isotope exchange

isotope exchange

[′ī·sə‚tōp iks¦chānj]
(nucleonics)
Exchange of places by two atoms, but different isotopes, of the same element in two different molecules, or in different locations of the same molecule.
The transfer of isotopically tagged atoms from one chemical form or valence state to another, without net chemical reaction.
References in periodicals archive ?
The [sup.18]F-labeling can be realized by the simple [sup.18]F-[sup.19]F isotope exchange reaction on an ammoniomethyl-trifluoroborate (AmBF3) group without further drying of fluoride-18 ion and HPLC purification.
Rickard, "Fe isotope exchange between Fe(II)aq and nanoparticulate mackinawite (FeSm) during nanoparticle growth," Earth and Planetary Science Letters, vol.
Clifton Nonstomatal Uptake Controls Inter-annual Lamont Doherty Earth Variability in Ozone Dry Deposition at a Observatory Northern Mid-latitude Broadleaf Deciduous Forest Poster Presenter Winner Kyle Stropes In-situ Measurements of Isotope Exchange Kansas State University using Tunable Diode Laser Spectroscopy in a Tail-Grass Prairie Ecosystem Oral Honorable Mentions Zhongjie Yu A Novel Dynamic Flux Chamber System for University of Pittsburgh Collection of Soil-Emitted Nitric Oxide (NO) for Natural Abundance Stable N Isotope Analysis Manuel Helbig Impact of Permafrost Thaw on Methane Universite de Montreal Fluxes across a Heterogeneous Boreal Landscape Poster Honorable Mentions Benjamin A.
Specifically, collected tritiated water is contacted with a catalyst that makes hydrogen isotope exchange between protium gas (normal hydrogen gas) and tritiated moisture possible, before being reduced in volume and enriched.
"When ozone reacts with carbon dioxide in the atmosphere, it transfers its isotopic weirdness to the new molecule," said Shaheen, who investigated this process of oxygen isotope exchange as a graduate student at the University of Heidelberg in Germany.
During a few decades after the discovery (1,2) of hydrogenase in 1931, the enzymatic activity had been demonstrated with artificial electron carriers such as methylviologen, benzylviologen or methylene blue, or by isotope exchange reactions, and the natural electron carriers had been out of concern.
R is the measured isotope ratio and [I.sub.light isotope] and [I.sub.heavy isotope] are the measured intensities of the lighter and heavier isotope peaks (counts/s) after the isotope exchange.
(1972) Oxygen isotope exchange between quartz and water.