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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

Creator:: Taylor, Anne E., Vajrala, Neeraja, Giguere, Andrew T., Gitelman, Alix I., Arp, Daniel J., Myrold, David D., Sayavedra-Soto, Luis, and Bottomley, Peter J.
Abstract:: Ammonia (NH₃)-oxidizing bacteria (AOB) and thaumarchaea (AOA) co-occupy most soils, yet no short-term growth-independent method exists to determine their relative contributions to nitrification in situ. Microbial monooxygenases differ in their vulnerability to inactivation by aliphatic n-alkynes, and we found that NH₃ oxidation by the marine thaumarchaeon Nitrosopumilus maritimus was unaffected...
Resource Type:: Article
Full Text:: . Taylora#, Neeraja Vajralab, Andrew T. Giguerea, Alix I. Gitelmanc, Daniel J. Arpb, David D. Myrolda

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

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

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

Creator:: Almquist, Vance Warner
Abstract:: This dissertation reports on four related, though separate projects. The first project details the process of carrying out a digitally augmented soil mapping (DSM) effort alongside an ongoing survey in Oregon's Ochoco National Forest (ONF) using a Random Forest algorithm. The second chapter describes a initial soil survey in Oregon's...
Resource Type:: Dissertation
Full Text:: , Antra Bǒca, Astrid Jacobson, Janis Boettinger, Andrew Giguere, Ryan Hill, Clint Mattox, Pedro Martinez

Creator:: Martinez, Pedro
Abstract:: Deeply weathered soils in tropical rainforests and savannas are classified as Ferralsols according to the World References Bases for Soil Resources (WRB). Ferralsols are most nearly akin to the Oxisols order defined in the US Soil Taxonomy. The acidity, low cation exchange capacity, and strong phosphorus retention by the oxidic...
Resource Type:: Dissertation
Full Text:: , Stephany Chacon, Andrew Giguere, Clara Weidman, Kris Osterloh, Trang Nguyen, Burl Carpenter, Fumiaki

Creator:: Danielson, Rachel E.
Abstract:: Forest harvest persists as one of the most globally important industries, and crucially provides raw wood products for both building and fuel materials. Mechanistically complex abiotic and biotic processes curb ecosystem recovery following timber harvest and it is of great importance to understand the effects of this practice on biogeochemical...
Resource Type:: Masters Thesis
Full Text:: -shooting that came with it. Fellow grad students Fumiaki Funahashi, Trang Nguyen, Nate Tisdell, Andrew

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