is important to select efficient materials to provide shielding. Currently, NASA and other space agencies plan on using water as a shield against radiation since it is already necessary for human missions. Water has been tested thoroughly and has been proven to be effective. Liquid propellants are needed for every mission and also share similar …

Factors Leading To Structure Loss On The Thomas Fire, Rodolfo Uribe

Master's Theses

The recent surge in fire activity and the extent of displaced communities as a result of wildfire has increased awareness of wildfire issues nationwide (Syphard et al., 2017). Climate change, population growth, and continued development in the wildland urban interface (WUI) has contributed to a growing body of research into the underlying causes of this continued destruction (Kramer et al., 2019). There is no doubt that statewide policies, such as defensible space or building regulations, are associated with home survival (Keeley & Syphard, 2019). However, the relative effectiveness of wildfire mitigation depends on a myriad of factors specific to individual …

Condition Monitoring And Fault Detection Of Blade Damage In Small Wind Turbines Using Time-Series And Frequency Analyses, Luke H. Costello

Master's Theses

Condition monitoring systems are critical for autonomous detection of damage when operating remote wind turbines. These systems continually monitor the turbine’s operating parameters and detect damage before the turbine fails. Although common in utility-scale turbines, these systems are mostly undeveloped in distributed, small-scale turbines due to their high cost and need for specialized equipment. The Cal Poly Wind Power Research Center is developing a low-cost, modular solution known as the LifeLine system. The previous version contained monitoring equipment, but lacked decision-making capabilities.

The present work builds on the LifeLine by developing software-based detection of blade damage. Detection is done by …

The Effects Of Wort Oxygenation Scenarios On Fermentation Performance, Volatile Flavor Compound Development, And Flavor Stability In High Gravity Brewing, Ben Jabson

Master's Theses

High gravity (HG) brewing has become the most used strategy for maximizing fermenter productivity in commercial brewing. While HG brewing has many benefits, the additional stress placed on the yeast due to the higher concentration of fermentable sugars in the wort can negatively impact fermentation performance and flavor compound formation. A proper dissolved oxygen (DO) level is vital to guarantee adequate yeast performance during HG fermentations. Dissolved oxygen is vital to yeast viability throughout the fermentation process, as yeast requires oxygen to synthesize vital cell membrane components needed for continued anaerobic growth and cell division. Previous research has demonstrated the …

Biological Semantic Segmentation On Ct Medical Images For Kidney Tumor Detection Using Nnu-Net Framework, Andres Bergsneider

Master's Theses

Healthcare systems are constantly challenged with bottlenecks due to human-reliant operations, such as analyzing medical images. High precision and repeatability is necessary when performing a diagnostics on patients with tumors. Throughout the years an increasing number of advancements have been made using various machine learning algorithms for the detection of tumors helping to fast track diagnosis and treatment decisions. “Black Box” systems such as the complex deep learning networks discussed in this paper rely heavily on hyperparameter optimization in order to obtain the most ideal performance. This requires a significant time investment in the tuning of such networks to acquire …

Adaptive Laboratory Evolution Of Scenedesmus Obliquus For Increased Carbohydrate Content And Biomass Productivity, Nahel Ali

Master's Theses

The economics of microalgal bioproduct commercialization would benefit from increased accumulation of energy storage compounds, such as carbohydrates and lipids, and increased biomass productivity. This thesis explores two adaptive laboratory evolution strategies for improving Scenedesmus obliquus: single UV-mutagenesis and low light cultivation at a high dilution rate to produce cultigens with greater carbohydrate content and iterative UV-mutagenesis and selection under outdoor conditions in a raceway pond at a high dilution rate to increase biomass productivity.

Two cultigens were generated with the goal of increased carbohydrate content: K5 and K7. Both were mutagenized for 5 seconds and cultivated in 50-mL …