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Filtering by: Creator Giguere, Andrew Remove constraint Creator: Giguere, Andrew Advisor Myrold, David D. Remove constraint Advisor: Myrold, David D.

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  • An Examination of Factors Controlling the Activity of Ammonia- and Nitrite-oxidizers in Diverse Soils

    Creator:
    Giguere, Andrew T.
    Abstract:
    Nitrification is a critical step in the global nitrogen cycle involving the biological oxidation of ammonia (NH₃) to nitrite (NO₂⁻ ) and then to nitrate (NO₃⁻). The first step in nitrification is carried out by NH₃-oxidizing bacteria (AOB) and archaea (AOA), and the second by NO₂⁻-oxidizing bacteria (NOB). In addition...
    Resource Type:
    Dissertation
    Full Text:
    Andrew T. Giguere for the degree of Doctor of Philosophy in Soil Science presented on March 20, 2017

  • Contributions of ammonia-oxidizing bacteria and archaea to nitrification in forest soils

    Creator:
    Lu, Xinda
    Abstract:
    Prior to 2005, ammonia oxidation, the first step of nitrification, was thought mediated mainly by ammonia-oxidizing bacteria (AOB). However, the discovery of Thaumarchaeota carrying the genes coding for the ammonia monooxygenase (AMO) enzyme led to the discovery that ammonia-oxidizing archaea (AOA) also contribute to nitrification. Despite the uptick in studies...
    Resource Type:
    Masters Thesis
    Full Text:
    people: Anne Taylor, Andrew Giguere, Kristin Kasschau, Fumiaki Funahashi, Rachel Danielson. I also

  • Impact of Dairy Manure Digestate on Microbial Activities in Soil

    Creator:
    Waggoner, Ashley L
    Abstract:
    Amendments and fertilizers applied to optimize crop production and improve soil health also supply inputs of soil organic matter (SOM) and nutrients that affect soil microorganisms. In the dairy-intensive Pacific Northwest, dairy manure is stored as slurry mixtures until conditions are appropriate for soil application. During storage, the manure begins...
    Resource Type:
    Dissertation
    Full Text:
    ; Erguder et al., 2009; Giguere et al., 2015; Gubry- Rangin et al., 2017, 2011; Hatzenpichler, 2012; Taylor

  • Diversity and Activity of Microbial Extracellular Peptidases in Soil

    Creator:
    Nguyen, Trang T. H.
    Abstract:
    Soil nitrogen exists largely as organic matter, including plant liter, dead animal matter, and microbial necromass. About 90% of soil organic nitrogen is proteinaceous material that is too large for plants and microorganisms to assimilate directly. Protein depolymerization therefore plays a critical role in mobilizing this organic source of nitrogen,...
    Resource Type:
    Dissertation
    Full Text:
    Waggoner, Christopher Burgess, Stephany Chacon, Josh Neuman, Rachel Danielson, Nate Tisdell, Andrew