Zobrazeno 1 - 10
of 22
pro vyhledávání: '"R E, Summons"'
Autor:
T. Brunoir, C. Mulligan, A. Sistiaga, K. M. Vuu, P. M. Shih, S. S. O’Reilly, R. E. Summons, D. A. Gold
Publikováno v:
Nature Communications, Vol 14, Iss 1, Pp 1-8 (2023)
Abstract Steranes preserved in sedimentary rocks serve as molecular fossils, which are thought to record the expansion of eukaryote life through the Neoproterozoic Era ( ~ 1000-541 Ma). Scientists hypothesize that ancient C27 steranes originated from
Externí odkaz:
https://doaj.org/article/f5853fd4a2de44aa9cb4dcfc7864f364
Autor:
M. Millan, A. J. Williams, A. C. McAdam, J. L. Eigenbrode, A. Steele, C. Freissinet, D. P. Glavin, C. Szopa, A. Buch, R. E. Summons, J. M. T. Lewis, G. M. Wong, C. H. House, B. Sutter, O. McIntosh, A. B. Bryk, H. B. Franz, C. Pozarycki, J. C. Stern, R. Navarro‐Gonzalez, D. P. Archer, V. Fox, K. Bennett, S. Teinturier, C. Malespin, S. S. Johnson, P. R. Mahaffy
Publikováno v:
Journal of Geophysical Research: Planets. 127
Autor:
B. Srain, S. Pantoja, J. Sepúlveda, C. B. Lange, P. Muñoz, R. E. Summons, J. McKay, M. Salamanca
Publikováno v:
Biogeosciences, Vol 12, Iss 20, Pp 6045-6058 (2015)
We reconstructed oxygenation changes in the upwelling ecosystem off Concepción (36° S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigenic enrichments of Mo, U and
Externí odkaz:
https://doaj.org/article/9cafa3e5a24e475e926596fff405e953
Publikováno v:
Geological Society of America Abstracts with Programs.
Autor:
B. Srain, S. Pantoja, J. Sepúlveda, C. B. Lange, P. Muñoz, R. E. Summons, J. McKay, M. Salamanca
We reconstructed oxygenation changes in the Oxygen Minimum Zone of the upwelling ecosystem off Concepción (36° S), Chile, using inorganic and organic proxies in a sediment core covering the last ca. 110 years of sedimentation in this area. Authigen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b77506b29fc6a7a98d1b37be4255ea1d
https://doi.org/10.5194/bgd-12-6003-2015
https://doi.org/10.5194/bgd-12-6003-2015
Publikováno v:
Geobiology. 10(4)
Cyanobacteria are key players in the global carbon and nitrogen cycles and are thought to have been responsible for the initial rise of atmospheric oxygen during the Neoarchean. There is evidence that a class of membrane lipids known as hopanoids ser
Publikováno v:
Geobiology. 10(2)
Hopanes preserved in both modern and ancient sediments are recognized as the molecular fossils of bacteriohopanepolyols, pentacyclic hopanoid lipids. Based on the phylogenetic distribution of hopanoid production by extant bacteria, hopanes have been
Publikováno v:
Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life. 28(4-6)
Biomarkers in geological samples are products derived from biochemical (natural product) precursors by reductive and oxidative processes (e.g., cholestanes from cholesterol). Generally, lipids, pigments and biomembranes are preserved best over longer
Autor:
R E, Summons, L L, Jahnke
Publikováno v:
Ciba Foundation symposium. 202
This paper forms part of our long-term goal of using molecular structure and carbon isotopic signals preserved as hydrocarbons in ancient sediments to improve understanding of the early evolution of Earth's surface environment. We are particularly co