Studies were initially conducted to determine the action of
intravenous serotonin on perfused segments of human umbilical
cords in vitro. Intravenous serotonin, via bolus injection or
continuous infusion, was found to elevate venous perfusion pressure,
while intra-arterial serotonin failed to alter venous pressure.
Norepinephrine, administered to the venous perfusate, was...
Numerous fishery researchers have attempted to preserve viable fish sperm, but only three investigations were successful in the fertilization of fresh eggs with frozen and thawed sperm: Blaxter (1953); Hoyle and Idler (1968); and Graybill and Horton (1969). Significant advances reported in this thesis were: the development of suitable life...
Previous investigations have shown that exposure to DDT results
in increased activity in soluble and microsomal enzyme in insects.
These responses in DDT-resistant Triatoma infestans
nymphs and in adults of DDT-resistant Musca domestica (the common
house fly) are accompanied by increased RNA and protein synthesis.
The phenomenon has been termed...
Farmer cooperatives have often maintained inflexible capital structures which severely restrict members' freedom to allocate their own capital in a most profitable manner. This study was conducted to provide insights into how cooperative finance programs might be modified to provide increased capital and, at the same time, be more acceptable...
Two experiments involving 33 Holstein cows were conducted
for the primary purpose of studying the effects of flumethasone (a
synthetic glucocorticoid) on milk and milk constituent yields. The
secondary purpose was to compare udder health, reproductive performance,
and body weight changes of cows on flumethasone therapy.
Nine Holstein cows were...
The primary purpose of the study was to identify the demand
for processed salmon from the West Coast. The basic approach in
the demand analysis was to identify those variables that determine
the supply and demand for processed salmon. An econometric model
was established containing the supply and demand equations...
Three trials with wethers and four trials with steers were
conducted to determine some of the effects of sodium bicarbonate,
calcium hydroxide and/or transfer of ruminal contents on ruminant
adjustment to abrupt changes to concentrate rations.
Lambs fed a basal concentrate diet plus sodium bicarbonate had
the highest average feed...
At the time of this study 19 states have entered into agreements, one state agreement is pending and one state has submitted its proposal for entering into an agreement with the Atomic Energy Commission for the purpose of assuming regulatory authority over (1) byproduct, (2) source and (3) special nuclear...
Growth and reproductive patterns of the common lanternfish,
Stenobrachius leucopsarus, are described by length frequency
analysis, otolith analysis and examination of ovaries.
Length frequency analysis, employing the probability paper
method of analysis of polymodal distributions, of three and one-half
years of monthly midwater trawl collections off Oregon showed that
fish...
This analysis concerns the life and scientific work of Henry
Augustus Rowland (1848-1901), organizer and the first chairman of
the physics department at The Johns Hopkins University in 1876.
Special materials used in this research included three pieces of
Rowland's experimental apparatus which are extant in the Smithsonian
Institution Division...
The stability of a third-order, nonlinear system with a
saturation characteristic was studied by applying the second method
of Liapunov, which is the most general approach currently used for
dynamic systems.
This thesis presents (1) the analysis of a third-order, nonlinear
system, (2) a suitable Liapunov function, generated by the...
Most studies of bacteria in water have concerned public health; little attention has been given to organisms which are indigenous to
the aquatic environment. Myxobacteria are known to occur in soil,
in the marine environment, and several have been studied in relation
to diseases of salmonid fishes. However, little information...
Heartwood samples of Pacific Coastal Douglas-fir (Pseudotsuga
menziesii var. menziesii) and Rocky Mountain Douglas-fir
(Pseudotsuga menziesii var. glauca) were rated for relative liquid
permeability, and evaluated for kraft pulping characteristics.
Highly impermeable wood of the Rocky Mountain variety was termed
"refractory," while the pervious wood of the Pacific Coastal variety...
Evaluations of body form and measures of milk production were
recorded for 188 Holstein lactations and 77 Jersey lactations in the
Oregon State University Dairy Herds. Components of body form
included general appearance, dairy character, body capacity, and
mammary system and 34 sub-components of these four traits plus body
weight...
The primary purpose of this thesis is to determine the economic nature of low incomes on low-income farms in western Oregon. An economic model containing variables that contribute to family income is developed for farm operators in the study area. Regression analysis is used to determine the significant variables contributing...
One means of evaluating the temperature requirements of an
animal is to determine changes temperature causes in the uses and
losses of energy and materials in the food the animal consumes. To
develop energy budgets for cichlids (Cichlasoma bimaculatum) at different
temperatures (20, 24, 28, 32 and 36 C) data...
The effects of two patterns of logging on the intragravel environment were studied in three Oregon coastal streams between June 1968 and June 1969. The watershed of one stream (Needle Branch) had been clearcut, and that of a second stream (Deer Creek) cut in staggered settings in 1966. A third...
Two experiments were conducted to study the effects of
melengestrol acetate (MGA) on inhibition of estrus, post-treatment
conception rates in heifers and rats, and MGA given during gestation
on the reproductive performance in rats. MGA was administered
orally to Holstein heifers and by subcutaneous injection to Sprague-
Dawley rats.
Twenty-four...