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....
A five year longitudinal study was begun in 1976 to find a
solution to the problem of early primary children who fail in school
and then adopt the failure syndrome. The study was conducted in four
elementary schools in Oregon which had distinctly different
socio-economic populations.
The tests used for...
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...