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  • nitrogen
  • Our study shows thatdespitelimitations imposed by the biomass requirements for EA-IRMS (elemental analyserisotope ratio massspectrometry)natural isotope abundances of carbon and nitrogen are powerful tools to unravel trophicstructure within nematode communities. (awi.de)
  • At the same time, the prominence of di¡erent trophic levelsresults in a large span of d15N, largely invalidating the use of nitrogen isotope abundances to assess foodsources and trophic level of whole nematode communities. (awi.de)
  • however, it should be noted that the isotopes of hydrogen, nitrogen, oxygen, and sulfur have also been measured using optical spectroscopy techniques ( 5 , 7 ). (pnas.org)
  • A study of the fractionation of nitrogen isotopes in the diet by cattle is described and the results discussed. (cambridge.org)
  • carbon dioxide
  • The technique relies on the chromatographic separation of a mixture into individual organic compounds, the combustion of each organic compound into carbon dioxide, water, and other oxidation products, and the precise measurement of the 13 C/ 12 C isotope ratio in the carbon dioxide gas, using the absorption method of cavity ring-down spectroscopy. (pnas.org)
  • More specifically, each carbon atom in the compound of interest is converted to carbon dioxide, which allows the 13 C/ 12 C isotope ratio to be determined from the simple and well established infrared spectrum of carbon dioxide, using CRDS. (pnas.org)
  • nuclear
  • The isotope 56 Fe is the isotope with the lowest mass per nucleon, 930.412 MeV/c 2 , though not the isotope with the highest nuclear binding energy per nucleon, which is nickel-62 . (archive.org)
  • The isotope 57 Fe is widely used in Mössbauer spectroscopy and the related nuclear resonance vibrational spectroscopy due to the low natural variation in energy of the 14.4 keV nuclear transition. (archive.org)
  • element
  • In another sense, this statement is false in that different isotopes of an element have differing reaction rates leading to each compound possessing a different isotopic fractionation depending on its history of formation and transport. (pnas.org)
  • Isotope names can be specified by the corresponding element name or abbreviation, followed by a mass number A (e.g. (wolfram.com)
  • mass
  • Germanium has 24 isotopes whose half-lives are known, with mass numbers 58 to 85. (lookchem.com)
  • Lithium has 7 isotopes whose half-lives are known, with mass numbers 5 to 11. (lookchem.com)
  • For this, we combined traditional measurements with nanoscale secondary ion mass spectrometry (NanoSIMS) and stable isotope labeling to investigate patterns of nutrient uptake and translocation both at the organismal scale and at the cellular scale. (frontiersin.org)
  • half-life
  • Iron-60 is an iron isotope with a half-life of 2.6 million years, [ 4 ] [ 5 ] but was thought until 2009 to have a half-life of 1.5 million years. (archive.org)