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  1. Article ; Online: There is an overlap between long covid and ME/CFS.

    Gilbert, Alexis

    BMJ (Clinical research ed.)

    2023  Volume 383, Page(s) 2462

    MeSH term(s) Humans ; Fatigue Syndrome, Chronic ; Post-Acute COVID-19 Syndrome ; COVID-19
    Language English
    Publishing date 2023-10-24
    Publishing country England
    Document type Letter ; Comment
    ZDB-ID 1362901-3
    ISSN 1756-1833 ; 0959-8154 ; 0959-8146 ; 0959-8138 ; 0959-535X ; 1759-2151
    ISSN (online) 1756-1833
    ISSN 0959-8154 ; 0959-8146 ; 0959-8138 ; 0959-535X ; 1759-2151
    DOI 10.1136/bmj.p2462
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Ua VI Zs.10: Show issues Location:
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  2. Article ; Online: We need better care for long covid and ME/CFS.

    Gilbert, Alexis

    BMJ (Clinical research ed.)

    2023  Volume 383, Page(s) 2372

    MeSH term(s) Humans ; Fatigue Syndrome, Chronic ; Post-Acute COVID-19 Syndrome ; COVID-19 ; Primary Health Care ; Qualitative Research
    Language English
    Publishing date 2023-10-17
    Publishing country England
    Document type Letter ; Comment
    ZDB-ID 1362901-3
    ISSN 1756-1833 ; 0959-8154 ; 0959-8146 ; 0959-8138 ; 0959-535X ; 1759-2151
    ISSN (online) 1756-1833
    ISSN 0959-8154 ; 0959-8146 ; 0959-8138 ; 0959-535X ; 1759-2151
    DOI 10.1136/bmj.p2372
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

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  3. Article ; Online: Standardization for

    Taguchi, Koudai / Gilbert, Alexis / Ueno, Yuichiro

    Rapid communications in mass spectrometry : RCM

    2021  Volume 35, Issue 13, Page(s) e9109

    Abstract: Rationale: The : Methods: We prepared physical mixtures of : Results: The measured ∆: Conclusions: For typical analysis of natural samples, scrambling in the ion source can only change the ∆ ...

    Abstract Rationale: The
    Methods: We prepared physical mixtures of
    Results: The measured ∆
    Conclusions: For typical analysis of natural samples, scrambling in the ion source can only change the ∆
    Language English
    Publishing date 2021-04-21
    Publishing country England
    Document type Journal Article
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.9109
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3461: Show issues Location:
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  4. Article: Hydrocarbon Cycling in the Tokamachi Mud Volcano (Japan): Insights from Isotopologue and Metataxonomic Analyses

    Gilbert, Alexis / Nakagawa, Mayuko / Taguchi, Koudai / Zhang, Naizhong / Nishida, Akifumi / Yoshida, Naohiro

    Microorganisms. 2022 July 14, v. 10, no. 7

    2022  

    Abstract: Understanding hydrocarbon cycling in the subsurface is important in various disciplines including climate science, energy resources and astrobiology. Mud volcanoes provide insights into biogeochemical processes occurring in the subsurface. They are ... ...

    Abstract Understanding hydrocarbon cycling in the subsurface is important in various disciplines including climate science, energy resources and astrobiology. Mud volcanoes provide insights into biogeochemical processes occurring in the subsurface. They are usually associated with natural gas reservoirs consisting mainly of methane and other hydrocarbons as well as CO₂. Stable isotopes have been used to decipher the sources and sinks of hydrocarbons in the subsurface, although the interpretation can be ambiguous due to the numerous processes involved. Here we report new data for hydrocarbon isotope analysis, including position-specific isotope composition of propane, for samples from the Tokamachi mud volcano area, Japan. The data suggest that C₂₊ hydrocarbons are being biodegraded, with indirect production of methane (“secondary methanogenesis”). Data from chemical and isotopic composition are discussed with regard to 16S rRNA analysis, which exhibits the presence of hydrogenotrophic and acetoclastic methoanogens. Overall, the combination of isotopologue analysis with 16S rRNA gene data allows refining of our understanding of hydrocarbon cycling in subsurface environments.
    Keywords Japan ; carbon dioxide ; climate ; energy ; genes ; methane ; natural gas ; propane
    Language English
    Dates of publication 2022-0714
    Publishing place Multidisciplinary Digital Publishing Institute
    Document type Article
    ZDB-ID 2720891-6
    ISSN 2076-2607
    ISSN 2076-2607
    DOI 10.3390/microorganisms10071417
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Hydrocarbon Cycling in the Tokamachi Mud Volcano (Japan): Insights from Isotopologue and Metataxonomic Analyses.

    Gilbert, Alexis / Nakagawa, Mayuko / Taguchi, Koudai / Zhang, Naizhong / Nishida, Akifumi / Yoshida, Naohiro

    Microorganisms

    2022  Volume 10, Issue 7

    Abstract: Understanding hydrocarbon cycling in the subsurface is important in various disciplines including climate science, energy resources and astrobiology. Mud volcanoes provide insights into biogeochemical processes occurring in the subsurface. They are ... ...

    Abstract Understanding hydrocarbon cycling in the subsurface is important in various disciplines including climate science, energy resources and astrobiology. Mud volcanoes provide insights into biogeochemical processes occurring in the subsurface. They are usually associated with natural gas reservoirs consisting mainly of methane and other hydrocarbons as well as CO
    Language English
    Publishing date 2022-07-14
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2720891-6
    ISSN 2076-2607
    ISSN 2076-2607
    DOI 10.3390/microorganisms10071417
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: A fluorination method for measuring the

    Taguchi, Koudai / Yamamoto, Tomonari / Nakagawa, Mayuko / Gilbert, Alexis / Ueno, Yuichiro

    Rapid communications in mass spectrometry : RCM

    2020  Volume 34, Issue 11, Page(s) e8761

    Abstract: Rationale: Doubly substituted isotope species ("clumped" isotopes) can provide insights into the biogeochemical history of a molecule, including its temperature of formation and/or its (bio)synthetic pathway. Here, we propose a new fluorination method ... ...

    Abstract Rationale: Doubly substituted isotope species ("clumped" isotopes) can provide insights into the biogeochemical history of a molecule, including its temperature of formation and/or its (bio)synthetic pathway. Here, we propose a new fluorination method for the measurement of
    Methods: 13
    Results: The reproducibility of the whole protocol, including chemical modification steps and measurement of C
    Conclusions: The method presented here provides alternative means of measuring
    Language English
    Publishing date 2020-04-17
    Publishing country England
    Document type Journal Article
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.8761
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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3461: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (2.OG)
    ab Jg. 2022: Lesesaal (EG)

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  7. Article ; Online: Low

    Taguchi, Koudai / Gilbert, Alexis / Sherwood Lollar, Barbara / Giunta, Thomas / Boreham, Christopher J / Liu, Qi / Horita, Juske / Ueno, Yuichiro

    Nature communications

    2022  Volume 13, Issue 1, Page(s) 5790

    Abstract: Distinguishing biotic compounds from abiotic ones is important in resource geology, biogeochemistry, and the search for life in the universe. Stable isotopes have traditionally been used to discriminate the origins of organic materials, with particular ... ...

    Abstract Distinguishing biotic compounds from abiotic ones is important in resource geology, biogeochemistry, and the search for life in the universe. Stable isotopes have traditionally been used to discriminate the origins of organic materials, with particular focus on hydrocarbons. However, despite extensive efforts, unequivocal distinction of abiotic hydrocarbons remains challenging. Recent development of clumped-isotope analysis provides more robust information because it is independent of the stable isotopic composition of the starting material. Here, we report data from a
    MeSH term(s) Carbon Isotopes ; Earth, Planet ; Ethane ; Geology ; Hydrocarbons/chemistry ; Isotopes
    Chemical Substances Carbon Isotopes ; Hydrocarbons ; Isotopes ; Ethane (L99N5N533T)
    Language English
    Publishing date 2022-10-02
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't ; Research Support, U.S. Gov't, Non-P.H.S.
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-022-33538-9
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article: 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)

    Gilbert, Alexis / Keita Yamada / Naohiro Yoshida

    Talanta. 2016 June 01, v. 153

    2016  

    Abstract: We measured 13C intramolecular isotopic composition of commercially available short-chain hydrocarbons (n-C6–n-C12) using 13C-NMR. Results show that the main variation is between the terminal and the sub-terminal C-atom positions. Site-preference ( ... ...

    Abstract We measured 13C intramolecular isotopic composition of commercially available short-chain hydrocarbons (n-C6–n-C12) using 13C-NMR. Results show that the main variation is between the terminal and the sub-terminal C-atom positions. Site-preference (difference in δ13C values between terminal and sub-terminal C-atom positions) among all the samples varies between −12.2‰ and +8.4‰.Comparison of these results with those obtained using on-line pyrolysis coupled with GC-C-IRMS show that the thermal cracking of hydrocarbons occurs with a good isotopic fidelity between terminal and sub-terminal C-atom positions of the starting material and the related pyrolysis products (methane and ethylene). On-line pyrolysis coupled with GC-C-IRMS can thus be used for tracing hydrocarbons biogeochemical processes.
    Keywords carbon ; ethylene ; mass spectrometry ; methane ; nuclear magnetic resonance spectroscopy ; pyrolysis ; stable isotopes ; thermal cracking
    Language English
    Dates of publication 2016-0601
    Size p. 158-162.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2016.03.014
    Database NAL-Catalogue (AGRICOLA)

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

    Gilbert, Alexis / Yamada, Keita / Yoshida, Naohiro

    Talanta

    2016  Volume 153, Page(s) 158–162

    Abstract: We measured (13)C intramolecular isotopic composition of commercially available short-chain hydrocarbons (n-C6-n-C12) using (13)C-NMR. Results show that the main variation is between the terminal and the sub-terminal C-atom positions. Site-preference ( ... ...

    Abstract We measured (13)C intramolecular isotopic composition of commercially available short-chain hydrocarbons (n-C6-n-C12) using (13)C-NMR. Results show that the main variation is between the terminal and the sub-terminal C-atom positions. Site-preference (difference in δ(13)C values between terminal and sub-terminal C-atom positions) among all the samples varies between -12.2‰ and +8.4‰. Comparison of these results with those obtained using on-line pyrolysis coupled with GC-C-IRMS show that the thermal cracking of hydrocarbons occurs with a good isotopic fidelity between terminal and sub-terminal C-atom positions of the starting material and the related pyrolysis products (methane and ethylene). On-line pyrolysis coupled with GC-C-IRMS can thus be used for tracing hydrocarbons biogeochemical processes.
    Language English
    Publishing date 2016--01
    Publishing country Netherlands
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 1500969-5
    ISSN 1873-3573 ; 0039-9140
    ISSN (online) 1873-3573
    ISSN 0039-9140
    DOI 10.1016/j.talanta.2016.03.014
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: Analytical method for simultaneous determination of bulk and intramolecular (13) C-isotope compositions of acetic acid.

    Nimmanwudipong, Tarin / Gilbert, Alexis / Yamada, Keita / Yoshida, Naohiro

    Rapid communications in mass spectrometry : RCM

    2015  Volume 29, Issue 24, Page(s) 2337–2340

    Abstract: Rationale: Headspace solid-phase microextraction (HS-SPME) combined with gas chromatography/pyrolysis-gas chromatography/combustion-isotope ratio mass spectrometry (GC/Py-GC/C-IRMS) was developed for the simultaneous determination of the intramolecular ... ...

    Abstract Rationale: Headspace solid-phase microextraction (HS-SPME) combined with gas chromatography/pyrolysis-gas chromatography/combustion-isotope ratio mass spectrometry (GC/Py-GC/C-IRMS) was developed for the simultaneous determination of the intramolecular and molecular carbon-isotopic composition (δ(13) C value) of acetic acid.
    Methods: The δ(13) C values of carboxyl and methyl carbon were standardized using calibration curves constructed from the regression between the measured δ(13) C values and the δ(13) C values of working standards determined in a previous study. We applied this developed HS-SPME-GC/Py-GC/C-IRMS technique to commercial vinegars.
    Results: In one injection analysis, the bulk and intramolecular δ(13) C values of pure acetic acid standards can be obtained. The repeatability (1σ) of the bulk δ(13) C values is within ±0.4‰, and that of the δ(13) Ccarboxyl and δ(13) Cmethyl values is within ±0.6‰. The intramolecular δ(13) C values of acetic acid in vinegars exhibit a similar pattern. The average Δδ value (δ(13) CCOOH - δ(13) CCH3 ) is 4.3 ± 2.0‰.
    Conclusions: The approach presented herein for the molecular and intramolecular δ(13) C determination of acetic acid avoids switching between configuration systems and thereby reduces systematic errors. It is expected to be useful for examining isotope fractionation associated with processes related to organic acid (bio)transformations.
    MeSH term(s) Acetic Acid/analysis ; Acetic Acid/chemistry ; Carbon Isotopes/analysis ; Food Analysis ; Gas Chromatography-Mass Spectrometry/methods ; Reproducibility of Results ; Solid Phase Microextraction/methods
    Chemical Substances Carbon Isotopes ; Acetic Acid (Q40Q9N063P)
    Language English
    Publishing date 2015-12-30
    Publishing country England
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 58731-x
    ISSN 1097-0231 ; 0951-4198
    ISSN (online) 1097-0231
    ISSN 0951-4198
    DOI 10.1002/rcm.7398
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