Index Catalog // ScholarsArchive@OSU

Development of traceable metal oxide nanoparticles for examining environmental fate and transport

Creator:: Rowbotham, Brian
Abstract:: The fate and transport of engineered nanoparticles (ENPs) such as titanium dioxide (TiO₂) are of concern due to their increasing use in consumer products. Although analytical methods for detection and quantification of ENPs in environmental matrices are being developed, these methods are difficult, time consuming, and not easily validated for...
Resource Type:: Masters Thesis
Full Text:: treatment, an d the ability of labeled particles to be detected against background titanium concentrations

The effects of engineered coatings and natural organic matter on nanoparticle aggregation

Creator:: McDowell, Shannon A.
Abstract:: In order to better predict the aggregation state of nanomaterials, the factors that influence aggregation must be understood. The combined effects of natural and engineered coatings have been shown to factor into nanoparticle aggregation behavior in preliminary research. In this study, aggregation behaviors of gold nanoparticles with two different engineered...
Resource Type:: Masters Thesis
Full Text:: . Aggregation of cit-AuNPs in the presence of NOM isolates and KCl. (a-d) TR-DLS profiles of cit-AuNPs in 1

Development and applications of a high-throughput activity assay, using the ammonia-oxidizing bacteria Nitrosomonas europaea

Creator:: Bartow, Shannon M.
Abstract:: The rising demand on freshwater resources emphasizes the benefit of biogeochemical processes that maintain clean water by removing pollutants such as excess nitrogen. The most sensitive step in the removal of nitrogen from waterways is the oxidation of ammonia, a part of nitrification, which is carried out by ammonia oxidizing...
Resource Type:: Masters Thesis
Full Text:: nitrogen under section 303(d) of the Clean Water Act (EPA 1993). Jurisdictions with waters that exceed

Heteroaggregation between citrate-stabilized gold nanoparticles and hematite colloids : mechanisms and quantification of nanoparticle-colloid interactions

Creator:: Smith, Brian M.
Abstract:: Understanding the aggregation behavior of engineered nanomaterials (ENMs) in aqueous environments is essential to understanding their fate, transport, and toxicity. Because naturally occurring colloids will likely be present at much higher concentrations than ENMs in environmental systems, heteroaggregation and attachment with these natural colloids could significantly influence ENM fate and...
Resource Type:: Masters Thesis
Full Text:: of laboratory resources by Dr. Stacey Harper and Dr. Christine Kelly. Conversations with Ed

Interactions between natural organic matter and gold nanoparticles stabilized with different organic capping agents

Creator:: Stankus, Dylan Paul
Abstract:: The adsorption of natural organic matter (NOM) to the surfaces of natural colloids and engineered nanoparticles is known to strongly influence, and in some cases control, their surface properties and aggregation behavior. As a result, the understanding of nanoparticle fate, transport and toxicity in natural systems must include a fundamental...
Resource Type:: Masters Thesis
Full Text:: diffuse layer (d) is comprised of free ions which move in the fluid under the influence of electric

Characterizing Microplastic Ingestion in Black Rockfish (Sebastes melanops) along the Oregon Coast

Creator:: Lasdin, Katherine S.
Abstract:: Microplastics (<5mm diameter) are present in a considerable number of marine and aquatic species. Understanding which species, the global spatial distribution, and what quantities of microplastics are present is extremely important for understanding the potential impacts they could have on recreationally important organisms and for the assessment of risk. We...
Resource Type:: Masters Thesis
Full Text:: to thank my co- advisor, Scott Heppell, and my committee members, Dr. Stacey Harper, Dr. Vrushali

Estimating volume and value on standing timber in hybrid poplar plantations using terrestrial laser scanning : a case study

Creator:: Barnett, Jennifer S.
Abstract:: Terrestrial laser scanning (TLS) may provide a way to increase timber value recovery by replacing manual timber cruising with a simple-to-use, cost-effective alternative. TLS has been studied in several trials worldwide. Past studies have not compared TLS based estimates with mill estimates of stem value and volume. Three differently stocked...
Resource Type:: Masters Thesis
Full Text:: S D D D ln X X , ln X X , ln X X , ln X X , H H Hd ln = f D H HD 1 ln X X , ln X , ln X , ln X

A Multi-Tiered Approach Using Daphnia magna to Assess Chlorpyrifos Risk to Aquatic Receptors

Creator:: Maggio, Stephanie A.
Abstract:: Chlorpyrifos (CPF) is a widely used broad-spectrum organophosphate insecticide. Following exposures, CPF and its more toxic oxon metabolite (CPFO) elicit neurotoxic effects by inhibiting the activity of the acetylcholinesterase enzyme (AChE), resulting in altered fitness and death at high doses. Following exposure, organisms bioactivate CPF to CPFO through the Cytochrome...
Resource Type:: Dissertation
Full Text:: times more acutely toxic to D. magna. Acute assay results were also used to derive the lower

The Influence of Engineered Surface Coatings on Nanoparticle Aggregation and Corona Formation: Examinations in Simulated and Real Aquatic Media

Creator:: Surette, Mark C.
Abstract:: Engineered nanomaterials (ENMs) are small anthropogenic colloids with at least one length dimension <100 nanometers. Due to the nature of their use, ENMs are being increasingly released to the environment. Yet the environmental risks posed by ENMs are unknown due to a variety challenges, including limitations with detecting and quantifying...
Resource Type:: Dissertation
Full Text:: – SECOND MANUSCRIPT.........149 C. SUPPLEMENTARY INFORMATION – THIRD MANUSCRIPT.............172 D

Analytical method development for the identification, detection, and quantification of emerging environmental contaminants in complex matrices

Creator:: Place, Benjamin J.
Abstract:: The development of analytical methods for emerging contaminants creates many unique challenges for analytical chemists. By their nature, emerging contaminants have inherent data gaps related to their environmental occurrence, fate, and impact. This dissertation is a compilation of three studies related to method development for the structural identification of emerging...
Resource Type:: Dissertation
Full Text:: . In addition, I would like to recognize my graduate committee: Dr. Stacey Harper, Dr. Claudia

ScholarsArchive@OSU

Development of traceable metal oxide nanoparticles for examining environmental fate and transport

The effects of engineered coatings and natural organic matter on nanoparticle aggregation

Development and applications of a high-throughput activity assay, using the ammonia-oxidizing bacteria Nitrosomonas europaea

Heteroaggregation between citrate-stabilized gold nanoparticles and hematite colloids : mechanisms and quantification of nanoparticle-colloid interactions

Interactions between natural organic matter and gold nanoparticles stabilized with different organic capping agents

Characterizing Microplastic Ingestion in Black Rockfish (Sebastes melanops) along the Oregon Coast

Estimating volume and value on standing timber in hybrid poplar plantations using terrestrial laser scanning : a case study

A Multi-Tiered Approach Using Daphnia magna to Assess Chlorpyrifos Risk to Aquatic Receptors

The Influence of Engineered Surface Coatings on Nanoparticle Aggregation and Corona Formation: Examinations in Simulated and Real Aquatic Media

Analytical method development for the identification, detection, and quantification of emerging environmental contaminants in complex matrices

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