Index Catalog // ScholarsArchive@OSU

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:: AN ABSTRACT OF THE THESIS OF John B. Cliff for the degree of

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:: I am grateful to my advisor Dr. Peter Bottomley, and to Dr. John Selker for their support and

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

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

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

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

Evaluation of physical and thermal methods to support nonlinear cost optimization models of surimi seafood

Creator:: Hsü, Cheng-kuang
Abstract:: Optimization programming techniques were applied to develop the least cost formulations for Pacific whiting surimi-based seafood (PWSBS). To develop the quality constraint functions, texture and color of whiting surimi gels were determined by torsion test and colorimeter, respectively. Whiting surimi gels were produced by heating at 90°C for 15 min....
Resource Type:: Dissertation
Full Text:: Penner, Dr. Marshall English, Dr. Andrew Hashimoto, and Dr. Daniel Arp for their time and

Emergence and growth of nine accessions of diclofop-resistant Italian ryegrass (Lolium multiflorum L.) and multiple resistance to other herbicides

Creator:: Kunjo, Ebrima Madi
Resource Type:: Masters Thesis
Full Text:: Crabree, and Dr. Daniel J. Arp. To Dr. Muller-Warrant, a special thanks for providing me with the plastic

Transformation of halogenated methanes by microbially-reduced vitamin B₁₂

Creator:: Workman, Darla J.
Resource Type:: Dissertation

Characteristics of bradyrhizobium sp. recovered from Oregon soils

Creator:: Cheng, Hsin-hua
Abstract:: Although the biology of Bradyrhizobium has been studied for almost one hundred years, virtually nothing is known about the ecology and genetic variation in natural soil populations of this genus. The majority of information has been obtained from studies of one species, Bradyrhizobium japonicum, and the diversity within soil populations...
Resource Type:: Masters Thesis
Full Text:: committee members, Dr. Daniel J. Arp, Dr. Stephen J. Giovannoni and Dr. Lynda M. Ciuffetti for their

ScholarsArchive@OSU

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

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

Community composition and activities of denitrifying bacteria in soils

Nitrogen partitioning and remobilization in field-grown apple trees

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

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

Evaluation of physical and thermal methods to support nonlinear cost optimization models of surimi seafood

Emergence and growth of nine accessions of diclofop-resistant Italian ryegrass (Lolium multiflorum L.) and multiple resistance to other herbicides

Transformation of halogenated methanes by microbially-reduced vitamin B₁₂

Characteristics of bradyrhizobium sp. recovered from Oregon soils

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