This study of Oregon secondary school teachers was designed
to find why individuals had chosen this particular career, what
they think of their positions, what time of their lives they chose
teaching as a career, and what their career plans are for the
future. The respondents were full-time Oregon secondary...
Improving crop cultivars for use on organic farms is pertinent, as current elite germplasm is less resilient within the more variable context of organic farm environments. Although a growing number of studies have focused on organic plant breeding in cereal crops, very few have focused on vegetable crops, especially those...
This is a Ph.D. dissertation for a study conducted at OSU/Horticulture. The main objective of this study was dissecting the genetic background for white mold resistance in common (snap) bean. Tow main approaches were followed to achieve the goal. The first approach was using the classical quantitative trait loci (QTL)...
This dissertation aims to elicit how a neo-colonial context shapes maternal and infant heath (MIH) outcomes by describing how they are socially, politically, historically, and culturally produced. Using a multi-level critical biocultural, medical anthropological research approach, the purpose of this research was to investigate maternal stress in the United States...
The purpose of this study was to investigate the relationships
between fashion innovativeness, fashion opinion leadership, attitudes
toward change and socioeconomic level; and to identify the characteristics
of fashion innovators and fashion opinion leaders among Korean
college women living in a transitional society.
Measures selected for this study consisted of...
In this paper we examine some of the developments concerning the Gauss class number problems and build a solid understanding of the class number. First we will develop some background knowledge necessary to understand the problem, specifically the theory of quadratic forms and quadratic fields and how the class number...
Coastal communities rely on the abundant ecosystem services derived from robust conservation areas in offshore marine waters (Campbell, 2019). United Nations member states support the Sustainable Development Goal (SDG) framework, wherein the 14th guideline asserts the importance of life under water. Protected marine environments are critical to the survival of...
Zucchini yellow mosaic virus (ZYMV) is an important disease of Cucurbita worldwide. Resistant cultivars are the best means of control. ZYMV resistance is quantitative in the wild species C. ecuadorensis, and is controlled by at least three genes in tropical C moschata. Very little molecular work has been done in...
This study focused on composition teachers in elementary and
secondary schools who researched their own teaching practices. Specifically, it
examined political implications of their work within the larger context of the
education hierarchy. Central to this examination were teacher-researcher (t-r)
perceptions of and interactions with other members of the education...
Public policy narratives and stories are often referenced by the media, politicians, advocacy groups, and across many disciplines in academia. Studies of social and political narratives support the notion narrative matters, but often lack systematic design capable of producing generalizable findings. The Narrative Policy Framework (NPF) has responded to this...
Overweight and obesity are a growing national concern, particularly among women and selected minority populations (Ayala, Elder, Campbell, Slymen, Roy, Engelberg, et al., 2004; NHANES, 2003). Pregnant women bear a disproportionate risk of becoming overweight or obese (Greene, Smickikias-Wright, Scholl, & Karp, 1988; Gunderson et al., 2000; Rossner, 1999). Although...
The effect of serial (multiple-year) organic matter (OM) amendment on soil properties has been described in some cropping systems, although less is known about the effect of serially amended field soils on soil-borne plant diseases. The objectives of this study were to describe the effects of the third and fourth...
Landfill leachate is a complex wastewater that contains high levels of ammonium (often over 250 ppm) and trace heavy metals (usually under 0.2 ppm). Microalgae have been shown to inexpensively and effectively treat wastewaters containing high loads of organics and nutrients, as well as adsorb metal ions. This thesis focuses...
Wastewater treatment plants around the world are becoming increasingly at risk of sea level rise impacts as these facilities are typically located in low-lying areas to utilize gravity flow for influent (incoming sewage) and effluent (discharged treated sewage). As these risks become realized, treatment plant managers and decision-makers must know...
Halyomorpha halys Stål, brown marmorated stink bug or BMSB, is now present in 43 US states. A native of eastern Asia, this pest can feed on ~200 different plant species damaging bark, leaves, buds, stems, and fruits. Many of these plant species include wild plants, ornamentals, and agricultural crops. BMSB...
Winter squash is an important late winter vegetable crop for local and regional markets; however, farmers in western Oregon report that this crop is marginally profitable due to losses in storage and relatively low yields for the high culinary value kabocha and buttercup types. In order to increase the sales...
The central purposes of this study were to review the
historical sources of David Kolb's formulation of experiential
learning theory, and to determine the effect and
application of Kolb's theory and Learning Style Inventory
as reflected in the literature between 1971 and 1990.
It was found that Kolb based his...
This study was designed to compare two types
process overview displays for a distributed process
control system. The two types of formats included in
the study were an alphanumeric type (letter) and an
analog type (bar). The study required the subjects to
perform check reading and search tasks.
Thirty-six subjects...
The use of municipal refuse (RDF) as fuels has
received widespread attention for reason of its energy
equivalence and the increasing lack of available landfill
sites. The principal obstacle to the construction of combustion
facilities is that RDF produces toxic compounds,
including heavy metals and such organic compounds as PCDD...
Attention has been drawn to the observation that environmental benefits under the current regulatory approaches are diminishing with respect to increased pollution control costs. Regulators have begun to appreciate that while environmental gains can still be achieved under the current command and control system, the most significant environmental gains have...
Increased global competition is forcing organizations to increase their use of group decision making today. Computerized group decision support aids (CGDSAs) are being developed to improve the efficiency of these groups and to improve decision quality. Even though the use of CGDSAs has increased, very little research has been done...
Several studies were conducted to determine if a more consistent
predictor of phytotoxicity to winter oats could be obtained with a
surfactant-herbicide ratio or a per-unit-volume concentration of surfactant,
independent of volume. The herbicides tested were 2,2-dichloropropionic acid (dalapon), 1,1'-dimethyl-4, 4'-bipyridinium
(paraquat), and 3-tert-butyl-5-chloro-6-methyluracil (terbacil) with
the nonionic surfactant X-77...
The effects of ultraviolet (UV) irradiation on photosynthesis and
various partial reactions involving the individual photoreactions of
photosynthesis were examined. These reactions included photo-reduction in adapted green algae, Hill reaction, cyclic photophosphorylation,
the 520 nm absorbance change and variable-yield fluorescence.
The reactions were measured in spinach chloroplasts and
isolated chloroplasts...
Particles generated from wear of prosthesis joint bearing surfaces induce inflammation and promote pathological periprosthetic osteoclast-mediated bone resorption (osteolysis). Obesity increases the risk of prosthesis failure. However, despite being morbidly obese, leptin-deficient ob/ob mice are resistant to osteolysis. These findings suggest that leptin exerts effects that act to increase particle-induced...
A program of research has been established at Oregon State
University to study wood residue combustion using an experimental
spreader-stoker combustor. This research was conducted to increase
the understanding of combustion occurring in wood fired boilers.
Using Douglas Fir screened to 3/8-3/4 inches, two 4x4 factorial
experiments were conducted varying...
This thesis describes investigations of marine algal secondary metabolites, with particular interest in their biomedical and agrichemical potential. Invaluable in such pursuits have been the access and application of advanced spectroscopic techniques, such as NMR, and the ability to assess the biological activity of the algal samples in a variety...
To realize pipelined ADCs in deep-submicron processes, low voltage techniques
must be developed to work around problems created by limited supply voltages such as
the floating switch dead zone, reduced SNR, and reduced OpAmp performance.
This thesis analyzes standard and low voltage design issues for pipelined ADCs
and proposes a...
In the upper estuary of Yaquina Bay, Oregon, there is an annual
population explosion of Acartia tonsa, (Dana) a calanoid copepod,
during the months of July, August and September, followed by a rapid
decline to virtual extinction in November. The restricted estuarine
distribution affords an excellent opportunity to study the...
A decision support system (DSS) incorporating domain
expertise guides, tutors, and consults a decision maker in
opportunity, problem, and crisis identification activities. The
objective for the system is to promote improved decision making.
Using an "Independent Groups" design, an experimental study was
conducted to investigate the effects of DSS use...
Gene regulation is a complex mechanism that controls the spatial and temporal expression of genes in a living cell. My dissertation studies focus on two problems. First, tissue-specific gene expression prediction from DNA sequence and chromatin state, and second, the accurate discovery of small over-represented regulatory circuits in gene regulatory...
In this thesis, I examine the experiences of breastfeeding mothers who chose to give birth with Certified Professional Midwives at a free-standing birth center, and the factors that influence their known high rates of breastfeeding initiation and duration. Using grounded theory and data collected from participant observation, semi-structured interviews, and...
The purpose of this study was to determine the in-service training needs in selected subject matter areas as perceived by community nutrition educators in Kiambu District in Kenya. The study also sought to determine if there were significant relationships between selected demographic characteristics and the respondents' perceptions regarding in-service training...
Although differences between selective pressures in hatcheries
and streams have been theorized to cause genetic divergence between
hatchery and wild salmonids, evidence of this is lacking. This study
was initiated to document the presence or absence of genetic change
in hatchery and wild stocks by characterizing genetic traits in fish...
The consumption of animal-sourced food products by humans is one of the most powerful negative forces affecting the conservation of terrestrial ecosystems and biological diversity. Livestock production is the single largest driver of habitat loss, and both livestock and feedstock production are increasing in developing tropical countries where the majority...
The purpose of this study was to investigate one individual difference,
i.e., rate of response, and the effect on student performance
when teachers recognize this difference. Using disadvantaged third
grade students as subjects, three null hypotheses were formulated as
follows:
1. Slow responding accurate students' (Group LH) scores will
show...
Monilinia vaccinii-corymbosi pseudosclerotia overwinter on the soil surface and produce apothecia in early spring, providing primary inoculum for Mummy Berry Disease of blueberry. Burial under 2.5 cm of soil or the absence of light have previously been identified as critical factors preventing the development of apothecia. Mulches were applied to...
Pseudomonas is a diverse genus of Gamma proteobacteria that are ubiquitous in the natural environment, including soil, water, plant surfaces, and animals. The Pseudomonas fluorescens group is a diverse collection of seven subgroups and more than 50 named species. This group is known for their production of a variety of...
The primary purpose of this study was to test the
conventional view of job factors as satisfiers and
dissatisfiers of members of the National Association of
Directors of Christian Education. The conventional view
stated that all job factors can potentially contribute to
job satisfaction and to job dissatisfaction. A second...
Characterizing special nuclear material (SNM) is critical for nuclear security and non-proliferation. Temporal spectroscopy is a novel and efficient method for characterizing relative material content of special nuclear material. Fission products produced by SNM after being irradiated by a thermal neutron beam can have different half-lives, but can contribute to...
The study of physical activity is important in improving people’s health as it can help people understand the relationship between physical activity and health. Accelerometers, due to its small size, low cost, convenience and its ability to provide objective information about the frequency, intensity, and duration of physical activity, has...
The primary focus of this investigation was to assess whether
or not selected ecological indices and leisure preferences demonstrated
statistically significant relationships with the aged's self-concept.
Gerontology, a relatively embryonic discipline, has only
recently begun to examine the impact of demographic, physical and
socio-psychological stresses upon the geron's self-concept. Even...
Substantial scientific investment has been directed towards understanding factors that influence distribution patterns and animals' remarkable ability for precise orientation and navigation, yet fundamental gaps in our knowledge remain. In my dissertation, I applied emerging genetic technologies to conduct a top-down and bottom-up investigation of animal movement and cue perception....
Coast redwood (Sequoia sempervirens) (D. Don) Endl. is a host for Phytophthora ramorum but it was unclear if the pathogen represents a significant disease risk to this tree species. In this study the susceptibility of coast redwood seedlings and the likelihood of sporulation on redwood were examined. Two methods were...