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  • Evaluation of popcorn cultivars as resistant rotation crops to Columbia root-knot nematode : A systems approach

    Creator:
    Cardwell, Derek
    Abstract:
    This study examined the management situation for the Columbiaroot-knot nematode (Meloidogyne chitwoodi) in potato, using an approach with systems thinking and interactive meetings. The focus of current research for control of this nematode was evaluated. Control practices include crop rotation, and this study also evaluated popcorn cultivars for their potential...
    Resource Type:
    Undergraduate Thesis

  • Floodplain vegetation following over 80 years of intensive land use and de-watering : Lower Owens River, California

    Creator:
    Risso, Derek A.
    Abstract:
    Riparian areas in the arid western United States are critical ecosystems that have been severely degraded by a variety of land and water uses over the last 100 years. In this study, the composition and structure of floodplain vegetation along the Lower Owens River in eastern California was quantitatively described...
    Resource Type:
    Masters Thesis
    Full Text:
    AN ABSTRACT OF THE THESIS OF Derek A. Risso for the degree of Master of Science in Wildlife

  • Indirect effects of fishing on predators and their prey

    Creator:
    Stallings, Christopher Derek
    Abstract:
    Predators are fundamentally important for regulating and driving prey population dynamics as well as structuring ecological communities. Over-exploitation of marine resources has caused dramatic depletions of predatory fish species and shifts in marine community composition, with attendant declines in productivity and diversity of marine ecosystems. Despite the important ramifications of...
    Resource Type:
    Dissertation
    Full Text:
    !” I lovingly thank my family: Dan and Edna Reaves, Stan and Lillie Mae Stroud, Derek and Kristi

  • Hop bittering compounds and their impact on peak bitterness on lager beer

    Creator:
    Fritsch, Annette N.
    Abstract:
    Hop derived bitter compounds, including alpha-acids, reduced and non-reduced iso-alpha-acids, were evaluated for their contribution to peak bitter intensity in lager beer. Alpha-acids are the precursors to the major bittering components in beer (iso-alpha-acids). Typically, alpha-acids do not survive the brewing process, but if a product is dry-hopped, they may...
    Resource Type:
    Masters Thesis
    Full Text:
    Annette N. Fritsch for the degree of Master of Science in Food Science and Technology, presented on

  • A data-driven model of pedestrian movement

    Creator:
    Casburn, Ledah
    Abstract:
    This thesis presents a model for simulating individual pedestrian motion based on empirical data. The model keeps track of a pedestrian’s position, orientation, and body configuration and leverages motion capture data to generate plausible motion. Our model can automatically incorporate a pedestrian’s physical limitations when making movement decisions, since it...
    Resource Type:
    Masters Thesis

  • The link between nitrogen cycling and soil microbial community composition in forest soils of western Oregon

    Creator:
    Boyle, Stephanie A.
    Abstract:
    The objectives of this thesis were to examine the links between soil microbial community composition and function using the nitrogen (N) cycle as a model for these interactions and to assess the impact of environmental factors such as microclimate, vegetation type, and nutrient availability on microbial diversity and N transformations...
    Resource Type:
    Dissertation
    Full Text:
    examine the links between soil microbial community composition and function using the nitrogen (N) cycle

  • Semi-volatile fluorinated organic compounds in Asian and Pacific Northwestern U.S. air masses

    Creator:
    Piekarz, Arkadiusz M.
    Abstract:
    Current studies suggest that perfluorinated organic compounds, such as fluorotelomer alcohols (FtOHs) in the troposphere, may be precursors of perfluorocarboxylic acids and perfluorosulfonates in remote regions. Fluorinated organic compounds were investigated in archived extracts collected from remote locations in Okinawa, Japan (HSO) and Mount Bachelor, Oregon (MBO) during the springs...
    Resource Type:
    Masters Thesis
    Full Text:
    published literature. N-Ethyl 2 rn s anic 04 ted er perfluorooctane sulfonamide (N

  • Linkages among land use, riparian zones, and uptake and transformation of nitrate in stream ecosystems

    Creator:
    Sobota, Daniel J.
    Abstract:
    Land use alters the physical and biological structure of stream ecosystems and potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in abundance on the biosphere during the past century from human activities. In this dissertation, I quantified uptake and transformation of nitrate (NO₃⁻)...
    Resource Type:
    Dissertation
    Full Text:
    potentially alters their capacity to process nitrogen (N), an essential nutrient that has nearly doubled in

  • Geochemical cycling in a Pacific Northwest estuary (Tillamook Bay, Oregon, USA)

    Creator:
    Colbert, Debbie L.
    Abstract:
    This thesis investigates the behavior of major inorganic nutrients (P, N, Si), trace metals (Mn, Fe), and alkaline-earth metals (Ba) within Tillamook Bay over seasonal cycles and under a range of river discharge conditions from October 1997 through December 1999. Located in the Pacific Northwest region, Tillamook Bay is an...
    Resource Type:
    Dissertation
    Full Text:
    This thesis investigates the behavior of major inorganic nutrients (P, N, Si), trace metals (Mn, Fe

  • The structure of E6

    Creator:
    Wangberg, Aaron D.
    Abstract:
    A fundamental question related to any Lie algebra is to know its subalgebras. This is particularly true in the case of E6, an algebra which seems just large enough to contain the algebras which describe the fundamental forces in the Standard Model of particle physics. In this situation, the question...
    Resource Type:
    Dissertation
    Full Text:
    various subalgebras of the form sl(n,F) and su(n,F) within sl(3,O) and we also find algebras