Index Catalog // ScholarsArchive@OSU

Calanoid copepod diet in an upwelling system : phagotrophic protists vs. phytoplankton

Creator:: Fessenden, Lynne M.
Abstract:: Calanoid copepod diet was investigated in Oregon coastal waters to determine the trophic significance of phagotrophic protists as copepod prey within an ecosystem where the microplankton biomass is typically dominated by large diatoms. Prior to and during the 1991 upwelling season, clearance rates on phytoplankton and phagotrophic ciliates were measured...
Resource Type:: Dissertation
Full Text:: OF AUTHORS Dr. Timothy J. Cowles, serving as academic advisor, aided in interpretation of data and

Ecological interrelationships between summer resident gray whales (Eschrichtius robustus) and their prey, mysid shrimp (Holmesimysis sculpta and Neomysis rayi) along the central Oregon coast

Creator:: Newell, Carrie
Abstract:: The ecological interaction between the largest coastal predator, the gray whale (Eschrichtius robustus) and the most abundant shallow water marcrozooplanktonic prey, mysids, were examined in a poorly-understood predator-prey relationship along the central Oregon coast. From 2002-2008, 83 seasonal gray whales were identified. These whales returned each year around Memorial Day...
Resource Type:: Masters Thesis
Full Text:: Oregon Coast Abstract approved: _________________________________ Timothy J. Cowles The

Phytoplankton fluorescence and survival below the euphotic zone in the California current system

Creator:: Murphy, Alice M.
Resource Type:: Masters Thesis
Full Text:: . Murphy and Timothy J. Cowles College of Oceanic and Atmospheric Sciences Oregon State University

The spectral backscattering properties of marine particles

Creator:: Whitmire, Amanda L.
Abstract:: The inherent and apparent optical properties of different ocean regimes are the basis for all optical remote sensing of the ocean. Ecological information derived from remote sensors therefore relies on having a detailed understanding of how particulate backscattering and absorption contribute to the bulk optical signal. The absorption characteristics of...
Resource Type:: Dissertation
Full Text:: approved: Timothy J. Cowles The inherent and apparent optical properties of different ocean

Relationships of in situ spectral absorption, pigment ratios and environmental parameters for phytoplankton assemblages in coastal waters

Creator:: Eisner, Lisa B.
Abstract:: In situ optical measurements of spectral absorption and beam attenuation provide information on the fine scale horizontal and vertical variations in phytoplankton pigments and other measures of phytoplankton photophysiology and ecology in coastal waters. Phytoplankton pigment ratios from discrete sample analyses with High Performance Liquid Chromatography were compared to in...
Resource Type:: Dissertation
Full Text:: : Timothy J. Cowles In situ optical measurements of spectral absorption and beam attenuation provide

Spatial structure of the physical and biological distributions across the Antarctic Polar Front in austral spring and summer

Creator:: Howard, Cidney
Abstract:: Mesoscale surveys to examine the relationship between the physical processes and biological response along the Antarctic Polar Front (PF) were conducted as part of the US JGOFS Southern Ocean Program during austral spring and summer 1997/98. Multiple crossings of the PF near 170° W, using a towed undulating instrument, provided...
Resource Type:: Masters Thesis
Full Text:: . Abstract approved: y J. Cowles Mesoscale surveys to examine the relationship between the physical

Comparing the hydrography and copepod community structure of the continental shelf ecosystems of Washington and Oregon, USA from 1998 to 2009 : can a single transect serve as an index of ocean conditions over a broader area?

Creator:: Lamb, Jesse F.
Abstract:: Bi-weekly sampling of zooplankton and environmental parameters was conducted along a cross-shelf transect off the coast of Newport, OR, USA (44.65°N) from 1996 to present. Results have demonstrated the feasibility of using copepod community structure as an early indicator of ecosystem response to seasonal and large scale environmental changes in...
Resource Type:: Masters Thesis
Full Text:: a Broader Area? Abstract approved: Timothy J. Cowles

The inherent optical properties of the oceans: from closure to prediction

Creator:: Barnard, Andrew Heath
Abstract:: Precise in situ measurement of the spectral absorption and scattering coefficients in several regions has revealed patterns in the distribution of the inherent optical properties on spatial scales that were previously unobtainable. The precision of the measurements was found to be consistent and unbiased across a variety of oceanic regimes...
Resource Type:: Dissertation
Full Text:: Optical Properties of the Oceans: from Closure to Prediction. Abstract approved: Timothy J. Cowles

Role of protist grazing in the Oregon upwelling system

Creator:: Neuer, Susanne
Resource Type:: Dissertation

The swimming behavior of the copepod Calanus marshallae under various food conditions

Creator:: Krefft, Kevin P.
Abstract:: How certain aspects of the swimming behavior of the copepod Calanus marshallae vary as a function of different food conditions of Thalassiosira weissflogii was examined. A two video camera recording and controlled food environment aquaria system were used to record long-term swimming behavior and to determine 3- dimensional swimming paths...
Resource Type:: Masters Thesis

Variability in mesoscale circulation and its effects on zooplankton distribution in the Northern California Current

Creator:: Keister, Julie Eileen
Abstract:: In eastern boundary current upwelling ecosystems, mesoscale circulation features such as eddies and upwelling filaments play a prominent role in the transfer of water and the associated plankton from the productive nearshore to the oligotrophic deep sea. The relationship between mesoscale circulation, zooplankton distributions, and the across-shelf transport of coastal...
Resource Type:: Dissertation
Full Text:: : ____________________________________________________ Timothy J. Cowles, William T. Peterson In eastern

The effects of physical parameters on the absorption coefficient of natural waters

Creator:: Pegau, W. Scott
Resource Type:: Dissertation
Full Text:: members of my committee, Dr. Timothy Cowles, Dr. Barry Sherr, and Dr. Robert Olson, their time and effort

Cytokinin oxidase activity from Phaseolus vulgaris L. cv. Great Northern callus tissues

Creator:: Chatfield, J. Mark
Abstract:: Cytokinin oxidase activity in callus tissues of Phaseolus vulgaris L. cv. Great Northern has been examined using an assay based on the oxidation of radioactively labeled N⁶ -(Δ² -isopentenyl) adenine (i⁶Ade) to adenine (Ade). Conditions for the quantitative extraction and assay of the enzyme have been established. The substrate specificity...
Resource Type:: Dissertation
Full Text:: Moore, Dr. TeMay Ching and Dr. Timothy Cowles for their positive criticisms and counsel. Special

Bio-physical interactions of small pelagic fish schools and zooplankton prey in the California Current System over multiple scales

Creator:: Kaltenberg, Amanda May
Abstract:: Small pelagic fish represent a critical trophic link between plankton and large predators in marine upwelling ecosystems such as the California Current System. Populations of these fish are highly variable over time and are characterized by extreme fluctuations in abundance, which have significant ecosystem impacts. The causes driving this instability...
Resource Type:: Dissertation
Full Text:: , Tim Cowles, Kipp Shearman, Lorenzo Ciannelli, and Peter Bottomley. Each one has provided unique

The Costa Rica Dome : a study of physics, zooplankton and blue whales

Creator:: Matteson, Robyn S.
Abstract:: At the Costa Rica Dome (CRD), upwelling associated with cyclonic circulation and the presence of a shallow thermocline support a highly productive biological habitat, exploited by marine fauna at several trophic levels. During January 2008, a cruise to the CRD by the R/V Pacific Storm was conducted to relocate blue...
Resource Type:: Masters Thesis
Full Text:: the members of my thesis committee: Bruce R. Mate, Kelly J. Benoit-Bird, Timothy Cowles and Staci

Silicon biogeochemistry in the open-ocean surface waters : insights from the Sargasso Sea and equatorial Pacific

Creator:: Krause, Jeffrey W.
Abstract:: Diatoms are a ubiquitous group of plankton responsible for 20-40% of oceanic primary production, and a higher fraction of organic matter export to the ocean interior. Diatoms actively transport dissolved inorganic silicon into their cells, and through the process of silicification (i.e. biogenic silica production) they build tough and intricate...
Resource Type:: Dissertation

Isolation and some properties of allergens from timothy pollen

Creator:: Malley, Arthur
Resource Type:: Dissertation
Full Text:: Isolation and Some Properties of Allergens from Timothy

Seconds to hour scale photosynthetic responses in marine microalgae

Creator:: Laney, Samuel R.
Abstract:: Our view of phytoplankton has historically revolved around their inability to control their location in space. The term phytoplankton itself underscores this particular difference between phytoplankton and their sessile terrestrial counterparts. Yet there are other differences between land plants and the phytoplankton that are perhaps equally important, beyond this sessile-planktonic...
Resource Type:: Dissertation
Full Text:: : Pat Wheeler, Ron Zaneveld, and Tim Cowles from COAS, Tom Plant from Electrical Engineering and

A comparative study of prenatal behavior ontogeny in altricial and precocial murid rodents

Creator:: Robinson, Scott R., 1952-
Abstract:: Using techniques that permit the direct observation of fetuses in vivo, prenatal behavioral development was compared among four species in the rodent family Muridae: the Norway rat (Rattus norvegicus), Mongolian gerbil (Meriones unguiculatus), cotton rat (Sigmodon hispidus), and spiny mouse (Acomys cahirinus). Rattus and Meriones bear altricial offspring, as do...
Resource Type:: Dissertation
Full Text:: . Blaustein (Zoology), Dr. Timothy J. Cowles (Oceanography), and especially Dr. John A. Ruben (Zoology

Some properties of ribonucleotide reductase in Rhizobium species

Creator:: Cowles, Joe Richard, 1941-
Abstract:: Ribonucleotide reductase from Rhizobium meliloti has been partially purified and characterized. The enzymatic reduction of ribonucleotides to deoxyribonucleotides is dependent upon B₁₂ coenzyme and dihydrolipoate. B₁₂ coenzyme was more effective than B₁₂ coenzyme analogues in the reductase reaction. The affinity of the R. meliloti reductase system for B₁₂ coenzyme was...
Resource Type:: Dissertation
Full Text:: species AN ABSTRACT OF THE THESIS OF JOE RICHARD COWLES (Name) BOTANY in (PLANT PHYSIOLOGY) (Major

Chemical Control of McDaniel Mite Tetranychus mcdanieli Koch in Timothy Hay

Creator:: Waters, Timothy D., Ferguson, Holly J., Wight, Ronald P., and Walsh, Douglas B.
Resource Type:: Conference Proceeding
Full Text:: Chemical Control of McDaniel Mite Tetranychus mcdanieli Koch in Timothy Hay . Waters, T. D., H.J

The Oregon Tooth Journey : developing a researched-centered community engagement project to improve childhood dental health and education throughout Oregon

Creator:: Cowles, Emily A.
Abstract:: Childhood tooth decay is a prevalent and concerning public health issue that is often misunderstood or dismissed. In Oregon specifically, over 50% of children have experienced at least one instance of tooth decay and these rates are even higher for marginalized communities such as children living in poverty, children of...
Resource Type:: Honors College Thesis
Full Text:: Education Throughout Oregon by Emily Alice Cowles A THESIS submitted to Oregon State University Honors

A study of predation on Notoplana acticola Boone, 1929 and Cucumaria curata Cowles, 1907 in mussel beds using a serological technique

Creator:: Kent, Bretton Wayne
Resource Type:: Masters Thesis
Full Text:: and Cucumaria curata Cowles, 1907 in mussel beds using a serological technique Best scan available

Effects of fiber electrostatic cling and moisture regain on Timothy grass pollen attraction

Creator:: Vaughn, Reyna J.
Abstract:: People will spend a large amount of their lifetime indoors where the air is filled with both indoor and outdoor allergens. Exposure to allergens can have a range of effects on the health of building occupants. Textiles make up a vast majority of the surfaces, such as draperies, sofas, pillows,...
Resource Type:: Masters Thesis
Full Text:: Timothy Grass Pollen Attraction AN ABSTRACT OF THE THESIS OF Reyna J. Vaughn for the degree of

Zooplankton variability in the California current, 1951-1982

Creator:: Roesler, Collin Stevens
Resource Type:: Masters Thesis
Full Text:: advisors, Dudley Chelton and Tim Cowles for helping me to bridge the gap between physics and biology

The effects of timber harvest and herbivory on understory vegetation and composition of beef cattle diets on forested rangelands

Creator:: Walburger, Kenric J.
Abstract:: The objectives of the experiment were to: 1) determine the relationship between overstory canopy cover and ungulate herbivory on understory production composition and diversity and 2) determine the effects of timber harvest, ungulate herbivory and season of use on botanical composition and nutritional quality of beef cattle diets. Three randomly...
Resource Type:: Dissertation
Full Text:: in Northeastern Oregon. Kenric J. Wa/burger,' Timothy De/Curto,2 and Martin Vavr Authors are: 1

Effects of forage quality and type of protein supplement on intake and digestibility in beef steers and performance of postpartum beef cows

Creator:: White, Jenny J.
Abstract:: Two experiments were conducted to evaluate the effects of forage quality and supplemental undegradable intake protein (UIP) level on intake, digestibility, and performance of beef cattle. In Exp. 1, five ruminally cannulated steers (BW = 456 ± 6 kg) were used in a 6 x 5 incomplete Latin square with...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Jenny J. White for the degree of

Influence of age, condition, nutrition and season on serum and urine chemistry in Rocky Mountain elk

Creator:: Quinlan-Murphy, Lonnie J.
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Lonnie J. Quinlan-Murphy for the

The Case of the Holey Corms: Hey, What’s Eating Your Timothy Hay

Creator:: Bush, M. R. and Landolt, Peter J.
Resource Type:: Conference Proceeding
Full Text:: HOLEY CORMS: Hey, What’s Eating Your Timothy Hay M.R. Bush and P. J. Landolt WA State University

Do vigorous young forests reduce streamflow? Results from up to 54 years of streamflow records in eight paired-watershed experiments in the H. J. Andrews and South Umpqua Experimental Forests

Creator:: Perry, Timothy D.
Abstract:: This study quantified the magnitude and timing of summer streamflow deficits in paired-watershed experiments in the Cascade Range of Oregon where mature and old-growth conifer forests were subjected to clearcutting, patch cutting, and overstory thinning treatments in the 1960s and 1970s. Hydrologic effects of clearcutting, small-patch cutting, and overstory thinning...
Resource Type:: Masters Thesis
Full Text:: OF THE THESIS OF Timothy D. Perry for the degree of Master of Science in Geography presented

An econometric analysis of the demand for selected agricultural inputs in Oregon

Creator:: Yadav, Ram Prakash
Abstract:: The objective of this study is to analyze empirically the demand structure for the following important farm production inputs in Oregon: hired labor, chemical fertilizer, farm machinery, repairs and operating costs of motor vehicles and other machinery designated as "machinery supplies," purchased feed and miscellaneous inputs. Twenty-year data (1950-69 except...
Resource Type:: Masters Thesis
Full Text:: graduate committee, Dr. Timothy Hammonds, who introduced me to econometrics in the classroom and who

High resolution paleoclimatology from the varved sediments of the Gulf of California

Creator:: Baumgartner, Timothy Robert
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF Timothy R. Baumartner for the

A parallel implementation of the multiple polynomial quadratic sieve

Creator:: Perkins, Virgina E.
Abstract:: Cryptographic systems are used for secure communications in the government, in industry, and by individuals. Many cryptographic systems base their security on our inability to factor quickly. For this reason, in the last few decades several fast factoring algorithms have been developed. The Quadratic Sieve is one of the best...
Resource Type:: Capstone Project
Full Text:: ) • . J •• A Parallel Implementation of the Multiple

The influence of herbivore generated inputs on nutrient cycling and soil processes in a lower montane tropical rain forest of Puerto Rico

Creator:: Fonte, Steven J.
Abstract:: The role of insect herbivores in the nutrient cycling dynamics of forest ecosystems remains poorly understood. Although past research in herbivory has focused primarily on the deleterious effects that insects can have on tree growth and mortality, the overall effects of herbivory are more complex. Herbivores have the potential to...
Resource Type:: Masters Thesis
Full Text:: Disturbance in a Tropical Forest Ecosystem Steven J. Fonte and Timothy D. Schowalter Keywords: litterfall

Process communication through Proxy Pipe

Creator:: Chen, Shuping
Abstract:: Proxy Pipe is designed to be a bus in the transport layer of the communication between the two different processes. Its major function is to transfer bytes. When the client process tries to send a command to the server process, it will talk to a proxy as if it were...
Resource Type:: Capstone Project
Full Text:: Chen Department of Computer Science S(;ptember l 7, l 999 Ma_jo: P~0fessor: Dr. Timothy Budd

Factors influencing diet composition of beef cattle grazing mixed conifer mountain riparian areas

Creator:: Darambazar, Enkhjargal
Abstract:: Two trials were conducted to evaluate changes in the quantity, quality, and moisture of available forage in the pasture, and shrub utilization by cattle during a 30-d late summer grazing period (Trial 1) and the effect of cow age (experience) on grazing distribution and diet composition (Trial 2) in mountain...
Resource Type:: Masters Thesis
Full Text:: : Timothy Two trials were conducted to evaluate changes in the quantity, quality, and moisture of available

Grass straw residues as a feed source for wintering beef cattle

Creator:: Stamm, Michele M.
Resource Type:: Masters Thesis
Full Text:: Cattle Abstract approved: Redacted for Privacy Dr. Timothy E4ICurto A survey was conducted during the

The influence of supplemental alfalfa quality on the intake and utilization of low-quality roughages by beef cattle

Creator:: Weder, Christoph E.
Abstract:: Three experiments were conducted to evaluate the influence of quality of supplemental alfalfa quality on beef cattle consuming low-quality meadow grass (MG) roughages. Fifteen steers (250 kg) were assigned randomly to one of three treatments: 1) meadow grass (5.2% CP), no supplement (MNS); 2) meadow grass plus high quality alfalfa...
Resource Type:: Masters Thesis
Full Text:: approved: Timothy DelCurto Three experiments were conducted to evaluate the influence of quality of

Nutritional and managerial considerations for wintering beef cattle in the northern Great Basin

Creator:: Brandyberry, Steven D.
Abstract:: A study was conducted to determine effects of year and season on diet quality of beef cattle grazing northern Great Basin rangelands from 1990 to 1993. Forage quality was high early in the growing season, then declined as seasons progressed (P<.05). Plant chemical composition was higher early in the growing...
Resource Type:: Dissertation
Full Text:: little bluestem, timothy (Phleum pratense), bluegrasses, ryegrass (Lolium spp.) and orchardgrass

Influence of previous cattle and elk grazing on the subsequent diet quality and nutrient intake rate of cattle, deer, and elk grazing late-summer mixed-conifer rangelands

Creator:: Damiran, Daalkhaijav
Abstract:: Four studies were conducted on late-summer diet quality and quantity of cattle (Bos taurus), mule deer (Odocoileus hemionus hemionus), and elk (Cervus elaphus) in response to prior grazing by cattle and elk on mixed-conifer rangelands and on related research techniques. In our first study we assessed a photographic technique to...
Resource Type:: Dissertation
Full Text:: , and Elk Grazing Late-Summer Mixed- Conifer Rangelands. Abstract approved: Timothy DelCurto

Management of stockpiled forages and optimal use of supplements by beef cattle while consuming low-quality forages

Creator:: Suverly, Norman A.
Abstract:: Three studies were conducted to evaluate: 1) rotationally grazed forage for late-summer stockpiling; 2) effects of lactation on self-fed supplement intake; and 3) influence of cow age on hand-fed supplement intake. For the first study, treatments consisted of non grazed, 2X and 3X grazed. Crude protein of forage grazed 3X...
Resource Type:: Masters Thesis
Full Text:: Forages Abstract approved: Timothy DelCurto Three studies were conducted to evaluate: 1

Quantities of prostaglandins in whole and extended bovine semen and their potential effect on fertility following insemination

Creator:: Jaeger, John Ralph
Abstract:: Our objectives were to determine 1) the concentration of prostaglandin F2α (PGF2α) in whole and extended bovine semen, 2) if concentrations of prostaglandins in extended bovine semen are correlated to fertility, and 3) if PGF2α administered at the time of artificial insemination would improve conception rate. Concentration of PGF2α tended...
Resource Type:: Dissertation
Full Text:: : Timothy DelCurto Our objectives were to determine 1) the concentration of prostaglandin F2α (PGF2α

The influence of cow age on grazing distribution and utilization of mountain riparian areas and adjacent uplands

Creator:: Morrison, Julie A.
Abstract:: The objective of this study was to evaluate the influence of cow age on grazing distribution relative to mountain riparian areas. In each of two years, sixty cow-calf pairs were stratified by age into the following treatments: 1) thirty first calf heifers (442 kg, body condition score (BCS)=4.5), and 2)...
Resource Type:: Masters Thesis

The role of processors in the improvement and expansion of fruit crop production in the western state of Nigeria ; a case study

Creator:: Olufokunbi, Banwo
Abstract:: Four assumptions-- 1. That there is an effective and potential demand for processed fruit products in the Western State of Nigeria. 2. That current supply of raw materials in the Western State of Nigeria is more than sufficient to meet the increased demand which the short-term addition or expansion (or...
Resource Type:: Masters Thesis
Full Text:: - cJjolnd lvO\J< I ITcJ- (Major) (Date) Title: THE ROLE OF PROCESSORS IN THE IMPROVEMENT AND

Bioenergetics of Rock Climbing

Creator:: Collier, Casey
Abstract:: This study will use a COSMED K5 portable metabolic unit to expand on the limited knowledge of the energy demands of top rope rock climbing. Participants will be experienced, consistent rock climbers. Two route difficulties (5.8 and 5.10) will be analyzed using a repeated measures randomized design to determine differences...
Resource Type:: Honors College Thesis
Full Text:: : ___________________________________________________________________________ Timothy Burnett Background: Abstract This study will use a COSMED K5 portable metabolic

Influence of stocking density on grazing beef cattle performance, diet composition foraging efficiency, and diet quality on a late-spring early-summer native bunchgrass prairie

Creator:: Wyffels, Samuel A.
Abstract:: This study evaluated the influence of cattle stocking density on botanical composition of diet, diet preference, and cattle performance on the Zumwalt Prairie in Northeastern Oregon. In each of two years, 192 cow-calf pairs (549.27 kg, BCS = 4.89) and 48 yearling heifers (383.34 kg, BCS = 5.02) were stratified...
Resource Type:: Masters Thesis
Full Text:: Early- Summer Native Bunchgrass Prairie. Abstract approved: Timothy DelCurto ABSTRACT

Early macronutrient uptake and partitioning in Glycine max L. Merr

Creator:: Schuttler, Patti L.
Abstract:: Soybeans were grown in hydroponic solutions and in perlite to devise procedures to measure plant mineral accumulation and solution depletion over time. Electron emission spectrometry and micro-Kjeldahl-autoanalyzer analytic techniques were used to monitor mineral content of individual plants and their corresponding solutions. An automated computer assisted system of converting raw...
Resource Type:: Masters Thesis
Full Text:: UPTAKE AND PARTITIONING IN GLYCINE MAX L. Merr. Abstract approved: n. i i. ~ •y "*''' ' —1 K—i J

Chilling and nutritional requirements of fruit trees in Yemen

Creator:: Alkoshab, Othman
Abstract:: A portion of this study was initiated to provide the basis for implementing a chill unit accumulation procedure in Yemen. Most continuous or daily minimum, maximum temperature models severely underestimated chilling units, and slight modifications offered little improvement for the complex models. Only the Crossa Raynaud formula approximated generally accepted...
Resource Type:: Dissertation
Full Text:: steering me into new heights of science and research is Dr. Timothy L. Righetti. He provided me with

Larval settlement and juvenile group dynamics in the domino damselfish (Dascyllus albisella)

Creator:: Booth, David J. (David John), 1958-
Abstract:: Patterns of settlement of larvae and population dynamics of juveniles are poorly known for coral reef fishes. During 1987 to 1989, I studied these phenomena in the domino damselfish (Dascyllus albisella), a species endemic to the Hawaiian Islands. Larvae settle onto branching coral heads as new recruits (10-15 mm in...
Resource Type:: Dissertation
Full Text:: domino damselfish (Dascyllus albisella) AN ABSTRACT OF THE THESIS OF David J. Booth for the degree of

Influence of geotextile permeability on stability of rubble shore protection structures

Creator:: Dodson, Timothy Joe
Abstract:: The effect of geotextile permeability on the stability of rubble shore protection structures was investigated by conducting large-scale wave tank tests on a revetment. Pore pressure within the sandy gravel core of the revetment were measured in one phase of the experiment, and stability of armor units on the structure...
Resource Type:: Masters Thesis
Full Text:: rubble shore protection structures AN ABSTRACT OF THE THESIS OF Timothy Joe Dodson for the degree of

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