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| 1 | 烟草叶中异构和反异构烷烃的成因及其光合作用C同位素分馏效应显示文摘烟草叶是目前惟一可以通过生物合成得到大量异构和反异构烷烃的植物,然而许多文献对化合物中甲基碳位和奇偶碳数的变化成因未提及。对其成因进行了文献追踪,并对温室不同生长条件(温度、CO2和光照)下培育的烟草叶中的长链正构烷烃、异构和反异构烷烃的单体稳定C同位素组成进行了分析,以期对烟草叶中特殊脂类化合物的生物化学合成同位素分馏效应进行探索研究。与正构烷烃和异构烷烃相比,反异构烷烃的δ13C值平均相对偏重2‰,证明反异构烷烃确实具有不同的合成前身物(2-甲基丁酰辅酶A)。比起甲基基团,脱羧反应很可能使得乙酰辅酶A的羧基基团δ13C值偏轻。本研究中异构烷烃和正构烷烃δ13C值的相似性,说明乙酰辅酶A和前身物2-甲基丙酰辅酶A(C4-CoA)之间的C同位素组成很可能是相似的。用水量越多,烟草叶中异构、反异构烷烃和正构烷烃稳定C同位素组成越偏轻。与强光条件比,弱光条件下培育的烟草叶中正构烷烃的稳定C同位素组成偏轻约2.2‰,异构和反异构烷烃稳定C同位素组成也分别偏轻1.8‰和1.9‰。温度对烟草叶正构烷烃、异构烷烃和反异构烷烃的稳定C同位素组成影响甚小,与Farquhar(1980)有关植物体C同位素组成的报道相吻合。 | 何琴 刘菊 徐忠辉 Kliti Grice 卢鸿 | 2009 | 地球化学2009，38，3： | 5 |
| 2 | An examination by GC×GC-TOFMS of organic molecules present inhighly degraded oils emerging from Caribbean terrestrial seeps of Cretaceous age显示文摘For our ancestors, oil seeps were both a fascination and a resource but as the planet's reserves of high quality low density oil becomes increasingly depleted, so there is now a renewed interest in heavier,biodegraded oils such as those encountered in terrestrial seeps. One such seep is Pitch Lake in the Caribbean island of Trinidad, which is the largest natural deposit of asphalt in the world. At the northern end of the Caribbean, oil emerges along a tectonic contact on the island on Cuba. The sources of the oils from these seeps are relatively recent and both are subject to intense weathering due to the tropical conditions. When analysed by gas chromatography(GC) both oils appear as unresolved complex mixtures(UCM) and show a very high degree of biodegradation thus presenting an analytical challenge. In this case study, these two Caribbean seep oils were analysed by comprehensive two dimensional GC with time of flight mass spectrometry(GC×GC-TOFMS) to expose many thousands of the individual compounds that comprise the UCM. The high chromatographic resolution of the GC×GC-TOFMS produced good quality mass spectra allowing many compounds including molecular fossil ‘biomarkers' to be identified. Compound classes included diamondoid hydrocarbons, demethylated hopanes and secohopanes, mono-and tri-aromatic steroids. D-ring aromatised structures of the 8,14-seco-hopanes,including demethylated forms were present in both oils but further demethylation, probably at position C-25 during biodegradation, was only observed in the Pitch Lake oil. Many polycyclic aromatic hydrocarbons(PAHs) were absent although the fungal-derived pentacyclic PAH perylene was present in both oils. The presence of the angiosperm biomarker lupane in the Pitch Lake oil constrained the age to the Late Cretaceous. The higher degree of biodegradation observed in the Cuban oil was likely due to relatively slow anaerobic processes whereas oil within Pitch Lake was probably subject to additional more rapid aerobic metabolism within the lake. | Alan G.Scarlett Ana Ibis Despaigne-Diaz Simon A.Wilde Kliti Grice | 2019 | Geoscience Frontiers2019，10，1： | 5 |
| 3 | 晋县凹陷未熟蒸发岩沉积物中C22-C27甾烯和C24-C30四环萜烷的检出显示文摘晋县凹陷赵芯2井(2459m,E2k)低熟蒸发岩样品中检出了异常分布的C22-C27甾烯和C24-C30四环萜烷(17,21-断藿烷),但在同井更深、成熟度相对更高的沉积物中并未检出。实测镜质组反射率Ro=0.43%以及芳烃馏分中有高丰度的苯并噻吩和多烷基化的二苯并噻吩,说明热催化作用成因是不可能的,微生物参与成为最可能的生成途经。沉积抽提物未显示出常规生物降解的痕迹,因此这些化合物很可能是在早期成岩阶段特定微生物作用的结果。该区油样中检出的C21-C29甾烷的特征与同时检出的C22-C27甾烯特征一致,进一步表明微生物作用的可能性;高丰度的C24-C30四环萜烷(17,21-断藿烷)和常规藿烷、甲基藿烷相匹配,以及高丰度的C22-C27甾烯和规则甾烷缺失相匹配,特别是芳烃馏分中多取代二苯并噻吩类有机含硫化合物的检出,均表明异常分布的C22-C27甾烯与C24-C30四环萜烷类似,很可能是早期成岩阶段微生物改造作用下的产物。 | 陈腾水 徐忠辉 刘菊 卢鸿 盛国英 彭平安 Kliti Grice Paul Greenwood | 2009 | 地球化学2009，38，3： | 4 |
| 4 | Molecular and Isotopic Characteristics of Mature Condensates from the East China Sea Shelf Basin Using GC×GC-TOFMS and GC-IRMS显示文摘In this study, biomarkers, together with stable carbon(δ13 C) and hydrogen(δD) isotopic compositions of n-alkanes have been examined in a suite of condensates collected from the East China Sea Shelf Basin(ECSSB) in order to delineate their source organic matter input, depositional conditions and evaluate their thermal maturity. Previously, GC-MS analyses have shown that all the condensates are formed in oxidizing environment with terrestrial plants as their main source input. No significant differences were apparent for biomarker parameters, likely due to the low biomarker content and high maturity of these condensates. Conventional GC-MS analysis however, may provides limited information on the sources and thermal maturity of complex mixtures due to insufficient component resolution. In the current study, we used comprehensive two-dimensional gas chromatography with time-of-flight mass spectrometry(GC×GC-TOFMS) to increase the chromatographic resolution. Compounds such as alkyl cyclohexanes, alkyl cyclopentanes and diamondoids, which can be difficult to identify using conventional GC-MS analysis, were successfully identified using GC×GC-TOFMS. From our analyses we propose two possibly unreported indicators, including one maturity indicator(C5--cyclohexane/C5+-cyclohexane) and one oxidation-reduction environment indicator(alkyl-cyclohexane/alkyl-cyclopentane). Multiple petroleum charging events were proposed as an explanation for the maturity indicators indexes discrepancy between methyl-phenanthrene index(MPI) and methyl-adamantane index(MDI). In addition, the stable isotopic results show that condensates from the Paleogene have significantly higher positive δ13 C values of individual n-alkanes than the Neogene samples. Based on δD values, the samples can be divided into two groups, the differences between which are likely to be attributed to different biosynthetic precursors. Variation within each group can likely be attributed to vaporization. | Chao Shan Jiaren Ye Alan Scarlett Kliti Grice | 2019 | Journal of Earth Science2019，30，2： | 2 |
| 5 | ' Binding, bending and bonding': polypurine tract-primed initiation of plusstrand DNA synthesis in human immunodeficiency virus 显示文摘 | Rausch JW Le Grice SF | 2004 | Int J Biochem Cell Biol2004，36，： | 1 |
| 6 | The Limitations of Bankruptcy Prediction Models: Some Cautions for the Researcher显示文摘 | John Stephen Grice Michael T. Dugan | 2001 | Review of Quantitative Finance and Accounting2001，，2： | 1 |
| 7 | Calculation of heats of sublimation and solid phase heats of formation 显示文摘 | Politzer P Murray J S Edward Grice M | 1997 | Molecular Physics1997，91，5： | 1 |
| 8 | Application of traceelement and stable isotope signatures to detemiine the provenance oftea {Camellia sinensis) samples显示文摘 | PILGRIM T S WATLING R J GRICE K | 2010 | Food Chemistry2010，118，4： | 1 |
| 9 | Utterer's Meaning and Intentions 显示文摘 | PAUL GRICE | 1968 | Philosophical Review1968，78，2： | 1 |
| 10 | Heats of formation , structures and relative stabilities of some tetraazapentalene-related molecules显示文摘 | Grice E Politzer P | 1995 | Journal of Molecular Structure(Theochem)1995，358，13： | 1 |
| 11 | Safety evaluation of butylated hydroxyanisole from the perspective of effects on forestomach and oesophageal squamous epithelium 显示文摘 | GRICE H C | 1988 | Food and Chemical Toxicology1988，26，8： | 1 |
| 12 | Evaluating the biological relevance of putative enhancers using Tol2 trans-poson-mediated transgenesis in zebrafish 显示文摘 | Fisher S Grice E A Vinton R M | 2006 | Nat Protoc2006，1，3： | 1 |
| 13 | The skin microbiome显示文摘 | Grice EA Segre JA | 2011 | Nat Rev Micro- biol2011，9，4： | 1 |
| 14 | Topographical and temporal diversity of the human skin microbiome 显示文摘 | Grice EA Kong HH Conlan S | 2009 | Science2009，324，5931： | 1 |
| 15 | A method for the vibration analysis of built-up structures,Part Ⅰ:Introduction and analytical analysis of the plate-stiffened beam显示文摘 | Grice R M Pinnington R J | 2000 | Journal of Sound and Vibration2000，230，4： | 1 |
| 16 | The effect of source and maturity on the stable isotopic compositions of individual hydrocarbons in sediments and crude oils from the Vulcan Sub-basin, Timor Sea, Northern Australia 显示文摘 | Dawson D Grice K Alexander R | 2007 | Organic Geochemistry2007，38，7： | 1 |
| 17 | Photic zone euxinia during the Permian-Triassic superanoxic event显示文摘 | Grice K Cao Cangqun Love G D | 2005 | Science2005，307，5710： | 1 |
| 18 | The skinmicrobiome显示文摘 | GRICE E A SEGRE JA | 2011 | Nat Rev Microbiol2011，9，4： | 1 |
| 19 | Familial cor- ticosteroid binding globulin deficiency due to a novel null mutation: as association with fatigue and relative hypoten- sion 显示文摘 | Torpy DJ Bachmann AW Grice JE | 2001 | J Clin Endominol Metab2001，86，8： | 1 |
| 20 | Linkage disequilibrium between an allele at the dopamine D4 receptor locus and Tourette syndrome,by the transmission-disequilibrium test显示文摘 | Grice DE Leckman JF Pauls DL | 1996 | Am J Hum Genet1996，59，： | 1 |
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