Index Catalog // ScholarsArchive@OSU

Abiotic and biological transformation of TBOS and TKEBS, and their role in the biological transformation of TCE and c-DCE

Creator:: Vancheeswaran, Sanjay
Abstract:: At Site-300, Lawrence Livermore National Laboratory (LLNL), CA, trichloroethene (TCE) is present along with tetraalkoxysilanes such as tetrabutoxysilane (TBOS) and tetrakis(2-ethylbutoxy) silane (TKEBS), as subsurface contaminants. Intrinsic transformation of TCE to cis-dichloroethene (c-DCE) was observed in the groundwater at locations co-contaminated with TBOS or TKEBS. Attenuation of TBOS and TKEBS...
Resource Type:: Masters Thesis
Full Text:: Vancheeswaran for the degree of Master of Science in Chemistry and Civil Engineering presented on June 10, 1998

Experimental demonstration and modeling of aerobic cometabolism of 1,4-dioxane by isobutane-utilizing microorganisms in aquifer microcosms

Creator:: Rolston, Hannah M.
Abstract:: 1,4-dioxane, a probable human carcinogen at low (< 1ppb) concentrations, has emerged as a groundwater contaminant due to its historical use as a stabilizer for the chlorinated solvent 1,1,1-trichloroethane. Aerobic cometabolism, the use of a primary substrate to induce the production of microbial enzymes that fortuitously degrade other compounds, is...
Resource Type:: Masters Thesis
Full Text:: of isobutane over approximately 300 days, though transformation rates slowed without inorganic

The Vadose Zone as a Hyporheic Carbon Source : A Look at Temporal Trends in Hyporheic Zone pCO₂

Creator:: Brandes, Jason B.
Abstract:: Stream chemistry studies conducted in the forested Watershed 1 of the HJ Andrews Experimental Forest show a contribution of CO2 from the hyporheic zone. Hyporheic CO₂ concentrations, measured as pCO₂, have a seasonal trend as well as a responsiveness to storm events. Concentrations are highest at the end of the...
Resource Type:: Masters Thesis
Full Text:: Haggerty Lewis Semprini Stream chemistry studies conducted in the forested Watershed 1 of

Influence of Corexit 9500A and Alaska North Slope Crude oil toxicity to the ammonia-oxidizing bacteria, Nitrosomonas europaea, and the ammonia-oxidizing archaea, Nitrosopumilus maritimus

Creator:: Schneider, Margaret C.
Abstract:: The inhibitory effects of Corexit 9500A, Alaska North Slope Crude oil (ANSC), and mixtures of the two on the ammonia-oxidizing bacteria, Nitrosomonas europaea, and the ammonia-oxidizing archaea, Nitrosopumilus maritimus, were investigated. Corexit 9500A was found to be minimally toxic to both microorganisms with concentrations of 2000 and 3000 ppm yielding...
Resource Type:: Honors College Thesis
Full Text:: , demonstrating that the organism fixes inorganic carbon (Könneke et al., 2005), a trait common to all

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:: proteins and DNA. Nitrogen-containing compounds found in water include the inorganic compounds N2, NH3

Inhibition of the ammonia oxidizing bacteria Nitrosomonas europaea by the emerging contaminant triclosan

Creator:: Hughes, Jamie L.
Abstract:: Identifying the inhibition of ammonia oxidizing bacteria (AOB) by emerging organic contaminants is crucial due to the importance of AOB in wastewater treatment, the widespread use of antibacterial agents such as triclosan (TCS) in consumer products, and the sensitivity of N. europaea to inhibitors. Triclosan inhibition of nitrification by AOB...
Resource Type:: Masters Thesis
Full Text:: monitoring with the metered addition of 0.5 M Na2CO3 which also supplied N. europaea with an inorganic

Effects of silver ions and nanoparticles on suspended cells and biofilms of Nitrosomonas europaea

Creator:: Barker, Leila Kelly
Abstract:: Silver nanoparticles are increasingly being incorporated into consumer products due to their broad-spectrum antimicrobial properties. The resulting influx of silver nanoparticles into wastewater may pose a threat to bacteria involved in biological wastewater treatment. Ammonia-oxidizing bacteria, which convert ammonia to nitrite in the first step of nitrification, are highly sensitive...
Resource Type:: Masters Thesis

Radon-222 as an indicator for nonaqueous phase liquids in the saturated zone : developing a detection technology

Creator:: Hopkins, Omar Snowden
Abstract:: Radon-222 gas has unique properties allowing it to be used as an indicator for the presence of organic phase liquids in the saturated zone. It naturally occurs in soils. It is radioactive, making quantitative detection straight forward. A noble gas, it is chemically inert and does not react with aquifer...
Resource Type:: Masters Thesis
Full Text:: inorganic and organic materials, while decreasing their water solubility (Kroschwitz, 1993, V.5, pg. 1019

Protection of Nitrosomonas europaea from Silver Nanoparticle-Induced Inhibition through a Two-Step, Magnesium-Facilitated Mechanism

Creator:: Anderson, Joseph W.
Abstract:: The inhibitory effects of (Ag⁺) and silver nanoparticles (Ag NP) 3-5 nm in diameter (stabilized with polyvinylpyrrolidone (PVP)) and 20 nm (stabilized with citrate) on nitrification rates of the model ammonia-oxidizing bacteria (AOB) Nitrosomonas europaea were investigated. Experimental solutions contained HEPES buffer and ammonia (NH₃) in the presence and absence...
Resource Type:: Honors College Thesis

Inhibition, gene expression and modeling of ammonia oxidation in biofilms of Nitrosomonas europaea

Creator:: Lauchnor, Ellen Grace
Abstract:: This dissertation explores the physiology and gene expression of the ammonia-oxidizing bacterium Nitrosomonas europaea in surface-associated bacterial communities, or biofilms. Biofilms of N. europaea were cultivated in drip flow reactors for several weeks and gene expression microarrays were used to detect 240 genes differentially expressed between the mature biofilms and...
Resource Type:: Dissertation
Full Text:: product phenol (79). Because AOB are autotrophic they must use inorganic carbon for synthesis of

ScholarsArchive@OSU

Abiotic and biological transformation of TBOS and TKEBS, and their role in the biological transformation of TCE and c-DCE

Experimental demonstration and modeling of aerobic cometabolism of 1,4-dioxane by isobutane-utilizing microorganisms in aquifer microcosms

The Vadose Zone as a Hyporheic Carbon Source : A Look at Temporal Trends in Hyporheic Zone pCO₂

Influence of Corexit 9500A and Alaska North Slope Crude oil toxicity to the ammonia-oxidizing bacteria, Nitrosomonas europaea, and the ammonia-oxidizing archaea, Nitrosopumilus maritimus

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

Inhibition of the ammonia oxidizing bacteria Nitrosomonas europaea by the emerging contaminant triclosan

Effects of silver ions and nanoparticles on suspended cells and biofilms of Nitrosomonas europaea

Radon-222 as an indicator for nonaqueous phase liquids in the saturated zone : developing a detection technology

Protection of Nitrosomonas europaea from Silver Nanoparticle-Induced Inhibition through a Two-Step, Magnesium-Facilitated Mechanism

Inhibition, gene expression and modeling of ammonia oxidation in biofilms of Nitrosomonas europaea

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