Electrofishing is a sampling tool commonly used by fisheries researchers. While much is known about the effects of electroshock on fish physiology, consequences to the immune system and disease progression have not received attention. To understand the effects of electroshock on immune function we undertook a comparison of electroshock and...
Although much is known about the effects of electroshock on fish physiology, consequences to the immune system and disease progression have not received attention. Our objectives were to determine the effects of electroshock on selected immune function in juvenile spring chinook salmon Oncorhynchus tshawytscha, the mechanism of any observed alteration,...
The induction of drug-metabolizing enzymes is a
complex biochemical process manifested not only by
increases in various cytochrome P-450 isozymes and
related activities, but also by alterations in
endoplasmic reticulum membranes. Little work has been
done to examine how cytochrome P-450 inducing agents
influence other cellular processes, such as
phospholipid...
The effects of Marine protected areas (MPAs) on adult fish populations depend on the degree of protection provided, which is partly a function of MPA size and the spatial extent of fish movements. The Redfish Rocks Marine Reserve (RRMR) and MPA, located on the south coast of Oregon near Port...
In This Side of Paradise, The Great Gatsby, and several of his short stories, F. Scott Fitzgerald questions the importance of wealth as a factor in supporting happiness and fostering the American Dream on an individual basis. With these texts, Fitzgerald acknowledges that wealth is a factor and, simultaneously, a...
Eight foodborne pathogenic and spoilage Gram-positive bacteria were
evaluated for their spontaneous resistance frequencies to the peptide
antimicrobial nisin. In brain heart infusion (BHI) medium, nisin resistance
frequencies were in the range of l06 to l08 when exposed to nisin at
concentrations 2 to 4 times the minimal inhibitory concentrations....
Social media sources such as Twitter represent a massively distributed social sensor over diverse topics ranging from social and political events to entertainment and sports news. However, due to the overwhelming volume of content, it can be difficult to identify novel and significant content within a broad topic in a...
Over the last decade, the Oregon Department of Fish and Wildlife (ODFW) has documented a precipitous decline in the Crooked River redband trout (Oncorhynchus mykiss) population, prompting this study to address potential factors contributing to the decline. There are two main goals to this project: (1) identify potential factors contributing...
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Scott A. Heppell
Over the last decade, the Oregon Department of Fish and Wildlife (ODFW
Wetland soils with complex stratigraphy and redoximorphic features occur on the
margin of the Willamette Valley, Oregon. In the Jackson-Frazier wetland, vertisols
show three distinct stratigraphic units that rest uncomformably upon each other and
correspond to the Bashaw series Bss, 2Bt and 3BC horizons. Holocene alluvium
deposited as distal alluvial...
On April 1, 1976, Steve Jobs and Steve Wozniak entered into a partnership agreement to found Apple Computer. In the decade that followed, Apple experienced remarkable growth and success, as Jobs catapulted Apple to the Fortune 500 list of top‐flight companies faster than any other company in history. Under direction...
A series of compounds, 7-8 and 20-25, were tested as competitive inhibitors of 2,5-dihydroxyacetanilide epoxidase I (DHAE I) and DHAE II. A Hammett plot was constructed for each enzyme to determine the effect of electron density on inhibition. DHAE I gave a linear, highly correlated plot (r²=0.91) that signifies the...
One of the largest problems facing the forester in the Pacific Northwest today is the economical, rapid rehabilitation of cut-over lands. Many of these cut-over lands are planted to Douglas-fir [Pseudotsuga menziesii (Mirb.) Franco]. Previously, both aerial and spot seeding techniques have been evaluated for their efficiency in Douglas-fir regeneration....
A challenge for municipal authorities of growing urban areas is to provide larger and faster transportation and utility networks that are safe and resilient to significant disruptions after an earthquake event and other disasters. Urban regions, like the San Francisco Bay or the Los Angeles area, are situated in seismically...
Biochar is a highly porous, carbon-rich residue produced by thermochemical conversion (pyrolysis) of plant biomass and carbonaceous organic materials under oxygen-controlled conditions. Chars produced by this process tend to have high ion-exchange capacities and, when added to soil, increase retention of water and nutrients and improve soil aggregation, porosity, and...
The collapse of the I-35W Bridge in Minneapolis, MN in 2007 prompted an investigation into the design and inspection of the steel truss bridges. Further investigation into the collapse revealed that a gusset plate experienced sway buckling, causing the bridge failure. This bridge failure motivated research into the analysis and...
Connectivity of fish populations is a crucial question for fisheries conservation and the development of spatial management plans. Both adult and larval movement define the extent and direction of ecological and evolutionary overlap between geographic regions and, therefore, how we define stocks for management purposes. Within that context, my work...
Recent years have been marked with increasing rates of corporate scandals, environmental disasters, and unfair labor practices, drawing attention to the importance of corporate social responsibility (CSR). Despite increasing efforts in CSR, past research has shown increased levels of mistrust and skepticism from consumers towards business. Furthermore, the very issues...
Black Rockfish are important commercial and recreational species and understanding their biology is useful in developing best management practices. A common means to assess diet in both freshwater and marine fishes is stomach content analysis, which can determine diet composition and infer foraging behaviors. We conducted a stomach content analysis...
Significant amounts of uncertainty owing to both modeling decisions and inherent randomness are present in simulating the material and geometric nonlinear response of structural systems to extreme loading. Computing the sensitivity of structural response with respect to model parameters indicates which parameters have the largest affect on the response, which...
The overarching purpose of this study is to examine the communication implications of a
self-proclaimed consensual organization (IT) within a classical organizational
environment. The literature review of relevant theory and research covers both
hierarchical and consensual organizations viewed via the classical, human relations, and
system perspectives. The researcher compares organizational...
At any given time, 60% to 85% of prisoners across the United States are struggling with substance addiction and dependence. Upon release, about two-thirds of former prisoners will reoffend and return to prison. Due to the high rate of substance use and abuse in prisons, drug treatment, specifically Correctional Therapeutic...
The purpose of this study was to analyze the change in gay/lesbian friendships after
the disclosure of their sexual identity. Six specific areas were examined: (1) what are the
circumstances under which persons find out their close friends are gay/lesbian (hereafter
referred to as the event), (2) do relationships change...
The popular perception, throughout the United States of America, is that there is a positive relationship between recent immigration and crime. The more immigration in an urbanized setting, the more violent crime occurs. Crime is socially constructed to be associated with large influxes of “outsiders” into the community. America has...
Over the past three years recreational cannabis legalization has emerged as a major policy issue in the United States. The novelty of this movement has created a gap in the state of literature focusing on the examination of cannabis legalization policy processes. Using a two-pronged Multiple Streams approach, this study...
The present essay discusses themes of dehumanization and reliance on a biomedical model of care within U.S. psychiatric systems in treating individuals diagnosed with psychosis. This model is contrasted with alternative treatment approaches that are person-centered rather than disease-centered. These include Open Dialogue, Soteria, and Hearing Voices Movement. In the...
Recent emphasis on linkages between essential fish habitat and fish stock productivity has raised concerns about the management of fishing activities such as trawling, which have the potential to impact fish habitat. Knowing specifically where and how intensively trawl effort has occurred over time provides ecologists with the necessary background...
To combat violence against women, the Brazilian government enacted the Maria da Penha Law (MPL) in 2006 and established the domestic violence specialized courts. Based on the assumption that fair procedures enhance the legitimacy of legal authorities and may enhance victims’ satisfaction and cooperation with prosecution, this research aims to...
In society, labeling can play an important role in how people interact with one another every day. This research focuses on the relationship between internalization and deviance, two important concepts in Labeling Theory. The main question is, does the internalization of a label play a role, whether it be positive...
High-speed police pursuits occur daily across the United States. On average, one person dies per day as the result of a police pursuit. In certain contexts, it might be acceptable to society for a police officer to engage in a high-speed pursuit. The ends could justify the means. For example,...
Estuaries, which provide viable habitat for a plethora of fish and invertebrate species, are being increasingly impacted by anthropogenic and natural forces. Estuaries are important nursery habitat for young-of-the-year (YOY) Pacific rockfish (Sebastes spp.). Yaquina Bay, a marine-dominated estuary on the central Oregon Coast, served as a study site for...
Reducing recidivism rates and raising success rates for individuals who experience mental or behavioral distress and have been through the legal system is the key to lowering the expenditure of valuable resources including time and judicial budget. Regardless, little research attention has been given to post-arrest diversion programming and reentry...
In this paper I examine the impact of recent immigration, in addition to other community predictors on community counts of violent and property crimes in Austin, Texas, a multi-ethnic city. I combine data from the 2000 US census of population and housing with census tract level uniform crime report data...
Particleboard is a commodity composite panel made from the residual materials of other wood products manufacturing companies. The industry operates on low profit margins and thus produces high volumes of differing panel grades. Slight inefficiencies over the course of a year can mean a significant loss in profit. Previous calculations...
Researchers have studied social entrepreneurship and offered detailed road maps of the process of becoming a successful social entrepreneur. However, these processes are not universal and will not function sustainably in every community. The idea that we do not know if a process will work within a community until tested...
The aim of this research is to understand and quantify the modeling differences between CSiBridge and OpenSees, and to determine sensitive model parameters. When designing bridges for the high seismic region of California, the California Department of Transportation (Caltrans) performs nonlinear time history analysis of their bridge models. For three-dimensional...
In this paper we outline a procedure we use for routine moment-tensor analysis of regional data from broadband seismic stations in northwestern North America and apply it to the moment magnitude 5.5, March, 1993, Scotts Mills, Oregon, earthquake. The results compare favorably with those obtained from teleseismic data. We found...
There is growing public concern about the high proportion of saturated fatty acids in milk fat; however, feed intake, energy partitioning toward milk synthesis, and milk fat concentrations can decrease when cows are fed high concentrations of unsaturated lipids. The objective of this study was to identify the optimal rate...
Fall-sown barley will be increasingly important in the era of climate change due to higher yield potential and efficient use of water resources. Resistance/tolerance to biotic and abiotic stresses will be critical. Low temperature is an abiotic stress of great importance. Resistance to barley stripe rust (incited by Puccinia striifomis...
In this study, I test for tacit collusion in retail gasoline markets by testing for sticky downward pricing and price leadership. Using an extensive dataset consisting of twenty-five gasoline markets located in the greater Willamette Valley region of Oregon, I find evidence of sticky downward pricing in every market. I...
This thesis presents the details of a large-scale laboratory experiment to study the
turbulence generated by waves breaking on a fixed barred beach. The data set includes
comprehensive measurements of free surface displacement and fluid velocity for one
random and one regular wave case.
Observations of the time-averaged turbulent kinetic...
The behaviors of the alfalfa leaf cutter bee - seed
production system under imposition of several management
regimes were studied through the use of a simulation
model that contains mechanisms for the following
processes: 1) immature bee development and diapause; 2)
immature bee mortality; 3) female bee emergence; 4)
nesting...
Pile supported bridges are typically constructed near or in a natural or man-made
slope and are subjected to lateral loading. The current design method for laterally loaded
piles involves the use of Winkler's spring concept with the standard nonlinear p-y curves.
The available p-y curves were developed based on results...
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Scott A. Ashford
Pile supported bridges are typically constructed near or in a natural or
Deep foundations, including driven piles, are used to support vertical loads of structures and applied lateral forces. Many pile supported structures, including bridges, are subjected to large lateral loads in the form of wind, wave, seismic, and traffic impact loads. In many practical situations, structures subjected to lateral loading are...