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Filtering by: Creator Mellbye, Brett Remove constraint Creator: Mellbye, Brett Committee Member Kleber, Markus Remove constraint Committee Member: Kleber, Markus

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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:
    to Luis Sayavedra-Soto and Brett Mellbye for their insightful conversations, technical assistance

  • 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:
    . Peter Bottomley, Dr. Anne Taylor, Dr. Brett Mellbye, Dr. Armanda Roco for providing me valuable