isotope dilution


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isotope dilution

[′ī·sə‚tōp də‚lü·shən]
(nucleonics)
The introduction of a radioisotope into stable isotopes of an element in order to make volume, mass, and age measurements of the element.
References in periodicals archive ?
Twenty odorants were quantified by stable isotope dilution assays.
4:1, by comparing the mean change in total body VA stores assessed by the retinol isotope dilution test [7] in children who consumed either biofortified maize with a placebo dose, or non-biofortified maize with a VA dose [8].
Two examples from Thailand and Mexico demonstrated the value of assessing body vitamin A stores using the retinol isotope dilution technique.
Therefore, the present study was designed to evaluate the effect of the RSUM-diet on turnover rates (TR) of plasma glucose and Leu using the isotope dilution methods along with the determination of N balances rumen characteristics and blood metabolite concentrations in sheep.
In 2008, The French Society of Clinical Biology (SFBC) conducted a multicentric evaluation of isotope dilution mass spectrometry (IDMS)-traceable creatinine enzymatic and nonstandardized cystC assays (2) using a panel of 5 off-the-clot, fresh-frozen serum pools prepared to cover concentrations critically important at initial stages of renal disease.
In the case of serum creatinine, the National Kidney Disease Education Program has led efforts over the last decade to standardize testing, including adoption of isotope dilution mass spectrometry (IDMS)-traceable references (7).
228]Th, and certain U isotopes) allow for chemical extraction and analysis by isotope dilution alpha spectrometry techniques.
8220;The ICP-MS also allows us to offer isotope dilution analysis, meaning that we will be able to analyse archaeological, blood, hair and plant samples.
Isotope dilution, dual photon, whole-body counting, hydrodensitometry, and anthropometric methods were used either alone or in combination to produce multicomponent models.
They cover the isotope dilution technique, kinetic models for studying phosphorus metabolism in ruminants and monogastrics, phosphorus and calcium utilization in ruminants and non-ruminants using the isotope dilution technique, the bioavailability of calcium and phosphorus in feedstuffs for farm animals, phosphorous and calcium nutrition and metabolism, phosphorous and calcium requirements of ruminants, the dynamics of phosphorous and calcium metabolism in laying hens, and the efficiency of phosphorous and calcium utilization in dairy cattle and implications for the environment.
The rate of lipolysis and hepatic glucose production, in the studies reviewed, were measured with stable isotope dilution technique.
It uses an isotope dilution technique for quantitation with high precision and analyzing PBDEs with ultimate selectivity.