Index Catalog // ScholarsArchive@OSU

Studies toward the total synthesis of phorboxazole A

Creator:: Kuntiyong, Punlop
Abstract:: Studies toward the total synthesis of a highly potent cytotoxic marine natural product, phorboxazole A, were conducted and resulted in a route to an advanced intermediate, C4-C32, for this purpose. A key feature of our approach is the stereoselective synthesis of two cis-2,6-disubstituted tetrahydropyrans present in the macrolide portion of...
Resource Type:: Dissertation

Analysis of high-risk hispanic families in a family support program : characteristics, factors affecting parenting skills over time, and age-paced newsletter efficacy

Creator:: Weatherspoon, Joni
Abstract:: Two studies investigated the characteristics of high-risk Hispanic parents with young children who were enrolled in a primary prevention home visitation program targeting first birth families. In the first study, more and less acculturated high-risk Hispanic families were compared to high-risk non-Hispanic White families on differences in demographic characteristics, risk...
Resource Type:: Dissertation

Early forest succession following clearcuts in western Oregon : patterns and abiotic controls

Creator:: Yang, Zhiqiang
Abstract:: Historical aerial photos were used to examine the early phase of forest succession after stand replacement disturbance, covering the Coast Ranges Province (CRP) and the western Cascades Province (WCP) of western Oregon. The study consisted of two components: characterizing the pattern of forest succession in western Oregon; analyzing the influence...
Resource Type:: Dissertation

The blueberry : composition, anthocyanins, and polyphenolics

Creator:: Lee, Jungmin
Abstract:: Frozen blueberries were pilot-plant-processed into juice and concentrate by 2 treatments (heat and SO2), and a control. Qualitative, and quantitative anthocyanin and polyphenolic content were monitored after each processing step. Major losses occurred after the initial processing steps. Juice processing by-product contained a substantial amount of anthocyanins and polyphenolics (>42%...
Resource Type:: Dissertation

Synthesis of furanoeremophilane sesquiterpenoids

Creator:: Shanmugham, Meenakshi Sundaram
Abstract:: Two approaches to the tricyclic core of the furanoeremophilane sesquiterpenoids are described. The first approach entails a projected Diels-Alder/retro Diels-Alder reaction of an acetylenic oxazole 64. Construction of the pivotal aldehyde 67 commenced from ketone 68. The acetyenic moiety was then introduced via a Felkin-Ahn addition of lithiopropyne to aldehyde...
Resource Type:: Dissertation

Nitrogen use in container-grown woody ornamentals

Creator:: Sandrock, David Ray, 1971-
Abstract:: Lasting, effective solutions to nitrogen (N) loss from container nurseries must address layers of complexity ranging in scale from whole system nursery management to gene expression. Group-based On-site Active Learning (GOAL) was developed to aid nursery managers and related stakeholders (e.g. neighbors, policy makers, regulating agencies, researchers) in developing a...
Resource Type:: Dissertation

Solubility of aluminosilicates in kraft green and white liquors

Creator:: Wannenmacher, P. Nick
Abstract:: The increasing occurrence of aluminosilicate caused complications in krafi pulp mills can be attributed to the closing of purge points and the expanded use of contaminated feedstocks and recycled fiber sources. An active purge of aluminum and silicon from the chemical recovery cycle must be undertaken in order to maintain...
Resource Type:: Dissertation

Causes and consequences of uncertainty in the application of a biogeochemical model to a large geographic region

Creator:: Kennedy, Robert Emmet, 1970-
Abstract:: When biogeochemical models are applied to large regions, the values of key model parameters are often unknowable. Through field and modeling studies, I examined the potential impact of such uncertainty on estimates of carbon cycling in western Oregon. I found that variation in key leaf traits could be interpreted ecologically,...
Resource Type:: Dissertation

Two new roles for the TYMV tRNA-like structure : translation enhancement and repression of minus strand synthesis

Creator:: Matsuda, Daiki
Abstract:: Some positive-strand RNA plant viruses possess a transfer RNA-like structure (TLS) at the 3'-terminus of their genomic RNAs. The closest mimicry to tRNA is exhibited by the valylatable TLSs from tymoviruses and furo-like viruses, which are able to interact with key cellular tRNA enzymes: [CTP, ATP]:tRNA nucleotidyltransferase (CCA NTase), valyl-tRNA...
Resource Type:: Dissertation

Natural history and ecology of larval Lost River suckers and larval shortnose suckers in the Williamson River-Upper Klamath Lake System

Creator:: Cooperman, Michael S.
Abstract:: We monitored larval Lost River and shortnose suckers from natal beds in the Williamson and Sprague rivers to nursery grounds in Upper Klamath Lake. Downstream movements occurred at night, in the middle of the channel, and on the falling limb of the hydrograph. Ages, sizes, and developmental stages of larvae...
Resource Type:: Dissertation

An investigation of tenth grade students' views of the purpose of geometric proof

Creator:: Gfeller, Mary Katherine
Abstract:: The purpose of this investigation was to describe tenth grade students' views of the purposes of geometric proof within the context of their learning. Classroom observations, the curriculum, assessment tools, journal questions, and a preconceptions questionnaire were used to provide context for the views expressed by students from a single...
Resource Type:: Dissertation

New bioactive natural products from marine algae and cyanobacteria

Creator:: Sabry, Omar Mohamed
Abstract:: This thesis is an account of investigation on the natural products deriving from various marine algae and has resulted in the discovery of eleven novel bioactive metabolites. Isolation and characterization of these new molecules were carried out using different chromatographic techniques and by analyses of different spectroscopic data, respectively. Using...
Resource Type:: Dissertation

Olivine and plagioclase-hosted melt inclusions and their application to determining parental arc magmas

Creator:: Kohut, Edward John
Abstract:: Three broadly interrelated problems of critical significance to the proper interpretation of melt inclusion (MI) data are addressed in this thesis. The first issue, the petrogenesis of anorthitic plagioclase phenocrysts in MORB lavas, has relevance due to the presence of numerous MI in many high-An feldspars. This problem was addressed...
Resource Type:: Dissertation

Application of green fluorescent protein (GFP) for studing interactions between Ophiostoma piceae and Trichoderma harzianum in freshly sawn Douglas-fir sapwood

Creator:: Xiao, Ying
Abstract:: While microbial colonization of wood is presumed to be characterized by a myriad of interactions between numerous organisms, studying these processes is often difficult owing to the opaque nature of the wood and the inability to readily distinguish among the many species colonizing the material. One method for enhancing the...
Resource Type:: Dissertation

Water exercise effects on bone density and fall risk in postmenopausal women

Creator:: Littrell, Tanya R.
Abstract:: Exercise may be the most effective strategy to reduce osteoporotic fractures in older adults because of its potential to reduce both bone loss and fall risk. It is unclear whether water exercise is an effective strategy to reduce fracture risk in postmenopausal women. PURPOSE: To examine the effects of a...
Resource Type:: Dissertation

A multi-product, multi-depot periodic distribution problem

Creator:: Parthanadee, Parthana
Abstract:: Physical distribution is one of the key functions in logistics systems, involving the flow of products from manufacturing plants or distribution centers through the network of transportation to consumers. The function is very costly, especially for the distribution industries. During the past decades, the significance of physical distribution has increased...
Resource Type:: Dissertation

The effect of biological deterioration on the performance of nailed oriented strand board sheathing to Douglas-fir framing member connections

Creator:: Kent, Scott M.
Abstract:: Service life prediction models for light-framed wood structures require an extensive quantity of empirical data on deterioration pathologies for the numerous structural components, as well as mechanistic approaches to determine their capacity at various levels of deterioration. The data and models presented in this study satisfy a portion of the...
Resource Type:: Dissertation

Phylogeny and taxonomy of parasites of the Multivalvulida (myxoza:myxosporea) based on comparative DNA sequence analysis

Creator:: Whipps, Christopher Michael
Abstract:: Relationships among myxozoan parasites of the order Multivalvulida were examined through comparative DNA sequence analysis. Members of this group of parasites is known for the damaging effects they have on their fish hosts, especially commercially important species. Most species infect muscle, where they form cysts and many release proteolytic enzymes....
Resource Type:: Dissertation

Risk factors associated with predicting involuntary weight loss among elderly nursing home residents

Creator:: Satheannoppakao, Warapone
Abstract:: The purposes of this study were to investigate patterns and causes of weight loss among elderly long-term care residents and to examine the relationship between weight changes and the nursing home survival. The study was designed to accomplish five objectives: 1) to examine the rate and degree of the first...
Resource Type:: Dissertation

Studies on isoprenoid biosynthesis in Euglena gracilis

Creator:: Kim, Dojung
Abstract:: This dissertation describes studies of isoprenoid biosynthesis in the phytoflagellate Euglena gracilis. Elucidation of a novel isoprerioid pathway, the 2-Cmethyl-D-erythritol-4-phosphate (MEP) pathway, in addition to the generally known mevalonate (MVA) pathway, led to extensive exploration of the distribution of both pathways in a variety of organisms. To date, photosynthetic eukaryotes...
Resource Type:: Dissertation

Transcriptional repression mediated by a novel family of C₂H₂ zinc finger proteins

Creator:: Senawong, Thanaset
Abstract:: Two novel and highly related C₂H₂ zinc finger proteins (CTIP1/BCL11A/EVI9 and CTIP2/BCL11B/Rit1) have been implicated in COUP-TF signaling, etiology of myeloid and lymphoid malignancies, and hematopoietic cell development. However, the precise cellular function(s) and the contribution of these proteins to neoplastic processes and hematopoietic cell development remain unknown. The goal...
Resource Type:: Dissertation

Bone gains in adolescent athletes and non-athletes

Creator:: Rinder, Todd Anthony
Abstract:: Discordance in bone mass between young adult swimmers and soccer players may be a direct result of differences in bone loading patterns that influence bone mineralization during growth. Our aim was to evaluate whether sports participation (soccer and swimming) had an independent effect on bone mass accrual at the hip...
Resource Type:: Dissertation

An artificial neural network approach to laser-based direct part marking of data matrix symbols

Creator:: Jangsombatsiri, Witaya
Abstract:: Certain applications have recently appeared in industry where a traditional bar code printed on a label will not survive because the item to be tracked has to be exposed to harsh environments. Laser direct-part marking is a manufacturing process used to create permanent marks on a substrate that could help...
Resource Type:: Dissertation

Syntheses and evaluation of putative enzyme inhibitor of isoprenoid biosynthesis

Creator:: Phaosiri, Chanokporn
Abstract:: The discovery of the methylerythritol phosphate pathway (the MEP pathway) as an alternate pathway for isoprenoid biosynthesis in some organisms including most bacteria, malarial parasites and plants, but not in animals, has stimulated extensive studies in this area. Research has revealed the potential of finding novel antibacterials, antimalarial drugs, and...
Resource Type:: Dissertation

Wavelet analysis : linking multi-scalar pattern detection to ecological monitoring

Creator:: Anthony, Jill Ada Marie
Abstract:: Wavelet analysis is an analytical and modeling tool for optimizing sampling efficiency and accuracy, particularly in the context of designing long-term, large-scale monitoring plans. As a pattern analysis method that accommodates and preserves non-stationarity, wavelet analysis provides novel visualization and analytical capabilities for increased insight into interactions between multi-scalar heterogeneous...
Resource Type:: Dissertation

Individual and population responses to abiotic stresses in Italian ryegrass (Lolium multiflorum Lam.)

Creator:: Martinez-Ghersa, Maria Alejandra
Abstract:: Plant form is a compromise between resource gathering, reproduction and the tolerance to physical demands of the abiotic and biotic environment. In an agricultural field in addition to the natural factors causing stress, humans also introduce physical and mechanical stresses, and chemical pesticides into the environment. Many of these factors...
Resource Type:: Dissertation

Perceptions of community hospital physicians on computerized physician order entry

Creator:: Churchill, Brian E.
Abstract:: Objectives: To identify the perceptions of community hospital physicians on computerized physician order entry. Design: Multi-method approach consisting of a mail survey of 659 community hospital physicians with active admitting privileges at three PeaceHealth, Inc., along with follow-up personal interviews with stratified random selection from completed survey. Measurements: Perceptions were...
Resource Type:: Dissertation

Magnetically assisted liquid-solid fluidization in a gradient magnetic field : Theory and application

Creator:: Sornchamni, Thana
Abstract:: Development of efficient methods for the destruction of solid wastes and recovery of valuable resources is needed to support long-duration manned missions in space. In particular, these technologies are required for deployment in hypogravity and microgravity environments, such as at the lunar or Martian surfaces. Gradient Magnetically Assisted Fluidized Bed...
Resource Type:: Dissertation

Leaving home for the streets : voices of youth from Ghana's streets

Creator:: Amantana, Vivian
Abstract:: Homelessness is a social concern worldwide. In Ghana, homelessness among the youth comes as a result of several factors, the major one being rural-urban migration. Rural-Urban drift is impelled by several factors ranging from perceptions of economic opportunities in urban areas, to increasing rejection of aberrant traditional practices such as...
Resource Type:: Dissertation

Immobilization of hen egg white lysozyme by the sole histidine residue to polystyrene beads through peptide spacers

Creator:: Wu, Yawen
Abstract:: Lysozyme is a natural antimicrobial agent that is effective against many food spoilage and pathogenic microorganisms by disintegrating their cell walls. Immobilization of lysozyme has attractive applications for use in the food industry: (1) The enzyme could be readily separated from treated foods and beverages and re-used while the foods...
Resource Type:: Dissertation

Hillslope hydrology : from patterns to processes

Creator:: Tromp-van Meerveld, Hilda J.
Abstract:: This dissertation re-examines the now standard perceptual model of hillslope hydrological response to rainfall, which includes the growth of a saturated wedge at the soil-bedrock interface or impeding layer. It also challenges the notion of bedrock impermeability and the assumption that the pattern of subsurface stormflow is determined by the...
Resource Type:: Dissertation

Molecular characterization of criniviruses and ilarviruses infecting strawberry

Creator:: Tzanetakis, Ioannis E.
Abstract:: Pallidosis is a disease of strawberry identified in 1957 with an unknown etiology. Two previously uncharacterized viruses in strawberry, Strawberry pallidosis associated virus (SPaV) and Beet pseudo-yellows virus (BPYV), have been found associated with disease symptoms. The complete nucleotide sequence of both viruses was determined and molecular detection protocols developed....
Resource Type:: Dissertation

College algebra students' understanding and algebraic thinking and reasoning with functions

Creator:: Nilklad, Lakana
Abstract:: The purpose of study was to investigate college algebra students' understanding of function concepts. In addition, their solution strategies and algebraic thinking and reasoning were explored. Twenty-four volunteer students from one college algebra recitation class participated in the study to access their understanding of functions. Five out of 24 volunteer...
Resource Type:: Dissertation

Middle school students' mathematical dispositions in a problem-based classroom

Creator:: Katwibun, Duanghathai
Abstract:: The purpose of this study was to describe middle school students' mathematical dispositions in a problem-based learning [PBL] classroom. Eight volunteer students from one 6th grade mathematics classroom participated in this study. The curriculum used was the Connected Mathematics Project [CMP]. The main sources for data collection were classroom observations,...
Resource Type:: Dissertation

Inhibition of exercise-induced oxidative stress, inflammation and muscle damage by prior supplementation with the antioxidant vitamins E and C

Creator:: Mastaloudis, Angela
Abstract:: To determine if 6 weeks prior supplementation with vitamins E and C could alleviate exercise-induced DNA damage, prevent lipid peroxidation and inflammation, slow the rate of vitamin E utilization and/or attenuate muscle damage, 22 subjects (11 females: 11 males) were studied during a 50 km (32 mile) ultramarathon. Subjects were...
Resource Type:: Dissertation

A multi-case study of elementary classroom teachers' transitions to reform-based mathematics instruction

Creator:: White, Elizabeth Busch
Abstract:: The National Council of Teachers of Mathematics published their vision of active, problem-centered instruction with a goal of conceptual understanding in 1989. Fifteen years after these reforms were proposed the changes are reflected in school policy and elementary mathematics curriculum, but only limited change has actually occurred in classroom instruction....
Resource Type:: Dissertation

Recordando memoria : shaping Chicana identity

Creator:: Martinez, Yolanda Tellez
Abstract:: This research explored the self-concept of Chicanas in terms of their lived experiences and how those experiences influenced the shaping of their identity. It examined the multiple labels Chicanas use to self-identify and the context or situations in which they use specific labels. Moreover, it took into account the influence...
Resource Type:: Dissertation

Geographic variation in genetic and meristic characters of coastal cutthroat trout (Oncorhynchus clarki clarki)

Creator:: Williams, Thomas Herbert
Abstract:: Understanding how populations within a species interact across various geographic and temporal scales is fundamental to developing appropriate conservation strategies. I examined the geographic variation in genetic and meristic characters of coastal cutthroat trout (Oncorhynchus clarki clarki) based on approximately 1,400 fish sampled from 54 populations spanning their distributional range...
Resource Type:: Dissertation

Influence of cultivar and maturity on blackberry polyphenolics and investigation of sediment formation in blackberry juice

Creator:: Siriwoharn, Thanyaporn
Abstract:: The influence of cultivar and maturity on polyphenolic composition and antioxidant activity was investigated by UV-Visible spectrophotometry and analytical high performance liquid chromatography (HPLC) in commercially important blackberry cultivars and selections. The anthocyanin pigments changed tremendously with ripening. Total anthocyanins increased from 74.7-317 mg/100g fw from underripe to over ripe...
Resource Type:: Dissertation

Pre-service grief and loss preparation in CACREP accredited school counseling programs

Creator:: Low, Lori L.
Abstract:: Youth today experience high degrees of loss and change, resulting in grief (Goldman, 2001). Little evidence exists of school counselors' academic preparation in grief counseling. The purpose of this research study was to determine how CACREP school counseling programs prepare school counselors in the areas of grief and loss, including...
Resource Type:: Dissertation

A formative evaluation of pre-service preparation of substance abuse counseling in CACREP accredited school counseling programs

Creator:: Biles, Kathy E.
Abstract:: Substance abuse is a prevalent occurrence among adolescents. A review of the literature revealed that adolescent substance abuse has a strong connection to their academic performance. School counselors address adolescents' academic and personal/social needs by providing services through prevention education, responsive services, and collaboration with community members. Yet, there is...
Resource Type:: Dissertation

Nitrogen, defoliation and new growth in almond (Prunus dulcis (Mill) D.A. Webb) nursery plants

Creator:: Bi, Guihong
Abstract:: The relationships between nitrogen (N), defoliation, and plant growth in nursery plants were studied using almond {Prunus dulcis (Mill) D. A. Webb) trees. In several experiments the effects of N source and availability on tree growth, N uptake, N remobilization, and nonstructural carbohydrates (TNC) were investigated to determine the most...
Resource Type:: Dissertation

Three essays on nonparametric and semiparametric regression models

Creator:: Yao, Feng
Abstract:: This dissertation contains three essays on nonprametric and semiparametric regression mod- In the first essay, we propose an estimation procedure for value at risk (VaR) and expected shortfall (TailVaR.) for conditional distributions of a time series of returns on a financial asset. Our approach combines a local polynomial estimator of...
Resource Type:: Dissertation

The first year of teaching secondary agricultural education : a national study

Creator:: Warnick, Brian K.
Abstract:: The purpose of this study was to describe the perceptions of the first year experience of teaching secondary agriculture and to explore the relationships between these perceptions, the characteristics of beginning agriculture teachers, and the types of support provided to beginning teachers. An additional focus of the study was to...
Resource Type:: Dissertation

Economic analysis of restoration practices to improve water quality and fish habitat of a large river floodplain : a case study of the Willamette River, Oregon

Creator:: Seedang, Saichon
Abstract:: In- stream water temperature is one of the most important environmental factors associated with the decline in salmonid populations and their habitats in the Pacific Northwest. Most ecological restoration practices that attempt to reduce instream temperatures center on replanting or reestablishing riparian vegetation and increasing flows. However, in a large...
Resource Type:: Dissertation

The language of mathematics : a functional definition and the development of an instrument of measure teacher perceived self-efficacy

Creator:: Gray, Virginia
Abstract:: Mathematics is permeated with language; it appears in the form of new words and some old words with new meanings. There are new symbols to be able to read and consume; much information is presented in tabular or graphic form, and finally the language in a mathematics class has its...
Resource Type:: Dissertation

Land treatment system design with system parameter optimization support model

Creator:: Hagimoto, Yutaka
Abstract:: Increasing costs for wastewater treatment provide incentives to evaluate system alternatives, especially among small communities with limited financial resources. Land treatment systems with hybrid poplar tree plantations are becoming increasingly popular as one such alternative in the Pacific Northwest. Land treatment systems are made up of a complex dual system:...
Resource Type:: Dissertation

Systematics, phylogeny, and ecology of Gomphus sensu lato

Creator:: Giachini, Admir J.
Abstract:: The nomenclatural history of Gomphus sensu lato began with Persoon in 1797. Over 200 years species of Gomphus sensu lato have been variously classified also under Cantharellus, Craterellus, Chloroneuron, Chlorophyllum, Gloeocantharellus, Nevrophyllum, and Turbinellus. Species of Gomphus sensu lato have been historically characterized as having aboveground fruiting, fleshy basidiomata with...
Resource Type:: Dissertation

Development and in vivo testing of novel hydrochlorothiazide gastric retention formulations in healthy volunteers and stage I hypertensive patients

Creator:: Farid, Samar Farghali
Abstract:: This thesis describes in vitro and in vivo evaluation of a gastric retention formulation (GRF) developed at Oregon State University. The formulation was prepared from xanthan gum and locust bean gum as gelling agents and other formulation ingredients were added, then it was originally vacuum oven dried. The effect of...
Resource Type:: Dissertation

Impacts of ponderosa pine forest restoration treatments on the ectomycorrhizal fungal community and fine root biomass in the Blue Mountains of Oregon

Creator:: Smith, Jane E. (Jane Elizabeth)
Abstract:: Before the arrival of Euro-Americans, the inland Pacific Northwest was settled by native people whose frequent intentional burning of the landscape promoted open stands dominated by large fire-resistant ponderosa pine. Fire suppression for nearly a century, livestock grazing, and logging of the largest trees has resulted in forests characterized by...
Resource Type:: Dissertation

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