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Filtering by: Creator Breysse, Daniel H. Remove constraint Creator: Breysse, Daniel H. Committee Member Arp, Daniel J. Remove constraint Committee Member: Arp, Daniel J.

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  • Community composition and activities of denitrifying bacteria in soils

    Creator:
    Rich, Jeremy J.
    Abstract:
    Few studies have directly compared denitrifying community composition and activities in soils by coupling molecular-genetic techniques and traditional measures of denitnfication. I investigated communities of denitrifying bacteria from adjacent meadow and forest soils in the Cascade Mountains, Oregon. A key gene in the denitrification pathway, N₂O reductase (nosZ), served as...
    Resource Type:
    Dissertation
    Full Text:
    adjacent meadow and forest soils in the H. J Andrews. Thank you to Peter Bottomley for helpful discussions

  • Interactions between microbial dynamics, water flow, and solute transport in unsaturated porous media

    Creator:
    Yarwood, Rockie R.
    Abstract:
    Bioremediation in the vadose zone is unpredictable because of poor understanding of factors influencing microbial growth in this environment. A lab-scale experimental system was developed to examine, noninvasively, interactions between microbial growth, water flow, and solute transport in unsaturated porous media. Measurements of microbial colonization, and its impact on hydrology,...
    Resource Type:
    Dissertation
    Full Text:
    members, Dr. Daniel Arp and Dr. Jennifer Field, and to Dr. Linda Blythe. Special thanks to Dr. Larry

  • Quantification of fructose equivalents in straw extracts

    Creator:
    Kim, Eugene
    Abstract:
    Cereal and commercial grass-seed straws are abundant plant biomass materials that are currently being considered for application in industrial processes aimed at the production of biofuels, biomaterials, and biochemicals. The carbohydrate fraction of these straws is of particular interest in this context due to its chemical functionality and relative ease...
    Resource Type:
    Masters Thesis
    Full Text:
    : Michael H. Penner Cereal and commercial grass-seed straws are abundant plant biomass materials that

  • Cometabolic degradation of polycyclic aromatic hydrocarbons (PAHs) and aromatic ethers by phenol- and ammonia-oxidizing bacteria

    Creator:
    Chang, Soon Woong
    Abstract:
    Cometabolic biodegradation processes are potentially useful for the bioremediation of hazardous waste sites. In this study the potential application of phenol-oxidizing and nitrifying bacteria as "priming biocatalysts" was examined in the degradation of polycyclic aromatic hydrocarbons (PAHs), aryl ethers, and aromatic ethers. We observed that a phenol-oxidizing Pseudomonas strain cometabolically...
    Resource Type:
    Dissertation
    Full Text:
    committee members, Drs. Daniel Arp, Sandra Woods, and Ben Lee, who advised me through the graduate program

  • Nitrogen partitioning and remobilization in field-grown apple trees

    Creator:
    Khemira, Habib
    Abstract:
    Uptake and cycling of nitrogen (N) in mature trees are not well understood. Fertilizer-N uptake, partitioning, and use-efficiency were studied in standard strain 'Topred Delicious' and spur strain 'Redspur Delicious' mature apple trees {Malus domestica Borck) on 'Malling 7A' (M.7A) rootstocks. The treatments consisted of a ground application in spring,...
    Resource Type:
    Dissertation
    Full Text:
    to thank my committee members Drs. Pat Breen, Daniel Arp, and Gary Jolliff for their patience and

  • Inhibition, gene expression and modeling of ammonia oxidation in biofilms of Nitrosomonas europaea

    Creator:
    Lauchnor, Ellen Grace
    Abstract:
    This dissertation explores the physiology and gene expression of the ammonia-oxidizing bacterium Nitrosomonas europaea in surface-associated bacterial communities, or biofilms. Biofilms of N. europaea were cultivated in drip flow reactors for several weeks and gene expression microarrays were used to detect 240 genes differentially expressed between the mature biofilms and...
    Resource Type:
    Dissertation
    Full Text:
    out by AOB produce hydrogen ions (H + ) as well as NO2 - , as shown in the above chemical equation

  • An evaluation of factors influencing the management of Otiorhynchus sulcatus (F.) (Coleoptera: Curculionidae)

    Creator:
    Kepler, Ryan M.
    Abstract:
    The black vine weevil (BVW), Otiorhynchus sulcatus (F.) (Coleoptera: Curculionidae) is a persistent pest of nursery operations in the United States, feeding on over 140 species of plants. The goals of this research were to 1) assess the behavioral response of BVW to a commonly employed insecticide bifenthrin (Talstar 0.2G®)...
    Resource Type:
    Masters Thesis

  • Improving the nutritional and textural properties of dairy products by feeding Holstein cows processed flaxseed

    Creator:
    Oeffner, Scott P.
    Abstract:
    There is growing public concern about the high proportion of saturated fatty acids in milk fat; however, feed intake, energy partitioning toward milk synthesis, and milk fat concentrations can decrease when cows are fed high concentrations of unsaturated lipids. The objective of this study was to identify the optimal rate...
    Resource Type:
    Masters Thesis
    Full Text:
    ;:$&#-&5=:&3:49@#%9?!7&!-$&?#59"=9-$4#!7&H-oxidation pathways such as Acyl-CoA oxidase, Enoyl-CoA

  • Toward understanding the nature of the soil microsite in relation to nitrogen and carbon cycling

    Creator:
    Cliff, John B.
    Abstract:
    My research has focused on understanding N and C cycling in soils at small scales. Isotope dilution methods commonly used to estimate gross rates of soil chemical transformations assume homogeneous distribution of label. I explored the effects of diffusion limitations on isotope dilution experiments in soil aggregates using spherical diffusion-reaction...
    Resource Type:
    Dissertation
    Full Text:
    support, and for allowing me enough rope to hang myself. I also thank Dr. Daniel J Arp, Dr. Roy Haggerty

  • The relationship of a problem-based calculus course and students' views of mathematical thinking

    Creator:
    Liu, Po-Hung
    Abstract:
    It has been held that heuristic training alone is not enough for developing one's mathematical thinking. One missing component is a mathematical point of view. Many educational researchers have proposed problem-based curricula to improve students' views of mathematical thinking. The present study reports findings regarding effects of a problem-based calculus...
    Resource Type:
    Dissertation
    Full Text:
    . Daniel Arp for their comments. My deep appreciation also goes to two former committee members, Dr