Index Catalog // ScholarsArchive@OSU

Role of Trichodesmium spp. in the productivity of the subtropical North Pacific Ocean

Creator:: Letelier, Ricardo M. and Karl, David M.
Abstract:: The concentrations of filamentous diazotroph Trichodesmium spp., present as free trichomes and in colonial assemblages, were measured at approximately monthly intervals at Stn ALOHA (22°45'N, 158°00'W) between October 1989 and December 1992. The average abundance of filaments in the upper 45 m of the water column was highly variable ranging...
Resource Type:: Article
Full Text:: subtropical North Pacific Ocean Ricardo M. L e t e l i e r l . * , David M. ~ a r l ~ ' co l lege of

Trichodesmium spp. physiology and nutrient fluxes in the North Pacific subtropical gyre

Creator:: Letelier, Ricardo M. and Karl, David M.
Abstract:: The potential role of the diazotrophic cyanobacterium Trichodesmium spp. In nitrogen and phosphorus dynamics of the euphotic zone of the North Pacific subtropical gyre was investigated as one component of the Hawaii Ocean Time-series (HOT) program. Experiments were conducted with natural samples collected at Stn ALOHA (22° 45’ N, 158°...
Resource Type:: Article

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

Creator:: Murphy, Alice M.
Resource Type:: Masters Thesis
Full Text:: , Tim Cowles. Thanks also to my committee members, Ricardo Letelier, Dan Shafer, and Jeriy Heidel

The role of dissolved organic matter release in the productivity of the oligotrophic North Pacific Ocean

Creator:: Karl, David M., Hebel, Dale V., Björkman, K., and Letelier, Ricardo M.
Abstract:: Based on a long-term set of observations and measurements at a station in the subtropical North Pacific Ocean, it now appears that contemporaneous rates of primary production in low-nutrient open ocean regions and perhaps in the ocean as a whole may be greater than had been considered in field studies...
Resource Type:: Article
Full Text:: KARL, DAVID M., DALE V. HEBEL, K. BJÖRKMAN, AND R. M. LETELIER

Chlorophyll natural fluorescence response to upwelling events in the Southern Ocean

Creator:: Letelier, Ricardo M., Abbott, Mark R., and Karl, David M.
Abstract:: Variability of solar-induced (natural) fluorescence and chlorophyll were measured on scales of hours to weeks in the upper layer of a cyclonic eddy located south of the Antarctic Polar Front using a free-floating drifter. The fluorescence signal was analyzed both in terms of chlorophyll concentration and as an indicator of...
Resource Type:: Article

Temporal variability of phytoplankton community structure based on pigment analysis

Creator:: Letelier, Ricardo M., Bidigare, Robert R., Hebel, Dale V., Ondrusek, M., Winn, C. D., and Karl, David M.
Abstract:: Algal chlorophyll and carotenoid distributions were measured periodically in the euphotic zone of Sta. ALOHA (22º45′N, 158º00′W) between February 1989 and October 1991 to document the variability in phytoplankton abundance and composition. The annual mean depth-integrated (O-200 db) concentration of Chl a displayed significant interannual variability. Seasonal patterns in Chl...
Resource Type:: Article
Full Text:: LETELIER, R. M., R. R. BIDIGARE, D. V. HEBEL, M. ONDRUSEK, C. D

Numerical experiments on the effects of a meridional ridge on the transmission of energy by barotropic Rossby waves

Creator:: Matano, Ricardo P.
Abstract:: Analytical and numerical models are used to study the effects of a meridional ridge on the propagation of barotropic Rossby waves produced by distant wind stress forcing. The analytical model illustrates the qualitative aspects of the problem by solving a simplified form of the potential vorticity equation. The analytical results...
Resource Type:: Article

Optimization and computer control of batch retort process operations : conduction-heated foods

Creator:: Simpson-Rivera, Ricardo Jose
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Ricardo Jos6 Simpson-Rivera for

Frozen stabilized mince, its production, and thermophysical properties

Creator:: Simpson-Rivera, Ricardo Jose
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF Ricardo Simpson-Rivera for the

Seasonal variability in the Agulhas Retroflection region

Creator:: Matano, Ricardo P., Simionato, C. G., de Ruijter, W. P., van Leeween, P. J., Strub, P. Ted, Chelton, Dudley B., and Schlax, M. G.
Abstract:: The objective of this article is to present evidence for the existence of seasonal variability in sea surface height (SSH) anomaly in the Agulhas Retroflection region. TOPEX/POSEIDON altimeter data are used to estimate seasonal changes in the mesoscale SSH variability. There is a seasonal oscillation of SSH variability characterized by...
Resource Type:: Article

An overview of MODIS capabilities for ocean science observations

Creator:: Esaias, Wayne E., Abbott, Mark R., Barton, Ian, Brown, Otis B., Campbell, Janet W., Carder, Kendall L., Clark, Dennis K., Evans, Robert H., Hoge, Frank E., Gordon, Howard R., Balch, William M., Letelier, Richard, and Minnett, Peter J.
Abstract:: The Moderate Resolution Imaging Spectroradiometer (MODIS) will add a significant new capability for investigating the 70% of the Earth's surface that is covered by oceans, in addition to contributing to the continuation of a decadal scale time series necessary for climate change assessment in the oceans. Sensor capabilities of particular...
Resource Type:: Article
Full Text:: , Frank E. Hoge, Howard R. Gordon, William M. Balch, Richard Letelier, and Peter J. Minnett Abstract—The

Effect of an AIDS prevention program on the incidence of gonorrhea in enlisted men in the 105 Battalion of the Honduran Army

Creator:: Wall, Earl V.
Abstract:: This study evaluates the effect of an Acquired Immune Deficiency Syndrome (AIDS) prevention program on the incidence of gonorrhea among the enlisted men in the 105th Battalion of the Honduran Army. The education program was initiated as a result of the high incidence of AIDS in Honduras (more than half...
Resource Type:: Masters Thesis
Full Text:: the 105 Battalion of the Honduran Army Abstract approved: Annette M. Rossignol This study

Forestry theses accepted by colleges and universities in the United States : July 1981 - June 1990

Creator:: Fox, M. Anne, 1939-
Abstract:: This is a bibliography of doctoral dissertations and masters' theses in forestry and related topics issued during the period from July 1981 through June 1990. The colleges and universities included are all accredited by the Society of American Foresters. The actual listings were supplied by the individual institutions. Topics covered...
Resource Type:: Book
Full Text:: States July 19S1-June I99O Compiled by M. Anne Fclx Assisted by Anita M. DeWolfe BBLToGRAPHTc Senres

Fall applied ethephon and temperature effects on flower bud growth and ovule longevity in Prunus domestica

Creator:: Moreno-Simunovic, Yerko M.
Abstract:: In the Pacific Northwest some prune cultivars often exhibit inconsistent fruit set. Several factors have been associated with this characteristic. Temperature, genotype and boron content are among the most frequently mentioned. Studies were conducted to determine the effect of fall ethephon application on flower bud growth and ovule longevity in...
Resource Type:: Masters Thesis
Full Text:: want to express my appreciation to my friends Ricardo, Anita, Mauricio, Ricardo and Claudia. I

Calorimetric study of the respiratory metabolism of peach (Prunus persica L. Batsch.) seeds during stratification and its relationship to seedling growth

Creator:: Moreno-Simunovic, Yerko M.
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE THESIS OF Yerko M. Moreno-Simunovic for the

Minor and trace element chemistry of Lake Baikal, its tributaries, and surrounding hot springs

Creator:: Falkner, Kelly, Church, M., Measures, Chris I., LeBaron, G., Thouron, D., Jeandel, C., Stordal, M. C., Gill, G. A., Mortlock, R., Froelich, P., and Chan, L.-H.
Abstract:: A Russian–American fieldwork effort on Lake Baikal, its tributaries, and surrounding hot springs was undertaken in June–July 1991. Here we report on aspects of major ion (Ca2+, Mg2+, Na+, K+, Alk, Cl–, SO42–) and several minor and trace element (Li isotopes, Sr isotopes, Ba, Al, V, Cr, Ni, Cu, Ge,...
Resource Type:: Article
Full Text:: FALKNER, K. KENNISON, M. CHURCH, C. I. MEASURES, G. LEBARON, D

Dynamics of the nearshore wave bottom boundary layer

Creator:: Foster, Diane Lyn
Abstract:: This thesis presents an examination of the nearshore wave bottom boundary layer under conditions of significant sediment response. Using both field observations and simple models, the response of the bottom boundary layer to random waves is shown to have a complex behavior. First, the linearized wave bottom boundary layer governing...
Resource Type:: Dissertation
Full Text:: pestering), Nick Pisias, and Ricardo Letelier, (for their hallway bantering) and Jack Barth (for teaching

Annual cycles of organic matter and phytoplankton attributes in the Columbia and Willamette Rivers, with reference to the Columbia River Estuary

Creator:: Sullivan, Barbara Elaine
Resource Type:: Masters Thesis
Full Text:: Margaret Sparrow, Sandy Moore, Ricardo Letelier and Bruce Eversmeyer for all the laboratory assistance and

Physical-biological interactions in the Southern Ocean

Creator:: Moore, Jefferson Keith
Abstract:: Physical-biological interactions in the Southern Ocean were investigated using remote sensing data from several different satellite sensors. Satellite sea surface temperature data were used to study the dynamics of the Antarctic Polar Front (PF). Satellite ocean color data were used to estimate surface chlorophyll concentrations and their relation to various...
Resource Type:: Dissertation
Full Text:: sinks below 200 m depth [Deacon 1933, 1937, Orsi et al., 1995], South of Africa, the sub-surface and

Untangling the complexity of nearshore ecosystems : examining issues of scaling and variability in benthic communities

Creator:: Schoch, G. Carl
Abstract:: The objective of this research was to improve our understanding of how changes in the environment affect ecological processes. Change detection is often confounded by the large variation found in ecological data due to the difficulty of finding replicates in nature. Intertidal communities were chosen for studies of biophysical interactions...
Resource Type:: Dissertation
Full Text:: . The water sampling could not have been done without the courageous help of Ricardo Letelier, and

An ethnographic crossing : voices from the Latino community in Yamhill County, Oregon

Creator:: Nicklous, Nan Gilmore
Abstract:: Changing demographics in Oregon, accompanied by a rising Latino population, serve to dispel myths that we live in homogeneous, monolithic communities. Migration studies indicate migration is reshaping communities, contributing to ethnic diversity thus challenging our notion of identity and culture. Through the medium of oral histories and ethnography, this study...
Resource Type:: Masters Thesis

OSU theses and dissertations : 1983-1992

Creator:: Glenn, Judith A.
Abstract:: Departmental and author index of Masters' theses and doctoral dissertations accepted by the Graduate School.
Resource Type:: Book
Full Text:: Hastie, James D. Economic issues in assembling properties with eminent domain. 2 Ledeboer, M. Vivian. A

A market share analysis of U.S. demand for selected domestic and Mexican frozen vegetables

Creator:: Bechtel, Bruce A.
Abstract:: This study examines the link between policy-induced changes in the relative prices of Mexican and U.S. frozen vegetables and their shares of the U.S. market. Several scenarios were examined in order to assess the impacts on quantities demanded of both U.S. and Mexican produced frozen vegetables caused by changes in...
Resource Type:: Masters Thesis
Full Text:: Cited in Text Guadalajara JALI SCO M IC HOACAN NUEVO LEON Monterrey ZACATECAS AGUASCALIENTES

Scales of variability of bio-optical properties as observed from near-surface drifters

Creator:: Abbott, Mark R., Brink, Kenneth H., Booth, C. R., Blasco, Dolors, Swenson, Mark S., Davis, Curtiss O., and Codispoti, L. A.
Abstract:: A drifter equipped with bio-optical sensors and an automated water sampler was deployed in the California Current as part of the coastal transition zone program to study the biological, chemical, and physical dynamics of the meandering filaments. During deployments in 1987 and 1988, measurements were made of fluorescence, downwelling irradiance,...
Resource Type:: Article
Full Text:: automated water samplers, a drifter (drogue depth 13 m) was deployed once in 1987 and once in 1988. The

Scales of variability of bio-optical properties as obersved from near-surface drifters

Creator:: Abbott, Mark R., Brink, Kenneth H., Booth, C. R., Blasco, Dolors, Swenson, Mark S., Davis, Curtiss O., and Codispoti, L. A.
Abstract:: A drifter equipped with bio-optical sensors and an automated water sampler was deployed in the California Current as part of the coastal transition zone program to study the biological, chemical, and physical dynamics of the meandering filaments. During deployments in 1987 and 1988, measurements were made of fluorescence, downwelling irradiance,...
Resource Type:: Article
Full Text:: automated water samplers, a drifter (drogue depth 13 m) was deployed once in 1987 and once in 1988. The

Effects of propionibacterial metabolites on spoilage and pathogenic bacteria in dairy products

Creator:: Teo, Alex Yeow-Lim
Resource Type:: Masters Thesis
Full Text:: citrate in non-dairy MicrogardT m (MG)against Pseudomonas putida ATCC 12633. (a) sodium citrate controls

Modeling the Wind-Driven Variability of the South Indian Ocean

Creator:: Matano, R. P., Simionato, C. G., and Strub, P. T.
Abstract:: This article describes the results of numerical experiments carried out with a general circulation ocean model to investigate the effect of the seasonal cycle of the wind forcing on the Agulhas transport. Two cases are described. The first was initialized with temperature and salinity values obtained by horizontally averaging Levitus...
Resource Type:: Article
Full Text:: the Agulhas Current. Corresponding author address: Dr. Ricardo P. Matano, College of Oceanic and

Hydrothermal activity along the northern Mid-Atlantic Ridge and in the Bransfield Strait backarc basin, Antarctica

Creator:: Chin, Carol Sue
Resource Type:: Dissertation
Full Text:: depths as great as 3600 m. However, before the documentation of hydrothermal vents on the seafloor, the

Siletz Bay National Fish and Wildlife Refuge : environmental assessment

Creator:: Harrison, Ben and United States. Fish and Wildlife Service. Region 1
Abstract:: "The Service is proposing to establish the Siletz Bay National Fish and Wildlife Refuge by initially accepting a donation of 46 acres of salt marsh, acquiring up to 793 acres of land, and cooperatively managing 1,060 acres of tidelands with the State of Oregon... The primary need for the Service...
Resource Type:: Technical Report
Full Text:: NEWPORT, OREGON 97365 M!\Y 1 7 1990 DRAFT Environmental Assessment Proposed Siletz Bay National

Eddy–Mean Flow Interaction in Zonal Oceanic Jet Flow along Zonal Ridge Topography

Creator:: Witter, Donna L. and Chelton, Dudley B.
Abstract:: Motivated by satellite altimeter observations of enhanced sea level variability near steep topographic slopes in the Southern Ocean, effects of topography on the spatial distribution of mesoscale eddies and on eddy–mean flow interaction are investigated using a two-layer, wind-forced, quasigeostrophic channel model. The principal topography, a zonal ridge with a...
Resource Type:: Article
Full Text:: bathymetry (contours, ci 5 400 m) near the Australian–Antarctic Discordance south of Australia. and the

Mixing and heat transport mechanisms in the upper ocean in the Weddell Sea

Creator:: Robertson, Robin
Resource Type:: Dissertation
Full Text:: on its use. Other COAS professors, including Andrew Bennett, John Allen. Ricardo Matano, and Bob

Determinants of exports and foreign direct investment in the U.S. manufacturing sector

Creator:: Ma, Alyson C.
Resource Type:: Masters Thesis
Full Text:: Issues 3.1 Literature Review Through Ricardo, the importance of trade in increasing the home country's

The cyclical behaviors of agricultural farmland prices

Creator:: Cai, Deqin
Abstract:: This research studies the cyclical behavior of agricultural farmland prices in the United States with a special emphasis on how agricultural policies contribute to farmland price movement. The first stage of the study is to have a conceptual understanding of how agricultural policies affect the behavior of farmland prices. A...
Resource Type:: Dissertation
Full Text:: Ricardo and Von Thunen, they construct.a model to show that the farther away from the central market

Time-temperature effects on Cheddar cheese ripening : sensory and microbiological changes

Creator:: Kirby, Constance Lamb
Resource Type:: Masters Thesis
Full Text:: cooling as a process factor in cheese ripening 15 m. TEMPERATURE EFFECTS ON THE DEVELOPMENT OF

Experimental and mathematical procedures for the estimation of shelf-life : application to temperature-abused chilled seafood

Creator:: Almonacid-Merino, Sergio Felipe
Abstract:: The validation and potential use of mathematical models to estimate the shelf-life of refrigerated food exposed to temperature abuse and basing such estimations on microbial growth was analyzed. Combined heat transfer, microbial growth models, and non-parametric statistical procedures formed a computer-based predictive tool to assess shelf-life and estimate the accuracy...
Resource Type:: Masters Thesis
Full Text:: Food Science and Technology. I want to thank specially my friends Ricardo and Chock who in one way or

Results of the Eighteenth International Early Maturing Winter X Spring Wheat Screening Nursery (1995-1996)

Creator:: Oregon State University. Agricultural Experiment Station, International Maize and Wheat Improvement Center, and United States. Agency for International Development
Abstract:: This publication, Oregon Agricultural Experiment Station Special Report 974 reports the results of the 18th international early maturing winter x spring wheat screening nursery. It is identified as volume 18(2). Oregon Agricultural Experiment Station Special Report 973 is a companion publication, designated as volume 18(1) . It reports the results...
Resource Type:: Technical Report
Full Text:: /FVV771595G02 GRTPL85504//M 1223-3D-1D (MI76-77-S29)/ALD F12.71/COCHSERI VOR0/3/TOB/CNO67//ANZA/4/SERI PDGA

Distribution, seasonal variation and community structure of the demersal trawl fauna of Ragay Gulf, Philippines

Creator:: Jamir, Tomas Vergel C.
Resource Type:: Dissertation
Full Text:: ). These corresponds to regions shallower than 90 m, between 90 to 150 m, and deeper than 150 m

Analysis of needs-based proposal for a workshop on coastal resources management for specialists from Mexico and the US

Creator:: Hobgood, Nick
Abstract:: Building institutional and human capacity for integrated coastal zone management (ICZM) is increasingly recognized as critical to the future of sustainable development in coastal states. Agenda 21 of the UNCED conference has underscored the urgency of capacity building for ICZM as have other international bodies such as the North American...
Resource Type:: Capstone Project
Date Created:

Explaining divergence of service prices in developing countries

Creator:: Pakotiprapha, Sauwaluck
Abstract:: In explaining why service prices differ across countries (both developed and developing countries), most studies have paid attention to the role of structural variables such as population, trade balance, resource abundance etc., by using a full employment assumption. Due to the existence of high urban unemployment in developing countries, the...
Resource Type:: Dissertation

Fusion enhancement with neutron-rich radioactive beams

Creator:: Zyromski, Kristiana Elizabeth
Abstract:: Fusion reactions with radioactive neutron-rich projectiles have been the subject of much recent theoretical and experimental interest. Predictions of enhancement of the cross section due to the use of a neutron-rich projectile may have implications for synthesis of heavy nuclei. In this work, the fusion-fission excitation functions were measured for...
Resource Type:: Dissertation
Full Text:: , Dave Morrissey, Oleg Batenkov, George Souliotis, Ricardo Yanez, Ida Forsberg, Chris Powell, Maria

Factors influencing the effects of host diversity on plant disease epidemics for wheat stripe rust and potato late blight

Creator:: Garrett, Karen A.
Abstract:: Most studies of plant disease epidemiology have focused on epidemics in host populations composed of a single genotype. But crop plant diversity can be a useful means of improving the deployment of resistance genes. In a series of experiments with wheat stripe rust and potato late blight, we studied factors...
Resource Type:: Dissertation
Full Text:: Jorge Andrade, Carlos Canizares, Gabriela Chacon, Hugo Luna Vi1chez, Ricardo Orrego, Willmer Perez

Under the microscope: One hundred years of microbiology at Oregon State University

Creator:: Fisher, Jim
Resource Type:: Book
Full Text:: , Camille Partridge, Carlene Pelroy, Dr. William E. Sandine, Dr. Janine E. Trempy and Susan M. Williams

Results of the 19th International Early Maturing Winter X Spring Wheat Screening Nursery, (1997-1998)

Creator:: Oregon State University. Agricultural Experiment Station
Abstract:: Published February 1998. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Resource Type:: Technical Report
Full Text:: 940729 CER//YMH/HYS/3/PMF//CNO S/GLL 54 950921 P M F//C NO S/GLU5/I D#2619 55 940927 PMF//CNO S/GLU5

Results of the 20th International Early Maturing Winter X Spring Wheat Screening Nursery (1997-1998)

Creator:: Oregon State University. Agricultural Experiment Station, United States. Agency for International Development, and International Maize and Wheat Improvement Center
Abstract:: Published February 1999. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Resource Type:: Technical Report
Full Text:: . Length of Season Loc # Location M A M J JASON D J F M A M J J A Elev. (M) Latitude Longitude 9

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