A new analytical method for determination of the nitrogen isotopic composition of methionine: Its application to aquatic ecosystems with mixed resources
Sign Up to like & getrecommendations! Published in 2018 at "Limnology and Oceanography: Methods"
DOI: 10.1002/lom3.10272
Abstract: Compound-specific nitrogen isotope (δN) analysis of amino acids is a powerful tool for estimating the trophic positions (TPs) of animals. The TP of an animal can be represented as a linear function of the isotopic… read more here.
Keywords: food webs; amino acids; methionine; method ... See more keywords
The new face of isotopic NMR at natural abundance
Sign Up to like & getrecommendations! Published in 2017 at "Magnetic Resonance in Chemistry"
DOI: 10.1002/mrc.4548
Abstract: The most widely used method for isotope analysis at natural abundance is isotope ratio monitoring by Mass Spectrometry (irm‐MS) which provides bulk isotopic composition in 2H, 13C, 15N, 18O or 34S. However, in the 1980s,… read more here.
Keywords: new face; isotope; isotopic; irm ... See more keywords
H2 clumped isotope measurements at natural isotopic abundances
Sign Up to like & getrecommendations! Published in 2019 at "Rapid Communications in Mass Spectrometry"
DOI: 10.1002/rcm.8323
Abstract: Rationale Molecular hydrogen (H2) is an important gas for atmospheric chemistry, and an indirect greenhouse gas due to its reaction with OH. The isotopic composition of H2 (δD) has been used to investigate its atmospheric… read more here.
Keywords: isotopic abundances; isotope measurements; clumped isotope; isotopic ... See more keywords
Determination of the isotopic composition of enriched materials using laser ablation molecular isotopic spectrometry: partial least squares and multivariate curve resolution for the determination of 15N content in enriched urea
Sign Up to like & getrecommendations! Published in 2020 at "Analytical and Bioanalytical Chemistry"
DOI: 10.1007/s00216-020-02656-y
Abstract: A quantitative analytical method based on laser ablation molecular isotopic spectrometry (LAMIS) and multivariate analysis was developed and evaluated for the determination of the isotopic composition of enriched materials. The method consists preparing a concentrated… read more here.
Keywords: spectrometry; determination; laser ablation; isotopic ... See more keywords
Calcium isotopic signatures of depleted mid-ocean ridge basalts from the northeastern Pacific
Sign Up to like & getrecommendations! Published in 2020 at "Journal of Oceanology and Limnology"
DOI: 10.1007/s00343-020-0045-2
Abstract: A number of high-temperature processes (e.g., melt-rock reactions, metasomatism, partial melting) can produce significant Ca isotopic fractionation and heterogeneity in the mantle, but the mechanism for such fractionation remains obscure. To investigate the effect of… read more here.
Keywords: mantle partial; depleted mid; partial melting; isotopic fractionation ... See more keywords
‘Trophic’ and ‘source’ amino acids in trophic estimation: a likely metabolic explanation
Sign Up to like & getrecommendations! Published in 2017 at "Oecologia"
DOI: 10.1007/s00442-017-3881-9
Abstract: Amino acid nitrogen isotopic analysis is a relatively new method for estimating trophic position. It uses the isotopic difference between an individual’s ‘trophic’ and ‘source’ amino acids to determine its trophic position. So far, there… read more here.
Keywords: amino; amino acids; isotopic; trophic source ... See more keywords
Oxygen isotopic compositions of meteoric precipitation, drip water, and aragonitic stalagmite deposition from the Namjang cave in northwestern Thailand: implications for multi-proxy climate reconstruction
Sign Up to like & getrecommendations! Published in 2020 at "Theoretical and Applied Climatology"
DOI: 10.1007/s00704-020-03245-w
Abstract: Stalagmites provide one of the few high-quality proxy records of the Thailand monsoon. The Namjang (NJ) cave (19°40′30″N, 98°12′12″E; 923 m a.s.l.), which is situated in the data-scarce region of northwestern Thailand, serves as a… read more here.
Keywords: proxy climate; water; multi proxy; isotopic ... See more keywords
On the use of Pichia pastoris for isotopic labeling of human GPCRs for NMR studies
Sign Up to like & getrecommendations! Published in 2018 at "Journal of Biomolecular NMR"
DOI: 10.1007/s10858-018-0204-3
Abstract: NMR studies of human integral membrane proteins provide unique opportunities to probe structure and dynamics at specific locations and on multiple timescales, often with significant implications for disease mechanism and drug development. Since membrane proteins… read more here.
Keywords: nmr studies; isotopic; pichia pastoris; membrane proteins ... See more keywords
Combination of atomic lines and molecular bands for uranium optical isotopic analysis in laser induced plasma spectrometry
Sign Up to like & getrecommendations! Published in 2017 at "Journal of Radioanalytical and Nuclear Chemistry"
DOI: 10.1007/s10967-017-5197-y
Abstract: Through computer simulation on experimentally acquired optical spectra, uranium isotopic analysis by laser ablation molecular isotopic spectrometry and laser induced breakdown spectroscopy were studied. The use of only one spectral feature, either the strong UO… read more here.
Keywords: isotopic analysis; atomic lines; isotopic; analysis laser ... See more keywords
Rapid measurements of 235U fission product isotope ratios using an online, high-pressure ion chromatography inductively coupled plasma mass spectrometry protocol with comparison to isotopic depletion models
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Radioanalytical and Nuclear Chemistry"
DOI: 10.1007/s10967-019-06438-4
Abstract: An automated online separation–direct analysis method, RAPID (rapid analysis of post-irradiation debris), has been developed for the measurement of the concentration and isotopic composition of over 40 elements down to the low-picogram level. Here we… read more here.
Keywords: rapid measurements; measurements 235u; 235u fission; isotopic ... See more keywords
Development of non-destructive isotopic analysis methods using muon beams and their application to the analysis of lead
Sign Up to like & getrecommendations! Published in 2019 at "Journal of Radioanalytical and Nuclear Chemistry"
DOI: 10.1007/s10967-019-06506-9
Abstract: Elemental isotopic ratios are measured in various research fields and provide useful information regarding age, origin, geological and biological activities, ancient climate, etc. Here, we report a new isotopic analysis method without sample destruction using… read more here.
Keywords: isotopic analysis; analysis; using muon; isotopic ... See more keywords