Search Results - "Tobias, Craig R."

Constraining the Oxygen Isotopic Composition of Nitrate Produced by Nitrification by Boshers, Danielle S, Granger, Julie, Tobias, Craig R, Böhlke, John K, Smith, Richard L

“…Measurements of the stable isotope ratios of nitrogen (15N/14N) and oxygen (18O/16O) in nitrate (NO3 –) enable identification of sources, dispersal, and fate…”
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The Importance of Dissimilatory Nitrate Reduction to Ammonium (DNRA) in the Nitrogen Cycle of Coastal Ecosystems by GIBLIN, ANNE E., TOBIAS, CRAIG R., SONG, BONGKEUN, WESTON, NATHANIEL, BANTA, GARY T., H.RIVERA-MONROY, VICTOR

“…Until recently, it was believed that biological assimilation and gaseous nitrogen (N) loss through denitrification were the two major fates of nitrate entering…”
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Role of Anaerobic Ammonium Oxidation (Anammox) in Nitrogen Removal from a Freshwater Aquifer by Smith, Richard L, Böhlke, J. K, Song, Bongkeun, Tobias, Craig R

“…Anaerobic ammonium oxidation (anammox) couples the oxidation of ammonium with the reduction of nitrite, producing N2. The presence and activity of anammox…”
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Biogeographical distribution of diverse anaerobic ammonium oxidizing (anammox) bacteria in Cape Fear River Estuary by Dale, Olivia R, Tobias, Craig R, Song, Bongkeun

“…Anaerobic ammonium oxidation (anammox) specific PCR method was developed to examine diversity and distribution of anammox bacteria in sediments collected from…”
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Genetic and biogeochemical investigation of sedimentary nitrogen cycling communities responding to tidal and seasonal dynamics in Cape Fear River Estuary by Lisa, Jessica A., Song, Bongkeun, Tobias, Craig R., Hines, David E.

“…Tidal and seasonal fluctuations in the oligohaline reaches of estuaries may alter geochemical features that influence structure and function of microbial…”
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Hyporheic zone denitrification: Controls on effective reaction depth and contribution to whole-stream mass balance by Harvey, Judson W., Böhlke, J. K., Voytek, Mary A., Scott, Durelle, Tobias, Craig R.

“…Stream denitrification is thought to be enhanced by hyporheic transport but there is little direct evidence from the field. To investigate at a field site, we…”
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The contamination of commercial 15N2 gas stocks with 15N-labeled nitrate and ammonium and consequences for nitrogen fixation measurements by Dabundo, Richard, Lehmann, Moritz F, Treibergs, Lija, Tobias, Craig R, Altabet, Mark A, Moisander, Pia H, Granger, Julie

“…We report on the contamination of commercial 15-nitrogen (15N) N2 gas stocks with 15N-enriched ammonium, nitrate and/or nitrite, and nitrous oxide. 15N2 gas is…”
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Linking DNRA community structure and activity in a shallow lagoonal estuarine system by Song, Bongkeun, Lisa, Jessica A, Tobias, Craig R

“…Dissimilatory nitrate reduction to ammonium (DNRA) and denitrification are two nitrate respiration pathways in the microbial nitrogen cycle. Diversity and…”
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The influence of sample matrix on the accuracy of nitrite N and O isotope ratio analyses with the azide method by Granger, Julie, Boshers, Danielle S., Böhlke, John K., Yu, Dan, Chen, Nengwang, Tobias, Craig R.

“…Rationale The isotope ratios of nitrogen (15N/14N) and oxygen (18O/16O) in nitrite (NO2−) can be measured by conversion of the nitrite into nitrous oxide (N2O)…”
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Tracking the Fate of a High Concentration Groundwater Nitrate Plume through a Fringing Marsh: A Combined Groundwater Tracer and in situ Isotope Enrichment Study by Tobias, Craig R., Macko, Stephen A., Anderson, Iris C., Canuel, Elizabeth A., Harvey, Judson W.

“…A groundwater plume enriched in15NO3 -was created upgradient of a mesohaline salt marsh. By measuring the changes in concentration and isotopic enrichment…”
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Synthesis of [13C](C1-C6),[15N](N1,N2)-labeled 2,4-dinitroanisole (DNAN) and [13C](C3,C5),[15N](N6)-labeled 5-nitro-2,4-dihydro-3H-1,2,4-triazol-3-one (NTO) by Davis, Matthew C., Fallis, Stephen, Tobias, Craig R.

“…Manufacture and use of explosives in the past have led to environmental contamination by energetic materials. Today, there is an emphasis to better understand…”
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Impact of chloride on denitrification potential in roadside wetlands by Lancaster, Nakita A., Bushey, Joseph T., Tobias, Craig R., Song, Bongkeun, Vadas, Timothy M.

“…Developed landscapes are exposed to changes in hydrology and water chemistry that limit their ability to mitigate detrimental impacts to coastal water bodies,…”
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Nitrification in a Subterranean Estuary: An Ex Situ and In Situ Method Comparison Determines Nitrate Is Available for Discharge by Wilson, Stephanie J., Song, Bongkeun, Anderson, Iris C., Tobias, Craig R.

“…Subterranean estuaries (STEs) form in the subsurface where fresh groundwater and seawater meet and mix. Subterranean estuaries support a variety of…”
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Molecular and stable isotope methods to detect and measure anaerobic ammonium oxidation (anammox) in aquatic ecosystems by Song, Bongkeun, Tobias, Craig R

“…Numerous microbial processes transform nitrogen (N) but three anaerobic respiratory pathways remove fixed N from the environment: denitrification (nitrate…”
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Dynamic modeling of nitrogen losses in river networks unravels the coupled effects of hydrological and biogeochemical processes by Alexander, Richard B, Böhlke, John Karl, Boyer, Elizabeth W, David, Mark B, Harvey, Judson W, Mulholland, Patrick J, Seitzinger, Sybil P, Tobias, Craig R, Tonitto, Christina, Wollheim, Wilfred M

“…The importance of lotic systems as sinks for nitrogen inputs is well recognized. A fraction of nitrogen in streamflow is removed to the atmosphere via…”
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Temporal and Spatial Variations in Subterranean Estuary Geochemical Gradients and Nutrient Cycling Rates: Impacts on Groundwater Nutrient Export to Estuaries by Wilson, Stephanie J., Anderson, Iris C., Song, Bongkeun, Tobias, Craig R.

“…Subterranean estuaries (STEs) form at the land‐sea boundary where groundwater and seawater mix. These biogeochemically reactive zones influence…”
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Groundwater nitrogen processing in Northern Gulf of Mexico restored marshes by Sparks, Eric L., Cebrian, Just, Tobias, Craig R., May, Christopher A.

“…Groundwater nitrogen processing was examined in a restored black needlerush (Juncus roemerianus) marsh to assess its potential for removing land-derived…”
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Seawater intrusion effects on nitrogen cycling in the regulated Nakdong River Estuary, South Korea by Huang, Yan, Song, Bongkeun, Zhang, Qinglong, Park, Yunjung, Wilson, Stephanie J., Tobias, Craig R., An, Soonmo

“…Research on the impact of seawater intrusion on nitrogen (N) cycling in coastal estuarine ecosystems is crucial; however, there is still a lack of relevant…”
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Seasonality of nitrogen sources, cycling, and loading in a New England river discerned from nitrate isotope ratios by Rollinson, Veronica R, Granger, Julie, Clark, Sydney C, Blanusa, Mackenzie L, Koerting, Claudia P, Vaudrey, Jamie M. P, Treibergs, Lija A, Westbrook, Holly C, Matassa, Catherine M, Hastings, Meredith G, Tobias, Craig R

“…Coastal waters globally are increasingly impacted due to the anthropogenic loading of nitrogen (N) from the watershed. To assess dominant sources contributing…”
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Ecosystem-based management for military training, biodiversity, carbon storage and climate resiliency on a complex coastal land/water-scape by Christensen, Norman L., Cunningham, Patricia A., Matthews, Kimberly, Anderson, Iris C., Brush, Mark J., Cohen, Susan, Currin, Carolyn A., Ensign, Scott, Hall, Nathan S., Halpin, Patrick N., Kirwan, Matthew L., McNinch, Jesse R., Paerl, Hans W., Piehler, Michael F., Rodriguez, Antonio B., Tobias, Craig R., Walters, Jeffrey R.

“…The Defense Coastal/Estuarine Research Program (DCERP) was a 10-year multi-investigator project funded by the Department of Defense to improve understanding of…”
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