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  • Taxomony and mycorrhizal ecology of the desert truffles in the genus Terfezia

    Creator:
    Alsheikh, Abdulmagid M.
    Abstract:
    Mycorrhizal fungi in arid and semiarid rangelands have received little study in southwest Asia and north Africa, although they are important in food production and rangeland productivity. The desert truffles of the genera Terfezia and Tirmania form fruiting-bodies and mycorrhizae with rangeland plants. This thesis treats the taxonomy and the...
    Resource Type:
    Dissertation
    Full Text:
    . William Denison, William Chilcote and Robert Linderman for their guidance and support, and for serving

  • Studies on canker in European filbert caused by Anisogramma anomala

    Creator:
    Postman, Joseph D.
    Abstract:
    Anisogramma anomala causes a stem canker of filberts, Corylus avellana. This disease became a threat to the main U.S. filbert growing region when it was introduced into the Pacific Northwest around 1968. Various methods of artificially inoculating filbert trees and seeds were explored. Less than 1% of potted filbert trees...
    Resource Type:
    Masters Thesis
    Full Text:
    , and to acknowledge funding provided by the Oregon Filbert Commission. Thanks to Dr. William Denison

  • Nitrogen fertilizer rate and application timing effects on growth and seed-oil yield of meadowfoam

    Creator:
    McGahuey, Michael L.
    Abstract:
    Meadowfoam has been identified as a potential oilseed crop for production on poorly drained soils in areas with cool, moist winters. The effects of N fertilizer on meadowfoam (Limnanthes alba Benth.) have been studied in Oregon and Maryland, but the results have not been consistent with respect to the effects...
    Resource Type:
    Masters Thesis
    Full Text:
    Science; and, Dr. William Denison, Graduate School Representative. Special thanks are owed to Dr. Ken

  • Graphing calculators in college calculus : an examination of teachers' conceptions and instructional practice

    Creator:
    Barton, Susan Dale
    Abstract:
    The study examined classroom instructional practices and teacher's professed conceptions about teaching and learning college calculus in relationship to the implementation of scientific-programmable-graphics (SPG) calculators. The study occurred at a university not affiliated with any reform project. The participants were not the catalysts seeking to implement calculus reform, but expressed...
    Resource Type:
    Dissertation
    Full Text:
    committee, Dr. William Denison, Dr. Thomas Dick, Dr. Dianne Erickson, Dr. Margaret Niess, and Dr. David

  • Composition of pectic substances in Selva strawberry (Fragaria x ananassa Duch.)

    Creator:
    Lin, Ben-lin
    Abstract:
    Pectic substances in the cell wall have long thought to be responsible for the textural changes in fruit during ripening and senescence. Compositional variation within the pectic macromolecules could affect the external characteristics of the fruit. Strawberries undergo adverse quality changes such as softening and juice loss after freezing and...
    Resource Type:
    Masters Thesis
    Full Text:
    MacDonald, Michael Hudson, and William Denison for their academic input. Thanks to the following persons

  • The estimation and significance of sapwood basal area in young Douglas-fir stands

    Creator:
    Dolan, Linda Sutliff
    Abstract:
    The relationship of sapwood basal area to basal area was examined on stands of young-growth Douglas-fir. Through non-destructive sampling, sapwood basal area was quantified on four different thinning intensities and one control (unthinned) treatment. Emphasis was on testing a sampling method and evaluating variations in the sapwood component as a...
    Resource Type:
    Masters Thesis

  • Soil fungal hyphal dynamics and seasonal hypogeous sporocarp production in western Oregon Douglas-fir forests

    Creator:
    Hunt, Gary, 1945-
    Abstract:
    Total length and biomass of fungal mycelium in the soil of a young Douglas-fir stand in the central Oregon Coast Range were estimated over 27 months with the agar-film technique. In a second study, phenology and taxonomy of hypogeous (belowground) sporocarps were studied over 32 months in a nearby, young...
    Resource Type:
    Dissertation
    Full Text:
    committee for their guidance and advice: Drs. William Denison, William Chilcote, David Perry, Kermit

  • RFLP analyses of interspecific hybrids of Phaseolus

    Creator:
    Kuo, Mei
    Abstract:
    Gene transfer via interspecific hybridization within Phaseolus has been limited by abnormal hybrid development and the rapid loss of hybridity in subsequent generations. The most advanced embryo development occurs in P. vulgaris x P. coccineus where mature seeds form. However, the reciprocal cross still results in abnormal embryos unable to...
    Resource Type:
    Dissertation
    Full Text:
    . My sincere appreciation is extended to Drs. William Denison, Steve Knapp, William Proebsting, Steve

  • Responses of algal populations to parasitism by Aphelidium chlorococcarum and chytrids in an Oregon sewage lagoon

    Creator:
    Woods, Wendy W.
    Abstract:
    The abundance of algal species and their parasites was monitored weekly for two years in a sewage lagoon at the Corvallis Airport, Oregon. During the cooler months, Euglena species were dominant followed by a Chlamydomonas assemblage in the spring and a predominantly Scenedesmus assemblage in the summer and fall. Parasites...
    Resource Type:
    Dissertation
    Full Text:
    . Thanks also to the other members of my committee: Peter Bottomley, William Denison, JoAnn Leong, Ralph

  • Studies to improve lactic acid bacterial starter cultures

    Creator:
    Khosravi, Lewa
    Abstract:
    Three commercial sausage starter cultures were grown in an internal-pH-controlled medium (PHASE 4) and in a soluble phosphate-buffered medium. The cultures were tested by comparing viable counts before and after freezing at -40 C or freeze-drying and subsequent storage for 3 months in the frozen or dried state. Strains varied...
    Resource Type:
    Dissertation
    Full Text:
    . Stephen Kaattari, Prof. Floyd W. Bodyfelt, Dr. Donald E. Mattson , Dr. William C. Denison and Dr