Zobrazeno 1 - 10
of 191
pro vyhledávání: '"David A Fike"'
Autor:
Guang-Sin Lu, Douglas E LaRowe, David A Fike, Gregory K Druschel, William P Gilhooly, Roy E Price, Jan P Amend
Publikováno v:
PLoS ONE, Vol 15, Iss 6, p e0234175 (2020)
Shallow-sea hydrothermal systems, like their deep-sea and terrestrial counterparts, can serve as relatively accessible portals into the microbial ecology of subsurface environments. In this study, we determined the chemical composition of 47 sediment
Externí odkaz:
https://doaj.org/article/cf3b2e9dea0a4868a5678f4f1a2e2fbd
Autor:
Kärt Paiste, David A. Fike, Karen Bakakas Mayika, Mathieu Moussavou, Aivo Lepland, Anthony R. Prave, Tomohiko Sato, Yuichiro Ueno, Yusuke Sawaki, Jocelyn A. Richardson, Robert S. Wood, Clive Jones, Samuel M. Webb, Kalle Kirsimäe
Publikováno v:
Communications Earth & Environment, Vol 5, Iss 1, Pp 1-14 (2024)
Abstract Bulk-rock sulfur isotope data from pyrite in the ~2.1 billion-year sedimentary rocks of the Francevillian Basin, Gabon, have underpinned ideas about initial oxygenation of Earth’s surface environments and eukaryote evolution. Here, we show
Externí odkaz:
https://doaj.org/article/bbfb7ade15a842c1bc3cbe85564405b6
Autor:
Maya L. Gomes, Leigh Anne Riedman, Shane O’Reilly, Usha Lingappa, Kyle Metcalfe, David A. Fike, John P. Grotzinger, Woodward W. Fischer, Andrew H. Knoll
Publikováno v:
Frontiers in Earth Science, Vol 8 (2020)
Microbial mats are taxonomically and metabolically diverse microbial ecosystems, with a characteristic layering that reflects vertical gradients in light and oxygen availability. Silicified microbial mats in Proterozoic carbonate successions are gene
Externí odkaz:
https://doaj.org/article/4fb961fc0d27464fa82c345232dc9b20
Publikováno v:
Frontiers in Microbiology, Vol 11 (2020)
The use of stable isotopes to trace biogeochemical sulfur cycling relies on an understanding of how isotopic fractionation is imposed by metabolic networks. We investigated the effects of the first two enzymatic steps in the dissimilatory sulfate red
Externí odkaz:
https://doaj.org/article/e578d8c4190f44a794a7dce923063a0f
Publikováno v:
Canadian Journal of Earth Sciences. 59:504-520
The Steptoean Positive Isotopic Carbon Excursion, or SPICE event, was a globally recorded +2‰ to +6‰ shift in δ13C values during the later Cambrian (ca. 500 Ma). The excursion is associated with regional sea level change and trilobite extinction
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a283253e038dd5a4fc1ea4259615d30d
https://doi.org/10.1139/cjes-2021-0108
https://doi.org/10.1139/cjes-2021-0108
Autor:
Electra Kotopoulou, Athanasios Godelitsas, Jörg Göttlicher, Ralph Steininger, Roy Price, David A. Fike, Jan P. Amend, William P. Gilhooly, Gregory Druschell, Paraskevi Nomikou, Platon N. Gamaletsos, Stylianos Lozios
Publikováno v:
ACS Earth and Space Chemistry. 6:920-931
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::79ae78ff8f36f372452c168d2835ad95
https://doi.org/10.1021/acsearthspacechem.1c00305
https://doi.org/10.1021/acsearthspacechem.1c00305
Publikováno v:
Geochimica et Cosmochimica Acta. 309:135-150
The Sun’s astrophysical birth environment affected the formation and composition of the Solar System. Primitive meteorites display mass-independent oxygen isotope anomalies that were likely caused by ultraviolet (UV) photochemistry of CO gas-phase
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b96976feaa74ca7f140d08cc81a7f638
https://doi.org/10.1016/j.gca.2021.06.026
https://doi.org/10.1016/j.gca.2021.06.026
Autor:
Judith M. Klatt, Nathan D. Sheldon, Lauren E Kinsman-Costello, Sharon L. Grim, M. L. Gomes, Kathryn Rico, Gregory J. Dick, Wiebke Ziebis, David A. Fike, Matthew Medina
Publikováno v:
GEOBIOLOGY
The sedimentary pyrite sulfur isotope (delta S-34) record is an archive of ancient microbial sulfur cycling and environmental conditions. Interpretations of pyrite delta S-34 signatures in sediments deposited in microbial mat ecosystems are based on
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fd2189e674ae43178f891ad9bda120b0
https://doi.org/10.1111/gbi.12466
https://doi.org/10.1111/gbi.12466
Autor:
Randall J. Griffiths, Gregory J. Soukup, Wei-Ju Chen, Lei-Shih Chen, Heather Barton-Weston, David S. Fike
Publikováno v:
Journal of American College Health. 71:1213-1219
OBJECTIVE The present study aims to examine the impacts of a mandatory physical activity (PA) course on exercise motivation among predominately Hispanic college students. The course was designed based on the Self-Determination Theory to increase stud
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a49e718c1581142dd4ffb0377922da95
https://doi.org/10.1080/07448481.2021.1926259
https://doi.org/10.1080/07448481.2021.1926259
Publikováno v:
GSA Bulletin. 134:261-274
The oxygen isotopic compositions (δ18O) of minimally altered phosphate minerals and fossils, such as conodont elements, are used as a proxy for past ocean temperature. Phosphate is thermally stable under low to moderate burial conditions and is idea
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e80f10573c445fb3082fa3c9c96998f6
https://doi.org/10.1130/b35891.1
https://doi.org/10.1130/b35891.1