Digital Commons Network^™

Evidence Of Multidecadal Recruitment In The Ocean Quahog, Arctica Islandica In The Western Atlantic Ocean, Sara M. Pace

Master's Theses

Ocean quahogs (Arctica islandica) are the longest-lived, non-colonial animals known today, with a maximum life span exceeding 500 years. Limited information is available regarding recruitment, making the sustainable management of this valuable fishery a challenge. The objective of this research was to describe the age structure and growth rates for four populations of ocean quahogs from the mid-Atlantic stock to evaluate long-term recruitment trends. Clams were sectioned for age estimation to develop population age frequencies. Initial colonization began approximately 175-250 years ago depending upon site. All sites experienced an increase in recruitment beginning in the late 1800’s to …

A Close Encounter With Death: Narration In Markus Zusak's The Book Thief, Erin M. Gipson

Master's Theses

While critics have discussed Markus Zusak’s The Book Thief (2005) in terms of the Holocaust, its generic hybridity, and its crossover readership for child and adult audiences, I offer the first narratological reading of its unusual narrator: Death. This reading focuses on the rhetorical strategies underlying Death’s contradictory narration, which is at once anthropomorphized and constitutively nonhuman. Scholars of The Book Thief often assume the narrator’s omniscience, but I find that Death is crucially not omniscient; rather, he merely performs omniscience to mask his humanlike limitations. Since current terminology falls short of describing Zusak’s narration, I propose the new classification …

"There Was No Sign Of Man In It": Casting Dracula As Posthuman And Valuing The Progressive Vampire, Mary Elizabeth Wolverton

Master's Theses

Although not an immediate commercial success, Dracula has since become a seminal example of Gothic horror at the fin-de-siècle, leading not only to film, stage, and television adaptations, but also to literary reimaginings and a plethora of scholarship. I argue that the vampires in Dracula do not fit into the traditional critical understandings of the vampire; rather, they belong in two different but related categories recently theorized by science fiction studies and related to human evolution: transhuman and posthuman. I suggest that a reading of the novel that prioritizes the pervasive influence of evolutionary theory on Victorian literature encourages …

Investigating The Potential Of Plant-Derived Antimicrobials And Probiotic Bacteria For Improving The Microbiological Safety Of Dry Pet Food, Chi-Hung Chen

Master's Theses

No abstract provided.

A Comparative Analysis Of The Nutrient Composition And Digestibility Of California Perennial And Annual Grasses At Four Stages Of Growth, Elaina Cromer

Master's Theses

Beef products represent the fourth largest agricultural commodity in the state of California, valuing more than $3 billion from 2013 to 2015 (CDFA, 2016) and procure 90% of the income for the range livestock industry (FRAP, 2003). Forages found on California’s coastal, desert, foothill, and mountain ranges are the basis of the state’s beef cattle industry. Understanding their nutritional quality of these forages is important for their effective use (George et al., 2001a; Waterman et al., 2014). The objectives of this research were to investigate the nutritional characteristics, and in situ digestbilities in Angus beef cattle, of common California annual …

Temporal And Spatial Impacts Of Water Control Structures On The Benthic Infaunal Community Of A Tidally Restricted Wetland In Elkhorn Slough, Ca, Christine Marie Mann

Master's Theses

North Azevedo Pond in Elkhorn Slough, CA is a partially tidally restricted wetland that underwent an experimental ponding manipulation which increased inundation and tidal mixing within the system. This wetland has two spatially significant infaunal microsystems, south and north. Benthic cores taken before and after the manipulation showed that both the south and north infaunal communities remained dominated by the same major taxa, respectively. Both systems, however, experienced species shifts following the ponding manipulation. In the South, the non-native bivalve, Gemma gemma, declined from an average of 19,103 to 385 individuals (m2)-1 whereas the native clam, Nutricola tantilla, increased from …

Recombinant Expression And Potential Autocatalysis Of Aedes Aegypti Trypsin-Like Serine Proteases (Aaspii And Aaspiv), Diane Francine Eilerts

Master's Theses

Aedes aegypti mosquitoes can be found globally in tropical and subtropical urban areas and spread Zika, Dengue fever, yellow fever, and Chikungunya viruses. Current vector control methods are limited and nonspecific. The female Ae. aegypti mosquito uses blood meal proteins to obtain nutrients required for oogenesis; inhibition of the midgut trypsin-like serine proteases responsible for blood meal digestion may provide a novel method of vector control. Ae. aegypti blood meal digestion is complex and the role of uncharacterized serine proteases in blood digestion is unclear; specifically, a group of trypsin-like serine proteases (AaSPII–V) is expressed at constant levels before and …

Using Stable Isotope Analysis To Infer Breeding Latitude And Migratory Timing Of Juvenile Pacific-Slope Flycatchers (Empidonax Difficilis), Emily Bailey Moffitt

Master's Theses

Effective conservation of migratory species is hindered by a lack of knowledge of population links between breeding, wintering and stopover habitats. The Pacific-slope flycatcher (Empidonax difficilis) is one of the many Neotropical migratory songbirds whose populations are steadily declining throughout western North America. This research contributed to the assessment of connectivity in this species by inferring relative breeding origins and habitat selection of juvenile birds that migrate along the Pacific Flyway to the South San Francisco Bay Area in the fall. Feather data collected from July 20 to October 12, 2014 were analyzed for three stable isotopes (δ2H, δ13C, δ15N). …

A Taxonomic Revision Of Eastern North Pacific Softnose Skates (Arhynchobatidae: Bathyraja Ishiyama), James Desmond Stanley Knuckey

Master's Theses

Softnose skates (Rajiformes: Arhynchobatidae: Bathyraja Ishiyama) are the most diverse genus of skates, with 54 described species, and are readily distinguishable from their congeners by their relatively uncalcified and flexible rostral cartilages. Six species of Bathyraja are considered valid in the eastern North Pacific, including: deepsea skate, B. abyssicola, Aleutian skate, B. aleutica, sandpaper skate, B. kincaidii, fine-spined skate, B. microtrachys, Pacific white skate, B. spinosissima, and roughtail skate, B. trachura. As with other skate genera, the eastern North Pacific Bathyraja lacks a well-supported phylogeny, which leads to issues with setting catch limits and creating management plans. This study identifies …

Affective And Cognitive Effects Of Awe In Predicting Hopelessness And Brooding Rumination, Eldita Tarani

Master's Theses

This study investigated the effects of awe, as a positive emotion, in ameliorating

depressive symptoms such as hopelessness and rumination. Previous research indicates that awe is unique compared to other positive emotions in that is elicited by information rich-stimuli that facilitate shifts in cognition as one attempts to accommodate this new information to their current frame of reference. In addition, awe was found incite a self- diminishing effect that contrast the inflated significance one places on the self, during negative self-referential thinking (e.g. hopelessness). We hypothesized that exposure to an awe stimuli (video) would prompt subjects to feel less hopeless …

“You Don’T Just Eat ‘Em, You Get Match Ready With ‘Em”: A Content Analysis Of Alcohol, Food, And Non-Alcoholic Beverage Advertising In The United States During The 2014 Fifa World Cup Brazil, Melissa M. Feulner

Master's Theses

No abstract provided.

The Recovery Of Protein From Egg Yolk Protein Extraction Granule Byproduct, Irene Jennifer Kaufman

Master's Theses

In addition to proving an excellent source of nutrients, eggs are used in the food, cosmetic, and biotechnology industries for their rheological and bioactive properties. Much of the potential for the added value is in individual components of the egg, rather than the whole egg. At low speed centrifugation, yolk separates into two distinct fractions—granules and plasma. It is becoming increasingly popular in the industry to remove the plasma fraction of the egg yolk to use for its livetins, particularly immunoglobulin Y, leaving behind a granule by-product (“yellow cake”). Previous research has shown potential added-value from the granule fraction, especially …

A Live Programming Environment For Python, Noah Negrey

Master's Theses

Learning how to program can be quite difficult. Beginners face two obstacles to learning to program: developing a mental model of the steps of computation and learning the syntax of a programming language. Because programmers are prone to make mistakes that introduce errors into their code, it is important that they understand what each line of code is doing in their program. I propose that a system be built in which writing code and running code happen simultaneously. This system shows the results of code to the user immediately after it is typed; this type of system is called a …

Eulerian On Lagrangian Cloth Simulation, Kyle C. Piddington

Master's Theses

This thesis introduces a novel Eulerian-on-Lagrangian (EoL) approach for simulating cloth. This approach allows for the simulation of traditionally difficult cloth scenarios, such as draping and sliding cloth over sharp features like the edge of a table. A traditional Lagrangian approach models a cloth as a series of connected nodes. These nodes are free to move in 3d space, but have difficulty with sliding over hard edges. The cloth cannot always bend smoothly around these edges, as motion can only occur at existing nodes. An EoL approach adds additional flexibility to a Lagrangian approach by constructing special Eulerian on Lagrangian …

Optimum Design Of Composite Wing Spar Subjected To Fatigue Loadings, Juan Reuben Lazarin

Master's Theses

Composites are now being incorporated into aircraft designs because of their high strength to weight ratio compared to traditional metal materials. Due to the complexity of the material, composite parts are presently being over designed to satisfy static and fatigue requirements. A greater understanding of composite fatigue behavior will allow for even greater weight savings leading to increased fuel economy. A critical part of an aircraft that is subjected to fatigue bending loads are its wings. The forces acting on the wings include its lift distribution, powerplant, and fuel which can be carried in the wing body. When in flight …

Ecosystem-Based Management In The Morro Bay Watershed And Estuary, Lucas Earle Crandall

Master's Theses

The following thesis discusses the implementation of ecosystem-based management, an emerging concept in the field of environmental planning and management, in the Morro Bay watershed and estuary. Ecosystem-based management offers solutions to problems associated with human interaction within the natural environment; former President Barack Obama advised by the National Ocean Council, Pew Oceans Commission Report and the US Commission on Ocean Policy, has mandated implementation of this concept in coastal and marine systems (National Ocean Council, 2016). The theory behind ecosystem-based management challenges many tenets of existing natural resource management. This thesis finds the concept of ecosystem-based management as favorable …

An Investigation Of Avian Wing Tip Vortex Generation Using A Biomimetic Approach, David Stewart Martin

Master's Theses

An experimental study has been conducted to develop a process allowing the creation of biologically accurate aerodynamic test models mimicking the slotted primary feather geometry of the Brown Pelican (Pelecanus occidentalis). Preserved examples of both a full Brown Pelican wing and a single primary feather were 3D scanned and digitally reconstructed using a combination of MATLAB and CAD software. The final model was then 3D printed as a collection of smaller components using a LulzBot TAZ 6 printer and Taulman3D T-Glase PET filament. After using various surface finishing techniques to improve the finish of all 3D printed parts, …

Anaerobic Fermentation Of Food Waste And Glycerol To Hydrogen, Eric Robert Krikorian

Master's Theses

ABSTRACT

Anaerobic Fermentation of Food Waste and Glycerol to Hydrogen

Eric Krikorian

Hydrogen has several well-known advantages as a fuel and chemical feedstock, but current methods of hydrogen production are costly and energy intensive. A potentially advantageous source of hydrogen is fermentation of organic wastes, especially any abundant, low-cost wastes with a high content of simple sugars. Molar hydrogen yields from fermenters (aka digesters) are affected by pH, organic loading rate (OLR), hydraulic residence time (HRT), and substrate type. A less studied process to increase yield is sparging with low-H₂ content gas to strip H₂ from the digester …

Development And Characterization Of Tissue Engineered Blood Vessel Mimics Under "Diabetic" Conditions, Shelby Gabrielle Kunz

Master's Theses

The development of tissue engineered blood vessel mimics for the testing of intravascular devices in vitro has been established in the Cal Poly tissue engineering lab. Due to the prevalence of cardiovascular disease in diabetic patients and minimal accessible studies regarding the interactions between diabetes and intravascular devices used to treat vascular disease, there is a need for the development of diabetic models that more accurately represents diabetic processes occurring in the blood vessels, primarily endothelial dysfunction. This thesis aimed to create a diabetic blood vessel mimic by implementing a high glucose environment for culturing human endothelial cells from healthy …

Complementary Companion Behavior In Video Games, Gavin Scott

Master's Theses

Companion characters in are present in many video games across genres, serving the role of the player's partner. Their goal is to support the player's strategy and to immerse the player by providing a believable companion. These companions often only perform rigidly scripted actions and fail to adapt to an individual player's play-style, detracting from their usefulness. Behavior like this can also become frustrating to the player if the companions become more of a hindrance than they are a benefit. Other work, including this project's precursor, focused on building companions that mimic the player. These strategies customize the companion's actions …

Evaluation Of Pc-Based Virtual Reality As A Tool To Analyze Pedestrian Behavior At Midblock Crossings, Kristina Lynn Mai

Master's Theses

The aim of this research was to analyze if current generation PC-driven virtual reality simulations can be used to accurately mimic and therefore, observe behavior at a crosswalk. Toward that goal, the following research tasks were carried out: a) Designing a 3D virtual crosswalk and recruiting volunteers to wear the HTC Vive headset and to walk across the street, b) Setting up cameras near the midblock crosswalk on University Drive at California Polytechnic State University, San Luis Obispo to observe pedestrians, and c) Comparing pedestrian behavior data from both the virtual and real midblock crosswalk. The comparison was based on …

Effects Of Food Consumption On Cell Proliferation In The Brain Of Python Regius, Stacy Star Habroun

Master's Theses

Neurogenesis is an important and vastly under-explored area in reptiles. While the ability to generate new brain cells in the adult mammalian brain is limited, reptiles are able to regenerate large populations of neuronal cells. Pythons exhibit a characteristic specific dynamic action (SDA) response after food intake with an increase in metabolic rate that facilitates processing the meal. Associated with this change in SDA, pythons (Python spp.) also exhibit impressive plasticity in their digestive and cardiovascular physiology due to the sheer magnitude of the increase in organ growth that occurs after a meal to speed digestion, absorption, and assimilation of …

The Population Genetics Of Morro Bay Eelgrass (Zostera Marina), Julia Gardner Harencar

Master's Theses

Seagrass populations are in decline worldwide. Zostera marina (eelgrass), one of California’s native seagrasses, is no exception to this trend. In the last 8 years, Morro Bay, California has lost 95% of its eelgrass. Eelgrass is an ecosystem engineer, providing important ecosystem services such as sediment stabilization, nutrient cycling, and nursery habitats for fish. The failure of recent restoration efforts necessitates a better understanding of the causes of eelgrass decline in this estuary. Previous research on eelgrass in California has demonstrated a link between population genetic diversity and eelgrass bed health, ecosystem functioning, and resilience to disturbance and extreme climatic …

The Investigation And Characterization Of The Reaction Of 2-Methylfuran And 2-Methyl-3-Buten-2-Ol With O(3p) And The Photodissociation Of Xylyl Bromide Isomers, Yasmin Fathi

Master's Theses

This thesis has studied the oxidation behavior of different biofuels or additives, 2-methyl-3-buten-2-ol and 2-methylfuran, in combustion experiments at the Chemical Dynamics Beamline held at the Advanced Light Source of the Lawrence Berkley National Laboratory. The oxidation of these fuels were initiated through O(³P) and the combustion experiments were analyzed using a multiplexed chemical kinetics photoionization mass spectrometer with tunable synchrotron radiation. Products of the different reactions were identified using kinetic profiles and further characterized using the photoionization spectra. The amount of each species was calculated using branching fractions.

Additionally, the unimolecular dissociation of the xylyl bromide isomers …

Agricultural Technology Adoption And Adaptation Under Climate Change: Microevidence From Niger, Berenger Djoumessi Tiague

Master's Theses

Many regions of Sub-Saharan Africa (SSA) are experiencing fast increases in human population pressure and urbanization. By 2050, feeding a planet of 9 billion people will require an estimated 50 percent increase in agricultural production. Farmers in in the Sahel are exposed to a highly variable weather over time, and to their limited adaptive capacity, therefore often use livestock as income generator, export earnings, and as insurance against weather risk. There is an increasing demand for livestock products, which increase pressure on crop residues use on the land. In this study, I use panel socio-economic data combined with village rainfall …

Aspirations As A Component Of Life Satisfaction: A Look At Female Microfinance Borrowers In Oaxaca, Mexico, Joseph E. Kemler

Master's Theses

This research is an extension to the Oaxaca Hope Project by B. Wydick and T.J. Lybbert. How does an individual gauge her own satisfaction with life? Previous research has noted that many domains make up overall life satisfaction, i.e. career satisfaction, family life satisfaction & social life satisfaction. A burgeoning topic in this regard is the role that aspirations play in life satisfaction. Using survey data from female microfinance borrowers in Oaxaca, Mexico this project attempts to analyze the affect previous aspirations have on life satisfaction. By creating an “aspirational window” we objectively attempt to gauge the relationship between “high” …

Investigation Of Absolute Photoionization Cross Sections Of Cyclic Ketones, Low Temperature Combustion Of Propargylamine By Synchrotron Photoionization Mass Spectrometry, And Computational Study Of Hypersalts, Chelsea Liliana Price

Master's Theses

The presented research was carried out at the University of San Francisco. Measurements of absolute photoionization cross sections of both cyclopentanone and cyclohexanone, as well as the Cl-initiated oxidation of propargylamine were completed through the use of a multiplexed photoionization mass spectrometer (MPMIS) located at the Lawrence Berkeley National Laboratory Advanced Light Source (ALS). Furthermore, the design of novel LiF containing hypersalts, constructed from superhalogens and superalkalis, were explored due to their enhanced ionization energies and electron affinities. All determined calculations were completed using the CBS-QB3 composite model with the Gaussian09 program.

Development And Application Of A 30-Year Vegetation Dataset To Assess The Impacts Of Fence Removal Within The Kruger To Canyons Biosphere Reserve, South Africa, Helaine M. Linden

Master's Theses

Maintaining habitat heterogeneity is favorable when conserving protected areas due to its positive relationship with biodiversity. Fence removal across protected areas improves connectivity and allows herbivory to occur over a larger landscape extent. In the mid-1990’s, reserves within the Kruger to Canyons Biosphere Reserve (K2C) removed their fences, becoming connected to Kruger National Park (KNP). The fundamental research objective was to determine how fence removal influenced the vegetation dynamics within the reserves residing in the K2C. We had three goals: 1) determine if multiple satellite sensors could be used within the TIMESAT program to provide robust vegetation metrics that measure …

Invoquer La Mer : Vers Une Écopoétique Du Poème Chez Saint-John Perse, Victoria Farrell

Master's Theses

Saint-John Perse's poetry is known for featuring elments of nature. This study of his body of poetry, which includes an in-depth ecocritical reading of the poem Amers, considers his work from an ecocritical viewpoint.

Proportional Suppression Of Nmda And Ampa Mediated Synaptic Responses In Layer 2/3 Pyramids From Rat Visual Cortex By Adenosine, Justin T. Ellenberg

Master's Theses

Adenosine (ADO) is an abundant endogenous neuromodulator, with a generally suppressive effect on excitatory synaptic transmission. Previous research has shown that in different brain structures adenosine may have heterogeneous effects on the balance of N-methyl-D-aspartate (NMDA) receptor-mediated and non-NMDA receptor-mediated currents. In hippocampal pyramids, adenosine proportionally reduced the NMDA and non-NMDA mediated excitatory currents, whereas dopaminergic neurons in rat midbrain, adenosine preferentially reduced NMDA currents. It is known that in layer 2/3 pyramidal neurons of rat visual cortex, adenosine suppresses excitatory synaptic transmission. However, it remains unknown whether adenosine has the same effect on NMDA and AMPA-mediated currents. Here we …