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  • Journal article
    Sephton MA, Wright IP, Gilmour I, de Leeuw JW, Grady MM, Pillinger CTet al., 2002,

    High molecular weight organic matter in martian meteorites

    , PLANETARY AND SPACE SCIENCE, Vol: 50, Pages: 711-716, ISSN: 0032-0633
  • Journal article
    Sephton MA, 2002,

    Organic compounds in carbonaceous meteorites

    , NATURAL PRODUCT REPORTS, Vol: 19, Pages: 292-311, ISSN: 0265-0568
  • Conference paper
    Sephton MA, Veefkind RJ, Looy CV, Visscher H, Brinkhuis H, de Leeuw JWet al., 2002,

    Lateral variations in end-Permian organic matter in northern Italy

    , 3rd Workshop of the European-Science-Foundation IMPACT Programme, Publisher: SPRINGER-VERLAG BERLIN, Pages: 11-24
  • Conference paper
    Sephton MA, Looy CV, Veefkind RJ, Brinkhuis H, De Leeuw JW, Visscher Het al., 2002,

    Synchronous record of delta C-13 shifts in the oceans and atmosphere at the end of the Permian

    , International Interdisciplinary Conference on Catastrophic Events and Mass Extinctions - Impacts and Beyond, Pages: 455-462

    In conjunction with the profound ecologic crisis at the end of the Permian, the most conspicuous geochemical event is the worldwide negative shift in the carbon isotopic composition (delta(13)C) of both carbonates and sedimentary organic matter. Comparative carbon isotopic analyses of carbonates and the molecular fossils of land plant leaf cuticles from a marine Permian-Triassic transition section in the southern Alps, northeastern Italy, substantiates the concept of synchronous disturbances in oceanic and atmospheric chemistry and, therefore, verifies the primary nature of the end-Permian delta(13)C disturbance. The delta(13)C excursion appears to be a consequence of the ecological crisis, and the global reservoir of soil organic matter may be the only plausible source of C-13-depleted carbon.
  • Book
    Sephton MA, Smith S, 2002,

    Landforms and cycles

    , London, Publisher: Open University Press, ISBN: 9780749252076
  • Journal article
    Sephton MA, 2001,

    Life's sweet beginnings?

    , Nature, Vol: 414, Pages: 857-858, ISSN: 0028-0836
  • Journal article
    Sephton MA, Gilmour I, 2001,

    Compound-specific isotope analysis of the organic constituents in carbonaceous chondrites

    , MASS SPECTROMETRY REVIEWS, Vol: 20, Pages: 111-120, ISSN: 0277-7037
  • Journal article
    Sephton MA, Gilmour I, 2001,

    Pyrolysis-gas chromatography-isotope ratio mass spectrometry of macromolecular material in meteorites

    , PLANETARY AND SPACE SCIENCE, Vol: 49, Pages: 465-471, ISSN: 0032-0633
  • Journal article
    Jones DM, Watson JS, Meredith W, Chen M, Bennett Bet al., 2001,

    Determination of naphthenic acids in crude oils using nonaqueous ion exchange solid-phase

    , Analytical Chemistry, Vol: 73, Pages: 703-707, ISSN: 0003-2700

    A method is presented for the routine, rapid, and quantitative analysis of aliphatic and naphthenic acids in crude oils, based on their isolation using nonaqueous ion exchange solid-phase extraction cartridges. The isolated acid fractions are methylated and analyzed by gas chromatography and gas chromatography/mass spectrometry. The method is effective on both light and heavy oils and is capable of providing mechanistic information of geochemical significance on the origin of the acids in the oils. Analysis of oils that were solvent extracted from laboratory and field mesocosm marine sediment oil degradation studies indicate that this new method of analyzing the products of hydrocarbon biodegradation may be a useful tool for monitoring the progress of bioremediation of oil spills in the environment.
  • Journal article
    Sephton MA, Pillinger CT, Gilmour I, 2001,

    Normal alkanes in meteorites:: molecular δ<SUP>13</SUP>C values indicate an origin by terrestrial contamination

    , PRECAMBRIAN RESEARCH, Vol: 106, Pages: 47-58, ISSN: 0301-9268
  • Journal article
    Sephton MA, Pillinger CT, Gilmour I, 2001,

    Supercritical fluid extraction of the non-polar organic compounds in meteorites

    , PLANETARY AND SPACE SCIENCE, Vol: 49, Pages: 101-106, ISSN: 0032-0633
  • Journal article
    Sephton MA, Gilmour I, 2000,

    Aromatic moieties in meteorites: Relics of interstellar grain processes?

    , ASTROPHYSICAL JOURNAL, Vol: 540, Pages: 588-591, ISSN: 0004-637X
  • Journal article
    Sephton MA, Pillinger CT, Gilmour I, 2000,

    Aromatic moieties in meteoritic macromolecular materials:: Analyses by hydrous pyrolysis and δ<SUP>13</SUP>C of individual compounds

    , GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 64, Pages: 321-328, ISSN: 0016-7037
  • Conference paper
    Sephton M, Gilmour I, 2000,

    Macromolecular organic materials in carbonaceous chondrites: A review of their sources and their role in the origin of life on the early Earth

    , 1st Workshop of the European-Science-Foundation Scientific Program, Publisher: SPRINGER-VERLAG BERLIN, Pages: 27-49, ISSN: 0930-0317
  • Conference paper
    Sephton MA, Pillinger CT, Gilmour I, 2000,

    Supercritical fluid extraction of the organic compounds in the Cold Bokkeveld meteorite

    , Lorraine, 7th Meeting on Supercritical Fluids: Particle Design - Materials and Natural Products Processing, Antibes, France, December 6-8, Publisher: International Society for the Advancement of Supercritical Fluids, Pages: 839-844
  • Journal article
    Sephton MA, Pillinger CT, Gilmour I, 1999,

    Small-scale hydrous pyrolysis of macromolecular material in meteorites

    , PLANETARY AND SPACE SCIENCE, Vol: 47, Pages: 181-187, ISSN: 0032-0633
  • Book chapter
    Watson JS, Jones DM, Swannell RPJ, 1999,

    Formation of carboxylic acids during biodegradation of crude oil

    , In situ bioremediation of petroleum hydrocarbon and other organic compounds, Editors: Alleman, Leeson, Publisher: Battelle Pr, Pages: 251-255, ISBN: 9781574770766
  • Conference paper
    Sephton MA, Pillinger CT, Gilmour I, 1999,

    Investigating the constitution of macromolecular material in meteorites using hydrous pyrolysis

    , Illinois, Preprints, Division of Fuel Chemistry, 217th ACS National Meeting: Role of Water in Chemical Reactions, Anaheim, USA, 1999, Publisher: American Chemical Society, Pages: 368-372, ISSN: 0569-3772
  • Journal article
    Sephton MA, Looy CV, Veefkind RJ, Visscher H, Brinkhuis H, de Leeuw JWet al., 1999,

    Cyclic diaryl ethers in a Late Permian sediment

    , ORGANIC GEOCHEMISTRY, Vol: 30, Pages: 267-273, ISSN: 0146-6380
  • Journal article
    Sephton MA, Pillinger CT, Gilmour I, 1998,

    δ<SUP>13</SUP>C of free and macromolecular aromatic structures in the Murchison meteorite

    , GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 62, Pages: 1821-1828, ISSN: 0016-7037

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