Results 181 to 190 of about 24,017 (211)
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A novel tool for stable nitrogen isotope analysis in aqueous samples
Rapid Communications in Mass Spectrometry, 2016Rationale Bulk stable isotope analysis (BSIA) of dissolved matter (e.g. dissolved organic carbon, total nitrogen bound (TN b ), etc.) is of particular importance since this pool is a prime conduit in the cycling of N and C.
E. Federherr +9 more
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Stable carbon and nitrogen isotope analysis of avian uric acid
Rapid Communications in Mass Spectrometry, 2008Abstract We report results obtained using a new technique developed to measure the stable‐isotope composition of uric acid isolated from bird excreta (guano). Results from a diet‐switch feeding trial using zebra finches suggest that the δ 13 C of uric ...
Bird, Michael I. +3 more
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Tracing the Influence of Sewage Nitrogen in a Coastal Ecosystem Using Stable Nitrogen Isotopes
AMBIO: A Journal of the Human Environment, 2005This paper reviews the use of stable nitrogen isotopes (delta15N) to delineate the influence of sewage nitrogen (N) in coastal ecosystems, drawing extensively on the case of Himmerfjärden, a Baltic Sea bay that receives 15N-enriched tertiary treated sewage that is discharged mainly as dissolved inorganic N (DIN).
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Labelling Compounds with the Stable Isotopes of Nitrogen and Oxygen
2011In this chapter we consider the methods that have been used to introduce the stable isotopes of nitrogen and oxygen into organic compounds. These isotopes have played an important role both in the study of organic reaction mechanisms and in biosynthesis.
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Model of Nitrogen Source Allocations and Transformations Using Stable Nitrogen Isotopes
World Environmental and Water Resources Congress 2013, 2013Stream restoration for water quality and nutrient management relies on effective assessment methods that measure the before-and-after improvement of water quality, or lack thereof, from implementation. We present a water quality and nutrient modeling tool for potential use in such applications.
W. I. Ford, J. F. Fox
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Fractionation of nitrogen stable isotopes by ion exchange chromatography
Journal of Radioanalytical and Nuclear Chemistry, 2003The ion exchange chromatography displacement technique was used for the enrichment of 15N. The runs were conducted in laboratory and bench scales using two systems of columns filled with Wofatit KPS ion exchange resin (medium porosity type). Ammonia NH4+/NH3 aq. was chosen as the isotopic exchange system.
Aguilera Y +4 more
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INCORPORATING NITROGEN STABLE ISOTOPES INTO ATMOSPHERIC CHEMISTRY MODELS
2021The nitrogen stable isotope composition (δ15N) of nitrogen oxides (NOx) may be an effective tool to evaluate the accuracy of the NOx emission inventories, which are based on different assumptions. In order to approach this goal, the understanding of (1) the δ15N(NOx) values of the major emission sources, (2) how atmospheric processes, such as mixing ...
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Stable isotopes of dissolved nitrogen in oceanic waters
2016Aquatic Sciences Meeting, Aquatic Sciences: Global And Regional Perspectives - North Meets South, 22-27 February 2015, Granada ...
Delgado Huertas, Antonio +8 more
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Metabolic Labeling of Microorganisms with Stable Heavy Nitrogen Isotopes (15N)
2018Quantitative Proteomics based on stable isotope labeling by 15N is a versatile method in determination of changes in microbial protein expression profiles. Once set up, the workflow relies on defined chemical or commercially available complex media leading to universal heavy labeling by the stable isotope 15N.
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