Stale flavor development has been recognized as a defect of
stored dry milk powders for several years. Recently, stale flavor
development has been found to occur upon storage of sterilized concentrated
milk, and is recognized as the principal limiting factor to
commercial utilization of this process (Seibert, 1963).
Some attempts...
Atrazine is an asymmetrical s-triazine herbicide used pre-
and post emergence for weed control in many crops. Triazine herbicides
have been used in the Pacific-Northwest for weed control in
orchard crops. Under certain conditions where trees were grown
in nutrient deficient areas, it was noted that toxic symptoms due to...
This thesis brings together under one cover a survey
of the history of the real number e along with a study
of the present state of its theory and calculation.
Previous research has shown that activated carbon is effective
in inactivating certain herbicides applied as a preemergence treatment.
Studies were conducted in the greenhouse to determine the
influence of various factors on the ability of activated carbon to
inactivate herbicides applied after carbon application. Field studies
were conducted to determine...
Growth and replacement patterns of four successionally important
species occurring on Douglas fir clear-cuts were investigated
from September 1964 to June 1967. The study was carried out
on the Marys Peak watershed located near Corvallis, Oregon.
Species used in the study include Holcus lanatus, Senecio
jacobaea, Lotus crassifolius var. subglaber,...
In previous years, at Corvallis, yields of bush snap beans
varied among planting dates. In order to obtain additional information
on the effect of planting dates on the growth, development and
yield of snap beans, four field plantings and two greenhouse plantings
of the variety O.S.U. 2051 were made.
Results...
The regulation of ergosterol biosynthesis in yeast has been
studied. The system has been examined for the presence of an end-product inhibition. Both anaerobically and aerobically grown cells
have been examined for this effect. A feedback inhibition of sterol
synthesis has been shown, but it appears to be a secondary...
This study was undertaken to determine the sorts of polygalacturonases
present in the culture filtrate of Fusarium oxysporum
f. sp. lycopersici, to purify and characterize these enzymes, and to
study any complexes that may form between polygalacturonase and
carbohydrate not degraded by the enzyme.
The polygalacturonase in culture filtrate consists...
Studies were conducted to determine the site of DCPA toxicity
on annual ryegrass. This was done by means of a technique which
used pyrex tubing and a vapor barrier to separate exposure of coleoptile
and roots of emerging grass seedlings to various concentrations of DCPA. Coleoptiles that emerged through treated...
The cuticle of the cercaria of Acanthatrium oregonense was
studied by means of electron microscopy and histochemistry. The
integument of this cercaria has a definite ultrastructure which
varies in different regions of the body. The body cuticle is a
syncytium containing vesicles and mitochondria. It is bounded
externally by a...
Pine needle blight of Pinus ponderosa Laws. caused by
Elytroderma deformans (Weir) Darker is recognized by changes in
the needles, in the bark and in the development of the branches.
Anatomical studies of the host-parasite relation have been made previously
on young pine tissue up to four years of age...
A method by which barrier heights in potential functions
hindering internal rotation in organic molecules can be obtained solely
from thermal data for the solid phase is studied. The observed
heat capacities are analyzed in terms of contributions from the lattice
vibrations, the intramolecular vibrations, the expansion of the lattice,...
The reactions of aldehydes with proteins are of nutritional and
physiological significance. The nutritive value of food materials can
be impaired by a reaction necessitating additional dietary protein,
and enzymes have been shown in vitro to be inhibited by reactions
with aldehydes.
Aldehydes present may arise from the autoxidation of...
The Artemisia ludoviciana polyploid complex is a highly polymorphic
assembledge of eight taxa in the Pacific Northwest, with a
chromosome base number of x=9. A cytogenetic analysis of this
complex was carried out to determine the sources of its variation,
the types of polyploidy present, and the genetic processes active...
The use of CIPC (isopropyl N-(3-chlorophenyl) carbamate) to
control dodder (Cuscuta spp.) in alfalfa is an established practice. A
rate of six pounds per acre applied to moist soil has given good dodder
control lasting from four to six weeks.
The purpose of this study was to determine the effect...
The purpose of this study was to investigate the relationship
between specific mother-child interactions and selected aspects of
language development in "disadvantaged" children.
The subjects were 19 preschool children in a summer Head
Start program in Denver, Colorado. Their ages ranged from four
years-nine months to five years-seven months. Eighteen...
One purpose of this study was to evaluate three commercial
detergents by comparing their removals at 70 and 120°F. of palmitic
acid and clay components of a simulated natural soil which had been
applied to wool yarns by immersion and abrasion methods. These
detergents were a built soap and two...
The purpose of this study was to develop an achievement test
suitable for eighth grade industrial arts, in the Province of British
Columbia. The test was designed to conform to the limitations established
in the curriculum bulletin, Industrial Arts 8, authorized in
1962. Norms were to be developed from the...
A numerical solution to Hodgkin and Huxley's partial differential
system for the propagated action potential is presented. In
addition a three dimensional demonstration of the absolute refractory
period is given. Lastly, theoretical evidence supporting
Rushton's hypothesis is presented.
The hop cyst nematode, Heterodera humuli Filipjev, 1934 was
first reported from Europe in 1894, however, very little is known
with respect to the biology and economic importance of this pest.
Abundant material from Oregon hop yards provided an excellent
opportunity to add additional details concerning the bionomics of this...
It was the intent of this investigation to compare the performance
of community college students to four-year institutional students, both
of whom were enrolled in a college general biology program (GS 101,
102, 103) during the 1967-68 academic year. During the week of
May 27, 1968 measurements were taken of...
The principal salinity extrema and extremum surfaces of the
world ocean are described by the analysis and plotting of data from
885 hydrographic stations in the three major oceans, the Southern
Ocean, and the American Mediterranean Sea. The distributions of
salinity, temperature, depth, and density along the extremum surfaces,
plotted...
The purpose of this investigation was to evaluate the effects of
a six week residential summer program of differential education for
gifted high school students. It was designed to determine the extent
to which participants in the program were proficient in aspects of
critical and creative thinking, and in the...
Single-strain cultures of Streptococcus cremoris, Streptococcus
lactis, Streptococcus diacetilactis, and Leuconostoc citrovorum produced
little or no acetone and no dimethyl sulfide when grown in milk
culture. These organisms had little or no ability to decarboxylate
antexogenous source of acetoacetic acid nor were they capable of
producing dimethyl sulfide from methyl...
Malonaldehyde, a three carbon dialdehyde, is one of the numerous
carbonyl compounds associated with oxidative deterioration of
food lipids. It is assumed to be formed as a product of lipid autoxidation
occurring according to the generally accepted free radical
mechanism. This compound is of great interest because of its potential...