Publications
76 results found
Bougeard CMM, Janmohamed IHS, Goslan EH, et al., 2008, Parameters affecting haloacetic acid and trihalomethane concentrations in treated UK drinking waters, Occurrence, Formation, Health Effects, and Control of Disinfection By-Products in Drinking Water, Editors: Karanfil, Krasner, Westerhoff, Xie, Publisher: Oxford University Press, USA, Pages: 95-108, ISBN: 9780841269507
Martins Z, Botta O, Fogel ML, et al., 2008, Extraterrestrial nucleobases in the Murchison meteorite, EARTH PLAN SCI LETT, Vol: 270, Pages: 130-136, ISSN: 0012-821X
Carbon-rich meteorites, carbonaceous chondrites, contain many biologically relevant organic molecules and delivered prebiotic material to the young Earth. We present compound-specific carbon isotope data indicating that measured purine and pyrimidine compounds are indigenous components of the Murchison meteorite. Carbon isotope ratios for uracil and xanthine of δ13C=+44.5‰ and +37.7‰, respectively, indicate a non-terrestrial origin for these compounds. These new results demonstrate that organic compounds, which are components of the genetic code in modern biochemistry, were already present in the early solar system and may have played a key role in life's origin.
Watson JS, Sephton MA, Sephton SV, et al., 2007, Rapid determination of spore chemistry using thermochemolysis gas chromatography-mass spectrometry and micro-Fourier transform infrared spectroscopy, PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, Vol: 6, Pages: 689-694, ISSN: 1474-905X
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- Citations: 45
Cockell CS, Kennerley N, Lindstrom M, et al., 2007, Geomicrobiology of a weathering crust from an impact crater and a hypothesis for its formation, Geomicrobiology Journal: an international journal of geomicrobiology and microbial biogeochemistry, Vol: 24, Pages: 425-440
Understanding the role of microbe-mineral interactions in rock weathering is vital to an understanding of nutrient availability to the biosphere and, in so far as weathering influences carbon dioxide drawdown, climate control. We studied a weathering crust on a resurge tsunami deposit (Loftarstone) from the 455 Ma old Lockne impact crater, central Sweden with an integrated approach using XRD, electron microprobe analysis, SEM-EDS and GCMS analysis of organics. The lichens and fungal hyphae network preferentially weather the chlorite in the Loftarstone compared to feldspars and quartz. We demonstrate, using a fungal isolate (identified by ITS sequencing), that biologically induced dissolution of the calcite component produces cavities which increase the surface area of interaction between the biota and the rock substrate. The weathering crust exfoliates from the rock surface in sheets, which we attribute to the dissolution of the calcite matrix. We present a hypothesis for the crust development. As well as providing insights into weathering on substrates derived from a diversity of high-energy geological disturbances, such as impact events and tsunamis, the weathering crust provides a model system to understand weathering processes in other common lithologies with mixed mineralogies at small spatial scales, including many sedimentary rocks. This work reveals how each different clast plays a unique part in the weathering process, leading to a well-defined weathering sequence.
Westall F, de Vries ST, Nijman W, et al., 2006, The 3.466 Ga Kitty’s Gap Chert, an Early Archean microbial ecosystem, Processes on the early Earth, Editors: Reimold, Gibson, Publisher: Geological Society of Amer, ISBN: 9780813724058
Martins Z, Botta O, Fogel ML, et al., 2006, Isotopic analysis of nucleobases in the Murchison meteorite, METEORIT PLANET SCI
Martins Z, Watson JS, Sephton MA, et al., 2006, Free dicarboxylic and aromatic acids in the carbonaceous chondrites Murchison and Orgueil, Meteoritics & Planetary Science, Vol: 41, Pages: 1073-1080, ISSN: 1086-9379
Sephton MA, Love GD, Meredith W, et al., 2005, Hydropyrolysis: A new technique for the analysis of macromolecular material in meteorites, PLANETARY AND SPACE SCIENCE, Vol: 53, Pages: 1280-1286, ISSN: 0032-0633
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- Citations: 26
Watson JS, Sephton MA, Looy CV, et al., 2005, Oxygen-containing aromatic compounds in a Late Permian sediment, ORGANIC GEOCHEMISTRY, Vol: 36, Pages: 371-384, ISSN: 0146-6380
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- Citations: 26
Sephton MA, Love GD, Watson JS, et al., 2004, Hydropyrolysis of insoluble carbonaceous matter in the Murchison meteorite: New insights into its macromolecular structure, GEOCHIMICA ET COSMOCHIMICA ACTA, Vol: 68, Pages: 1385-1393, ISSN: 0016-7037
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- Citations: 103
Watson JS, Pearson VK, Sephton MA, et al., 2004, Molecular, isotopic and in-situ analytical approaches to the study of meteoritic organic material, International Journal of Astrobiology, Vol: 3, Pages: 107-116, ISSN: 1473-5504
Bridges JC, Schwanethal JP, Pearson VK, et al., 2004, A very public fireball, Astronomy and Geophysics, Vol: 45, Pages: 625-626
Watson JS, Pearson VK, Gilmour I, et al., 2003, Contamination by sesquiterpenoid derivatives in the Orgueil carbonaceous chondrite, ORGANIC GEOCHEMISTRY, Vol: 34, Pages: 37-47, ISSN: 0146-6380
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- Citations: 16
Watson JS, Jones DM, Swannell RPJ, et al., 2002, Formation of carboxylic acids during aerobic biodegradation of crude oil and evidence of microbial oxidation of hopanes, Organic Geochemistry, Vol: 33, Pages: 1153-1169, ISSN: 0146-6380
Jones DM, Watson JS, Meredith W, et 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.
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
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