Gas chromatography/ combustion/isotope ratio mass spectrometric comparison of N-acetyl- and N-pivaloyl amino acid esters to measure 15N isotopic abundances
in physiological samples: a pilot study on amino acid synthesis in the upper gastrointestinal tract of minipigs.
Every two years, the International Union of Pure and Applied Chemistry (IUPAC) Commission on Isotopic Abundances
and Atomic Weights meets to discuss how best to communicate the latest data on various elements.
Probing isotopic abundances can also tell scientists about ancient climates, the early solar system and much more.
While the variation in isotopic abundances is incredibly useful, it made a mess of the official table of standard atomic weights.
ToF-SIMS provides rapid identification of both organic and inorganic constituents and their characteristic isotopic abundances
with excellent sensitivity.
Trace element, rare-earth-element (REE) and isotopic abundances
reflect a variety of factors including the source of the magma, the percentage of the source rock that undergoes melting, the extent of crystal fractionation, and the contamination of either magma from adjacent rocks or from other magmas of other arc systems.
The ability to detect differences depends on a number of factors, including the purity of the separated tracer, the total amount of the element under investigation, and the sensitivity of the instruments for measuring the isotopic abundances
Reporting of stable hydrogen, carbon, and oxygen isotopic abundances
The relative isotopic abundances
of the Cd isotopes added in the spike and indigenous Cd are given in Table 1.
in % for Various Elemental Compositions CHON (M = 100%)
Biological control of calcium isotopic abundances
in the global calcium cycle.
Applying the appropriate correction factor for isotopic abundance
would yield an accurate testosterone concentration for the sample (103.