abundance ratio

abundance ratio

[ə′bən·dəns ′rā·shō]
(nucleonics)
The ratio of the number of atoms of one isotope to the total number of atoms in a mixture of isotopes. Also known as abundance.
References in periodicals archive ?
The AOA:AOB amoA gene abundance ratio was significantly different between WA and SA (Fig.
In 1961, Osterbrock and Rogerson would elegantly summarize the situation relative to estimating helium abundances in the Sun: "Though helium is observed in the upper chromo-sphere and in prominences, the physical conditions in these regions are too complicated and imperfectly understood for the abundance ratio to be determined from measurements of these emission lines.
Gough had already suggested that helioseismology could be used to help establish fractional abundances: " Thus one might anticipate inferring the hydrogen-helium abundance ratio by comparing the measured values with a sequence of model solar envelopes" [19, p.
Fenofibrate generated parent ions at m/z 361 and 363 in an abundance ratio of 3:1, a distinctive pattern related to the presence of chlorine in the chemical composition.
When used with Xcalibur's new Data Dependent(TM) Mass Tagging feature, XPRESS accurately reconstructs the ion chromatograms of the light and heavy ICAT(TM) reagent-labeled peptides and calculates the abundance ratio based on the relative areas of the peptide peaks.
From duplicate IDMS analyses in each of 16 analytical runs, we determined the mean ion abundance ratio of each of the five amino acids for every pool in the AARM series.
Visual inspection of ion abundance ratios plotted vs enriched amino acid concentrations showed an ion abundance ratio for Tyr in pool E that was much lower than expected.
The isotope abundance ratios were a particularly important clue, because they could reveal where the iron came from-one variant pointed to iron from the ancient Loess Plateau of northern China, a frequent source of iron-rich dust in the northwest Pacific, while another suggested the younger, more volcanic continental shelf was the iron source.
This is possibly an independent test on the dating, since the abundance ratios of these microscopic marine animals are ubiquitous.
The potential new indicator was selected by examining the Relative Abundance Ratios (RARs).
Quantification of octanoylcarnitine was achieved by converting the ion abundance ratios of octanoylcarnitine to [[sup.