Aquatic animals are exposed to a variety of natural and
anthropogenic xenobiotics. Biotransformation of xenobiotics was
examined in three aquatic animals: a primitive mollusc (chiton);
a shellfish which is an important human food source (oyster);
and, a lower vertebrate model for toxicological studies (rainbow
trout). Since digestive glands of Cryntochiton...
In order to estimate wind turbine residL2;characteristics
in the presence of atmospheric turbulence, the important atmospheric
sources for the force excitations felt by the wind turbine system
must be identified and characterized. The goal of this research
is to develop the wind turbulence input model for horizontal axis
wind turbines....
Biogeochemical data from four small watersheds in the Silver Creek study area, southwestern Idaho, provide the basis for: 1. An estimate of chemical and erosional denudation rates (CD and ED), 2. an estimate of plagioclase weathering rate, 3. a rational basis for estimating the rate of nutrient supply to soil...
A theory is developed to provide an analytical solution to an
unsteady flow field which is partially occupied by a porous structure.
The flow is induced by a small amplitude incident wave
train. The porous structure may contain multi-layer anisotropic but
homogeneous media. Three typical porous structures are investigated:
a...
Red alder (Alnus rubra Bong.) seedlings fertilized with NH4NO3 or inoculated with a pure culture Fran/cia and inoculated with live or dead spores of the mycoirhizal fungus Alpova diplophloeus (Zeller & Dodge) Trappe & Smith were grown in a growth
chamber or in a greenhouse for six months Frankia inoculation...
Application of sewage sludge to soils increases the trace metal
content and the organic content of soils. The complexation of indigenous and added metals with organic constituents must be studied to
evaluate metal availability to plants and animals.
The water soluble organic fractions (WSOF) from an agricultural
soil (W), a...
Chapter 1 Growth and Survival of Root-Wrenched Douglas-fir Seedlings Root wrenching of seedlings (severing the roots 15 cm below the soil surface) was investigated as a nursery practice to improve growth and survival of field-planted Douglas-fir from six local seed sources
in the Pacific Northwest. At lifting, shoots of wrenched...
Significant post planting mortality of young conifer seedlings often occurs on drought prone sites because seedlings fail to either establish, or maintain favourable water relations. Survival is contingent upon growth which occurs when turgor pressure is above a threshold level. Since growth after planting is influenced by nursery cultural practices,...
The North Unit irrigation District of Central Oregon,
a water project developed under the guidelines of the
Bureau of Reclamation, is characterized by limited water
and the need for efficient utilization and control of the
irrigation system. To manage the limited water resource,
irrigators need a timely and economical method...
The volumetric receiver is an advanced solar central receiver
concept designed to produce high temperature air. This document
presents the results of a heat transfer and performance evaluation of
the volumetric receiver concept.
The volumetric receiver consists of an array of ceramic fins or
fibers arranged in concentric rows around...
To investigate the responses of healthy adult women to two
levels of vitamin B-6, a seven week two-part experiment was conducted
with five young adults and eight middle-aged subjects. During the
four unsupplemented weeks, dietary vitamin B-6 was 2.3-2.4 mg/day.
In the final three weeks, the same diet was supplemented...
Serine transhydroxymethylase (STHM), a pyridoxal 5'-
phosphate requiring enzyme is indirectly involved in
pyrimidine deoxynucleotide metabolism. A decrease in the
activity of this enzyme could lead to altered deoxycytidine
(dC) metabolism. This study was undertaken to determine if
a vitamin B-6 deficiency affects dC metabolism. The effect
of a vitamin...
Selected secreted and cellular virulence factors of Aeromonas
salmonicida were examined. A protocol was developed for the
separation of two secreted proteases (P1 and P2 protease), and
a trout erythrocyte specific hemolysin (T-lysin) from
supernatants of cultures of the bacterium. Distinctions between
the proteases were demonstrated using molecular weight
determinations,...
In this dissertation we consider the problem of
automating the design of access structures for relational
database systems. The main considerations are effective
and rigorous utilization of the users' usage patterns,
global treatment of the whole design and utilizing most of
the commonly known access structures.
We represent the usage...
Currently there is a lack of documentation on the
types of teaching methods being used to teach elementary
mathematics in Saudi Arabia, To help meet this need, this
research project studied the verbal behavior of Saudi
Arabian elementary mathematics teachers. A two-fold
problem was addressed.
1. To obtain a description...
Vegetation ecology of eight Oregon freshwater wetlands was
described and net aerial primary productivity estimated in four
wetlands. Plant cover samples were used to classify 37 wetland and
11 terrestrial communities by agglomerative hierarchical clustering.
Samples and species were ordinated. Direct measurements were made
of sample relative elevation, inundation duration,...
Early and late seral tree species were compared for inter-and intraspecific competitive ability; within-population genetic variability; and allocation patterns of soluble sugars and starch seasonally and in response to shade and nitrogen fertilization. Species were Douglas-fir (early seral) and western hemlock (late
seral) from a low elevation habitat; and noble...
The purpose of this research was to investigate the
effectiveness of using an early childhood language intervention
program with children who had been determined to be
language delayed at the ages of 3, 4 and 5 and to determine
how the early childhood langauge intervention program was
associated with changes...
The purpose of this study was to determine the validity of MMPI scores that were estimated from CPI data. This was later expanded to encompass whether generally low California Psychological Inventory (CPI) t-scores below 25 were predictors of elevated actual Minnesota Multiphasic Personality Inventory (MMPI) profiles. The sample consisted of...
The use of selected computer games was studied as an
intervention technique in an attempt to increase achievement
of learning disabled adolescents in basic multiplication And
division facts. A multiple baseline design across subjects
with a follow-up was employed in an applied behavioral
setting. The subjects were two female and...
The second law of thermodynamics, through the exergy
concept, allows us to quantify and rationally cost the
consumption of exergy (irreversibility) used to drive the
heat exchange process and the effluent losses of exergy in
a heat exchanger For systems with a network of heat
exchangers, the exergy concept recognizes...
An analysis of the economics of multiple use forest
planning is presented. At the forest level itself it is
demonstrated the use of duality information provided by
linear programming to price nonmarket commodities
allocations and to establish an accounting system in
multiple use forest management. The use of post-optimal
activity...
A major factor limiting the efficiency of plant improvement programs is the lack of knowledge as to which parental combinations to make when working with quantitatively inherited traits. The primary objective of this study was to provide information regarding the use of combining ability analysis to predict which cross combinations...
This study employed ethnographic methodology to investigate and record the post-camp, pre-assimilation period of Laotian refugees.The primary goal was to document the special problems and experiences of the Laotian population as they attempted to adjust to new roles and expectations within mainstream North American society.Oral histories and biographical statements focused...
The focus of this study was junior-level
mathematics students' perception of proof and its
relationship to achievement. The following
problems were investigated:
1) nature of perception of proof of
undergraduate mathematics students who have
enrolled in Advanced Calculus;
2) relationship between students' perception
of selected aspects of proof and their...
An extensive theory of symmetric error control coding has been developed in the last few decades. The recently developed VLSI circuits, ROM, and RAM memories have given an impetus to the extension of error control coding to include asymmetric and unidirectional types of error control. The maximal numbers of unidirectional...
Understory species associations and their association with tree species were examined on three intensively studied stands. We studied the chronosequence of understory species associated with different aged singleleaf pinyon (Pinus monophylla Torr. and Frem.) trees. Mid- to late pinyon-juniper understory succession was found to be more spatial than floristic in...
The objective of this research was to determine which
environmental resources, light, water, and nutrients,
control understory plant production and composition in a
Pinus ponderosa forest in northeastern Oregon. A split-plot
experimental design, with three blocks, four
treatments, and 44 plots, was established in the summer of
1985. Twenty plots...
Prior to 1986, economic conditions resulted in substantial
unemployment, layoffs, and reduced work time.
Such conditions produced underemployment resulting in significant
income reductions for families. A random sample
of a non-metropolitan Northwest community elicited 137
couples from a variety of incomes. Twenty-one of them
were found to have incomes reduced...
Because Douglas-fir [Pseudotsuga menziesii(Mirb.)Franco] bark is a raw material produced in our renewable forests along with wood, an understanding of the ultrastructure of bark cells is of paramount importance if wood technologists are to utilize the bark to the fullest potential. The objectives of this study were to develop microscopic...
The possible effect of oxidation [processing with or without sulfur dioxide
(±S0₂)] and of pre-ultrafiltration treatment of juices with enzymes and fining
agents on flux, and on juice color, composition and stability was investigated. White
Riesling juice was ultrafiltered with a Romicon system operated with a nominal
molecular weight cut-off...
A pest management program for Tetranychus urticae Koch in Oregon
peppermint was developed based on studies of sampling, plant phenology,
population dynamics and damage thresholds.
A sample size of 45 leaves provided a confidence level of 90%
and a confidence interval of 50%. Estimation of the sample mean was
based...
Early and later successional stages of the assemblage of turf algae and sessile
animals of a Macrocystis kelp forest were studied off San Nicolas Island, California
from 1980 through 1981, and 1983 through 1984. Kelps were manipulated to
determine if differences in illumination could account for dominance by turf algae...
Ptychoptera townesi (false crane fly, Diptera) occur in high densities in an experimental stream section that has not been allowed to exceed bankfull flow for more than two decades, but are quite rare in areas both upstream and downstream from this section. By contrast, Paraleptophlebia spp. (mayfly, Epherneroptera) are relatively...
A comparative analysis of structures related to
capture and processing of food, in 624 specimens belonging
to 31 species of Sebastes of Oregon was made. The
structures studied were the following: the tooth-bearing
bones (premaxillary, dentary, vomer, palatine); the
maxillary, angular, articular, parasphenoid and glossohyal
bones; the lower limb of...
The goals of this study were to discover and compare the religious
and philosophical traditions which have shaped Japanese and American
cultures, and to make a case for interdisciplinary transcultural programs
of study in higher education. Specifically, the purposes of this
study were to: (1) describe and trace historically the...
The tracheal mite, Acarapis woodi (Rennie), parasitizes the
honey bee, Apis mellifera L., an insect used extensively by humans
for pollination of domestic crops and for bee products, primarily
honey.
This parasite was first discovered in 1921 on the Isle of
Wight, a small island situated in the English Channel...
Senecio jacobaea (tansy ragwort) is a common weed in the
Pacific Northwest that contains toxic pyrrolizidine alkaloids
(PAs). Jacobine, the major PA in Senecio jacobaea, was incubated
with rat liver microsomes and metabolites were isolated by high
performance liquid chromatography (HPLC) and identified by mass
spectrometric analysis. Metabolites included a...
The suitability of discrete least-squares optimal (Wiener) filters
for deconvolution of tone-burst waveforms is studied. It is shown
that: (1) such waveforms are not well suited to these filters without
preprocessing, (2) the use of exponential weighting results in a significant
improvement in filter performance and (3) that "phase-unwrapping"
in...
This study examined time spent in various activities by
farm women. Emphasis was placed on household work time and
how time is apportioned among various household work
activities. Time use of farm women was compared to rural
nonfarm women and urban women. Data were from An
Interstate Comparison of Urban/Rural...
Replication associated protein and enzyme activity levels increase as cells enter
S-phase of the cell cycle and diminish as cells leave S-phase. Accordingly, replication
associated functions decrease as myoblasts withdraw from the cell cycle to terminally
differentiate. In an effort to understand signals effecting growth associated expression
of genes, the...
A thermodynamic analysis of forced geoheat recovery from aquifers
has been accomplished. The system investigated consists of a single
recharging-discharging well pair, in a horizontally extensive aquifer,
with either power generation or space heating as surface applications.
The space heating systems investigated are (i)direct heating, (ii)heat
pumps and (iii)a combination...
Existing forest site maps have been described as "invaluable
tools" in forest management. Their, economic value potentially materializes
as the summed advantage from better decisions in all phases of
forestry.
Via Bayesian decision analysis, this study establishes optimal
use and economic value of site information for one facet of management...
The purpose of this research was to test the effectiveness of
the ethnographic method as a tool for evaluating nontraditional
adult and continuing education programs. The program evaluated was
the Oregon Heritage Festival, a four-week Summer Term activity
designed to eclectically draw upon the arts, humanities, and science
to illustrate...
Lagrangean relaxation is presented as a solution
technique to solve flow constrained area-based harvest
scheduling problems. The best set of multipliers in the
Lagrangean approach is obtained through the subgradient
method. Guidelines to set some parameters to compute the
step size in the subgradient algorithm are provided. An
additional procedure...
The ingestion, uptake, and metabolism of liposomes by juvenile
Pacific oysters (Crassostrea gigas) were studied by several methods in
an effort to assess their potential as encapsulating agents. Liposomes
composed of egg phosphatidylcholine-cholesterol-stearylamine (7:1:2)
formed readily and appeared stable in 20°/oo seawater. Radiotracer
studies with liposomes made with ¹⁴C-labeled cholesterol...
A new experimental technique for the study of
atom-surface interactions is obtained by passing an atomic
beam containing high-Rydberg states through a fine mesh
target. The technique is demonstrated to be a sensitive
probe of the electric fields of adsorbed dipole layers in
transmission experiments in which a time-dependent beam...
Hysterangium, a genus of hypogeous Basidiomycotina (false truffles) is
commonly placed in the Hysterangiaceae and ascribed affinities to the Phallales. It
is a large genus among hypogeous taxa and is commonly collected in large
numbers in eastern and western North America, Australasia and Europe. Some
Hysterangium species are dominant components...
The objectives of this study are to: 1) study the variations
among stands of old-growth Sitka spruce forest located within a relatively
restricted geographical area, 2) determine the relationship between
species distribution, vegetational pattern, and such site factors
as slope and aspect, and 3) ascertain the abruptness of phytosociological
change...
The goal of this study was to determine the extent to which the Silviculture Institute, a 12-week continuing education program for mid-career silviculturists, has influenced the practice of silviculture in the Pacific
Northwest. Desired impacts were determined in conjunction with the three major stakeholders in the Institute: program leaders charged...
Verticicladiella wageneri Kendrick is a vascular wilt
pathogen of conifers, causing a black staining of
colonized sapwood of roots and lower stem. In Douglas-fir,
V. wageneri is intimately associated with insects.
Hylastes nigrinus, Pissodes fasciatus, and Steremnuis
carinatus are commonly associated with diseased hosts,
carry inoculum of V. wageneri in...
In recent years, the role of the City Manager in municipal
policy making has been the focus of considerable attention and debate in
both the academic and local government arenas. The purpose of this
study was to determine the differences in views of elected mayors and
appointed managers with regard...
Small-mammal community composition, microhabitat selection, and
dispersal of mycorrhizal fungal spores were studied in southwestern
Oregon. Sampled habitats exhibited structural variation resulting
from silvicultural practices.
In 1981, the effect of clearcut treatment on these phenomena was
evaluated. In 1982, the effect of forest structure was studied.
Discriminant function analysis (DFA)...
These studies examined the role of perinatal androgen
in the development of neuroendocrine and behavioral
characteristics of gray-tailed voles, Microtus
canicaudus. When mature, females exhibited alternating
vaginal smear patterns or persistent vaginal
cornification; estrogen and progesterone concentrations
were not correlated with vaginal smear patterns. Corpora
lutea were not observed in...
One hypothesis proposed to explain how the endocrine
system controls reproductive cycles in seasonally breeding
animals is that the hypothalamus undergoes seasonal
changes in sensitivity to negative feedback by gonadal
steroids. The result is seasonal changes in the secretion
of luteinizing hormone-releasing hormone (LHRH) and
gonadotropin secretion. The present experiments...
The effect of the abundance and rapidity of ectomycorrhiza and root tip formation on
conifer seedling survival and growth was investigated on disturbed forest sites in southwest
Oregon and northern California. Experiments were conducted over a range of
community types and environmental conditions. A range of sources of transfer soil...
To improve the efficiency of herbicide
applications, each stage of the spray application
process must be considered. Two of these stages, the
process of spray deposition within plant canopies and
the influence of the form of the spray deposit on
efficacy were investigated.
The effect of droplet size, spray volume,...
Birds affected the community structure of an Oregon rocky shore by
preying upon mussels (Mytilus spp.) and limpets (Collisella spp.). The
impact of such predation is potentially great, as mussels are the
competitively dominant mid-intertidal space-occupiers, and limpets are
important herbivores in this community.
Prey selection by birds reflects differences...
The purpose of this study was to investigate physical education
and sport in Thailand and, based upon expert opinion, to develop a
blueprint of physical education and sport for the nation building of
Thailand. The investigation concentrated on the history, role and
function, purpose of governmental involvement, and future prospects...
Organizations leading education reform of the 1980's
have challenged teacher education programs at colleges and
universities across the nation to improve the subject
matter content preparation of teachers. Past methods of
program development and techniques to assess teacher's
knowledge competence have been one-sided in their
approach. New research studies on...
Alzheimer's disease, a chronic and irreversible form of
dementia, has been recognized as one of the most critical
medical-social-economic problems facing our country. As
Alzheimer's disease and other related dementias progress,
the patient becomes increasingly dependent upon family and
natural support systems to provide care. This dependency
can place the...
This study examined the ralationship of organizational
structure and job satisfaction in Iranain iron companies.
Sixteen of 27 Iranian iron companies were randomly
selected for the study, and 195 middle managers in the 16
companies were surveyed with a three part instrument
consisting of Likert's (1967) Profile of Organizational
Characteristics;...
Attachment, as described by Bowlby (1969), is an emotional bond between two people. It is an invisible internal characteristic which is assumed to exist because of behaviors exhibited by the attached individual. These proximity seeking behaviors are critical for survival of the infant. Sensitivity of the mother to the infant's...
The purpose of this study was to examine the relationship between career development and locus of control as
they relate to barriers encountered in career development.
The sample included 144 students in the engineering
program at Oregon State University. The Rotter Internal-
External Scale and the Career Development Inventory (Form...
The objectives of this study were to: (1) determine if individual
differences in the learner characteristics of field dependence, state
and trait anxiety, age, sex, and prior computer experience were related
to performance in operating a computer system; (2) to determine if
differences in performance would occur as a result...
This study examined the relationship and strength of association
of the two independent variables of gender (male, female) and perceived
sex role identity (masculine, androgynous, feminine, and
undifferentiated) on the leadership style, leadership range (number of
back-up styles), and leadership adaptability (effectiveness) of nonforeign
graduate students at a Land Grant...
The central problem of this study was to determine
whether ego stage scores are valid predictors of empathy and
mature moral judgment in women graduate counseling students.
The research was based on the theories of ego development
(Loevinger, 1976), empathy (Rogers, 1975; Hogan, 1975) and
moral values (Hogan, 1970).
Forty-three...
Twenty-seven male college football linemen from the Oregon State
University football team served as subjects for the study to determine
which variables in strength and power would be best suited for use in
regression analysis with tibial nerve conduction velocity (TNCV). The
purpose of the investigation was to determine whether...
In higher vertebrates, normal digestion and absorption by the
gastrointestinal tract are dependent on the orderly and controlled
transit of intraluminal contents. A relationship between fluid
passage through the gut and absorption from the gut has yet to be
examined in fish. In marine teleosts, the osmolality and ion concentration...
The major purpose of this study was to test the relationship between
students' cerebral lateralization for the Arabic language and
their achievement in science. A secondary purpose was to investigate
handedness as a factor in that relationship. The experiment was conducted
in the City of Jeddah, Saudi Arabia, using dichotic...
The major problem examined in this study was that of
determining whether or not there is any relationship between
student ratings of instruction in the community college
university transfer area and the professional teacher-training
backgrounds of instructors. In addition, several
other factors which may influence ratings and which might
interact...
The purposes of this study were to determine
relationships between burnout and selected demographic
and job-related variables and to identify burnout coping
strategies commonly used by teacher-coaches in public
secondary schools. A volunteer sample of 193 teacher-coaches
responded to a three-section questionnaire
composed of the Maslach Burnout Inventory, the Jaloweic...
Vaccinia virus gene expression is characterized by tight temporal
regulation. Viral early transcription begins within the cytoplasm upon
infection; three hours later, early genes are repressed, DNA replication
occurs and late gene expression commences. As an approach toward
understanding the mechanisms governing vaccinia late gene expression,
I have undertaken an...