Index Catalog // ScholarsArchive@OSU

Investigating Grain Boundaries in BaCuS1-xSexF Using Impedance Spectroscopy

Creator:: Horgan, Briony
Abstract:: Impedance spectroscopy is a method of modeling materials with equivalent circuits to determine electrical properties, such as the resistivity and the dielectric constant. We explore impedance spectroscopy, both theoretically and experimentally through applying the method to samples of BaCuS1-xSexF. Grain boundary effects were dominant in the results, and although they...
Resource Type:: Undergraduate Thesis

Use of tethered prey for estimating the impact of the invasive European green crab

Creator:: Hauck, Laura L.
Abstract:: Various mollusks, including small bivalves and gastropod snails, are a common food source for intertidal crabs. Prey opening techniques used on hard-shell prey are dependent on claw size and morphology. For example, large, strong claws can crush a snail outright while smaller, weaker claws leave characteristic peels, pulls and upper...
Resource Type:: Undergraduate Thesis

How the Sun Drives Us: Photovoltaics in the US and Germany

Creator:: Hyde, Alison
Abstract:: With the realization that traditional means of providing useful energy have formidable environmental and economical repercussions, many counties have begun to explore more benign and sustainable energy sources—renewables. Photovoltaics (PV), a sub-group of renewable energy technologies, convert incident solar radiation into electrical power. Germany, the US and Japan are racing...
Resource Type:: Undergraduate Thesis

Development of a colorimetric test kit to determine enzymatically produced pyruvic acid in sweet onions

Creator:: Merrill, Dawn C.
Abstract:: Sweet onions are valued for their unique flavor and praised for their health and dietary character. Onion sweetness is perceived as the degree of pungency decreases. Pungency can be quantitatively determined in onions by measuring enzymatically produced pyruvic acid. The onion industry quantifies a sweet onion as one having a...
Resource Type:: Undergraduate Thesis and Presentation

Effects of Perfluorinated Compounds on GnRH Gene Expression in vitro

Creator:: Bathke, Rebecca E.
Abstract:: Perfluorinated chemicals have been widely used in industry for their superior surfactant qualities. Because of their widespread usage and resistance to photolytic and biodegradation mechanisms, as well as their ability to undergo long-range atmospheric transport, these compounds have become ubiquitous in the world-wide water supplies. Of particular interest are perfluorooctanoic...
Resource Type:: Undergraduate Thesis and Presentation

Immunohistochemistry Studies of Tumor Necrosis Factor Αlpha and Interferon Gamma Expression in Pseudocapillaria tomentosa Infected and Uninfected Zebrafish

Creator:: Lo, Lalee C.
Abstract:: Tumor necrosis factor alpha (TNF α) and interferon gamma (IFN γ) were initially recognized as inflammatory mediators produced by immune cells in response to infectious agents or foreign material. (1,5) However, over the past decade much research in mammalian species has indicated that these proteins also play key roles in...
Resource Type:: Presentation and Undergraduate Thesis

Wind Energy: An Analysis and Comparison of Wind-Power Development in the United States and Spain

Creator:: Wilhelmsen, Scott
Abstract:: This essay seeks to analyze the wind-power policies of Spain, the United States and the world in order to better understand the past, present and future potentials of the resource. The growing demand for energy, concerns about global warming, and the need for increased energy security encourage societies to embrace...
Resource Type:: Undergraduate Thesis

Antibiotic Resistance Gene Transfer in Oysters as a Result of Fecal Pollution

Creator:: Cooper, Rebecca
Abstract:: Antibiotic resistance is an increasing problem in many species of bacteria today, with pathogens an important focus. Fecal contamination of shellfish is already a concern due to potential pathogens. This report examines the possibility of resistance gene transfer between microbes, due to fecal bacteria, within the oyster. In this study,...
Resource Type:: Undergraduate Thesis

Quantifying the Potential of Native Plants for Improving Pollination and Biological Control in Agroecosystems

Creator:: Winfield, Tammy L.
Abstract:: Agricultural areas can be inhospitable to the attraction and maintenance of beneficial insects like natural enemies and pollinators and this can result in a decrease in the ecosystem services of pollination and pest control that these insects supply. If habitat can be created and maintained on-farm, an increase in the...
Resource Type:: Undergraduate Thesis

Integration of embryonic zebrafish and passive sampling device extracts to explore effects of pesticide mixtures

Creator:: Corvi, Margaret
Abstract:: Pesticides are ubiquitous, with more than one billion tons of pesticide products used in the United States annually. These compounds are characterized by their toxic effects to the target organism; however, pesticides are also well known for their deleterious effects to non-target species. Because pesticides have ecological and human health...
Resource Type:: Undergraduate Thesis and Presentation

Superior Anti-tumor Activity Exhibited From a Gemcitabine Prodrug Incorporated into Lecithin-Based Nanoparticles

Creator:: Sandoval, Michael
Abstract:: Cancer is class of diseases that has great diversity and unfortunately is one of the leading causes of death in the United States. Chemotherapy remains an important cancer treatment modality, and superior chemotherapeutic drugs are constantly being sought. Gemcitabine is an anti-tumor chemotherapeutic drug and it is the first line...
Resource Type:: Poster, Undergraduate Thesis, and Presentation

The toxicogenetic effects of a chitosan based hemostatic control patch in rat models

Creator:: Colburn, Andrew J.
Abstract:: Chitosan based hemorrhage control dressings provide effective external hemorrhage control while having few side effects. Known residual contaminants present in chitosan formulations include endotoxins and proteins known to stimulate gene expression in the liver. This study investigated gene expression in the liver using rat bio-compatibility models to gain knowledge regarding...
Resource Type:: Undergraduate Thesis and Presentation

Genetic variation of Renibacterium salmoninarum genes in infected salmonids

Creator:: Burnett, Jeffrey R.
Abstract:: Renibacterium salmoninarum is the causative agent of bacterial kidney disease in both wild and farmed salmonid species worldwide. The genome of this pathogen has significant synteny to the ubiquitous, soil-dwelling Arthrobacter spp. though it is 1.9 Mb smaller, suggesting that reductive evolution has occurred. Recently, our group finished sequencing and...
Resource Type:: Undergraduate Thesis and Presentation

Effects of land management on carbon and nitrogen in soils from New Zealand

Creator:: Holcomb, Jess
Abstract:: The ability of soils to store large quantities of carbon (C) makes them an important factor in the global C cycle. Small changes within soil C can lead to large changes in atmospheric C. Land management practices can influence the amount of C that is stored within the soil and...
Resource Type:: Undergraduate Thesis and Presentation

Potential of eradicating noxious weed seeds from the soil with heat and carabid seed predators

Creator:: Marshall, Nicole S.
Abstract:: The goal of this project was to develop and test non-herbicidal techniques that remove nonnative plant or weed seeds from the top 2 inches of the soil. The Nature Conservancy (TNC) is currently restoring prairies in the Willamette Valley. Some areas of the Pacific Northwest have already seen loss of...
Resource Type:: Undergraduate Thesis and Presentation

Laboratory studies of growth conditions of Vibrio parahaemolyticus in Pacific oyster (Crassostrea gigas) with international considerations to shellfish-associated illnesses in South Korea

Creator:: Lee, Jeehye
Abstract:: Vibrio parahaemolyticus, a naturally occurring halophilic pathogen, is seasonally abundant in marine and estuarine environments. It is also the leading cause of gastroenteritis in humans world-wide. Numerous outbreak incidences associated with the pathogenic Vibrio parahaemolyticus contaminations in oyster products have raised public-health concerns as well as economic challenges to the...
Resource Type:: Undergraduate Thesis

Whole system perspective : Steelhead, Onchorhynchus mykiss, glutathione s-transferase as a biomarker of chlorpyrifos exposure

Creator:: Pecore, Rachael G.
Abstract:: Organophosphate insecticides may produce sublethal, adverse effects on salmonid growth, reproduction, maturation, swimming, and feeding. Chlorpyrifos, an organophosphate insecticide, was detected by the Oregon Department of Environmental Quality in the Hood River and tributaries during March 1999 at levels exceeding state water quality standards in the range of 0.011-0.482 μg/L....
Resource Type:: Undergraduate Thesis

Field validation of laboratory tests used in screening Port-Orford-cedar for resistance to Phytophthora lateralis

Creator:: Wing, Adam B.
Abstract:: Port-Orford-cedar (POC) (Chamaecyparis lawsoniana (A. Murl.) Parl) is an important tree species native the coastal ranges of southern Oregon and northern California. The tree is a false-cedar in the cypress (Cupressaceae) family and is used for timber and planted as an ornamental. The tree in most of its native range...
Resource Type:: Undergraduate Thesis

Distribution of dissolved, bioavailable PAHs in the lower Willamette River, Portland Harbor, Oregon

Creator:: Visalli, Solyssa Gabrielle
Abstract:: Polycyclic aromatic hydrocarbons (PAH) are common pollutants of aquatic systems in urban environments. Due to their lipophilicity, persistence, toxicity and carcinogenicity, they are chemicals of considerable concern. The Portland Harbor includes a large industrial section with numerous current and historic sources for PAH contamination. Runoff from a large metropolitan area...
Resource Type:: Undergraduate Thesis

Suitability of selected enzyme assays as future soil quality indicators

Creator:: Taylor, Anne Elizabeth
Abstract:: Deforestation, intensive agriculture and chemical use all can cause long-lastingn negative impacts on soil health. With all the vital functions that soils perform and the potential for further soil degradation, it is important that standards of soil quality or soil health be implemented. Soil aggregation is considered to be a...
Resource Type:: Undergraduate Thesis

Immunohistochemical localization of cytochrome P450s IA, 2K6, 2K7, 3A65 and 3C1 and expression of P4501A in tumor sensitive and resistant lines of juvenile zebrafish

Creator:: Taylor, Amber
Abstract:: Five new anti-zebrafish cytochrome P450 (CYP) antipeptide polyclonal antibodies were tested for tissue specificity using immunohistochemistry. The antibodies are for the zebrafish CYPs IA, 2K6, 2K7, 3A65 and 3C1. Three of these antibodies were also compared to existing antibodies made against CYP isozymes in rainbow trout (Oncorhynchus mykiss). Individual staining...
Resource Type:: Undergraduate Thesis

Efficacy of entomopathogenic fungi for control of the cabbage maggot, Delia radicum (L.) (Diptera: Anthomyiidae)

Creator:: Snelling, Jane E.
Abstract:: The cabbage maggot, Delia radicum (L.) (Diptera: Anthomyiidae) is a serious pest of cruciferous crops (i.e. broccoli, cabbage, turnip, rutabaga) in North America and Europe (Coaker and Finch, 1971; Whistlecraft et al., 1985). The adult flies lay eggs around the base and in cracks at the soil surface around wild...
Resource Type:: Undergraduate Thesis

Anthocyanin and antioxidant analysis of sweet and tart cherry varieties of the Pacific Northwest

Creator:: Simonian, Sonny
Abstract:: Northwest cherry cultivars including Prunus avium 'Bing', Prunus avium 'Rainier', Prunus avium 'Royal Anne' and Prunus cerasus 'Montmorency' were separated into epidermal tissue, flesh and pit and cryogenically milled with liquid nitrogen. These samples as well as whole samples from each variety were extracted with acetone followed by a chloroform...
Resource Type:: Undergraduate Thesis

Genetic diversity of Frankia in three different Oregon soils with co-occurring actinorhizal hosts

Creator:: Shaffar, Sarah J.
Abstract:: Little is known about Frankia, a gram-positive, nitrogen-fixing bacterium, because of the difficulty associated with isolating pure cultures. This nitrogen-fixing symbiosis involves Frankia and the roots of actinorhizal host plants belonging to eight plant families and 25 genera. These plants are important pioneer species traditionally found in nitrogen-poor soils and....
Resource Type:: Undergraduate Thesis

Spatial and temporal distribution of soil mesofauna in a managed grassland ecosystem

Creator:: Neese, Kristine Maree
Abstract:: Little is known about upland agricultural grassland soil invertebrate composition and its contribution to ecosystem functioning. Soil-dwelling organisms play a central role in soil formation, plant nutrition, and are significant food contributors for organisms in several trophic levels. Information is needed about mesofauna seasonal population and composition trends throughout the...
Resource Type:: Undergraduate Thesis

Trace element concentration in tree-rings biomonitoring centuries of environmental change

Creator:: Padilla, Kimberly L. and Anderson, Kim A.
Abstract:: Inductively coupled plasma mass spectrometry (ICP-MS) was used to examine trace element concentration in treerings over three and half centuries to assess macro-trends of environmental change. Tree-rings of a 350+ year old mammoth ponderosa pine (Pinus ponderosa) were analyzed for element concentration and evaluated versus local and global historical events....
Resource Type:: Article

Comparison of small-scale and field-scale saturated hydraulic conductivity : A tale of cores and drains

Creator:: Owens, Joshua M.
Abstract:: Saturated hydraulid conductivity (Ks) is a central soil physical property in determining water movement and contaminant transport through soils; hence modeling this system requires an accurate determination of K. Decimeter-scale KS measurements employing cores or infiltrometers are used frequently, but field-scale KS values are required to encompass the full range...
Resource Type:: Undergraduate Thesis

Effects of gluten composition and molecular weight distribution on the noodle making potential of hard white wheats

Creator:: Ong, Yee-Ling
Abstract:: A set of flour samples with protein content ranging from 9.7 - 13.3 % was used for this study to evaluate the effectiveness of HMW-GS, SEHPLC and mixograph characteristics as screening tools for noodle texture. The sample set had a large variation in HMW-GS composition with Payne score ranging from...
Resource Type:: Undergraduate Thesis

Understanding epistasis in linkage analysis : The Kap and lks2 loci in the Oregon Wolfe Barley poputlation

Creator:: McCoy, Serena B.
Abstract:: An organisms' genotype may not be reflected in its phenotype. For example, epistasis - the interaction of non-allelic genes can cause deviations from expected phenotypic ratios. The epistatic interaction between the hooded (Kap) and short-awned (lks2) loci in barley (Hordeum vulgare) precludes the localization of the Kap locus, based on...
Resource Type:: Undergraduate Thesis

The use of lichen to monitor semivolatile organic compounds in high elevation ecosystems

Creator:: Moore, Eli
Resource Type:: Undergraduate Thesis

DNA mismatch repair and cancer : Identifying phenotypic consequences of hMLHI mutations

Creator:: Nice, Benjamin T.
Resource Type:: Undergraduate Thesis

Optimization of environmental factors for effective detection of Bean yellow mosaic virus in Verbena x hybrida

Creator:: Obermeyer, Angela L.
Abstract:: Horticultural and nursery crops are the leading agricultural commodity in Oregon. Among currently grown nursery plants, Verbena x hybrida is a staple ornamental. It is grown and shipped worldwide, thus requiring a high level of certainty concerning the plants’ health and potential viability. V. x hybrida cultivars have been infected...
Resource Type:: Research Paper

Salal in old growth forests : The significance of gaps in understory carbon balancewith and examination of the link between climate change and rural livelihoods in developing countries : an opportunity for Latin America

Creator:: Mayfield, Joyce Bybee
Abstract:: Gaps in the forest canopy allow more light to reach the understory. Since light in the understory is heterogeneous, understanding the physiological processes in gaps and non-gaps will improve estimates of carbon balance. This research outlines an approach for defining carbon balance for Salal (Gaultheria shallon Pursh.), a dominant understory...
Resource Type:: Undergraduate Thesis

Soil surface CO2 efflux across the climatic gradient of the Oregon Transect for Terrestrial Ecological Research (OTTER)

Creator:: Martin, Mark A.
Abstract:: Soil CO2 efflux is a major contributor of CO2 to the atmosphere. The rate that CO2 is respired out of the soil is called the soil flux (Fs). Many variables alter Fs. These variables differ drastically in the variety of ecosystems found on the earth. It is important to understand...
Resource Type:: Undergraduate Thesis

Proteomic analysis of lipid raft fractions derived from mouse brain

Creator:: Safic, Masa
Abstract:: The ionotropic glutamate receptors are ligand-gated ion channels that mediate the majority of excitatory neurotransmission in the brain. The three classes of ionotropic glutamate receptors are alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA), N-methyl-D-aspartate (NMDA), and kainite. These three classes have unique subunits. NMDA receptors play important roles in development, forms of synaptic plasticity,...
Resource Type:: Undergraduate Thesis

Cloning, expression and purification of gene products involved in peptidoglycan synthesis for Chlamydia trachomatis

Creator:: LeBlang, Joy
Abstract:: Chlamydiae are obligate intracellular bacterial pathogens with a unique biphasic life cycle that consists of an infectious but non-dividing form, called elementary bodies (EB), and a noninfectious but metabolically active form, called reticulate bodies (RB). Chlamydia has an unusual process of cell division of which still remains uncharacterized subject matter;...
Resource Type:: Undergraduate Thesis

Granary-site selection by acorn woodpeckers in Benton County, Oregon

Creator:: Johnson, Eric M.
Abstract:: The acorn woodpecker (Melanerpes formicivorus) is among the most common primary cavity nesters of the Oregon white oak (Quercus garryana) woodlands. Understanding their selection of granary sites is important in evaluating habitat quality and management actions. I hypothesized that granary locations would be consistent with the optimal foraging theory. Site...
Resource Type:: Undergraduate Thesis

Characterization of CTIP1 interaction with HP1

Creator:: Huddleston, Cortny
Abstract:: COUP-TF interacting protein 1 (CTIP1) is a novel C2H2 zinc finger protein that mediates transcriptional repression of ARP1, a member of the COUP-TF subfamily of orphan nuclear receptors [1]. Here we show that CTIP1 interacts with heterochromatin-associated protein 1 (HP1) in vitro and in cells. This interaction suggests the existence...
Resource Type:: Undergraduate Thesis

Differences in dry matter production and nitrogen uptake and partitioning among spring wheat (Triticum Aestivum L.) varieties

Creator:: Hitchcock, Todd
Abstract:: Grain protein concentration of wheat is influenced by numerous factors. When determining a wheat variety's ability to produce protein, the plant's ability to uptake and translocate nitrogen is critical. A greenhouse study was conducted to assess differences in nitrogen use among different wheat varieties. The objective was to determine if...
Resource Type:: Undergraduate Thesis

The crystal structure of San Miguel sea lion virus type 5 and the possible association of caliciviruses to spontaneous abortions in terrestrial animals

Creator:: Lounsbury, Jeff, Karplus, Andrew, and Smith, Alvin
Abstract:: Crystallizing a virus can be difficult and not always successful. Forty-eight salts, buffers, and precipitating agents were used in the hanging drop preparations in attempts to crystallize the San Miguel sea lion virus type 5 (SMSV-5). The first attempt resulted in 22 of the 48 solutions forming a precipitate. The...
Resource Type:: Undergraduate Thesis

Indole-3-carbinol and related compound effects on biochemical parameters with respect to trout tumorigenesis

Creator:: Hall, Kelly P.
Abstract:: Indole-3-carbinol (13C), a metabolite of glucobrassicin, is found in cruciferous vegetables. It is able to act as an inhibitor or promoter of carcinogenesis depending on the species, the carcinogen and when it is given in relation to the carcinogen. This is probably due to the fact that it reacts in...
Resource Type:: Undergraduate Thesis

Age-related response of isolated rat hepatocytes to menadione and (R)-[alpha]-lipoic acid

Creator:: Graves, Jason T.
Abstract:: Age-related decline in the capacity of endogenous antioxidant systems complicates pharmaceutical use by the elderly by potentially increasing the toxicity of some compounds. Of particular interest is chemical detoxification via glutathione (GSH) and attendant GSH-requiring detoxification enzymes, e.g. GSH peroxidases (GPX) and GSH S-transferase (GST). These enzymes have been shown...
Resource Type:: Undergraduate Thesis

Population dynamics and conservation biology of Lupinus sulphureus ssp. kincaidii (Fabaceae)

Creator:: Erhart, Teman
Abstract:: Kincaid's lupine (Lupinus sulphureus ssp. kincaidii [Smith] Phillips) is a federally listed Threatened plant of Willamette Valley prairies. Both low reproduction, due to seed coat dormancy, and competition from invasive plants may threaten the longterm viability of this species. In separate studies, I investigated seed germination and an invasive species...
Resource Type:: Undergraduate Thesis

Measurement of semi-volatile organic compounds in conifer needles from Sequoia National Park, CA

Creator:: Deskin, Lisa Marie
Abstract:: An analytical method was adapted to extract semi-volatile organic compounds (SOCs) from conifer needles. Needles from Abies concolor (white fir) and Pinus contortas (lodgepole pine) from Sequoia National Park (SNP) were collected during the summer of 2003, and analyzed for SOCs. The goal of this research was to determine differences...
Resource Type:: Undergraduate Thesis

A survey of three key species of ambrosia beetles (Coleoptera: Curculionidae: Scolytinae: Monarthrum scutellare, Xyleborus dispar, Xyleborinus saxesenii) in Oregon's Willamette Valley nursery industry

Creator:: Cramer, Eryn E.
Abstract:: The nursery industry plays a critical role in Oregon's economy. An increase in wood-boring insect, or borer, activity has impacted the industry. The goal of this research is to determine key borer species in the nursery industry, flight times so targeted spray schedules can be established, and assess grower knowledge...
Resource Type:: Undergraduate Thesis

Fate of ¹⁵N-labelled atrazine in a wetland mesocosm, Fate of [superscript 15] N-labelled atrazine in a wetland mesocosm

Creator:: Corliss, Dorian
Resource Type:: Undergraduate Thesis

Genetic selection for avian embryo development at an elevated temperature

Creator:: Colvin, Wendy R.
Abstract:: A genetic selection study to determine the effects on egg hatchability and subsequent chick performance of Japanese quail eggs incubated at a 38.9° C (102° F) dry bulb temperature (Selected, S) when compared to 37.8 C (100°F) (Control, C) was conducted for four consecutive generations. Eggs from a randomly mated...
Resource Type:: Undergraduate Thesis

Comparison of the coat protein gene of raspberry bushy dwarf virus from raspberry and blackberry

Creator:: Chamberlain, Crystle J.
Abstract:: Raspberry bushy dwarf virus (RBDV) infects red raspberry and black raspberry worldwide. Infection causes reduced vigor and drupelet abortion leading to crumbly fruit and reduced yields. While this crumbly fruit can still be used in juice, jam, and preserves, it cannot be used for the more valuable fresh and individually...
Resource Type:: Undergraduate Thesis

Growth regulator interactions in the diageotropica : Mutant of Solanum lycopersicon

Creator:: Canfield, Brandon M.
Abstract:: The diageotropica (dgt) mutation has been proposed to affect either auxin perception or responsiveness in tomato plants. Auxins and cytokinins are plant growth regulators known to interact with each other via a variety of mechanisms. Here, we report the interactions of auxins and cytokinins in VFN8 wild-type and dgt mutant...
Resource Type:: Undergraduate Thesis

DNA mismatch repair and 0[superscript 6]-methylguanine toxicity : Testing the futile repair cycle hypothesis

Creator:: Brodeur, Timothy J.
Abstract:: Cell lines deficient in certain genes of the DNA mismatch repair (MMR) system show a marked resistance to the cell killing or apoptotic effects of DNA alkylating agents. The molecular mechanism for this resistance is not yet understood, but is currently of great interest because of the recent use of...
Resource Type:: Undergraduate Thesis

A measure of agricultural literacy in Willamette Valley fourth grade students

Creator:: Boatner, Sara M.
Resource Type:: Undergraduate Thesis

Comparison of uterine protease and protease inhibitors present in the pregnant and non-pregnant llama

Creator:: Bidstrup, Lisa A.
Abstract:: Llama reproductive physiology is unique when compared with other livestock species. Llamas carry 95-98% of all pregnancies in the left uterine horn. It is believed that there is a physiological difference between the uterine horns that contributes to this phenomenon. This study examined the uterine environment for protease and protease...
Resource Type:: Undergraduate Thesis

Genetic analysis of interactions between the plant hormones auxin and ethylene

Creator:: Barckley, Kristi K.
Abstract:: Auxin and ethylene regulate many important aspects of plant growth and development and are essential to the plants survival. They help regulate such diverse processes as cell elongation, growth of adventitious roots, fruit growth, germination, and a variety of other processes. Few studies have examined how the hormones auxin and...
Resource Type:: Undergraduate Thesis

Lexicon development of appearance and texture descriptors for melted cheddar cheese using microwave and oven heating

Creator:: Asato, Karisa
Abstract:: A lexicon to define the sensory properties of melted Cheddar cheese was created using a trained descriptive panel. The lexicon characterized appearance (surface rupture, meltedness, oiliness, and edge browning) and texture (stringiness, stretchiness, springiness, firmness, toothpull, smoothness, cohesiveness, denseness, and chewiness). Three brands of commercially available shredded Cheddar cheese were...
Resource Type:: Undergraduate Thesis

Relationships among soil pH, redox potential, and ferrous iron content data obtained from various field and lab methods

Creator:: Aleshire, Dannelle R.
Abstract:: Relationships among soil pH, redox potential, and ferrous iron content data obtained from various field and lab methods were determined, with the following 4 objectives: 1.) Compare pH values obtained in the field to those obtained in the lab 2.) Evaluate different methods to measure pH in field 3.) Determine...
Resource Type:: Undergraduate Thesis

Black truffle economics : Evaluating the costs and returns of establishing and producing Tuber melanosporum in the Willamette Valley, Oregon

Creator:: Alvis, Heather E.
Abstract:: The following paper is an objective view on the viability of growing the truffle Tuber melanosporum in the Willamette Valley. Included in this study are the history of the truffle, biological cycle, habitat description, method of cultivation and an enterprise budget for commercial production in the Willamette Valley. The truffle,...
Resource Type:: Undergraduate Thesis

Effects of Sarcocystis neurona infection on cell-mediated immune responses in horses

Creator:: Barth, Laura A.
Abstract:: Sarcocystis neurona is the 1responsible for the disease Equine Protozoal Myeloencephalitis (EPM). Exposure rates to S. neurona across the United States is about 50%, yet only about 2% of exposed horses develop EPM. The cell-mediated immune (CMI) response is hypothesized to be important for protective immunity against this disease. The...
Resource Type:: Undergraduate Thesis

Use of sheep in the control of an invasive bunchgrass

Creator:: Scholz, Ryan
Abstract:: Studies were conducted to assess influencing the effectiveness of sheep for grazing control of false brome (Brachypodium sylvaticum) an invasive grass species. Orphan lambs were exposed to false brome via grass extract in their milk and naturally reared lambs were exposed by grazing dense stands of false brome with their...
Resource Type:: Undergraduate Thesis and Presentation

Identifying microRNAs by automated phylogenetic and structural analysis

Creator:: Smith, Daniel P.
Abstract:: Motivation: It can take considerable amounts of time and effort to use existing computational tools to analyze a small RNA sequence for the purpose of determining if it is characteristic of microRNA. It is similarly tedious to search for homologs to known microRNA sequences in the rapidly growing collection of...
Resource Type:: Undergraduate Thesis

Developing the Zebrafish (Danio rerio) As a Model to Evaluate the Toxicity of Chlorinated and Non-Chlorinated Solvents

Creator:: Wenning, Matthew
Abstract:: Chlorinated and non-chlorinated solvents are used in a variety of industrial processes and as a consequence, they have become environmental contaminants as well. Because of this, they lead to both occupational and environmental exposures. Exposure to these compounds can potentially result in various forms of neurological damage with a wide...
Resource Type:: Undergraduate Thesis and Presentation

Degradation of Extracellular Matrix Proteins by Bovine Embryonic Urokinase-Type Plasminogen Activator

Creator:: Hansen, Lance
Abstract:: The bovine blastocyst is composed of a one-celled layer of trophectoderm surrounding a fluid filled sac called the blastocoel and a ball of cells called the inner cell mass (ICM). On Day 8 (Day 0=fertilization) in bovine embryos, endodermal cells leave the ICM, migrate over the extracellular matrix (ECM) on...
Resource Type:: Undergraduate Thesis and Presentation

“SeW: A Search for Selenosulfide Bonding” and “Severity of Damage Inflicted on Intercellular Disulfide Bonds as a Result of UV Radiation”

Creator:: Dutcher, Kendall
Abstract:: Part 1: White muscle disease (WMD), a degenerative muscle disease brought on by a deficiency of the essential trace nutrient selenium, is thought to be mediated by the protein Selenoprotein W (SeW). In its relationship with WMD, SeW, like many selenoproteins, binds to glutathione, serving some purpose in redox mechanisms...
Resource Type:: Undergraduate Thesis and Research Paper

Expression of prolactin in feline mammary adenomas and adenocarcinomas

Creator:: Trummel, Danielle K.
Abstract:: Mammary tumors are the third most common tumor in cats after cutaneous neoplasia and lymphosarcoma. More than 80% of feline mammary tumors are adenocarcinomas, which are similar to human mammary adenocarcinomas in their biologic behavior and histologic characteristics. Despite treatment with radical mastectomy, feline mammary adenocarcinoma is associated with a...
Resource Type:: Undergraduate Thesis and Presentation

Method development in in vitro immune response

Creator:: Huber, Jacob
Abstract:: The AhR is a ligand-activated transcription factor that mediates the potent immunosuppressive effects of TCDD. AhR-dependent changes in gene expression appear to alter the differentiation of CD4+ T cells to induce a population of CD4+CD25+ T regulatory cells (Tregs) that suppress the immune response. Ascertaining if and how the AhR...
Resource Type:: Undergraduate Thesis and Presentation

The Distribution and Abundance of a Non-native Eelgrass, Zostera japonica, in Oregon Estuaries

Creator:: Dudoit, Chana Makale’a
Abstract:: Biological introductions may considerably alter the composition and community dynamics of invaded areas thereby changing many ecosystem processes including productivity, decomposition, nutrient cycling and hydrology. The effects on native species may be obscured by a lack of information on distribution and abundance patterns. The Japanese eelgrass, Zostera japonica, was introduced...
Resource Type:: Undergraduate Thesis

Characterization of a Sporulation-Specific Kinase in Clostridium perfringens

Creator:: Danielson, Bryan
Abstract:: Clostridium perfringens type A isolates produce the spore-specific enterotoxin, CPE, upon sporulation in the gastrointestinal tract of humans and animals. Spo0A is a response regulator representing the major transcription factor for sporulation initiation in C. perfringens. In Bacillus subtilis, a multicomponent phosphorelay involving five histidine kinases (KinA-KinE), the intermediate response...
Resource Type:: Undergraduate Thesis and Presentation

Rate of prey consumption in two intertidal crab species : the introduced European green crab, Carcinus maenas, and native dungeness crab, Cancer magister

Creator:: Davidson, Timothy Mathias
Abstract:: The prey consumption rates of two estuarine crab species were compared: the introduced Carcinus maenas and the native Cancer magister. Similar sized crabs of each species were placed into individual perforated plastic boxes and then placed in a seawater table. Each crab was offered 50 Mytilus trossulus mussels (15-25mm) per...
Resource Type:: Undergraduate Thesis

Vernalization gene architecture as a predictor of growth habit in barley

Creator:: Heckart, Douglas
Abstract:: Winter hardiness in barley (Hordeum vulgare) is a trait targeted by breeding programs in order to expand the potential area of adaptation of fall-sown cereals. Vernalization requirement is an important factor in winter hardiness. A vernalization requirement is an extended period of low temperature required for transition from the vegetative...
Resource Type:: Undergraduate Thesis and Presentation

In search of ecological advantages : Mycorrhizal facilitation of big huckleberry Vaccinium membranaceum (Doug.)

Creator:: Stocking, Peter
Abstract:: Temperate evergreen forests of the Pacific Northwest support big huckleberries (Vaccinium membranaceum) despite their nutrient impoverished soils. Acquisition of nitrogen and phosphorous are the major nutrients limiting V. membranaceum. The plant’s access to these resources is linked to their mycorrhizal symbiosis. To learn more about the symbionts of eriaceous plants...
Resource Type:: Undergraduate Thesis

Studies on a transgenic approach to decrease gliadin content in wheat

Creator:: Bell, Shannon M.
Abstract:: Celiac disease, an autoimmune response triggered by the consumption of seed storage proteins of cereals, affects an estimated 1% of the human population. In the case of wheat (Triticum aestivum L.), one of the world’s most consumed cereals, alcohol-soluble proteins, the gliadins, have been identified as the allergy-eliciting agents. Previous...
Resource Type:: Undergraduate Thesis

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