Guidelines and recommended terms for expression of stable‐isotope‐ratio and gas‐ratio measurement results Tập 25 Số 17 - Trang 2538-2560 - 2011
Tyler B. Coplen
To minimize confusion in the expression of measurement results of stable isotope
and gas‐ratio measurements, recommendations based on publications of the
Commission on Isotopic Abundances and Atomic Weights of the International Union
of Pure and Applied Chemistry (IUPAC) are presented. Whenever feasible, entries
are consistent with the Système International d'Unités, the SI (known in English
as th... hiện toàn bộ
From mass to structure: an aromaticity index for high‐resolution mass data of natural organic matter Tập 20 Số 5 - Trang 926-932 - 2006
Boris Koch, Thorsten Dittmar
AbstractRecent progress in Fourier transform ion cyclotron resonance mass
spectrometry (FTICRMS) has provided extensive molecular mass data for complex
natural organic matter (NOM). Structural information can be deduced solely from
the molecular masses for ions with extreme molecular element ratios, in
particular low H/C ratios, which are abundant in thermally altered NOM (e.g.
black carbon). In t... hiện toàn bộ
Applications of a travelling wave‐based radio‐frequency‐only stacked ring ion guide Tập 18 Số 20 - Trang 2401-2414 - 2004
Kevin Giles, Steven Pringle, Kenneth R. Worthington, David Little, Jason Wildgoose, Robert Bateman
AbstractThe use of radio‐frequency (RF)‐only ion guides for efficient transport
of ions through regions of a mass spectrometer where the background gas pressure
is relatively high is widespread in present instrumentation. Whilst multiple
collisions between ions and the background gas can be beneficial, for example in
inducing fragmentation and/or decreasing the spread in ion energies, the
resultan... hiện toàn bộ
Intact polar membrane lipids in prokaryotes and sediments deciphered by high‐performance liquid chromatography/electrospray ionization multistage mass spectrometry—new biomarkers for biogeochemistry and microbial ecology Tập 18 Số 6 - Trang 617-628 - 2004
Helen Sturt, Roger E. Summons, K. M. Smith, Marcus Elvert, Kai‐Uwe Hinrichs
AbstractLipids from prokaryotic cell membranes can serve as sources of
information on the biogeochemistry and microbial ecology of natural ecosystems.
Traditionally, apolar derivatives of the intact polar membrane molecules, e.g.,
fatty acids, have been the major target of lipid‐based biogeochemical studies.
However, when still intact, i.e., as glycerol esters and ethers with attached
polar headgr... hiện toàn bộ
UPLC/MSE; a new approach for generating molecular fragment information for biomarker structure elucidation Tập 20 Số 13 - Trang 1989-1994 - 2006
Robert S. Plumb, Kelly A. Johnson, Paul Rainville, Brian Smith, Ian D. Wilson, José Castro‐Perez, Jeremy K. Nicholson
AbstractA new approach to obtain fragmentation information in liquid
chromatography/mass spectrometry (LC/MS) studies of small molecules in complex
mixtures is presented using simultaneous acquisition of exact mass at high and
low collision energy, MSE. LC/MS‐TOF and LC/MS/MS‐TOF are powerful tools for the
analysis of complex mixtures, especially those for biological fluids allowing
the elucidatio... hiện toàn bộ