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  • 1
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    From Source to Seep: Geochemical Applications in Hydrocarbon Systems (2018)
    London : The Geological Society
    Details
    Keywords: geochemical techniques ; isotopic techniques ; hydrocarbon systems
    Description / Table of Contents: Geochemical applications in petroleum systems analysis: new constraints and the power of integration / M. Lawson, M. J. Formolo, L. Summa and J. M. Eiler / Geological Society, London, Special Publications, 468, 1-21, 19 February 2018, https://doi.org/10.1144/SP468.6 --- Source-rock identification and the temperature/timing of hydrocarbon generation --- The utility of methane clumped isotopes to constrain the origins of methane in natural gas accumulations / Daniel A. Stolper, Michael Lawson, Michael J. Formolo, Cara L. Davis, Peter M. J. Douglas and John M. Eiler / Geological Society, London, Special Publications, 468, 23-52, 14 December 2017, https://doi.org/10.1144/SP468.3 --- The isotopic structures of geological organic compounds / John M. Eiler, Matthieu Clog, Michael Lawson, Max Lloyd, Alison Piasecki, Camilo Ponton and Hao Xie / Geological Society, London, Special Publications, 468, 53-81, 14 December 2017, https://doi.org/10.1144/SP468.4 --- Vanadium isotope composition of crude oil: effects of source, maturation and biodegradation / Yongjun Gao, John F. Casey, Luis M. Bernardo, Weihang Yang and K. K. (Adry) Bissada / Geological Society, London, Special Publications, 468, 83-103, 14 December 2017, https://doi.org/10.1144/SP468.2 --- Carbon and hydrogen isotopic compositions of n-alkanes as a tool in petroleum exploration / Nikolai Pedentchouk and Courtney Turich / Geological Society, London, Special Publications, 468, 105-125, 14 December 2017, https://doi.org/10.1144/SP468.1 --- Mechanisms and time-scales associated with hydrocarbon migration, trapping, storage and alteration --- Noble gases in conventional and unconventional petroleum systems / David J. Byrne, P. H. Barry, M. Lawson and C. J. Ballentine / Geological Society, London, Special Publications, 468, 127-149, 14 December 2017, https://doi.org/10.1144/SP468.5 --- Differentiating between biogenic and thermogenic sources of natural gas in coalbed methane reservoirs from the Illinois Basin using noble gas and hydrocarbon geochemistry / Myles T. Moore, David S. Vinson, Colin J. Whyte, William K. Eymold, Talor B. Walsh and Thomas H. Darrah / Geological Society, London, Special Publications, 468, 151-188, 18 January 2018, https://doi.org/10.1144/SP468.8 --- The impact of fluid flow on reservoir properties --- Testing clumped isotopes as a reservoir characterization tool: a comparison with fluid inclusions in a dolomitized sedimentary carbonate reservoir buried to 2–4 km / John M. MacDonald, Cédric M. John and Jean-Pierre Girard / Geological Society, London, Special Publications, 468, 189-202, 14 December 2017, https://doi.org/10.1144/SP468.7
    Pages: Online-Ressource (208 Seiten) , Diagramme
    ISBN: 9781786203687
    URL: https://sp.lyellcollection.org/content/468/1
    Language: English
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    Nature and cumulative stability constants of copper(I) complexes of some substituted thioureas (1976)
    s.l. : American Chemical Society
    Inorganic chemistry 15 (1976), S. 940-943 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50158a042
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Developing German writing skills by way of Timbuktu (1996)
    Cambridge : Cambridge University Press
    Recall 8 (1996), S. 12-19 
    Details
    ISSN: 0958-3440
    Source: Cambridge Journals Digital Archives
    Topics: Linguistics and Literary Studies , Computer Science
    Notes: This paper reports on a pilot project which examined the effects on essay writing skills in advanced German of computer-based teaching which allowed a co-operative approach to writing and the pmvision of immediate teacher and peer feedback through the interactive display and networking of student work.Third year German students were assigned to computer-based or conventional teaching groups taught by two different teachers using common materials and the same task-based approach. Prior to implementation of the project and again at the end, students were given a standard writing task to allow the level of their writing skills to be evaluated structurally and linguistically. The major focus was on the development of arguments, together with appropriate intmductions and conclusions. Grammar and expression were also measured to check whether the absence of an explicit focus on grammar had a detrimental effect on accuracy.The students in these two groups along with all other third year German students completed a questionnaire that elicited information about their abilities and interest in German and their attitude to the use of computers. Teacher evaluation and qualitative data were obtained from participating students at the end of the project. Results indicated that the experimental students achieved significantly higher ratings for the logical linking of ideas in the body of their essays and were positive about the technology.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1017/S0958344000003359
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  • 4
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    Methane clumped isotopes: Progress and potential for a new isotopic tracer (2018)
    Details
    Publication Date: 2021-05-11
    Description: The isotopic composition of methane is of longstanding geochemical interest, with important implications for understanding petroleum systems, atmospheric greenhouse gas concentrations, the global carbon cycle, and life in extreme environments. Recent analytical developments focusing on multiply substituted isotopologues (‘clumped isotopes’) are opening a valuable new window into methane geochemistry. When methane forms in internal isotopic equilibrium, clumped isotopes can provide a direct record of formation temperature, making this property particularly valuable for identifying different methane origins. However, it has also become clear that in certain settings methane clumped isotope measurements record kinetic rather than equilibrium isotope effects. Here we present a substantially expanded dataset of methane clumped isotope analyses, and provide a synthesis of the current interpretive framework for this parameter. In general, clumped isotope measurements indicate plausible formation temperatures for abiotic, thermogenic, and microbial methane in many geological environments, which is encouraging for the further development of this measurement as a geothermometer, and as a tracer for the source of natural gas reservoirs and emissions. We also highlight, however, instances where clumped isotope derived temperatures are higher than expected, and discuss possible factors that could distort equilibrium formation temperature signals. In microbial methane from freshwater ecosystems, in particular, clumped isotope values appear to be controlled by kinetic effects, and may ultimately be useful to study methanogen metabolism.
    Description: Published
    Description: 262-282
    Description: 6A. Geochimica per l'ambiente
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
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    Noble Gases in Deepwater Oils of the U.S. Gulf of Mexico (2019)
    American Geophysical Union
    Details
    Publication Date: 2019-01-07
    Description: Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Noble gases in deepwater oils of the U.S. Gulf of Mexico. Geochemistry, Geophysics, Geosystems , 19, 4218 – 4235.(2018): doi:10.1029/2018GC007654.
    Description: Hydrocarbon migration and emplacement processes remain underconstrained despite the vast potential economic value associated with oil and gas. Noble gases provide information about hydrocarbon generation, fluid migration pathways, reservoir conditions, and the relative volumes of oil versus water in the subsurface. Produced gas He-Ne-Ar-Kr-Xe data from two distinct oil fields in the Gulf of Mexico (Genesis and Hoover-Diana) are used to calibrate a model that takes into account both water-oil solubility exchange and subsequent gas cap formation. Reconstructed noble gas signatures in oils reflect simple (two-phase) oil-water exchange imparted during migration from the source rock to the trap, which are subsequently modified by gas cap formation at current reservoir conditions. Calculated, oil to water volume ratios (Vo/Vw) in Tertiary-sourced oils from the Hoover-Diana system are 2–3 times greater on average than those in the Jurassic sourced oils from the Genesis reservoirs. Higher Vo/Vw in Hoover-Diana versus Genesis can be interpreted in two ways: either (1) the Hoover reservoir interval has 2–3 times more oil than any of the individual Genesis reservoirs, which is consistent with independent estimates of oil in place for the respective reservoirs, or (2) Genesis oils have experienced longer migration pathways than Hoover-Diana oils and thus have interacted with more water. The ability to determine a robust Vo/Vw , despite gas cap formation and possible gas cap loss, is extremely powerful. For example, when volumetric hydrocarbon ratios are combined with independent estimates of hydrocarbon migration distance and/or formation fluid volumes, this technique has the potential to differentiate between large and small oil accumulations.
    Description: We thank ExxonMobil for funding and providing the samples. In addition, we thank James Scott and two anonymous reviewers for their comprehensive and constructive reviews, as well as Janne Blichert-Toft for editorial handling.
    Description: 2019-04-10
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 6
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    Noble gases in deepwater oils of the U.S. Gulf of Mexico (2019)
    American Geophysical Union
    Details
    Publication Date: 2022-08-31
    Description: Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 19(11), (2018): 4218-4235. doi: 10.1029/2018GC007654
    Description: Hydrocarbon migration and emplacement processes remain underconstrained despite the vast potential economic value associated with oil and gas. Noble gases provide information about hydrocarbon generation, fluid migration pathways, reservoir conditions, and the relative volumes of oil versus water in the subsurface. Produced gas He‐Ne‐Ar‐Kr‐Xe data from two distinct oil fields in the Gulf of Mexico (Genesis and Hoover‐Diana) are used to calibrate a model that takes into account both water‐oil solubility exchange and subsequent gas cap formation. Reconstructed noble gas signatures in oils reflect simple (two‐phase) oil‐water exchange imparted during migration from the source rock to the trap, which are subsequently modified by gas cap formation at current reservoir conditions. Calculated, oil to water volume ratios (Vo/Vw) in Tertiary‐sourced oils from the Hoover‐Diana system are 2–3 times greater on average than those in the Jurassic sourced oils from the Genesis reservoirs. Higher Vo/Vw in Hoover‐Diana versus Genesis can be interpreted in two ways: either (1) the Hoover reservoir interval has 2–3 times more oil than any of the individual Genesis reservoirs, which is consistent with independent estimates of oil in place for the respective reservoirs, or (2) Genesis oils have experienced longer migration pathways than Hoover‐Diana oils and thus have interacted with more water. The ability to determine a robust Vo/Vw, despite gas cap formation and possible gas cap loss, is extremely powerful. For example, when volumetric hydrocarbon ratios are combined with independent estimates of hydrocarbon migration distance and/or formation fluid volumes, this technique has the potential to differentiate between large and small oil accumulations.
    Description: We thank ExxonMobil for funding and providing the samples. In addition, we thank James Scott and two anonymous reviewers for their comprehensive and constructive reviews, as well as Janne Blichert‐Toft for editorial handling.
    Description: 2019-04-10
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 7
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    Rapid microbial methanogenesis during CO2 storage in hydrocarbon reservoirs (2022)
    Nature Research
    Details
    Publication Date: 2022-05-27
    Description: © The Author(s), 2021. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Tyne, R. L., Barry, P. H., Lawson, M., Byrne, D. J., Warr, O., Xie, H., Hillegonds, D. J., Formolo, M., Summers, Z. M., Skinner, B., Eiler, J. M., & Ballentine, C. J. Rapid microbial methanogenesis during CO2 storage in hydrocarbon reservoirs. Nature, 600(7890), (2021): 670-674, https://doi.org/10.1038/s41586-021-04153-3.
    Description: Carbon capture and storage (CCS) is a key technology to mitigate the environmental impact of carbon dioxide (CO2) emissions. An understanding of the potential trapping and storage mechanisms is required to provide confidence in safe and secure CO2 geological sequestration1,2. Depleted hydrocarbon reservoirs have substantial CO2 storage potential1,3, and numerous hydrocarbon reservoirs have undergone CO2 injection as a means of enhanced oil recovery (CO2-EOR), providing an opportunity to evaluate the (bio)geochemical behaviour of injected carbon. Here we present noble gas, stable isotope, clumped isotope and gene-sequencing analyses from a CO2-EOR project in the Olla Field (Louisiana, USA). We show that microbial methanogenesis converted as much as 13–19% of the injected CO2 to methane (CH4) and up to an additional 74% of CO2 was dissolved in the groundwater. We calculate an in situ microbial methanogenesis rate from within a natural system of 73–109 millimoles of CH4 per cubic metre (standard temperature and pressure) per year for the Olla Field. Similar geochemical trends in both injected and natural CO2 fields suggest that microbial methanogenesis may be an important subsurface sink of CO2 globally. For CO2 sequestration sites within the environmental window for microbial methanogenesis, conversion to CH4 should be considered in site selection.
    Description: R.L.T. was supported by a Natural Environment Research Council studentship (grant reference NE/L002612/1). C.J.B. and P.H.B. acknowledge A. Regberg and B. Meurer for their support of the project and help with sample collection. C.J.B. was part supported by an Earth4D CIFAR fellowship. P.H.B. was supported by NSF awards 1923915 and 2015789. O.W. was supported by Natural Sciences and Engineering Research Council of Canada Discovery and Accelerator grants awarded to the Sherwood Lollar research group and acknowledges B. Sherwood Lollar’s support for the project. Z.M.S. acknowledges J. Biddle and G. Christman for their help in generating the microbial data.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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  • 8
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    Ligand-induced and small-molecule control of substrate loading in a hexameric helicase (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-11-07
    Description: Processive, ring-shaped protein and nucleic acid protein translocases control essential biochemical processes throughout biology and are considered high-prospect therapeutic targets. TheEscherichia coliRho factor is an exemplar hexameric RNA translocase that terminates transcription in bacteria. As with many ring-shaped motor proteins, Rho activity is modulated by a variety of poorly understood mechanisms, including small-molecule therapeutics, protein–protein interactions, and the sequence of its translocation substrate. Here, we establish the mechanism of action of two Rho effectors, the antibiotic bicyclomycin and nucleic acids that bind to Rho’s primary RNA recruitment site. Using small-angle X-ray scattering and a fluorescence-based assay to monitor the ability of Rho to switch between open-ring (RNA-loading) and closed-ring (RNA-translocation) states, we found bicyclomycin to be a direct antagonist of ring closure. Reciprocally, the binding of nucleic acids to its N-terminal RNA recruitment domains is shown to promote the formation of a closed-ring Rho state, with increasing primary-site occupancy providing additive stimulatory effects. This study establishes bicyclomycin as a conformational inhibitor of Rho ring dynamics, highlighting the utility of developing assays that read out protein conformation as a prospective screening tool for ring-ATPase inhibitors. Our findings further show that the RNA sequence specificity used for guiding Rho-dependent termination derives in part from an intrinsic ability of the motor to couple the recognition of pyrimidine patterns in nascent transcripts to RNA loading and activity.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 9
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    Isotopic evidence for quasi-equilibrium chemistry in thermally mature natural gases (2020)
    National Academy of Sciences
    Details
    Publication Date: 2020-02-11
    Description: Natural gas is a key energy resource, and understanding how it forms is important for predicting where it forms in economically important volumes. However, the origin of dry thermogenic natural gas is one of the most controversial topics in petroleum geochemistry, with several differing hypotheses proposed, including kinetic processes (such as thermal cleavage, phase partitioning during migration, and demethylation of aromatic rings) and equilibrium processes (such as transition metal catalysis). The dominant paradigm is that it is a product of kinetically controlled cracking of long-chain hydrocarbons. Here we show that C2+n-alkane gases (ethane, propane, butane, and pentane) are initially produced by irreversible cracking chemistry, but, as thermal maturity increases, the isotopic distribution of these species approaches thermodynamic equilibrium, either at the conditions of gas formation or during reservoir storage, becoming indistinguishable from equilibrium in the most thermally mature gases. We also find that the pair of CO2 and C1 (methane) exhibit a separate pattern of mutual isotopic equilibrium (generally at reservoir conditions), suggesting that they form a second, quasi-equilibrated population, separate from the C2 to C5 compounds. This conclusion implies that new approaches should be taken to predicting the compositions of natural gases as functions of time, temperature, and source substrate. Additionally, an isotopically equilibrated state can serve as a reference frame for recognizing many secondary processes that may modify natural gases after their formation, such as biodegradation.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Molecular mechanisms of substrate-controlled ring dynamics and substepping in a nucleic acid-dependent hexameric motor (2016)
    National Academy of Sciences
    Details
    Publication Date: 2016-11-16
    Description: Ring-shaped hexameric helicases and translocases support essential DNA-, RNA-, and protein-dependent transactions in all cells and many viruses. How such systems coordinate ATPase activity between multiple subunits to power conformational changes that drive the engagement and movement of client substrates is a fundamental question. Using theEscherichia coliRho transcription termination factor as a model system, we have used solution and crystallographic structural methods to delineate the range of conformational changes that accompany distinct substrate and nucleotide cofactor binding events. Small-angle X-ray scattering data show that Rho preferentially adopts an open-ring state in solution and that RNA and ATP are both required to cooperatively promote ring closure. Multiple closed-ring structures with different RNA substrates and nucleotide occupancies capture distinct catalytic intermediates accessed during translocation. Our data reveal how RNA-induced ring closure templates a sequential ATP-hydrolysis mechanism, provide a molecular rationale for how the Rho ATPase domains distinguishes between distinct RNA sequences, and establish structural snapshots of substepping events in a hexameric helicase/translocase.
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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