Index Catalog // ScholarsArchive@OSU

Mineral Surfaces as Agents of Environmental Proteolysis: Mechanisms and Controls

Creator:: Chacon, Stephany S.
Abstract:: The bottleneck in the turnover of soil organic matter (SOM) is the conversion of large molecular compounds into smaller compounds that can be transported through a cell membrane of a microbe for processing. Once inside the cell, organic compounds can be converted into biomass or be respired. The microbial depolymerization...
Resource Type:: Dissertation
Full Text:: AN ABSTRACT OF THE DISSERTATION OF Stephany S. Chacon for

Testing Extractants to Study How Protein Interacts with Iron Oxide Minerals

Creator:: Tan, Aylmer and Chacon, Stephany S.
Abstract:: The goals of this experiment highlighted in this poster were to find a suitable extractant to extract protein adsorbed onto iron oxide minerals and to determine whether those minerals can modify protein. Data obtained from this experiment provides crucial background information to study the effects hydrogen peroxide has on protein...
Resource Type:: Poster
Full Text:: to express my gratitude to Joseph S. Beckman, Ph.D., Alvaro G. Estevez, Ph.D. and Peter Bottomley

Artificial means of distinguishing smooth-line map unit boundaries : an examination of Oregon soil survey maps

Creator:: Sun, Yulin
Abstract:: Soil is a complex living system with high heterogeneity, which makes locating soil map boundaries a challenge. In traditional soil survey, the placement of soil map boundaries relies largely (at least initially) on identifying the soil-forming factors of biota and topographic relief through stereo aerial photo pairs. Future soil survey...
Resource Type:: Masters Thesis
Full Text:: Wanzek, Stephany Chacon, Trang Nguyen, and Pedro Rodrigues de Moraes Martinez, for their help in

Merging Field Work with Machine Learning : Exploring Andic Soil Development in the Cascade Range

Creator:: Osterloh, Kristopher Richard
Abstract:: Andic soils (aka Andisols) have unique properties that are important to society. For soil scientists, the genesis and taxonomy of Andisols is often confused because they can form in both volcanic and non-volcanic material. This dissertation seeks to address such confusion by looking at andic soil development in the Cascade...
Resource Type:: Dissertation
Full Text:: you with all my heart. Stephany Chacon, my long time roommate. Tom Wanzek, my gym bro for life

Scaling, ash-driven bistability, and other agents of soilscape genesis discovered while digitally mapping soils of the Blue Mountains, Oregon

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:: , Stephany Chacon, Sarah Light, Chris Ringo, Burl Carpenter, Edgar Velásquez (mielito), Adam Lindsley

Soil Solarization in Pacific Northwest Tree Seedling Nurseries: Effects on Soilborne Plant Pathogens, Soil Nutrients and the Soil Microbiome

Creator:: Weidman, Clara S.
Abstract:: Nursery and greenhouse products are economically important agricultural commodities for Oregon and Washington. Nursery crops including tree seedlings can be damaged or killed by soilborne plant pathogens, which can be challenging to manage because of their persistence in soil and limited options for control. Soil solarization is a pre-planting soil...
Resource Type:: Masters Thesis
Full Text:: supportive and helpful throughout this process, especially Danielle Runion, Stephany Chacon, Vance Almquist

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

Ancient Greek agricultural soils of the Venella River Valley, Metaponto, Italy : An exploratory analysis

Creator:: Carpenter, Burl L.
Abstract:: Approximately 2700 years ago, Greek settlers from the Northwestern Peloponnese region of Achaea emigrated to the central coast of Southern Italy along the Gulf of Taranto. The city they founded, Metapontum, served as an important center for Magna Graecia, the lands on the Southern Italic peninsula wholly populated by Hellenic...
Resource Type:: Masters Thesis
Full Text:: goose chase that has resulted in my degree. Adam Lindsley, Aimee Clark, Tom Wanzek, Stephany Chacon

Mechanisms of Organic Matter Accumulation and Feedbacks on Pore Space in Ferralsols/Oxisols Containing High Carbon Stocks

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

Measuring Electron Activity to Constrain the Role of Soil Structure in the Formation of Biogeochemical Heterogeneity

Creator:: Wanzek, Thomas
Abstract:: Soils have a critical role in global carbon (C) cycling, containing one of the largest fast-cycling carbon stocks on earth. Robust representation of soil organic matter dynamics in Earth System Models is critical for future climate prediction. Current C cycling models assume that all C cycling in non-hydric (i.e. ‘upland’)...
Resource Type:: Masters Thesis
Full Text:: ., 1990) pedogenic thresholds of Fe, P and S (Chacon et al., 2006; Dorau and Mansfeldt, 2016; Gomez et

ScholarsArchive@OSU

Mineral Surfaces as Agents of Environmental Proteolysis: Mechanisms and Controls

Testing Extractants to Study How Protein Interacts with Iron Oxide Minerals

Artificial means of distinguishing smooth-line map unit boundaries : an examination of Oregon soil survey maps

Merging Field Work with Machine Learning : Exploring Andic Soil Development in the Cascade Range

Scaling, ash-driven bistability, and other agents of soilscape genesis discovered while digitally mapping soils of the Blue Mountains, Oregon

Soil Solarization in Pacific Northwest Tree Seedling Nurseries: Effects on Soilborne Plant Pathogens, Soil Nutrients and the Soil Microbiome

Diversity and Activity of Microbial Extracellular Peptidases in Soil

Ancient Greek agricultural soils of the Venella River Valley, Metaponto, Italy : An exploratory analysis

Mechanisms of Organic Matter Accumulation and Feedbacks on Pore Space in Ferralsols/Oxisols Containing High Carbon Stocks

Measuring Electron Activity to Constrain the Role of Soil Structure in the Formation of Biogeochemical Heterogeneity

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