In addition to its longstanding recognition as an influential evolutionary process, interspecific hybridization is increasingly regarded as a potential threat to the genetic integrity and survival of rare plant species, manifested through gamete wasting, increased pest and disease pressures, outbreeding depression, competitive exclusion, and genetic assimilation. Alternatively, hybridization has also...
This study was designed to assess the effects of approval seeking motivation and social cost upon conformity to group norms which were inconsistent with personal values. Utilizing the Asch conformity paradigm, 321 subjects were exposed to a group opinion which was contradictory to one of their personal values. The results...
Chromium spills on soils are causing severe groundwater contamination
problems. To increase the performance of cleanup methods, the chemical behavior
of chromium in soils and its transport through soils have to be understood. The
objectives of this research were to investigate the sorption characteristics of
chromium(VI) in soil and to...
Commercial production of soybeans in Oregon has been limited. In
1977, less than 1,500 acres were grown, primarily in the Columbia Basin
area. However, interest in soybeans as a possible "new crop" for Oregon
has arisen because of the (1) recent strong soybean price, (2) the high
cost of transporting...
Feedlot finishing of beef cattle in Southern Alberta involves
income risk due to the variability of prices of feeders, feed and
finished cattle. Several strategies are available to reduce this
risk, including hedging of cattle on feed, participation in a Federal-
Provincial government and producer established income stabilization
program for...
A model was developed to simulate winter wheat production on
irrigated farmland similar to that found near Hermiston, Oregon. The
simulated farm is irrigated with a side roll sprinkler system. A well
is located adjacent to the wheat field and the water is delivered by
an electrically powered pump. The...
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...
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...
In this paper a direct, constructive proof of the equivalence of the Normal Algorithm and Turing machine using the Turing machines NAS (Normal Algorithm Simulator) and NAC (Normal Algorithm Converter) is presented. The Turing machine NAS can simulate any particular Normal Algorithm, and NAG can convert the quintuples of a...
Diet, nutrition, and foraging strategies of canvasbacks (Aythya valisineria) and redheads (A. americana) were studied by collecting actively feeding birds throughout the reproductive season in 1980 and 1981; samples of available foods were taken each time a bird was collected. Nutrient composition of the aggregate diet was determined for each...
Purpose
The purpose of this study was to discover the status and characteristics of reading programs in the public secondary schools of Oregon.
Procedures
Questionnaires were mailed to all of Oregon's 327 schools, 106
junior high schools and 221 senior high schools. Responses were received
from 84.7 percent of the...
New alloys containing refractory metals have been developed
by the aero-space industry to meet the demand for thermally resistant
materials. The chemical analysis of these alloys has been
handled successfully by the use of ion exchange. Hydrofluoric acid,
either alone or combined with hydrochloric acid, has here-to-fore
been used to...
A two phase investigation was undertaken in an attempt to determine the effects of variations in salinity on the distribution of benthic estuarine diatoms. The estuary studied was that of the Yaquina River which originates in the Coast Range of western Oregon and discharges into the Pacific Ocean at the...
The objectives of this study were to quantify and describe:
(1) the major plant communities and their distribution, (2) the
distribution and movement patterns of large herbivores relative to
water, topography, and plant communities, (3) the daily activity
patterns of each herbivore, and (4) the borne range size of wild...
The purpose of this study was to identify if differences existed in perceived barrier factors and perceived attitude factors toward distance education between faculty and administrators in the decision stage and those in the implementation stage of distance education technology adoption. Information was gathered from teaching faculty and program leaders...
This thesis examines the postmodern confrontation of representation throughout the oeuvre of Martin McDonagh. I particularly look to his later body of work, which directly and self-reflexively confronts issues of artistic representation & masculinity, in order to gain a more nuanced understanding of his earliest and most controversial plays. In...
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 response of sweet corn Zea mays L. var. rugosa (cultivar
'Jubilee') to row spacing, nitrogen and population density at two
planting dates was studied in a field experiment at the OSU
Vegetable Research Farm in 1984. Variables included two row
spacings, 75 cm and 90 cm, three nitrogen rates,...
The McDonald Forest is one of the Oregon State University Research Forests, owned by the College of Forestry and located approximately seven miles northwest of the heart of Corvallis. I took four hikes on the McDonald Forest at four major recreation destinations: Oak Creek, Dimple Hill, Lewisburg Saddle, and Peavy...
Sediment was fertilized with f/2 algal growth medium
in situ and in the laboratory daily for one week. Sampling
strategy incorporated two intertidal heights and two sites.
Experiments were done in August and January. No significant
changes in chlorophyll a or diatom community structure
were observed after ten days of...
Three distinct stages of flower cluster abscission were identified
prior to fertilization: flowers which did not begin development (stage
1), flowers which had begun development (stage II) and clusters which
had begun to form distinct nuts (stage III). Abscission of stages I
and II coincided with a rapid increase in...
The objective of this work was to define the effects of
dietary energy intake on broiler fat deposition and
metabolism. Fatty broilers are one of the major problems in
the broiler industry.
The effects of changing calorie to protein (Cal/Pr)
ratios, and the addition of cellulose or dried distiller's byproduct...
Twenty managers of large diversified irrigated farms in the Willamette Valley area of Oregon were interviewed about the economic information and analysis techniques they use when making crop selection decisions. Two community college farm management instructors, two agricultural lenders, and two certified public accountants working with farmers were interviewed about...
Dissolved silicic acid (Si(OH)4) and biogenic silica (BSiO2) concentrations were measured on four different cruises in the Southern Ocean along 1700 W from late October 1997 to mid-March 1998. These data were used to construct a vertically integrated Si budget in the surface layer from 58° to 68° S. Throughout...
A phytoplankton bloom dominated by the pennate diatom Nitzschia
curta (Van Heurck) Hasle was observed during January-February 1983 at
a receding ice-edge in the Western Ross Sea, Antarctica. The core of
the bloom was found between 100-150 Km from the ice-edge. Nitzschia
curta cell densities up to 22 x 10⁶...
As the capital requirements for the modern dairy enterprise increase, the Oregon milk producer and his lender need more information concerning the profitability, solvency and liquidity of the enterprise on which to base their financial decisions. This research examines three areas where more information could be used to
evaluate financial...
Conservation is, among other things, the expression of a relationship between humans and nonhuman nature. This relationship can be described empirically using the methods of social science, but it can also be prescribed in the form of philosophical arguments. Scholars in the field of environmental ethics have discussed and debated...
Five experiments were conducted to investigate the
effect of dietary fish meal on the incidence of Sudden Death
Syndrome (SDS) in broiler chickens. Growth, feed
efficiency, total mortality and mortality due to SDS were
evaluated. Necropsy examination was performed on broilers
suspected of dying from SDS. Liver lipid and fatty...
This thesis reports a portion of a general ecological study of
a stream under conditions of controlled flow and low levels of organic
enrichment. It is concerned with the effects of experimental variations
of light intensity and concentration of soluble organic enrichment
imposed on seasonal variations of temperature and total...
The high quality feedstuffs which are used in poultry feeds
are costly and could be used directly for human food. There is less
competition for fibrous feedstuffs which are less digestible by
humans and other nonruminants.
Feedstuffs containing crude and refined dietary fiber were
examined for their effects on performance,...
The objectives of this study were to 1) measure and compare the compositional differences of essential oil among three hop cultivars ('Centennial’, 'Citra' and 'Nelson Sauvin'), 2) identify the odor-active aroma compounds in three varieties of hops and 3) investigate the behavior of hop-derived aroma compounds in beers prepared by...
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...
A simulation model capable of execution on a programmable
calculator was developed to study voluntary intake,
liveweight change, and fertility of grade Zebu cows in the
Llanos of Colombia. Organic nitrogen in the diet and meta
bolic weight were used to predict intake; age, liveweight,
and energy concentration were the...
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...