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Filtering by: Creator Jeffreys, Bradford J. Remove constraint Creator: Jeffreys, Bradford J. Non-Academic Affiliation Oregon State University. Graduate School Remove constraint Non-Academic Affiliation: Oregon State University. Graduate School

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  • Studies on luteinizing hormone and gonadal steroids in male and female llamas (Lama glama)

    Creator:
    Reed, Pamela J.
    Abstract:
    A series of studies was performed to more clearly evaluate gonadal function in llamas. Luteinizing hormone (LH) and progesterone (P₄) concentrations were compared following natural or hormone-induced ovulation. Luteal regression was evaluated following administration of the prostaglandin F₂α analog cloprostenol. The interaction of age, season and castration on testosterone (T)...
    Resource Type:
    Dissertation
    Full Text:
    and female llamas (Lama glama) AN ABSTRACT OF THE THESIS OF Pamela J. Reed for the degree of Doctor

  • Reproductive endocrinology and vaginal cytology of the female llama (lama glama)

    Creator:
    Leon, Juan B.
    Abstract:
    Four studies were conducted in the llama (Lama glama) evaluating changes in reproductive physiology, vaginal cytology, and growth. Study I. Temporal changes in vaginal cytology were correlated with alterations in serum estradiol -17β and progesterone concentrations. A 2 * 2 factorial study examined the treatment effects of a) concurrent male...
    Resource Type:
    Dissertation
    Full Text:
    Foundation, a traves del Dr. J. Irving. Una profunda gratitud para mi querido amigo Dr. Paul Kifer. A Chris

  • The effect of 3,4,5,3',4',5'- hexachlorobiphenyl on plasma corticosterone and prolactin concentration in the mouse

    Creator:
    Youngberg, Jill Annette Meyer
    Abstract:
    It was hypothesized that alterations in plasma concentrations of corticosterone (CS) and prolactin (PRL) may be at least partially responsible for polychlorinated biphenyl (PCB)-induced immunosuppression. A 2 by 2 factorial experiment examined the interactions of PCB and P815, an allogeneic tumor, on plasma concentrations of CS and PRL, and on...
    Resource Type:
    Masters Thesis
    Full Text:
    Concentrations in the Mouse Abstract Approved: Redacted for Privacy (Bradford B. Smith) It was hypothesized

  • Biochemical and physiological indicators of behavioral impairment in salmonids exposed to chlorpyrifos and copper

    Creator:
    Sandahl, Jason
    Abstract:
    The purpose of this work was to determine if environmentally-relevant concentrations of chlorpyrifos and copper, two commonly detected chemicals in Western surface waters, can negatively impact the biological health of salmonids. Both compounds are highly neurotoxic to fish, but each with distinct biological target sites and mechanisms of action. We...
    Resource Type:
    Dissertation
    Full Text:
    Concentration Estimates for Acetyicholinesterase Inhibition. Jason F. Sandahi and Jeffrey J. Jenkins Oregon

  • Water relations in red and white clover seed crops

    Creator:
    Oliva, Ruben N.
    Abstract:
    Both red (Trifolium pratense L.) and white (Trifolium repens L.) clover seed yields can be highly variable and low in western Oregon. The objectives of this study were to: i) determine crop water requirements and supplemental irrigation timing, and ii) quantify the effects of soil and water status on inflorescence...
    Resource Type:
    Dissertation
    Full Text:
    to my major professor, Dr. Jeffrey J. Steiner, for his support and fine guidance. Thanks are also

  • Effect of nutrients on interactions between two decay fungi and Trichoderma harzianum Rifai on ponderosa pine sapwood wafers

    Creator:
    Canessa, Edwin
    Abstract:
    Small size wood assays were utilized to study the effect of added nutrients to the wood on the interactions of Trichoderma harzianum Rifai and two wood decay fungi, Trametes versicolor (white rot) and Gloeophyllum trabeum (brown rot). Weight losses related to time of exposure were monitored as a measure of...
    Resource Type:
    Dissertation
    Full Text:
    gratitude to Dr. Jeffrey Morrell for his guidance, advice and encouragement during the preparation of this

  • Limitations to Seedling Regeneration on Tropical Forest Restoration Plantations in Northern Thailand

    Creator:
    Sangsupan, Hathai A.
    Abstract:
    This dissertation investigated potential ecological limitations to seedling regeneration in young, seasonally dry, evergreen forest restoration plantations in northern Thailand. We explored whether recruitment of colonizing tree species in the restoration plantations can be attributed to seed dispersal mode (i.e. abiotic or animal dispersal) and seed size. We did this...
    Resource Type:
    Dissertation
    Full Text:
    . Hibbs Bradford A. Withrow-Robinson This dissertation investigated potential ecological

  • Design considerations for strain gage transducers

    Creator:
    Smith, Harlan Bradford
    Abstract:
    Design considerations are presented which apply to all types of electrical resistance strain gage transducers. While the concepts apply to mass produced transducers, the information should be most useful for the engineer or technician who designs one-of-a-kind or "home-made" transducers. Errors which affect the accuracy of strain gage transducers are...
    Resource Type:
    Masters Thesis
    Full Text:
    ABSTRACT OF THE THESIS OF HARLAN BRADFORD SMITH for the MASTER OF SCIENCE (Name) (Degree) in MECHANICAL

  • Holocene accumulation rates of pelagic sediment components in the Panama Basin, Eastern Equatorial Pacific

    Creator:
    Swift, Stephen Atherton
    Abstract:
    Holocene bulk sediment and component accumulation rates were measured in twenty-eight piston and gravity cores taken from the floor of the western Panama Basin and on the surrounding ridges. Radiocarbon ages and oxygen isotope curves provided Holocene age control in nine cores. Time datums in nineteen other cores were inferred...
    Resource Type:
    Masters Thesis
    Full Text:
    and Bradford Arnold for their comments and for serving on my committee. I am very grateful to Dr. I

  • Adiabatic and stable adiabatic times

    Creator:
    Bradford, Kyle B.
    Abstract:
    While the stability of time-homogeneous Markov chains have been extensively studied through the concept of mixing times, the stability of time-inhomogeneous Markov chains has not been studied as in depth. In this manuscript we will introduce special types of time-inhomogeneous Markov chains that are defined through an adiabatic transition. After...
    Resource Type:
    Dissertation
    Full Text:
    AN ABSTRACT OF THE DISSERTATION OF Kyle B. Bradford for the