A survey of Oregon sheep producers conducted as part of this research, indicated that lambing losses by sheepgrowers in winter rainfall areas of Oregon currently average 16 percent. The majority of the lambs born in these areas are born in pastures without the benefit of shelter. The utilization of portable...
A computer simulation program, Controlled Atmosphere Simulation (CAS), was written in Microsoft Visual Basic 3.0, Professional Edition to evaluate energy use by three type of atmosphere generators used in fruit storage warehouses. The program consists of pulldown time and energy use models for a membrane air separator, an ammonia fractionating...
A two year experiment demonstrated electrical energy savings
through evaporator fan cycling in part of a full-sized refrigerated
controlled atmosphere apple storage facility in Yakima, Washington.
Room cooling demand and evaporator fan operation was controlled by
the bulk fruit temperature. Refrigerant temperature was regulated
by a computer controlled ramping sequence...
A water-to-water heat pump was specifically designed and operated
to temper process water for cleansing and sanitizing milking parlor
equipment using recovered energy from the milk refrigeration system as
its heat source. Operation of the water-to-water heat pump in series
with the energy recovery system was found to be both...
The goal of this research was to determine if controlled atmosphere (CA) storage could be used to extend the market period of fresh Pacific Northwest blueberries and to evaluate the effects different storage atmospheres have on fruit quality. Furthermore, this research also investigated heat and mass transfer characteristics during cooling...
Moisture loss from fresh fruits results in lost revenue to producers, storage/packing companies, distributors, and increased prices for the consumer. Improved methods of storage and handling are necessary to help prevent moisture loss and retard spoilage. A literature review was conducted to improve knowledge on past and current studies involving...
Summer brooding often requires some form of air modification in
addition to maximizing ventilation rate to prevent animal heat stress
and possible death due to hyperthermia. A rockbed thermal storage
module was designed and constructed to provide sensibly cooled air
for a broiler space under summer brooding conditions. A mathematical...
Increased consumer demand for fresh fruit throughout
the year has created a need for long term storage. Long
term storage of fruit uses more energy than fresh market
products, thus increasing production cost. Pacific
Northwest energy costs and more competition for markets
has made energy conservation an important factor to...
Conversion of solar energy to mechanical power through the use of
thermostatic bimetals and linear Fresnel lenses was found to be both
theoretically and experimentally feasible. Using linear Fresnel lenses
to concentrate sunlight on bimetallic coils caused a simple sun powered
motor to produce rotational shaft power. However, continuous rotational...
A dynamic propagation of a finite crack of opening
mode in a micropolar elastic solid was investigated.
By using an integral transform method, a pair of twodimensional
singular integral equations governing
stress and couple stress was formulated in terms of the
displacement transverse to the crack, macro- and microrotations,
and...
Published June 1981. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Published July 1983. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Hybrids with abnormal development were obtained when particular
genotypes of Phaseolus vulgaris L. were crossed. The phenotypic
aberrations of the F₁s included retarded growth, chlorosis of the
trifoliate leaves and the formation of adventitious roots on the
hypocotyls. The expression of the abnormalities was dependent on the
temperature. At high...
In a story of his life Les reflects on what he
has gained and what he has lost while seeking success in
the moving and shifting of military and academic life
through homes and schools all over the United States.
He describes himself as between races, languages, and
cultures.
This study examines the interactions between the scientific communities of the
Lawrence Berkeley Laboratory (LBL) and the Stanford Linear Accelerator Center
(SLAC) in the discovery of the tau lepton by physicist Martin Perl between 1973-
1977. Perl became interested in searching for heavy leptons through positron-electron
collision experiments using the...
The United States is the third-largest producer of raspberries in the world. Washington
State leads the nation in red raspberry (Rubus idaeus L.) production. 'Meeker', the
most grown red raspberry cultivar in the Pacific Northwest (Washington, Oregon and
British Columbia, Canada) is highly susceptible to Raspberry crumbly fruit, a virusinduced...
The Pacific Northwest (Oregon and Washington in the United States and British Columbia in Canada) is one of the major producers of red raspberry (Rubus idaeus L.) and blueberry (Vaccinium corymbosum L.) in the world. The expansion of growing area with these crops has resulted in the emergence of new...
Cell-to-cell communication by chemical signals, termed quorum sensing (QS), is a common regulatory scheme in the microbial world. Pseudomonas aeruginosa¸ an opportunistic pathogen of burn wounds and cystic fibrosis lungs, uses QS to control the expression of hundreds of genes, particularly those necessary for population level benefits such as biofilm...
Social behavior leading to the production of common goods is prone to exploitation. One such behavior in Pseudomonas aeruginosa is quorum sensing (QS), by which the bacteria produce signals to regulate extracellular common goods. Exploitation comes in the form of cheaters which have a mutation in the central quorum sensing...
Cell-cell communication in bacteria is understood to facilitate the coordination of population-wide cooperative behavior in the form of concerted gene expression. The opportunistic pathogen Pseudomonas aeruginosa uses such a communication mechanism to regulate a large group of genes important to virulence strategies in this bacterium. This general mechanism of communication...
In June 1988 the Japanese agreed to liberalize their
beef market which had been protected by an import quota
system for twenty-four years. The purpose of this thesis is
to draw conclusions/implications concerning the effect of
the trade agreement (1988 Import Quota Removal Agreement)
upon Japanese beef imports and the...
Research was conducted at the Starkey Experimental Forest and
Range in northeastern Oregon to determine cattle performance, diet
quality, botanical composition of forage ingested, and production
and utilization among rest-rotation, season-long, and deferred
rotation grazing systems. The grazing season lasted from June 20 to
October 10 of each year. Cows...
Declines in Greater Sage-Grouse (Centrocercus urophasianus, hereafter sage-grouse) populations could be attributed to low chick survival, which may be influenced by the availability of food and cover at sites used by females rearing broods. Habitat attributes important to broods may vary regionally; thus, it is necessary to understand factors affecting...
The western purple martin (Progne subis arboricola) is a species of conservation concern throughout the Pacific Northwest. In western Oregon, the purple martin nests in three major ecosystem types: inland open-water, coastal, and upland forest. The availability of suitable breeding habitat is a major limiting factor for western purple martin...
Research on grief has been studied for nearly a century to understand its many facets, expressiveness, and timing. In the field of counseling, many changes in theories, models, and the lenses through which loss is responded to have been accomplished. However, one constant in the U.S. culture is that definitions...
The purpose of this study of the life and career of Dr. Carl
Leonard Anderson was to recount his professional contributions to
the field of health and relate these to public health and health education. The major emphasis of this study concerned Dr. Anderson's
professional life.
The accomplishment of the...
Software maintenance accounts for a large portion of the software development cost, particularly the process of updating programs either to adapt for requirement change or to enhance design or efficiency. Currently, program updates are generally performed manually by programmers using text editors. This is an unreliable
method because syntax and...
Research was conducted on the Keating rangelands in north-eastern Oregon to determine the food habits of deer and cattle and
similarity of their diets, and to estimate deer and cattle months of
grazing on both a quantitative and nutritional basis. Data were
collected during the winters of 1978-1979, 1979-1980 and...
Correctness and efficiency are important properties of programs. However, to support maintenance and debugging, the programs should also be understandable. Program explanations also play a vital role in educational settings, enhancing the understanding of programs among students.
Proof trees provide a sound basis for generating dynamic explanations of programs. But...
Two management systems were evaluated in terms of the effects on
cow condition score and body weight changes and calf growth rates. The
management systems evaluated were winter supplementation of energy,
winter creep feeding and delayed weaning. The calves used in this study
were born in September and October of...
When iron levels are low, the opportunistic pathogen Pseudomonas aeruginosa secretes the high-affinity iron-binding siderophore pyoverdine. The cognate ferripyoverdine receptor, FpvA, has gained attention as the most divergent gene in the organism’s genome, showing substantial evidence of positive selection. S-type pyocins, bacteriocins with specificity to Pseudomonads, enter cells through FpvA...
The study of variational typing originated from the problem of type inference for variational programs, which encode numerous different but related plain programs. In this dissertation, I present a sound and complete type inference algorithm for inferring types of all plain programs encoded in variational programs. The proposed algorithm runs...
While the quorum-sensing (QS) diversity of the opportunistic pathogen Pseudomonas aeruginosa has been well established in cystic fibrosis (CF) lung infections and in vitro experiments, little is known about its QS-diversity in natural environments. One significant QS-deficient behavior is social cheating. Social cheaters contain mutations that prevent them from producing...
Pseudomonas aeruginosa is an opportunistic human pathogen that infects immunocompromised individuals such as those suffering from burns or the genetic disorder cystic fibrosis. This organism utilizes a cell-cell communication mechanism known as quorum sensing (QS) to coordinate virulence gene expression and biofilm formation. It has three interconnected QS systems, namely...
In an increasingly computation-driven world, algorithms and mathematical models significantly impact decision making across various fields. To foster trust and understanding, it is crucial to provide users with clear and concise explanations of the reasoning behind the results produced by computational tools, especially when recommendations appear counterintuitive. Legal frameworks in...
Cooperative behaviors in bacteria are increasingly appreciated for their relevance to microbial ecology and utility as model systems for social evolution. One example is the secretion of siderophores, a structurally diverse group of compounds that chelate extracellular iron. Siderophore production is considered cooperative because the benefits can be shared with...
The history of a software project plays a vital role in the software development process. Version control systems enable users of a software repository to look at the evolution of the source code, and see the changes that led to newer versions. Currently, version control systems provide commands that can...
The code reuse problem is a common software engineering problem in scientific computing. As a prevailing programming language in many scientific fields, Fortran does not provide support to address this problem. One particular reason is that Fortran lacks the support for generic programming. By applying program-generation techniques, we developed two...
Variability is an important and widely studied topic across domains such as version control, software product lines, and metaprogramming. This dissertation presents an investigation into the process of systematically adding variability to data structures and programs, leading to guidelines for variational data structures and implications for programs that create, manipulate,...
Landscape models for elk distribution developed at Starkey Experimental Forest and Range from 1993-1995 were tested on another landscape during 2003-2005 at Sled Springs Wildlife Demonstration Area. Using location data obtained from 23 wild elk captured and fitted with GPS telemetry collars, 8 spatial resource selection function models representing 8...
The quorum sensing regulatory pathway has been extensively studied for its impact on the virulence of Pseudomonas aeruginosa, an opportunistic pathogen that causes acute and chronic infections in immunocompromised individuals such as those suffering from the genetic disorder cystic fibrosis. Part of the quorum sensing pathway that has not been...
Pseudomonas aeruginosa is a ubiquitous environmental microbe, opportunistic pathogen, and a highly social organism. P. aeruginosa utilizes a wide array of cooperative behaviors to adapt to the environmental conditions around it. These behaviors include quorum sensing (QS), a form a cell-to-cell signaling that coordinates the expression of secreted products in...
BoGL is a programming language created for the purpose of computer science education that is specific to the domain of board games. Although there is a language grammar and an existing implementation that is currently used by students, a complete and formal language standard does not yet exist. In the...
Spreadsheets are a pervasive technology throughout personal and industrial use. Often times, the user is not the author, contributing to a lack of understanding of the purpose and functionality of a spreadsheet. Furthermore, the lack of understanding is a major reason for mistakes in the use and maintenance of spreadsheets....
Two studies were conducted to determine the factors influencing distribution of cattle on northeastern Oregon mixed-conifer forested rangelands. The objective of the first study was the quantification of differences in distribution of cattle of different ages. Beginning in 1991, and continuing through 2001, radio telemetry collars were placed on a...
Pseudomonas aeruginosa is a ubiquitous gram-negative bacterium that is capable of causing infections in people who are immune compromised. The bacterium can live in a variety of environments due to the variety of virulence factors it can produce. It is well adapted to living in iron-stringent conditions because it can...
We demonstrate an approach to transform keyword queries automatically into queries that combine keywords appropriately by boolean operations, such as and and or. Most current search engines will preprocess the queries before they really use these queries to search locally stored files or web pages. However, the search engines usually...
Five simulated precipitation patterns characteristic of the Columbia
Basin and Plateau region and six fertilization rates were evaluated
for their effect on percent crude protein, percent in vitro dry matter
digestibility, fiber content, and yield of wheat aftermath on a commercial
farm in north central Oregon.
The higher moisture regimes...
As XML becomes more and more popular, easy-to-use and powerful XML query languages are in great need. Xing is a visual query and restructuring language for XML documents. The objective of this project is to develop a basic version of Xing, including a user-oriented XML query interface and a simple...
In this thesis I present the choice calculus, a formal language for representing variation in software and other structured artifacts. The choice calculus is intended to support variation research in a way similar to the lambda calculus in programming language research. Specifically, it provides a simple formal basis for presenting,...
Pseudomonas aeruginosa is an environmental bacterium as well as an opportunistic pathogen that primarily infects immunocompromised individuals, including those suffering from cystic fibrosis. The density-dependent regulation of gene expression via cell-to-cell communication, also termed quorum sensing (QS), is an important virulence determinant in this organism. Generally, P. aeruginosa uses three...
:
_____________________________________________________________________
Martin Schuster
Pseudomonas aeruginosa is an environmental bacterium as well as an
Partial programming is a field of study where users specify an outline or skeleton of a program, but leave various parts undefined. The undefined parts are then completed by an external mechanism to form a complete program. Adaptation-Based Programming (ABP) is a method of partial programming that utilizes techniques from...
An interdisciplinary study into the theory of design decisions has yielded a model for tracking design changes in hardware/software systems, but it still needs to be applied to a larger system to test its efficiency at tracking important data. This thesis creates an implementation of PLEXIL, a language in development...
Over the last several decades, there has been a marked increase in the amount of science outreach to the public with little attention paid to how scientists who conduct outreach perceive learning and how that applies to their outreach activities. This increase in outreach efforts is linked to the National...
Functional programming is concerned with referential transparency, that is, given a certain function and its parameter, that the result will always be the same. However, it seems that this is violated in applications involving uncertainty, such as rolling a dice. This thesis defines the background of probabilistic programming and domain-specific...
Teaching CS is a challenging task, especially for those without prior programming experience. Even for veteran educators, having to learn CS concepts while also trying to teach those same concepts is difficult; as is the case for many K-12 CS instructors. Unfortunately, there is often no formalized order with CS...
We present the evolution of a reasoning system for inferring dimension information in
spreadsheets. The three papers included in this thesis show how the initial system can be
used to check the consistency of spreadsheet formulas and thus is able to detect errors in
spreadsheets, and the evolution to a...
The opportunistic pathogen Pseudomonas aeruginosa possesses two LuxR-LuxI
type quorum-sensing systems that use diffusible acyl-homoserine lactone molecules to
autoinduce and coordinate expression of multiple virulence factors. We conducted a highthroughput
screen for mutants deficient in skim-milk proteolysis—a quorum-sensing
dependent phenotype—using a nonredundant transposon-insertion library representing
most nonessential genes in P....
Ubiquitous pathogen Pseudomonas aeruginosa coordinates population-wide activation of virulence genes through quorum sensing (QS), where individuals transition from solo to social behaviors to benefit the population. QS is complex and mechanisms vary from species to species, but the concept is common to the bacterial world and has implications in various...
In a process called quorum sensing (QS), the bacterial pathogen Pseudomonas aeruginosa uses small diffusible signals to coordinate cooperative behaviors via secreted “public goods”. Under QS-dependent growth conditions, social cheaters arise with mutations in lasR, the gene for the primary QS signal receptor. These cheaters do not produce public goods....
Spreadsheets are among the most widely used end-user programming systems. Unfortunately, there is a high incidence of errors in end-user spreadsheets, and some of these errors have high impact. In this dissertation, we describe techniques we have developed to help end users develop safer spreadsheets. As part of our research,...
The problem of supporting more advanced selective undo operations has received a lot of attention. However, selective undo is generally missing in commonly used editors. Moreover, partial selective undo, the ability of undoing just part of some edit so that other edits may be undone, is not supported at all....
Experimental game theory is the use of game theoretic abstractions—games, players, and strategies—in experiments and simulations. It is often used in cases where traditional, analytical game theory fails or is difficult to apply. This thesis collects three previously published papers that provide domain-specific language (DSL) support for defining and executing...
XML is a very versatile data format that has been used to represent many different kinds of data, including web pages, books, business and accounting data, programming interfaces, vector graphics, system logs, and games. In a short span of time, it has gained wide acceptance as the document and data...
The use of board games for teaching introductory computer science is a promising recent avenue of research. The goal is to introduce computing concepts through their use in the implementations of simple games, thereby keeping students engaged through their learning process. However, there is a gap between students' algorithmic descriptions...
In a software development cycle, programs go through many iterations. Identifying and
understanding program changes is a tedious but necessary task for programmers, especially when
software is developed in a collaborative environment. Existing tools used by the programmers
either lack in finding the structural differences, or report the differences as...
Martin Buber was an internationally known scholar,
teacher, and author whose works covered education, communication,
politics, theology, philosophy, counseling,
and related fields. The purpose of this study was to
discover the implications of Buber's philosophy of education
for the student services profession. Previous
attempts to relate Martin Buber's philosophy to...
This dissertation explores the structural dynamics of human understanding and particularly the concept of meaning and its connections to concepts of ultimate ground, necessity and contingency, language, and perception. It focuses on the history of the concept of meaning in early twentieth-century European physics and philosophy, through an analysis of...
L. C. Dunn (1893-1974) spent most of his scientific career conducting research in
developmental genetics as a member of the Zoology Department at Columbia
University in the City of New York. He had an accomplished scientific career
researching mutations in mice, which earned him respect from other geneticists and
scientists....
Dedicated to the preservation and promotion of many of the nation’s most threatened and endangered species, the W.L. Finley National Wildlife Refuge is highly invested in the management of some of the last remaining upland prairies once prevalent throughout Oregon's Willamette Valley. More than a century of land fragmentation, fire...
_____________________________________________________________________
AN ABSTRACT OF THE THESIS OF
Jona L. Ensley for the degree of Master of Science in
In January 1970, collections of Serpula vermicularis L. were
obtained from Bray Point, Oregon, for the purpose of determining the
effect of acclimation to salinity and temperature on its rate of
respiration. The worms were removed from their tubes and acclimated to one of three salinities (28.8%₀, 31.1%₀, or 35.9%₀)...
Much has been written concerning the establishment and improvement
of the athletic program in large high schools. However, much of that
which is applicable to large high schools is not applicable to the smaller
institutions.
The chief purposes of this study were to explore the athletic equipment
problems of the...
The Purpose of the Study: The major purpose of this study was to determine if there were differences among the opinions of participating employers, previous participating employers, and non- participating employers concerning cooperative vocational education,. The hypothesis that there is no significant difference among the mean scores for the three...
The study was undertaken to determine
1) The types, numbers and status (previously owned
or newly purchased) of the household furnishings
2) The types and amounts of selected personal
belongings
3) Adequacy of storage space provided
4) Selected activity patterns
of a specific group of retired women living in one...
A cultivar comparison study was conducted to identify similarities
and differences in cane characteristics between 2 primocane fruiting
red raspberry cultivars and to determine if the differences and
similarities can help determine cultural practices that may improve
productivity. The comparison of the cultivars 'Amity1 and 'August
Red' showed a difference...
Two experiments were conducted to investigate the effects of
gonadotropin-releasing hormone (GnRH), administered twice during
the same estrous cycle, on bovine luteal function. Eight mature
beef cows, each cow serving as her own control, were injected
intravenously (i.v.) with saline on days 2 and 8 of the cycle (day of...
As a young adult, I have been able to witness first hand just how drastically social media is changing our culture and the way that we look at things. As social media continues to become more vastly used by its members who are in many different phases of life and...
A growing concern among the international community is that civil war has become the most common form of armed conflict worldwide. To prevent further bloodshed, more research is urgently needed to understand the causes of conflict and most successful strategies for peace. The bargaining theory of war proposes that former...
The paper analyzes the relative performance of two market-based fisheries management instruments in the presence of a stochastic stock-recruitment relation. Regulators are forced to choose either a fee per fish landed or a quota on the total fish harvest at a time when they are uncertain what will be...
This project provides insight on the current state of forest management policy, as it relates to climate change in the United States. It analyzes the current statutory framework that governs the management of National Forests and administrative Executive Orders that can determine federal agency direction. A comparative analysis is conducted...
The cytolytic properties of the mosquitocidal 25 Kd protein deltaendotoxin of Bacillus thuringiensis subsp. israelensis (Bti) was studied using the human erythrocyte as a target cell. Both a fixedtime and a kinetic hemolytic bioassay were developed in order to screen a variety of treatments for their influence on the toxinerythrocyte...
A heuristic is developed to plan loads for containerized cargo ships. It is designed to serve a port which uses gantry cranes (transtainers) and trucks to handle containers. The model recognizes constraints on ship stability, placing containers in a bay with the proper length, placing refrigerated cargo near electrical outlets,...
The project of which this research was a part is designed to
provide an improved system of ecological resource analysis. Specific
objectives of this study were: (1) classification of plant communities
on the fringes of the sagebrush steppes and the salt desert of
southeastern Oregon, (2) development of symbolic and...
To determine the effects of rate of nitrogen application and storage time on fruit quality of highbush blueberries (Vaccinium corymbosum, L.), five rates of ammonium sulfate fertilizer were soil-applied in 1984 and 1985 to cvs. Bluecrop and Jersey. Fruit was harvested up to three times during the 1985 season and...
There is a significant amount of research analyzing the effect of race, gender, and other common demographical data on student interest and performance in computer science. However, there is relatively little research concerning less common demographic populations, such as introverts, artistic students, and visual learners. This study investigates if these...
The Remember Center (TRC) is a long term care center for previously trafficked children. In Ghana, there is a huge child trafficking problem because of the impoverished state the country is in and the lack of involvement from the government. With the fishing industry depleting because Lake Volta is running...
Raspberries are an important commodity worldwide, with the United States (U.S.) leading fourth in global production in 2017. An important factor when shipping propagated Rubus across the globe is the security of clean plant material verified through pathogen detection methods which is vital in preventing disease spread. A raspberry virus...