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Predicting Slender False Brome (Brachypodium Sylvaticum) Invasion In The Santa Cruz Mountains, California, Janine Ellen Bird

Master's Theses

Early detection of an invasive species facilitates control and eradication. Slender false brome (Brachypodium sylvaticum) was first discovered in the Santa Cruz Mountains of Central California in 2003 as a non-native grass in redwood forests, competing with native vegetation. The current infestation in the Santa Cruz Mountains, estimated to be 300 acres, is concentrated in San Mateo County and could be eradicated. This study sought to determine most likely locations of slender false brome in the Santa Cruz Mountains by assessing environmental attributes of known presence locations using species distribution modeling and Maxent software. The study used 1,320 species presence …

Assessing The San José State University Simultaneous Polydrug Use Questionnaire -- Online (Sjsu Spuq -- Online) A Pilot Study, Joseph P. Hennessee

Master's Theses

Alcohol use is one of the most prevalent forms of drug use among college students. Because of the near ubiquity of college drinking, additional research is needed to determine whether such alcohol use is related to any cognitive impairment. Furthermore, many of those who use alcohol consume one or more additional drugs simultaneously, and little research has assessed whether such simultaneous polydrug use (SPU) has a further effect on cognitive functioning. This study was developed to bridge these two gaps in the literature and aid in the development of the SJSU SPUQ - Online.

Through the use of computerized tasks …

Designing Affordances On Embedded Interfaces, Gabriela Madalina Istan

Master's Theses

The purpose of this study was to examine the effects of a user interface on users' performance during an online shopping checkout task. Two interfaces were developed using the principles of Rasmussen's SRK model: a high-affordance and a

low-affordance interface. Seventy undergraduate and graduate students performed a simulated online shopping task with the two interfaces. It was hypothesized that the high-affordance interface would require less time and fewer clicks to conduct the shopping task when compared to a low-affordance interface. In addition, it was predicted that participants would prefer the high-affordance interface. The findings revealed participants spent more time on …

The Prevalence Of The Uncultivated Bacterium Tm7a In Human Subgingival Plaque, Jamsheed Adrian Ghadiri

Master's Theses

Most bacteria are yet to be cultivated, and some uncultivated bacteria have been associated with human diseases. TM7, an uncultivated candidate division of bacteria, has been recently associated with periodontitis, a disease if left untreated causes tooth degradation and gum decay. A subgroup of TM7, known as TM7a, has been found in both human samples and activated wastewater. TM7a from these two locations are as high as 99.7% similar by 16S rRNA gene sequence analysis, leading researchers to believe both TM7a strains are very similar functionally. TM7a has been extensively studied in activated wastewater. However, little is known of its …

Response Of Waterbirds To Salt Pond Enhancements And Island Creation In The San Francisco Bay, Stacy M. Moskal

Master's Theses

Historically, San Francisco Bay supported the largest salt pond complex on the Pacific coast of North America, and these areas have been used by large numbers of migrating and wintering waterbirds for more than a century. In 2003, salt ponds in the South San Francisco Bay were purchased with a goal of restoring 50-90% of the 6100 ha of former salt ponds to replace lost tidal marsh habitats. However, a major challenge for the restoration project has been maintaining the abundance of non-breeding waterbirds in a smaller footprint of managed ponds. Thus, in 2009-2010, Pond SF2 was enhanced with 30 …

Mastermind-Like 1-Dependent Notch Target Gene Activation Requires A Sequence-Paired Site And A Tata Box, Cassandra Agbayani Ramos

Master's Theses

Notch signaling plays an important role in mammalian cellular proliferation, apoptosis, and differentiation. To activate target genes, the Notch intracellular domain (NICD) forms a complex with CBF1 and Mastermind-like protein (MAM). The Notch activation complex binds to a response element containing the consensus sequence RTGRGAR (R= purine) on target gene promoters. The promoter of one well characterized target gene, Hes1, contains four Notch response elements (NREs). Site-directed mutagenesis and reporter gene assays were used to examine the activation of Hes1 by mutating individual and combinations of NREs. Results indicated that NREs 2 and 4 are important for Hes1 activity, confirming …

Effects Of Compression On The Temperature Distribution Of A Tissue-Mimicking Material During High-Intensity Focused Ultrasound (Hifu) Ablation, Austin Robbins Roth

Master's Theses

Local blood flow near a high-intensity focused ultrasound (HIFU) target has been shown to decrease ablation effectiveness and predictability, creating a barrier to clinical use for breast cancer treatment. This study investigated the effects of compression on HIFU ablation of a perfused tissue-mimicking material. Gellan gum-based phantoms, with thermal and acoustic properties similar to those of soft tissue, were ablated with a 1.13 MHz HIFU transducer while being subjected to varying levels of external compression. Phantoms were designed with an embedded 6 mm diameter vessel meant to mimic a thermally significant blood vessel near a breast tumor. The internal temperature …

Evaluating Hypotheses That Explain Non-Continuous Responses To Syllable Periods ("Skipping") During Phonotaxis By Female Acheta Domesticus, Tori Joy Steely

Master's Theses

One way to classify female cricket phonotactic response is as "non-skipping" or "skipping." "Skipping" is defined as crickets that respond to a non-continuous range of calling songs. This investigation evaluates the temporal aspects of typical phonotactic protocols and attempts to determine if "skipping" is due to a filtering mechanism or if "skipping" is an artifact of testing protocol. Rather than a notch filter or testing parameters inhibiting a phonotactic response to a syllable period within the range of a band pass filter, I hypothesize that "skipping" occurs as a result of the probabilistic nature of phonotaxis.

Features Of Copulation And The Copulation Call In Glaucous-Winged Gulls (Larus Glaucescens), Amanda Sandler

Master's Theses

Glaucous-winged gulls (Larus glaucescens) breed along the Pacific Northwest coast where they perform highly stereotypical behavior patterns, including associated vocalizations. Early studies suggested the copulation call functions in maintaining pair bonds. Recent studies, however, challenge the idea that strengthening pair bonds is the only function of this call. I described the spectral and temporal features of the copulation call and investigated whether copulation behaviors varied over the course of the 2012 nesting season. During continuous observations from a blind in daylight hours, I documented the start and stop time for every copulation in a sample area of a nesting colony …

The Effect Of Bmi On The Age Of Menarche In Adolescent Girls, Samara R. Sterling

Master's Theses

Problem. Over the past century, the age of menarche has consistently declined in the United States and globally. Obesity has also increased by 82% globally over the past 20 years. Obesity, as measured by BMI percentiles in children, may contribute to the declining age of menarche. -- Method. Adolescent girls ages 12-19 were examined in California and Michigan. Physical development and the age of menarche were assessed through an online questionnaire. Height and weight measurements were taken at a clinic and converted to BMI percentile values. -- Results. A negative correlation was observed between BMI percentile values and the age …

Restoring Native Plants Following Invasive Malephora Crocea (Coppery Iceplant, Aizoaceae) Eradication On Anacapa Island, Nathan William Hale

Master's Theses

To avoid unintended complications of invasive species eradication, it is important to understand the potential implications of the techniques used in species eradication efforts. This study aimed to compare how different methods of removing Malephora crocea affect the survivorship of planted seedlings of native perennial plants on Anacapa Island. Employing a randomized complete block design in an M. crocea stand, three removal treatments were tested: 1) hand-pull; 2) spray with herbicide and leave skeletons; and 3) spray and then remove skeletons after 2.5 months. In each treatment, seedlings of three species (Leptosyne gigantea, Frankenia salina, and Grindelia …

This Could Be A Game!": Defining Gamification For The Classroom, Darcy Elaine Osheim

Master's Theses

Instructors find a gap between what they experienced in school in the mid-to-late 20th century and the experiences of students entering college in 2012/13. In the United States, the influx of almost universal access to technology has marked this generation in a way the previous generations must work to understand, and gamification is a strategy used in areas like marketing to gain participation from this age group. Gamification is a strategy that employs game mechanics, techniques, and theory in areas that traditionally are not set up to function like a game. The purpose of this study was to define gamification …

The Effect Of Dietary Methylmercury On Na+, K+, -Atpase Activity And Growth In Fall-Run Chinook Salmon (O. Tshawytscha), John Negrey

Master's Theses

Hatchery reared Chinook salmon from California's Central Valley were fed for 67 days (Apr-Jun, 2008) on fish pellets mixed with either 0, 1, 3, or 5 µg*g-1 methylmercury hydroxide. Weight, fork length, condition factor, and Na+,K+- ATPase measurements were determined every two weeks and a 96-h seawater challenge was conducted at the conclusion of the experiment.

Results from two-way ANOVA, with treatment and date as independent variables, indicated no significant differences for weight (F3, 32 = 1.38; P = 0.280), length (F3, 32 = 0.986; P = 0.412) and condition factor (F3, 32 = 0.239; P = 0.869). Post-hoc analysis …

Alpha-Synuclein Aggregates Activate The Nlrp3 Inflammasome Following Vesicle Rupture, Rudy Orlando Cedillos

Master's Theses

Parkinson's disease (PD) and related synucleinopathies are progressive neurodegenerative disorders that feature the accumulation of intracellular inclusions known as Lewy bodies (LBs) in the brain. The presynaptic protein α-synuclein is the primary constituent of LBs and has been documented to play a major role in the pathogenesis of synucleinopathies. Recently, aggregated α-synuclein has been implicated in prompting microglia-mediated inflammation, a process associated with the progression of neuronal death in neurodegenerative disorders. Although the mechanisms surrounding the induction of neuroinflammation are not well understood, the recently discovered inflammasome-forming NLR proteins have emerged as regulators of inflammation. In this study, we sought …

Evidence For Renewal And Reconstitution Of Marginal Zone Macrophages In Young And Aged Mice, Erika Bahamon

Master's Theses

Aging in humans and mice correlates with decline in immune health, affecting both innate and adaptive immunity. Response against blood-borne bacterial pathogens is compromised because of the deterioration of the marginal zones of the spleen and decrease in frequency of marginal zone macrophages (MZM). This thesis asked if low cell turnover is the cause for the decrease of MZM, using cell proliferation to indicate cell turnover in spleens of mice. First, evidence showed MZM proliferation occurred in spleens of young mice and was decreased in the MZM from aged mice. Second, transfer of young bone marrow into old mice replenished …

Aquatic Macroinvertebrate Response To Invasion And Subsequent Removal Of Typha × Glauca From Great Lakes Coastal Marshes, Kimberly Anne Greene

Master's Theses

Aquatic macroinvertebrates are important in wetland ecosystems; many fish and wildlife species depend upon them for food resources and they aid in nutrient cycling. Wetland macroinvertebrate communities are influenced by plant community composition; as such, this study examined two implications of invasive hybrid cattail, Typha × glauca (Typha), on aquatic macroinvertebrate communities in northern Great Lakes coastal wetlands: 1) how the presence of nearly monotypic stands of Typha alters wetland aquatic macroinvertebrate communities and 2) how manual removal of Typha, via mowing and manual tilling, impacts these invertebrate communities along with wetland plant communities. I found that …

Activity Patterns And Spatial Resource Selection Of The Eastern Garter Snake (Thamnophis Sirtalis Sirtalis), Matthew Gregory Most

Master's Theses

Snake species usually exhibit seasonal variations in activity patterns, home-range size and the use of respective habitat. Using mark-recapture protocols I marked 96 individual Thamnophis sirtalis sirtalis specimens in Lake Forest, IL to determine the independent variables that best explained habitat selection in a population of Eastern Garter Snakes (T. s. sirtalis). Specifically, I focused on the relationship between seasonal movement and home range size of male and female garter snakes. I analyzed the habitat preferences and spatial ecology of Eastern Garter Snakes during the 2011 sampling season and modeled the relationship between preferred or avoided habitat, in conjunction with …

Selective Expansion Of B Cells By Intestinal Microbiota, Karina Ochoa

Master's Theses

In rabbits, antibody diversity and B cell expansion are generated in gut-associated lymphoid tissues (GALT), in an antigen- and T cell-independent mechanism, and require interaction with intestinal microbiota. I investigated, in vitro, the mechanism by which commensals drive GALT reactions. Bacteria were isolated from the GALT of rabbits and identified by 16sRNA sequencing. I found that the commensals can bind to Ig, independently of their specificity. In addition, a ~20kDa bacterial molecule was immunoprecipitated with recombinant Ig molecules. Stimulation of B cells with selected bacterial molecules induced the activation of B cells. Stimulation of B cells through TLR2 induced the …

Assessing The Effects Of Titanium Dioxide Nanoparticles On Microbial Communities In Stream Sediment Using Artificial Streams And High Throughput Screening, Alexandra Ozaki

Master's Theses

Nano-titanium dioxide (nano-TiO2) is an engineered nanomaterial used in a wide array of commercial products. The production and use of large amounts of nano-TiO2 is resulting in the unintended release to the environment. Nano-TiO2 is known to be cytotoxic due primarily to its ability to generate reactive oxygen species, and negative impacts on a variety of organisms have been demonstrated, but the effects of nano-TiO2 on complex microbial communities under ecologically relevant conditions have rarely been tested. We conducted a controlled manipulative experiment using recirculating model streams dosed with a one-time amendment of 1mg L-1 nano-TiO2 (specifically P25). Within one …

Antibodies To Inhibit Clostridium Difficile Adhesion To Human Gut Epithelial Cell Line, Wonbeom Paik

Master's Theses

Clostridium difficile infection (CDI) is a major hospital-acquired diarrhea that can cause life-threatening complications such as pseudomembranous colitis. CDI is caused by colonization of host with C. difficile, a Gram positive, anaerobic bacterium known to produce toxins that cause disease. Normally, the gut microbiota protects the host from CDI, but disruption of the microbial composition through antibiotic treatment can leave one vulnerable for CDI. To date, no vaccines for preventing CDI are available.

In this study, the potential of antibodies directed against specific surface molecules of C. difficile to block bacterial adherence to host gut epithelial cells was studied, in …

Forest Regeneration On The Osa Peninsula, Costa Rica, Manette E. Sandor

Master's Theses

Woody species diversity of secondary forest has the potential to converge with that found in old growth forest. This study is the first to examine multiple aspects of species and reproductive trait diversity, and their relationship to each other, across a successional chronosequence. Species richness and species diversity increases with increasing age of forest. Diaspore size and diversity as well as fruit size generally increased with increasing age of forest, but fruit size diversity did not. Abundance of animal-dispersed species increased whereas wind-dispersed species decreased in abundance over succession. Insect-pollinated individuals were most abundant overall. Diaspore diversity, pollination diversity, and …

Weather-Based Damage Prediction Models For Electric Distribution Networks, David W. Wanik

Master's Theses

From thunderstorms to hurricanes, electric distribution networks are subject to a wide range of warm weather storm events. Tropical Storm Irene (2011) and Hurricane Sandy (2012) are two events in recent memory that disrupted over half of The Connecticut Light and Power Company’s (CL&P) service territory, which left some customers without power for up to eleven days. This research study investigates a damage prediction framework for both thunderstorms and hurricanes that combines two generalized linear models to probabilistically determine the occurrence and extent of damages, known as trouble spots, to the overhead power distribution network. The models are inputted with …

Effects Of Neonatal Hypoxic Ischemic Brain Injury On Spatial Working Memory, Amanda L. Smith

Master's Theses

Children born prematurely or at very low birth weight (VLBW) have an increased risk for hypoxic ischemic brain injury (HI). HI refers to a lack of adequate blood and oxygen flow in the brain. HI can also occur in the term infant due to birth complications such as prolonged labor, placental dysfunction, or cord prolapse. In both populations (though exact patterns of neuropathology vary) brain damage is likely to occur in the form of decreased hippocampal and cortical volume, and enlargement of the ventricles (Kesler et al., 2004, Nagy et al., 2009). Resulting neuropathology can in turn lead to cognitive …

Landscaping Israel: Power And Resistance On The Ground, Janey Kemp

Master's Theses

No abstract provided.

Cultural Traditions And The Reproductive Health Of Somali Refugees And Immigrants, Nancy S. Deyo

Master's Theses

Millions of Somalis began fleeing their country in 1991 to escape the civil war. The largest Diaspora of Somali refugees in the United States currently reside in Minnesota. Utilizing a qualitative research approach, four focus groups with 25 Somali women, two focus groups with 12 Somali men, one focus group with Somali religious leaders and seven in-depth interviews with American healthcare professionals were conducted in Minneapolis to help develop culturally sensitive reproductive health programs for Somali mothers. Twenty key distinctions between Somali cultural traditions and Western medicine were identified. For many Somali women, prenatal care is a new concept. There …

Do Culturally Engaging Reading Materials Matter? An Analysis Of Rural Libraries In Burkina Faso, Erica Ernst

Master's Theses

Academics have noted the lack of culturally relevant reading materials in African libraries. Book collections are primarily composed of donated materials from western countries intended for a western, rather than African audience. This research project aimed to gain insight onto children’s reading preferences in the rural Burkina Faso and to learn about the popularity of local photo books that were added in 2009. Quantitative methods examined library book checkout records in three categories of African, French, and local photo books. Additionally the library subscription records were used in order to gain information about the children including age, gender, and ethnicity. …

Oil, Power, And Discourse: How Chevron Evaded Its Dues To The Indigenous Communities Of The Ecuadorian Amazon, Kine Norland

Master's Theses

Abstract

The principal objectives of this thesis were to shed lights on the backside of oil and to question the great power of big corporations. I researched why Chevron refused to acknowledge its legal obligation to remedy the complex problems it has caused in the Ecuadorian Rainforest. The catastrophes the indigenous communities have been facing are about to change as a result of grass root mobilization against Chevron. By the use of observations, discourse analysis of the media, and the use of theories from Michel Foucault, I was able to explain how Chevron has managed to escape from the terrible …

Tremulous Jaw Movements Induced By The Vmat2 Inhibitor Tetrabenazine, Samantha J. Podurgiel

Master's Theses

Parkinsonism is a movement disorder characterized by several cardinal motor symptoms: resting tremor, akinesia, bradykinesia, rigidity, and postural instability. Parkinsonian resting tremor can be modeled in rodents using the tremulous jaw movement model. Tremulous jaw movements (TJMs) are defined as “rapid vertical deflections of the lower jaw that resemble chewing but are not directed at any particular stimulus.” TJMs occur in a frequency range of 3-7 Hz and are induced by a number of pharmacological manipulations that parallel those seen in human Parkinsonism including dopamine (DA) depleting agents, DA antagonists, and cholinomimetic administration. Additionally, TJMs can be attenuated using antiparkinsonian …

Theta Dynamics: Speed, Acceleration And Contribution To Cognition, Lauren L. Long

Master's Theses

No abstract provided.

An Analysis Of Human Disturbance To Rocky Intertidal Communities Of San Luis Obispo County, Grant Tyler Waltz

Master's Theses

ABSTRACT

An Analysis Of Human Disturbance To Rocky Intertidal Communities Of San Luis Obispo County

Grant Tyler Waltz

The number of coastal areas open to public access in California and San Luis Obispo County is increasing due to the acquisition by California State Parks of land previously owned by private entities. For example, California State Parks acquired property from the Hearst Corporation in 2005, which included 18 miles of coastline. California State Parks is responsible for providing public access in these newly acquired areas and also for maintaining the health of the natural systems found on these properties. Part of …