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  • Soil mounds and patterned ground of the Lawrence Memorial Grassland Preserve

    Creator:
    Johnson, Colleen Burch
    Abstract:
    The Lawrence Memorial Grassland Preserve, located in Wasco County, Oregon, exhibits a wide variety of soil mounds and patterned ground features. The size, shape, and distribution of several elements of this peculiar landscape were analyzed with a detailed map, field observations, and statistical procedures. Common soil mound shapes are circular,...
    Resource Type:
    Capstone Project
    Full Text:
    ?SSLAND PRESVE by COLLEEN BURCH JOHNSON A RESEARCH PAP sunitted to THE DEPARTMENT OF GEOGRAPHY ii

  • Karl Jordan : a life in systematics

    Creator:
    Johnson, Kristin Renee
    Abstract:
    Karl Jordan (1861-1959) was an extraordinarily productive entomologist who influenced the development of systematics, entomology, and naturalists' theoretical framework as well as their practice. He has been a figure in existing accounts of the naturalist tradition between 1890 and 1940 that have defended the relative contribution of naturalists to the...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Kristin Renee Johnson for

  • Planktivorous Auklets (Aethia pusilla and A. cristatella) nesting on St. Lawrence Island, Alaska as indicators of marine conditions in the northern Bering Sea

    Creator:
    Gall, Adrian
    Abstract:
    Monitoring reproductive success, prey species composition, and colony size of marine birds has been proposed as a method of assessing changes in marine systems that are otherwise difficult to sample (Cairns 1987). I measured inter-annual and intra-seasonal variability in reproductive parameters, taxonomic composition of the diet, and adult body condition...
    Resource Type:
    Masters Thesis
    Full Text:
    cristatella and A. Dusilla) Nesting on St. Lawrence Island. Alaska as Indicators of Marine Conditions in the

  • How do engineering students develop and reason with concepts of electricity within a project-based course?

    Creator:
    Bledsoe, Karen E.
    Abstract:
    Reform in science education has often emphasized task-based learning as an instructional method to improve student understanding and retention of concepts, and to promote the development of reasoning and problem-solving. Yet studies assessing student knowledge at the beginning and end of a task-based class show mixed results. Students in task-based...
    Resource Type:
    Dissertation
    Full Text:
    : _________________________________ Lawrence B. Flick Reform in science education has often emphasized task-based

  • Detecting medusahead (Taeniatherum caput-medusae (L.) Nevski) using high frequency, sequential, globally positioned digital images

    Creator:
    Ndzeidze, Stephen Koghan
    Abstract:
    Invasive plant species are expanding and transforming vegetative communities across Oregon and throughout the United States. Over the past three decades remote sensing, geographic information system (GIS), and Global Positioning System (GPS) technologies have been integrated to detect and map the distribution of noxious rangeland plants. This study developed low-cost...
    Resource Type:
    Dissertation
    Full Text:
    , Globally Positioned Digital Images Abstract approved: Douglas E. Johnson Invasive plant

  • The Role of Community Cultural Wealth in the Retention of Latino/a Students in the Community College Setting

    Creator:
    Reeder, Jane F.
    Abstract:
    Background. Many studies addressing the reasons why minority students fail in higher education are based on what is defined as a deficit model. A deficit model documents that a significant number of minority students fail because their culture is distinct from that of the majority population. Numerous minority students do...
    Resource Type:
    Dissertation
    Full Text:
    : ______________________________________________________ Earl P Johnson Abstract Background. Many studies addressing the reasons why minority

  • The use of NAEP data in a state context

    Creator:
    Ha, Jung-Mi
    Abstract:
    The National Assessment of Educational Progress (NAEP) has measured the condition and progress of education since 1969 to provide information on performance of American students in core subjects to policymakers, educators, and the public. Yet, there has been a perception that theses federal resources are under utilized. An analysis of...
    Resource Type:
    Dissertation
    Full Text:
    approved: __________________________________ Lawrence B. Flick The National Assessment of

  • Assessing mechanisms of immunotoxicity for polycyclic aromatic hydrocarbons in rainbow trout (Oncorhynchus mykiss)

    Creator:
    Bravo, Claudia F.
    Abstract:
    During the past 30 years, numerous studies have focused on the toxicities of polycyclic aromatic hydrocarbons (PAH). Laboratory and field studies have helped elucidate the detrimental effects of these chemicals on growth, reproduction and immune response. Polycyclic aromatic hydrocarbons are in the priority list of chemicals to be studied by...
    Resource Type:
    Dissertation
    Full Text:
    ) Abstract approved: Lawrence R. Curtis During the past 30 years, numerous studies have focused on the

  • Alteration of cholesterol disposition by chlordecone is not explained by induction of cyp7a or cyp4a1

    Creator:
    Lee, JungA
    Abstract:
    Liver X receptor (LXR), farnesoid X receptor (FXR) and peroxisome proliferator-activated receptor (PPAR) are adopted orphan nuclear receptors that function as lipid sensors. These receptors respond to cellular lipid levels and regulate the expression of target gene. Previously, it was demonstrated that low doses of chlordecone (CD) pretreatment disturbed exogenous...
    Resource Type:
    Masters Thesis
    Full Text:
    Chiordecone Is Not Explained b Induction of Cyp7a or Cyp4al Abstract approved: Lawrence R. Curtis Liver X

  • Vitellogenesis : a biomarker for estrogenic and antiestrogenic effects of organochlorines in rainbow trout

    Creator:
    Donohoe, Regina M.
    Abstract:
    Persistent organochlorines (OCs) bioaccumulate in aquatic biota and potentially impair reproduction via endocrine disruption. The present research evaluated estrogenic effects of the OCs, chlordecone (CD) and o,p'-DDT/DDE, and the antiestrogenicity of 3,4,5,3',4',5'-hexachlorobiphenyl (345-HCB) in juvenile rainbow trout, utilizing vitellogenesis as a biomarker. Vitellogenesis, estrogen regulated hepatic production of the yolk...
    Resource Type:
    Dissertation
    Full Text:
    . Lawrence R. Curtis Persistent organochlorines (OCs) bioaccumulate in aquatic biota and potentially impair