Nitrogen-15 is a rare stable isotope of nitrogen. Two sources of nitrogen-15 are the positron emission of oxygen-15 and the ... Natural nitrogen (7N) consists of two stable isotopes: the vast majority (99.6%) of naturally occurring nitrogen is nitrogen-14 ... Articles with short description, Short description matches Wikidata, Isotopes of nitrogen, Nitrogen, Lists of isotopes by ... isotopes of the chemical element nitrogen, which makes about 99.636% of natural nitrogen. Nitrogen-14 is one of the very few ...
Isotopic labeling Isotopes of hydrogen Isotopes of carbon; δ13C Isotopes of oxygen; δ18O Isotopes of nitrogen; δ15N Isotopes of ... Isotope Isotopologue Isotopomer Isotope analysis Isotopic signature Stable Isotope Ratio Isotope geochemistry Isotope-ratio ... Oxygen isotope ratios can be reported relative to either the VSMOW or VPDB scales. The isotopic scales for sulfur and nitrogen ... For example, nitrogen isotope reference materials include N-bearing molecules such ammonia (NH3), atmospheric dinitrogen (N2), ...
Articles with short description, Short description matches Wikidata, Isotope content page, Isotopes of nitrogen, Positron ... Nitrogen-13 (13N) is a radioisotope of nitrogen used in positron emission tomography (PET). It has a half-life of a little ... Nitrogen-13 is used to tag ammonia molecules for PET myocardial perfusion imaging. Nitrogen-13 is used in medical PET imaging ... Nitrogen-13 plays a significant role in the CNO cycle, which is the dominant source of energy in main-sequence stars more ...
The enrichment of heavy isotopes of nitrogen is possibly caused by mass-selective escape processes. Argon is the third most ... Mars atmospheric nitrogen isotopes. 40 (23): 6033-6037. Bibcode:2013GeoRL..40.6033W. doi:10.1002/2013GL057840. PMC 4459194. ... Mandt, Kathleen; Mousis, Olivier; Chassefière, Eric (July 2015). "Comparative planetology of the history of nitrogen isotopes ... Mandt, Kathleen; Mousis, Olivier; Chassefière, Eric (1 July 2015). "Comparative planetology of the history of nitrogen isotopes ...
Sim, Min Sub; Ono, Shuhei; Bosak, Tanja (2012-12-01). "Effects of Iron and Nitrogen Limitation on Sulfur Isotope Fractionation ... Δ34S Isotopes of sulfur Hydrogen isotope biogeochemistry Stable isotope ratio Isotope analysis Isotope geochemistry Canfield, D ... Isotope effects are divided into two main groups: kinetic isotope effects and equilibrium isotope effects. A kinetic isotope ... Normal kinetic isotope effects cause the lighter isotope (or isotopes) to be preferentially included in a reaction's product. ...
Hydrogen and nitrogen isotope ratios have been used for the authentication of alkylpyrazines used as "natural" coffee ... isotope ratios of the bulk chemical mixture, or isotope ratios of individual constituent compounds. Stable isotopes of carbon ... 2008). "Hydrogen isotope fractionation in freshwater and marine algae: II. Temperature and nitrogen limited growth rate effects ... In an early study on the stable isotope compositions of tropicamide, hydrocortisone, quinine and tryptophan, carbon, nitrogen, ...
Nitrogen has two stable isotopes, 14N and 15N. The ratio between these is measured relative to nitrogen in ambient air. ... Nitrogen ratios are frequently linked to agricultural activities. Nitrogen isotope data has also been used to measure the ... USGS Tritium/Helium-3 Dating Hydrologic Isotope Tracers - Helium Cosmogenic isotopes Environmental isotopes Geochemistry ... Carbon has two stable isotopes, 12C and 13C, and one radioactive isotope, 14C. The stable carbon isotope ratio, δ13C, is ...
Carbon, nitrogen and zinc isotope ratios are used to investigate the diets of past people; these isotopic systems can be used ... Nitrogen isotopes can be used to infer soil conditions, with enriched δ15N used to infer the addition of manure. A complication ... Nitrogen isotopes indicate the trophic level position of organisms (reflective of the time the tissue samples were taken). ... Steele, K. W; Daniel, R. M (2009). "Fractionation of nitrogen isotopes by animals: A further complication to the use of ...
A refinement of the positional parameter in α-nitrogen. Acta Crystallogr., 14, 1000 (1961). F.L. Tucker, J.F. Walper, M.D. ... Crystal Structure of Helium Isotopes. Phys. Rev., 114, 1009 (1959). J. Donohue. ...
Reimchen TE (2001). "Salmon nutrients, nitrogen isotopes and coastal forests" (PDF). Ecoforestry. 16: 13. Quinn, T.; Carlson, S ... Nitrogen Cederholm CJ, Kunze MD, Murota T, Sibatani T (1999). "Pacific salmon carcasses: essential contributions of nutrients ... The bodies of salmon represent a transfer of nutrients from the ocean, rich in nitrogen, sulfur, carbon and phosphorus, to the ... of the total nitrogen available to the riparian woodlands. The foliage of spruce trees up to 500 m (1,600 ft) from a stream ...
Reimchen, TE (2001). "Salmon nutrients, nitrogen isotopes and coastal forests" (PDF). Ecoforestry. 16: 13. Archived (PDF) from ... The migration of salmon represent a massive retrograde nutrient transfer, rich in nitrogen, sulfur, carbon and phosphorus, from ... of the total nitrogen available to the riparian woodlands. The foliage of spruce trees up to 500 m (1,600 ft) from a stream ... where grizzlies fish salmon have been found to contain nitrogen originating from the fished salmon. Beavers also function as ...
Horn, Matthew G.; Beucher, Charlotte P.; Robinson, Rebecca S.; Brzezinski, Mark A. (2011-10-15). "Southern ocean nitrogen and ... Isotopes of silicon Isotope geochemistry Stable isotope ratio Isotope-ratio mass spectrometry Sutton, Jill N.; André, Luc; ... Silicon isotope biogeochemistry is the study of environmental processes using the relative abundance of Si isotopes. As the ... Currently, there are four main analytical methods for the measurement of Si isotopes: Gas Source Isotope-Ratio Mass ...
The normal abundance of nitrogen isotopes in amino acids". J. Biol. Chem. 127 (1): 285-290. (Articles with short description, ... Nevertheless, the presence of the isotope made it possible to trace their metabolic fate. Thus, if a 2H-containing compound, B ... A surprising number of sources, including earlier versions of this article, emphasized radioactive isotopes, even though the ... and he built his career principally on work with isotopes. His introduction of the use of 2H as a tracer to follow the fate of ...
The most widely studied and used isotopes in archaeology are carbon, oxygen, nitrogen, strontium and calcium. An isotope is an ... Oxygen and nitrogen occur in the form of different isotopes which vary in their proportions geospatially and climatically. ... Deniro, Michael J; Epstein, Samuel (1981-03-01). "Influence of diet on the distribution of nitrogen isotopes in animals". ... Unstable isotopes decay at a predictable rate over time. The first stable isotope was discovered in 1913, and most were ...
... isotope analysis) plays an important role in isotope geochemistry, but stable isotopes (mostly hydrogen, carbon, nitrogen, ... The relative abundance of such stable isotopes can be measured experimentally (isotope analysis), yielding an isotope ratio ... the expression stable-isotope ratio is preferably used to refer to isotopes whose relative abundances are affected by isotope ... In ecology, carbon and nitrogen isotope ratios are widely used to determine the broad diets of many free-ranging animals. They ...
Spedding, F. H.; Powell, J. E.; Svec, H. J. (December 1955). "A Laboratory Method for Separating Nitrogen Isotopes by Ion ... He later used ion exchange to separate isotopes of individual elements, including hundreds of grams of almost pure nitrogen-15 ... and later used ion exchange to separate isotopes of individual elements, including hundreds of grams of almost pure nitrogen-15 ... who had considerable experience with isotopes and radioactive elements. McCoy recommended Spedding as an expert on the rare ...
Table of thermal and physical properties of nitrogen (N2) at atmospheric pressure: Nitrogen has two stable isotopes: 14N and ... Liquid nitrogen readily evaporates to form gaseous nitrogen, and hence the precautions associated with gaseous nitrogen also ... ISBN 978-0-08-037941-8. Etymology of Nitrogen Nitrogen at The Periodic Table of Videos (University of Nottingham) Nitrogen ... Atomic nitrogen is prepared by passing an electric discharge through nitrogen gas at 0.1-2 mmHg, which produces atomic nitrogen ...
"Nitrogen isotope fractionation during nitrogen uptake by ectomycorrhizal and non-mycorrhizal Pinus sylvestris". New Phytologist ... doi:10.1046/j.1469-8137.1999.00404.x. Hobbie, E.A.; Agerer, R. (2009). "Nitrogen isotopes in ectomycorrhizal sporocarps ... Long distance types are associated with increased levels of organic nitrogen uptake compared to other exploration types and are ... Wallander, H.; Nylund, J. E. (1992). "Effects of excess nitrogen and phosphorus starvation on the extramatrical mycelium of ...
Her research into the carbon and nitrogen isotopes in particulate material provided a baseline for research into food webs, ... Kendall, Carol (1 January 1998). "Tracing Nitrogen Sources and Cycling in Catchments". Isotope Tracers in Catchment Hydrology: ... doi:10.1111/j.1365-2427.2008.02111.x. Carol Kendall, Megan B. Young (2015), "Isotope data, chemical data, isotope techniques, ... "Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur". Oikos. 102 (2): 378-390. doi:10.1034/j. ...
Graphite was not observed and the nitrogen isotopes are in disequilibrium. The meteoric iron is identifiable by a very high ... Nitrogen Isotopic Disequilibrium in the Cape York III A Iron Schledermann, Peter (May 1981). "Eskimo and Viking Finds in the ...
Example of devices that can be used to measure this ratio are the CHN analyzer and the continuous-flow isotope ratio mass ... A carbon-to-nitrogen ratio (C/N ratio or C:N ratio) is a ratio of the mass of carbon to the mass of nitrogen in organic ... Carbon-to-nitrogen ratios are an indicator for nitrogen limitation of plants and other organisms and can identify whether ... "Carbon to Nitrogen Ratios in Cropping Systems" (PDF). USDA Natural Resources Conservation Service. "Carbon to Nitrogen Ratio (C ...
"Variation in trophic shift for stable isotope ratios of carbon, nitrogen, and sulfur". Oikos. 102 (2): 378-390. doi:10.1034/j. ... isotopes (like the stable carbon-13 isotope or radioactive carbon-14 isotope) have a larger overall mass. Stable isotope ... Isotope geochemistry Fractionation of carbon isotopes in oxygenic photosynthesis Isotopes of carbon Isotopic signature Farquhar ... though currently only a significant isotope effect is seen for carbon isotope substitution. Isotopes are atoms that have the ...
Nitrogen, argon and helium are common carrier gases used in the ECD. Argon and helium need to be combined with another gas, ... Some examples of radioactive isotopes used are 3H, 63Ni, 85Kr, and 90Sr. The gas in the detector chamber is ionized by the ... Pesticide derivatives, nitrogen containing herbicides, and phosphorus-containing insecticides have also been detected in EC-MS ...
Much of Fawcett's works is based on measurements of stable nitrogen isotopes. Fawcett is also addressing the lack of research ... In her doctorate Fawcett investigated the relationship between nitrogen and populations of phytoplankton in upwelling ... but the dynamics of the nitrogen-phytoplankton system limit its efficiency. ...
One example are the nitrogen isotope ratios in macroalgae. California current is a very wide, cold and strong current. It runs ...
Nitrogen, like carbon, shows characteristic isotope shifts, depending on the fixation pathway, that can be used to assess ... However, also like carbon, a variety of factors go into the nitrogen isotope composition of lake sediments, which makes ... Botrel, Morgan; Gregory-Eaves, Irene; Maranger, Roxane (2014-12-01). "Defining drivers of nitrogen stable isotopes (δ15N) of ... A key technique in determining the origin of deposited organic matter is to examine the carbon-to-nitrogen ratio (C:N). Aquatic ...
2012, 2013 measured deuterium level, C/H, and nitrogen isotopes to quantify alteration. This line of inquiry continues, as the ... The isotope levels of their elements do not match solar system levels, instead being closer to e. g., the interstellar medium. ... Multiple isotopes do not match Earth levels, strong evidence for non-contamination. The levels of amino acids are higher in CMs ... Isotope profiling indicates these are meteoritic, not terrestrial. The organics of C-chondrites divide into soluble, and IOM ( ...
The level of rainfall, for example, impacts the relative frequency of nitrogen isotopes. In times of higher rainfall, 15N is ... is a source of nitrogen (N) and available phosphate (P2O5). Seabird guano contains plant nutrients including nitrogen, ... Stable isotope analysis of bat guano was also used to support that the climate of the Grand Canyon was cooler and wetter during ... Bat guano is partially decomposed bat excrement and has an organic matter content greater than 40%, is a source of nitrogen, ...
He used stable nitrogen isotopes to study the mechanisms of the catalytic reactions. In conjunction with Stephen Brunauer and ... At the Fixed Nitrogen Research Laboratory, Emmett's research goals were to study nitrogen fixation and its applications to the ... In 1926, he moved to Washington, D.C. to work at the US Department of Agriculture's Fixed Nitrogen Research Laboratory. For ... They used a fluorocarbon polymeric barrier to separate the two isotopes via diffusion. The lab also sought to synthesize the ...
Nitrogen-15 (15N) tracing is a technique to study the nitrogen cycle using the heavier, stable nitrogen isotope 15N. Despite ... Articles with short description, Short description matches Wikidata, Isotopes of nitrogen, Nitrogen cycle). ... The amendment of additional nitrogen can also be a bias by changing natural nitrogen transformations. In agricultural soil, ... simultaneous nitrogen transformations into account. A numerical tool to study the nitrogen cycle is the Ntrace model based on a ...