Zobrazeno 1 - 10
of 208
pro vyhledávání: '"John K, Volkman"'
Publikováno v:
Energy Geoscience, Vol 5, Iss 2, Pp 100264- (2024)
This study conducted a comparative analysis of extractable hopanoid hydrocarbons and those released via stepwise pyrolysis of typical Eocene immature oil shales in China, namely the Huadian, Maoming, and Fushun shales. Both the Huadian and Maoming sh
Externí odkaz:
https://doaj.org/article/985fafafd52644f59d01811ea3f88828
Publikováno v:
Shiyou shiyan dizhi, Vol 45, Iss 5, Pp 963-972 (2023)
As one of the major fractions of petroleum and/or source rock extracts, asphaltene is commonly characte-rized by complicate molecular structures as well as relatively higher molecular weight (MW). The asphaltene occluded biomarkers have been well int
Externí odkaz:
https://doaj.org/article/edd0a79a1faf432189ca6223a9ec72e1
Autor:
Wenxu Zhou, Xu Zhang, Aoqi Wang, Lin Yang, Qinhua Gan, Liang Yi, Roger E. Summons, John K. Volkman, Yandu Lu
Publikováno v:
Journal of the American Chemical Society. 144:9023-9032
The 4-methyl steranes serve as molecular fossils and are used for studying both eukaryotic evolution and geological history. The occurrence of 4α-methyl steranes in sediments has long been considered evidence of products of partial demethylation med
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f27b88a08fc7279c87b542bcf3fce504
https://doi.org/10.1021/jacs.2c01401
https://doi.org/10.1021/jacs.2c01401
Autor:
John K. Volkman
Publikováno v:
Elements. 18:115-120
Organic geochemistry continues to make important contributions to our understanding of how the biogeochemistry of our planet and its environment has changed over time and of the role of human impacts today. This article provides a brief overview of t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a29e3b98f1151a1331bbb8f4cae34f5d
https://doi.org/10.2138/gselements.18.2.115
https://doi.org/10.2138/gselements.18.2.115
Autor:
John K. Volkman
Publikováno v:
Papers and Proceedings of the Royal Society of Tasmania. :1-4
In 2018, The Royal Society of Tasmania commenced its celebration of 175 years of service to the people of Tasmania. As the culmination of these celebrations a special plaque was unveiled at the Argyle Street entrance to the Tasmanian Museum and Art G
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::66faa80418bf0d1f893ab02e30344c86
https://doi.org/10.26749/rstpp.153.1
https://doi.org/10.26749/rstpp.153.1
Algal origin of sponge sterane biomarkers negates the oldest evidence for animals in the rock record
Autor:
Ilya, Bobrovskiy, Janet M, Hope, Benjamin J, Nettersheim, John K, Volkman, Christian, Hallmann, Jochen J, Brocks
Publikováno v:
Nature ecologyevolution. 5(2)
The earliest fossils of animal-like organisms occur in Ediacaran rocks that are approximately 571 million years old. Yet 24-isopropylcholestanes and other C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=pmid________::54316850f6ad93ad2091681aa19a291c
https://pubmed.ncbi.nlm.nih.gov/33230256
https://pubmed.ncbi.nlm.nih.gov/33230256
Autor:
John K. Volkman, Simon N. Ingram, Diane Claridge, Steven J. Rowland, Christopher H. Vane, Charlotte Dunn, Paul A. Sutton, Barbara von der Lühe
Publikováno v:
Natural product research. 35(22)
For nearly 200 years, the only natural source of the alcohol ambrein has been coproliths produced in about 1% of sperm whales and in related jetsam. However, the finding of ambrein in adipocere/faeces of human corpses, led us to hypothesise that ambr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f27a67b9b98e19d2e118f3d4db65fb62
https://pubmed.ncbi.nlm.nih.gov/32178531
https://pubmed.ncbi.nlm.nih.gov/32178531
Autor:
John K. Volkman
Publikováno v:
Hydrocarbons, Oils and Lipids: Diversity, Origin, Chemistry and Fate ISBN: 9783319545295
Hydrocarbons, Oils and Lipids: Diversity, Origin, Chemistry and Fate
Hydrocarbons, Oils and Lipids: Diversity, Origin, Chemistry and Fate
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49b11f36b84c415b0bd0cbd725e3dbd1
https://doi.org/10.1007/978-3-319-90569-3_10
https://doi.org/10.1007/978-3-319-90569-3_10
Autor:
Guy C J Abell, Stan S Robert, Dion M F Frampton, John K Volkman, Farhan Rizwi, József Csontos, Levente Bodrossy
Publikováno v:
PLoS ONE, Vol 7, Iss 12, p e51542 (2012)
Advances in microbial ecology research are more often than not limited by the capabilities of available methodologies. Aerobic autotrophic nitrification is one of the most important and well studied microbiological processes in terrestrial and aquati
Externí odkaz:
https://doaj.org/article/000aacd46c8648cebe309d2282fc9118
Publikováno v:
Organic Geochemistry. 112:119-126
Eocene Maoming oil shale was extracted and the precipitated asphaltene was subjected to stepwise pyrolysis carried out in seven temperature steps from 310 °C to 610 °C at 50 °C intervals. The pyrolyzate at 310 °C included n -alkanes and botryococ
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a0ad588c384daa82413699b652893f91
https://doi.org/10.1016/j.orggeochem.2017.07.007
https://doi.org/10.1016/j.orggeochem.2017.07.007