Isotope-dilution mass spectrometry (IDMS) is considered to be a method without significant correction factors. It is also believed that this method is well understood. But unfortunately a large number of different uncertainty budgets have been published that consider different correction factors. These ...
The most probable source of Pb contamination in the perennial reach of Aravaipa Creek, Arizona, has been determined using Pb isotope ratios and total metal... C Young,A Alfantazi,C Anderson,... 被引量: 0发表: 2003年 The Use Of Pb Isotopes To Characterize The Fate And Transport Of Pb ...
initio analysis of NMR chemical shifts of bound ligands, we used an approach that is similar to our ab initio analysis of vibrational data: first, 15N and 1H chemical shift changes of a ligand are determined by isotope-edited NMR methods when the ligand is transferred from solution to enzyme...
Still, connecting molecules to their cognate BGCs is a substantial bottleneck for this approach. We have developed a mass-spectrometry-based parallel stable isotope labeling platform, termed IsoAnalyst, which assists in associating metabolite stable isotope labeling patterns with BGC structure prediction ...
MCF7 cells were grown for a minimum of 2 passages in SILAC media (Pierce, Thermo Scientific) containing13C615N4arginine and13C6lysine. The extent of stable isotope incorporation was determined by mass spectrometry. For the assay, cells were plated at 1.2 x 106cells/well into 6-well TC-tre...
1. δ18OVSMOW is calculated according to the equation (δ18OVSMOW = 1.03086 ×δ18OVPDB + 30.86) reported by Friedman and O’Neil (1977). Download: Download high-res image (173KB) Download: Download full-size image Fig. 15. C-O isotope data for calcites from the Shanhou Pb-Zn dep...
The Purdue Rare Isotope Measurement Laboratory (PRIME Lab) is a dedicated research and service facility for AMS that provides the scientific community with... P Sharma,M Bourgeois,D Elmore,... - 《Nuclear Instruments & Methods in Physics Research》 被引量: 235发表: 2000年 The continuing import...
the other substrates tested. Median13C enrichment ofW. gerlachensiscells incubated with labeled glucose, amino acids or starch was less than 1 atom% excess (potentially due to cross-feeding on metabolites derived from these substrates), and no isotope enrichment was detected in13C ribose incubation...
This sharp drop is due to fast mixing in the air and the relatively short half-life of 222Rn. Isotopes of radon gas and their decay products provide a unique set of tracers for the study of transport and mixing processes in a wide variety of atmospheric phenomena. The 222Rn isotope has ...
A recent development is species-specific IDA, wherebyorganometallic compoundsor elemental species can be chromatographically separated, introduced into the ICP-MS instrument, and the isotope amount ratio of the elemental moiety can be determined for the purposes of IDA. An example of this is the spe...