Search Results - "Gilbert, Alexis"

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Accurate Quantitative Isotopic 13C NMR Spectroscopy for the Determination of the Intramolecular Distribution of 13C in Glucose at Natural Abundance.

Authors: Gilbert, Alexis Silvestre, Virginie Robins, Richard J.

Source: Analytical Chemistry; November 1 2009, Vol. 81 Issue 21, p8978-8985, 8p

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Impact of the deuterium isotope effect on the accuracy of C NMR measurements of site-specific isotope ratios at natural abundance in glucose.

Authors: Gilbert, Alexis Silvestre, Virginie Robins, Richard J. et al.

Source: Analytical & Bioanalytical Chemistry. Nov2010, Vol. 398 Issue 5, p1979-1984. 6p. 1 Diagram, 2 Charts, 2 Graphs.

Standardization for ¹³C-¹³C clumped isotope analysis by the fluorination method.

Authors: Koudai Taguchi Gilbert, Alexis Yuichiro Ueno

Source: Rapid Communications in Mass Spectrometry: RCM. 7/15/2021, Vol. 35 Issue 13, p1-12. 12p.

The Organic Isotopologue Frontier.

Authors: Gilbert, Alexis¹ (AUTHOR) gilbert.a.aa@m.titech.ac.jp

Source: Annual Review of Earth & Planetary Sciences. May2021, Vol. 49, p435-464. 26p.

Intramolecular isotopic evidence for bacterial oxidation of propane in subsurface natural gas reservoirs.

Authors: Gilbert, Alexis Lollar, Barbara Sherwood Musat, Florin et al.

Source: Proceedings of the National Academy of Sciences of the United States of America. 4/2/2019, Vol. 116 Issue 14, p6653-6658. 6p.

Subjects: Intramolecular isotope effects, Anaerobic bacteria, Oxidation of propane, Gas reservoirs, Hydrocarbons

Compound– and position–specific carbon isotopic signatures of abiogenic hydrocarbons from on–land serpentinite–hosted Hakuba Happo hot spring in Japan.

Authors: Suda, Konomi Gilbert, Alexis Yamada, Keita et al.

Source: Geochimica et Cosmochimica Acta. Jun2017, Vol. 206, p201-215. 15p.

Subjects: Carbon isotopes, Hydrocarbons, Serpentinite, Propane, Hot springs

Geographic Terms: Japan

Pathway-specific bulk and clumped isotope signatures of methane production in marine sediment incubations.

Authors: Sivan, Malavika Wallenius, Anna J. Röckmann, Thomas et al.

Source: Biogeochemistry. Dec2025, Vol. 168 Issue 6, p1-21. 21p.

Advancing Stable Isotope Analysis with Orbitrap-MS for Fatty Acid Methyl Esters and Complex Lipid Matrices.

Authors: dos Santos, Gabriel F. Bevilaqua, Giovanni B. Gilbert, Alexis et al.

Source: Journal of the American Society for Mass Spectrometry. 7/2/2025, Vol. 36 Issue 7, p1527-1535. 9p.

Measurement of position-specific 13C isotopic composition of propane at the nanomole level.

Authors: Gilbert, Alexis Yamada, Keita Suda, Konomi et al.

Source: Geochimica et Cosmochimica Acta. Mar2016, Vol. 177, p205-216. 12p.

Subjects: Carbon isotopes, Propane, Methyl groups, Isotopic fractionation, Natural gas

Expanded uncertainty associated with determination of isotope enrichment factors: Comparison of two point calculation and Rayleigh-plot.

Authors: Julien, Maxime Gilbert, Alexis Yamada, Keita et al.

Source: Talanta. Jan2018, Vol. 176, p367-373. 7p.

Conditions to obtain precise and true measurements of the intramolecular 13C distribution in organic molecules by isotopic 13C nuclear magnetic resonance spectrometry.

Authors: Bayle, Kevin Gilbert, Alexis Julien, Maxime et al.

Source: Analytica Chimica Acta. Oct2014, Vol. 846, p1-7. 7p.

Subjects: Carbon isotopes, Intramolecular isotope effects, NMR spectrometers, Organic compounds, Biosynthesis, Chemical reactions, Chemical shift (Nuclear magnetic resonance)

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Authors: Gilbert, Alexis Silvestre, Virginie Robins, Richard J. et al.

Source: New Phytologist. Jul2011, Vol. 191 Issue 2, p579-588. 10p. 2 Diagrams, 3 Charts, 2 Graphs.

Subjects: Nuclear magnetic resonance spectroscopy, Fructose, Isomerization, Isotopes, Carbohydrates

Exploration of intramolecular ¹³C isotope distribution in long chain n-alkanes (C11–C31) using isotopic ¹³C NMR.

Authors: Gilbert, Alexis Yamada, Keita Yoshida, Naohiro

Source: Organic Geochemistry. Sep2013, Vol. 62, p56-61. 6p.

Subjects: Intramolecular isotope effects, Alkane analysis, Nuclear magnetic resonance spectroscopy, Isomerism, Carbon isotopes, Methyl groups

Intramolecular ¹³C pattern in hexoses from autotrophic and heterotrophic C3 plant tissues.

Authors: Gilbert, Alexis Robins, Richard J. Remaud, Gérald S. et al.

Source: Proceedings of the National Academy of Sciences of the United States of America. 10/30/2012, Vol. 109 Issue 44, p18204-18209. 6p.

Subjects: Ecophysiology, Photosynthates, Plant ecophysiology, Sucrose, Glucose, Plant cells & tissues

Accurate Method for the Determination of Intramolecular ¹³C Isotope Composition of Ethanol from Aqueous Solutions.

Authors: Gilbert, Alexis Yamada, Keita Yoshida, Naohiro

Source: Analytical Chemistry. 7/16/2013, Vol. 85 Issue 14, p6566-6570. 5p.

Subjects: Carbon isotopes, Ethanol, Solid phase extraction, Pyrolysis, Mass spectrometry, Intramolecular isotope effects, Alcoholic beverage analysis

Accurate Quantitative Isotopic ¹³C NMR Spectroscopy for the Determination of the Intramolecular Distribution of 13C in Glucose at Natural Abundance.

Authors: Gilbert, Alexis Silvestre, Virginie Robins, Richard J. et al.

Source: Analytical Chemistry. 11/1/2009, Vol. 81 Issue 21, p8978-8985. 8p.

Subjects: Glucose, Nuclear magnetic resonance spectroscopy, Isotopes, Metabolites, Carbon, Fructose, Biosynthesis

Clumped 13C–13C isotopologue signatures of thermogenic ethane.

Authors: Taguchi, Koudai Ueno, Yuichiro Gilbert, Alexis et al.

Source: Geochimica et Cosmochimica Acta. Apr2025, Vol. 394, p258-267. 10p.

Subjects: Marine sediments, Climatology, Carbon isotopes, Dingo, Ethanes

Evaluation of on-line pyrolysis coupled to isotope ratio mass spectrometry for the determination of position-specific 13C isotope composition of short chain n-alkanes (C6–C12).

Authors: Gilbert, Alexis Yamada, Keita Yoshida, Naohiro

Source: Talanta. Jun2016, Vol. 153, p158-162. 5p.