Digital Commons Network^™

A Floristic Study Of The Cal Poly Swanton Pacific Ranch And A New Combination In Sanicula Crassicaulis (Apiaceae), Sanicula Crassicaulis Var. Nudicaulis, Reed J. Kenny

Master's Theses

Globally we are experiencing a biodiversity crisis and potentially a sixth mass extinction event. Plant specimens are one of the best, most concrete records of biodiversity that we can create. Despite this, the rate of plant collecting has declined steeply since World War II. Now more than ever, plant collections are vital, both for the purpose of quantifying the plant biodiversity in an area and for discovering previously unrecognized diversity.

In Chapter 1, we conducted a floristic survey of the Cal Poly Swanton Pacific Ranch. The Swanton Pacific Ranch (SPR) is located north of the small town of Davenport California, …

Attacking Computer Vision Models Using Occlusion Analysis To Create Physically Robust Adversarial Images, Jacobsen Loh

Master's Theses

Self-driving cars rely on their sense of sight to function effectively in chaotic and uncontrolled environments. Thanks to recent developments in computer vision, specifically convolutional neural networks, autonomous vehicles have developed the ability to see at or above human-level capabilities, which in turn has allowed for rapid advances in self-driving cars. Unfortunately, much like humans being confused by simple optical illusions, convolutional neural networks are susceptible to simple adversarial inputs. As there is no overlap between the optical illusions that fool humans and the adversarial examples that threaten convolutional neural networks, little is understood as to why these adversarial examples …

Host Plant Resistance In Strawberries To Anthracnose And Colonization Of Crown And Root Tissue By Verticillium Dahliae And Macrophomina Phaseolina, Omar A. Gonzalez-Benitez

Master's Theses

Strawberries are considered an important crop in California where in 2018 it was in the top 5 valued fruit and vegetable commodities valued at $2.84 billion accounting for 88% of the total U.S. production. Strawberry production can be severely impacted by soilborne pathogens that can affect strawberry roots, crowns and leaves which can result in plant mortality. As much as 50 to 60% mortality can occur in one field. Pathogens responsible for such losses include Colletotrichum acutatum (syn.C. nymphaeae), Macrophomina phaseolina and Verticillium dahliae. With the phaseout of methyl bromide, host resistance and an understanding of host-pathogen interactions …

The Strawberry Rhizosphere Microbiome: Role On Plant Health And Nutrition, Eric Michael Boyd

Master's Theses

Microbial-root associations are important to help plants cope with abiotic and biotic stressors. Managing these interactions offers an opportunity for improving the efficiency and sustainability of agricultural production. By characterizing the bacterial and archaeal community (via 16S rRNA sequencing) associated with the bulk and rhizosphere soil of sixteen strawberry cultivars in two controlled field studies, we explored the relationships between the soil microbiome and plant resistance to two soilborne fungal pathogens of strawberry (Verticillium dahliae and Macrophomina phaseolina). Overall, the plants had a distinctive rhizosphere microbiome relative to the bulk soil, with higher abundances of known beneficial bacteria …

Barriers To Success: Sheep And Goat Producers In The Service-Grazing Industry, Erin A. Campbell-Craven

Master's Theses

Service-grazing is a novel term for grazing done on land not owned or rented by a livestock producer or manager, for the purpose of land management, and for which the owner or land manager receiving grazing services pays compensation to the service provider. This research project seeks to gather detailed information about producers in the Western United States, providing grazing services under this project’s definition of “service-grazing”, with a focus on those operating in California, in order to discover the business models or practices necessary to be successful within a service-based grazing operation. To this end, an online survey consisting …

Cal Poly Pier Master Plan, Troy A. Lawson

Master's Theses

The Cal Poly Pier (Pier) Master/Facility Plan (FP) document provides the vision of the future for the Pier, a marine science research facility. The Plan facilitates project development and management of the Pier while meeting university and department research goals. Specifically, the FP document establishes goals and strategies to direct long-term development of the Pier, streamlines agency approval and permit requirements, provides context for pier management, and assists the permitting process for future development as it relates to regulatory permits and programmatic growth on the Cal Poly Pier to help meet goals of the Center for Coastal Marine Sciences (CCMS). …

Mindfulness For Stress Reduction: Qualitative Analysis Of Perceptions From College Students And Mindfulness Instructors, Beth Marie Merlo

Master's Theses

Although mindfulness interventions with college students have yield positive results, many students are not continuing to engage after the interventions. This may be because very little research has been done to investigate the health behavior beliefs of college students in regard to mindfulness for stress reduction. The purpose of this investigation was to identify the most influential components of the Integrated Behavioral Model (IBM) that potentially assist with predicting college student participation in mindfulness activities for stress reduction. Interviews, informed by the IBM, were conducted with 20 current college students and 5 current mindfulness instructors working with college students. The …

Analysis Of Aquifer And Operational Conditions For Successful Soil Aquifer Treatment Of Treated Wastewater Via Synthesis Of Published Full-Scale And Laboratory-Scale Studies, Matthew I. Murray

Master's Theses

Soil aquifer treatment (SAT) of treated wastewater performance was evaluated across published full-scale and lab-scale studies developing insights on the aquifer and operational factors that affect SAT efficacy. The goal of this study was to develop a basis for predicting the contaminant removal capabilities of any given aquifer during managed recharge with treated wastewater.

Over 40 published SAT studies were reviewed and systematically compared to determine the influence of five major factors on contaminant removal performance: geologic composition, geochemical conditions, hydrogeological conditions, operational methods, and source water quality. Removal mechanisms for standard contaminants (dissolved and total organic carbon, nitrogen, and …

Analysis And Optimization Of Colorimetric Nanosensors For Rapid Detection Of Microbes In Water, Ruby A. Lang

Master's Theses

Access to safe water is a basic human right recognized by the United Nations General Assembly in 2010 (WHO, 2020). However, a least 2.2 billion people globally still are without safely managed water services meaning they use a drinking water source that can be contaminated with faeces (WHO, 2020). With such a pressing global health issue, it is clear that improvement to water systems is important and required in the Agenda 2030 Sustainable Development Goals (SDGs). However, to improve water systems and prove they are safe water sources, water quality testing must occur. A solution to this issue is the …

Altering An Epoxy-Amine Thermoset's Performance Through Varying Mix Ratios, Kiersten M. Smith

Master's Theses

Epoxy resins are used in a number of different industries and therefore have application-specific material requirements, from satellites that require materials that operate in space, to paints and coatings that require high scratch resistance and mechanical durability, to medical devices, designed to be in continuous contact with biological fluids. Commercial epoxy products come with manufacturer’s information explaining the epoxy properties and recommended preparation processing conditions, which may include epoxy resin to curing agent mix ratio (Part A : Part B), cure time, and cure temperature, for example. Due to proprietary reasons, it can be difficult to understand why these values …

Planning For Pollinators, Encouraging Biodiversity For Agriculture Resiliency, Sebastian Brian Cardoza

Master's Theses

Pollinators are essential to food production globally. Without them, the production of food becomes increasingly difficult, time consuming, and costly. Unfortunately, due to the rapid changes to our earth's physical and climatic structure millions of species are becoming classified as threatened, endangered or extinct. Among these declining species are pollinating insects such as Aphis mellifera (honeybee) and other native species. This is due to a phenomenon known as colony collapse disorder (CCD) and other native bees. The decline indicates that the future habitability of earth may be in jeopardy. The solution to this crisis is to expand the habitat of …

Abalone Fishermen, Changing Management Practices, And The Creation Of A False Dichotomy, Tyler G. Hoyt

Master's Theses

This thesis traces the history of the abalone fisheries on the California Coast and how those fisheries have been understood and shaped by humans over time. An overarching interest that guides this effort is how indigenous populations used abalone and otters (as well as other marine resources) purposefully for millennia prior to European arrival. However, this work is not entirely focused on prehistory. Instead, it shows how a lack of understanding of this prehistory shaped the conservation efforts of the California Department of Fish and Game and its ultimate decision to close the commercial fishery in 1997. In this sense, …

Modeling Artificial Groundwater Recharge In The Santa Rosa Creek Watershed, Alexander J. Murray

Master's Theses

The Santa Rosa Creek Watershed is an approximately 48 mi2 large watershed located on the central coast of California. This watershed drains to the Pacific Ocean through Santa Rosa Creek as it passes through agricultural land and the town of Cambria. Historically the groundwater within the Santa Rosa Creek Watershed has been used for irrigation, municipal and domestic uses, and the creek is critical habitat steelhead trout. During dry years, there is less water for all uses. When low groundwater levels occur, water can be drawn out of the creek and into the soil, drying out steelhead habitat. Seven agricultural …

The Influence Of The Sensory Environment On Avian Reproductive Success And Human Well-Being, Danielle Marie Ferraro

Master's Theses

Sensory pollutants such as anthropogenic noise and night lighting now expose much of the world to evolutionarily novel sound and night lighting conditions, which can have detrimental effects on humans and wildlife. In my first chapter, we exposed wild Western Bluebird (Sialia mexicana) nestlings to noise, light, and combination (i.e., noise and light) treatments. Nests exposed to noise and light together experienced less predation than control and light-exposed nests, and noise-exposed nests experienced less predation than control nests, yet overall nest success was only higher in noise-exposed nests compared to light-exposed nests. Although exposure to light decreased nestling body condition …

Maturation And Culture Media Effects On In Vitro Bovine Embryo Developmental Competence, Ciara M. Helland

Master's Theses

In vitro produced bovine embryos are critical to the cattle industry. However, these embryos have altered morphology, epigenetics, and metabolism when compared to their in vivo counterparts. The aim of this thesis was to alter maturation and culture media to improve the developmental competence of in vitro bovine embryos. This thesis is comprised of three experiments and one proof of concept study. Each experiment followed the same general layout: oocyte aspiration from Jersey or Holstein ovaries, oocyte maturation for 24 hours, fertilization with bull semen for 24 hours, then embryo culture for 7-8 days in 38.5 °C in 5% O …

Optimization And Longevity Of Functionalized Multi-Walled Carbon Nanotube-Enabled Membranes For Water Treatment, Madeleine Michael Isabella White

Master's Theses

Water scarcity is a growing concern at the global scale. Large scale water reuse is growing both in necessity and popularity. Before water reuse can be performed efficiently on a large scale or be used for potable supply, even indirectly, contaminants of emerging concern (CECs) will need to be treated at the full scale. Advanced oxidation processes (AOPs) are a form of advanced water treatment capable of treating a wide range of CECs. This study contributes to the growing field of AOPs and more specifically AOPs using ozone combined with functionalized multi-walled carbon nanotubes (MWCNTs). Ozonation of MWCNTs has been …

Attractiveness Of English Thyme (Thymus Vulgaris L.) To Arthropod Natural Enemies And Its Suitability As A Dual Use Resource, Kristina K. Van Wert

Master's Theses

Current agroecosystem management practices have a negative effect on natural enemies and their ability to control insect pests. Conservation biological control through the addition of flowering resources can manage food resources for natural enemies. These floral resources can also provide multiple ecosystem services. Study goals were to determine if perennial Thymus vulgaris L. was attractive to natural enemies and if so, could it be a dual use resource encouraging pest management and providing harvestable product. In 2018 plots in three locations were used to examine the effect of habitat throughout the growing season on the attractiveness of T. vulgaris. …

Estimating Evapotranspiration Of A Riparian Forest Using Sap Flow Measurements, James R. Solum

Master's Theses

To close the water use budget of irrigated agricultural fields in floodplains with substantial riparian corridors, it is necessary to understand groundwater usage by dominant phreatophytic vegetation, particularly when the primary source of water for irrigation comes from groundwater abstraction. We report here results of estimated evapotranspiration (ET) of a riparian forest, which were based on measurements of sap flow in phreatophytic vegetation within a riparian corridor. The riparian corridor was within a study area 75 to 140 meters wide in the lower portion of the Scotts Creek watershed, which is bounded to the west by the Pacific Ocean in …

Effect Of Endodontic Sealers On Dentin Strength, Philip Chang

Master's Theses

Introduction: The ideal endodontic sealer should be biocompatible, dimensionally stable, and have proper bond strength to dentin. The aim of this study was to apply a hoop stress to sectioned teeth discs which have been obturated with AH Plus sealer with no gutta percha, EndoSequence Bioceramic Sealer (BC Sealer) with no gutta percha, and Tetranite® with no gutta percha until fracture occurred and then compared the failure stresses.

Methods: Teeth were divided into three groups based on the sealer type used. The teeth were sectioned into 2 mm thick discs and load was applied using a piston until …

Synthesis And Characterization Of A Novel Verdazyl Spin Probe, Allisa Clemens

Master's Theses

The use of probe molecules has been integral to the understanding of protein structure and dynamics. Spin labels are commonly used as probes on molecules, such as phospholipids, peptides, proteins, or drugs in vivo. The probes enable the precise and quantitative measuring of the movements of these molecules which has led to the elucidation of function. Nitroxides are the most widely studied and employed spin probes, despite being reduced to hydroxylamines by ascorbic acid in vivo in a matter of minutes. Verdazyls provide comparable applications to nitroxide radicals, with the added benefits of having tunable conformation and hydrophobicity by altering …

Using Stable Isotopes To Determine Foraging Areas Of Leatherback Sea Turtles: Limitations Of The Isotope Tracking Technique In The Western Atlantic Ocean, Sharon Hsu

Master's Theses

Reproductive output has long been linked to habitat quality and resource availability. Individuals foraging in high-quality habitats with high resource availability will have better body conditions and higher survival rates, as well as greater reproductive output. Post-nesting, Western Caribbean leatherback turtles are known to migrate to at least two foraging regions: the western North Atlantic and Gulf of Mexico. This study had three objectives: [1] measure δ13C and δ15N values in bulk skin tissue of females nesting in Parismina, Costa Rica to reveal prior foraging region; [2] assess influence of foraging region on female body size and reproductive output; and …

Whiteness: An Ideology Of Violence And Power As Represented In Chesnutt's The Marrow Of Tradition, Schuyler's Black No More And Larsen's Passing, Keith Giles

Master's Theses

The purpose of this thesis is to investigate the representations of whiteness found in three pieces of literature. The thesis not only teases out the nuances of whiteness, but specifically analyzes the violence that whiteness inflicts upon the black body. To begin, I define what whiteness and whiteness ideology is in relation to race. After introducing the idea and functions of whiteness, I dive into the investigation by analyzing three major novels written by African American authors during the early twentieth century. While analyzing the instances of white violence in one of the three novels, the other two novels will …

Understory Response To Restorative Thinning In Coast Redwood Forests, Alyssa Hanover

Master's Theses

Restoration of late seral features in second-growth Sequoia sempervirens forests is an important management concern, as so little of the original old-growth remains. The abundance of herbaceous species provides a metric for assessing recovery in these forests where associated understory plants are adapted to closed canopy conditions. Data were collected using a stratified random sampling design across three treatments: mechanically thinned second-growth, un-thinned second-growth, and old-growth reference stands. Pairwise PerMANOVA indicated greater abundance and diversity of native herbs in old-growth and un-thinned second-growth compared to thinned stands, as well as higher measures of canopy cover, basal area, and dominance of …

Disordered Eating In Gender Minority Adults: An Evaluation And Integration Of The Gender Minority Stress And Resilience Model And The Tripartite Influence Model, Laura Ann Muratore

Master's Theses

Gender minority individuals experience elevated rates of body dissatisfaction and disordered eating in comparison to cisgender individuals; however, research assessing why this health disparity exists is limited. To address this gap, the present study investigated gender minority stress and resilience factors as proposed in the gender minority stress and resilience model (GMSR), sociocultural influence factors as proposed in the tripartite influence model of body dissatisfaction and disordered eating (TI), and an integration of these two theoretical frameworks in efforts to better explain disordered eating etiology for gender minority individuals. Results of regression analyses demonstrated that the integration of GMSR and …

Coast Redwood Stand Composition, Structure, And Fuel Load Following Prescribed Fire In Big Basin Redwoods State Park, David Cowman

Master's Theses

With the prevalence of catastrophic wildfires increasing as a response to a century of widespread fire suppression, shifts in weather patterns, and other external factors, land managers throughout the United States have sought methods to increase the resiliency of landscapes to fire. With a host of adaptations to periodic disturbance, S. sempervirens has a competitive advantage over other species when fire is present. Utilizing sixty 10-meter diameter plots from sites previously burned in 1999, 2007, and 2011, and 60 unburned control sites, data was collected on forest stand composition and structure as well as understory species composition and dominance. Line …

Evaluation Of Silica Hydride Based Amide Stationary Phase For High Performance Liquid Chromatography And Aqueous Normal Phase Separations, Emma Tardiff

Master's Theses

With many modern chromatographic advancements, silica hydride based columns (also known commercially as Type-C) represent yet another evolutionary step in stationary phase development. Type-C silica hydride columns have the ability to retain both polar and nonpolar analytes and have the ability to behave in either RP or ANP modes of separation depending on mobile phase composition. A consequence of this increased stability is that Type-C columns can be used over a wide range of mobile phase compositions, from purely aqueous to purely nonpolar organic solvents, and any combination of the two. While the retention behavior of Type-C columns depends highly …

Imperial Subjection And The Orientalist Gaze: Turning Asian Women’S Bodies Into Entertainment, Miriam Ahn

Master's Theses

This thesis analyzes the structural factors that provide meaning and space to performances where violence is served as entertainment. What are the structural conditions that turn gendered and racialized violent forms of display into enjoyment? By exploring the sex tourism in Thailand, particularly ping-pong shows, I will analyze aspects of international political economy and feminist studies to address forms of display based on the abjectness of the other. I argue that sex tourism in Thailand is not part of local culture but is upheld by imperial hegemonic perceptions of the colonized and gendered bodies. The perspectives of Orientalism, patriarchal systems, …

The Role Of High-Fructose Corn Syrup Imports In Child And Women Obesity, Anna Subirana Bofill

Master's Theses

High Fructose Corn Syrup is believed to be responsible for the increase of the obesity epidemic that is affecting both developed and developing countries, yet to date there are no rigorous analyses that quantify this effect. To estimate the impact of consumption of HFCS on obesity, I have paired country-specific data on imports of HFCS from the United Nations International Trade Statistics Database (UN Comtrade) with women and child health data from around 70 countries from 1985 to 2018. The results show that conditional on space and time fixed effects, imports of HFCS with a high concentration of fructose have …

Sports Narratives And The Examination Of Athlete Activists In The Field Of Sports, Sharon Singh

Master's Theses

ABSTRACT

Building on the scholarship of Schmidt, Frederick, Pegoraro, and Spencer (2018), the purpose of this study was to explore the narratives related to Colin Kaepernick’s and Megan Rapinoe’s athlete activism. This research was generated by conducting a thematic inductive analysis of 927 Twitter comments collected from the Twitter feeds of Kaepernick and Rapinoe during the time period of August 14th, 2016 to October 18th, 2016. The purpose of this analysis was to understand (a) how an athlete's right to protest can result in a Anti-American narrative (b) the language that characterized the public sentiment toward Kaepernick and Rapinoe (c) …

Hinduism As A Political Weapon: Gender Socialization And Disempowerment Of Women In India, Aindrila Haldar

Master's Theses

There is a growing use of religion as a political tool to control Hindu women in India, contributing to a rise in gender inequality. Immediate authoritative patriarchal domains such as household and politics, continuously speak of “protecting” Hindu women by disregarding their voices and needs. Consequently, potentially creating a loss of agency among women. This research will use inductive reasoning to understand the position of Hindu women in modern Indian society. Particularly, through the understanding of the involvement of religion in the political and household sphere. Hindu women are highly influenced by the expectations of what being an ”ideal” woman …