Studies were conducted to determine the nature of the interaction
between atrazine (2-chloro-4-ethylamino-6-isopropylaminos-
triazine) and magnesium on tomatoes. This interaction was
studied under two light regimes: continuous light and a 12-hour
photoperiod. Tomato plants were grown in sand cultures at three
levels of magnesium fertilization. Four weeks after planting,
atrazine...
Procedures were developed for assaying the biosynthesis of (-)-
kaurene-¹⁴C and other intermediates in gibberellin (GA) synthesis
from mevalonic acid-¹⁴C in cell-free enzyme extracts of immature
pea (Pisum sativum L. cv. Alaska) seeds. This system was utilized
to investigate three aspects of GA biosynthesis: (1) apparent capacities
for (-)-kaurene biosynthesis...
Contracting nucleolar vacuoles are a general and consistent
feature of somatic tobacco cells growing in microcultures. Nucleolar
vacuoles were studied in cells from callus tissues of two
single-cell clones, H-196 and H-239, of hybrid tobacco (Nicotiana
tabacum X N. glutinosa). Vacuoles periodically contracted either
completely or incompletely, apparently releasing a...
Experiments are reported which demonstrate that a cobalt deficiency
in R. meliloti results in a decreased cytochrome content of
bacterial cells. It is concluded that the effect of cobalt deficiency
on cytochrome content of Rhizobium cells and on the leghemoglobin
content of nodules possibly may be explained by an effect...
Partial reactions of photosynthesis were examined in the wild
type strain and six photosynthetic mutants (8, 11, 26, 40, 50, a') of
Scenedesmus obliquus, strain D₃. A reproducible procedure for the
isolation of active chloroplast fragments from Scenedesmus was
developed. Several chloroplast reactions were examined, as well
as two in...
Bioavailability of selenium (Se) in processed tuna and
wheat products was studied in humans and rats. The protein
source of the rat diets was torula yeast with Se supplied by
either raw, precooked or canned tuna, or whole wheat flour,
bread or bran. Sodium selenite was used as a control....
The purpose of this study was to explore the relationship between stress, health, and health behaviors. The population for the study was made up of 231 full-time employees from Eastern Montana College. The subjects completed the Social Readjustment Rating Scale (SRRS), the Seriousness of Illness Scale (SIRS), the La Crosse...
Shoot apex senescence is defined as the collective progressive
and deteriorative processes which ultimately terminate the functional
life of the shoot apex. Senescence of shoot apices of Pisum sativum
L. 'Alaska' as measured by cessation of stem elongation was delayed
by removal of flowers and by treatment with gibberellin A₃...
Experiments were conducted under field and greenhouse conditions
to investigate the effects of chlorpropham (isopropyl mchlorocarbanilate)
on vegetative and reproductive development in
Chewings fescue (Festuca rubra L. subsp. commutata Gaud.) and to
determine the time of induction and initiation under natural conditions.
Chewings fescue was found to be very susceptible...
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...
This thesis presents a model of legged locomotion in
which position and velocity of body are directly controlled
by positions and velocities of feet. One central
relationship between foot acceleration, leg stroke and body
velocity is developed. Procedures for determining all
parameters of a step sequence including periods of constant...
The primary goal of this research was to determine the concentration and composition of nucleotides, as nucleoside monophosphates and nucleobases, in the underutilized reproductive organs (milt and roe) of Alaska pollock (Gadus chalcogrammus) and yellowfin sole (Limanda aspera). Changes in concentrations of these nucleotides and nucleotide analogs were observed with...
This research investigated the effects of Pediococcus spp. on Oregon Pinot noir wines. Pediococcus (P. parvulus (7), P. damnosus (1), P. inopinatus (1)) isolated from Oregon and Washington state wines demonstrated differences in their susceptibility to SO₂ with some isolates growing well in model media at 0.4 mg/L molecular SO₂....
The pressure history of a continental magmatic system can be deciphered by analyzing the composition of amphiboles in the eruptive products where the pressure of equilibration correlates with the depth of the magmatic system. This can reveal vertical evolution of the magma as amphibole composition varies significantly with temperature and...
Genetic, ontogenetic, and environmental factors modified characteristic interrenal and glycemic responses to stress in juvenile salmonid fishes. During continuous confinement stress, plasma cortisol rose more quickly in chinook salmon, Oncorhynchus tshawytscha, acclimated to high rather than medium or low temperatures; hyperglycemia following either acute or chronic stress was also highest...
The development of a market for currently non-merchantable forest material, such as harvest residues of tops and limbs of trees or small diameter trees, has been suggested as a possible win-win solution that could: (i) provide a financial incentive to help motivate treatments to reduce wildfire risk or restore forest...
The development of modern industries calls for the
robotic manipulators with high speed and accurate tracking
performance. Many authors have paid attention to robust
control of robotic manipulators; however, only few authors
have also considered the control problem of manipulators
with power limitation.
In this dissertation, the robotic manipulator is...
There is no information available on water management of birdsfoot
trefoil grown for seed. Information is also not available describing how to
minimize seed losses due to shattering in order to obtain consistently high
birdsfoot trefoil seed yields. The objectives of this research are to: (i) quantify
crop water use,...
In comparison with solar radiation, the energy of geothermal
heat flowing through the sea bottom is extremely small; nevertheless,
this energy is not insignificant in the circulation of the bottom water.
Calculations indicate that in the deep basins of the South Atlantic the
water volume transport necessary to remove this...
Based on the principle that the history of a discipline is important to the discipline itself, this thesis devotes two chapters to ROBERT HOOKE AND THE FOUNDATION OF GEOLOGY and two chapters to modern geology, viz. THE TECTONIC EVOLUTION OF THE OREGON CONTINENTAL MARGIN. The first part of this abstract...
The chlamydiae are a family of obligate intracellular bacteria that have a unique bi-phasic developmental cycle, unique cellular properties, and a unique set of challenges to studying its biology. While genetic manipulation is becoming routine in Chlamydia, there are significant challenges to working with this intracellular parasite. The body of...
The primary purpose of this study was to investigate the formal
preparation currently required and desired for teachers of lower-division collegiate courses in public community colleges in the western
United States and to make recommendations for the preparation of
such teachers in Oregon. The identification of the functions of institutions...
An experiment was conducted to examine the responses to
selection for high and low rate of gain in the mouse under a system
whereby inbreeding was maximized. Rate of gain was measured by an
index designed to include gains in both the pre- and postweaning
periods with the gains in...
Darwin devised the evolutionary theory of sexual selection to account for the manifold extravagances of courtship behaviors and displays. Mating interactions represent a major evolutionary process driving the elaboration, vibrancy, and peculiarity of these courtship traits. For my dissertation research, I strived to elucidate the dynamics that constitute the complex...