9 research outputs found
The nature and fate of natural resins in the geosphere. Part X.<sup>†</sup>Structural characteristics of the macromolecular constituents of modern Dammar resin and Class II ambers
Get PDF<p/> <p>As part of a larger study of the structure and behavior of polyterpenoids in sedimentary systems, the structural characteristics of the macromolecular constituents of Dammar resin and a related Class II amber have been reinvestigated. The conclusions drawn from these analyses are inconsistent with the current widely held "polycadinene" model for the macromolecular structure of these materials. Double bond characteristics observed by one and two dimensional NMR spectroscopy do not match those in the proposed "polycadinene" structure. Based on these observations it is suggested that the proposed "polycadinene" structure for these materials is inadequate and requires revision. Elemental and NMR data also suggest a significant contribution from functionalized monomers.</p
Response of 17α(H)-diahopanes and 18α(H)-neohopanes to maturity in lacustrine source rocks derived from the Songliao Basin, NE China
No full textDetermination of the distribution and speciation of selenium in an argillaceous sample using chemical extractions and post-extractions analyses: application to the hydrogeological experimental site of Poitiers
No full textBiomarker characteristics of certain crude oils and the oil-source rock correlation for the Kurdistan oilfields, Northern Iraq
No full textCrude oil degradation by bacterial consortia under four different redox and temperature conditions
No full textKhatatba Formation as an active source rock for hydrocarbons in the northeast Abu Gharadig Basin, north Western Desert, Egypt
No full textHydrocarbon habitat in the Zielin Late Permian isolated carbonate platform, western Poland
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