Search Results - "SUMMONS, Roger E"

Bacterial Vesicles in Marine Ecosystems by Biller, Steven J., Schubotz, Florence, Roggensack, Sara E., Thompson, Anne W., Summons, Roger E., Chisholm, Sallie W.

“…Many heterotrophic bacteria are known to release extracellular vesicles, facilitating interactions between cells and their environment from a distance. Vesicle…”
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Organic Matter Preserved in 3-Billion-Year-Old Mudstones at Gale Crater, Mars by Eigenbrode, Jennifer L., Summons, Roger E., Archer, Paul D., Jr, Mahaffy, Paul R., Conrad, Pamela G., Hurowitz, Joel A., Grotzinger, John P., Gupta, Sanjeev, Ming, Doug W., Sumner, Dawn Y., Szopa, Cyril, Malespin, Charles, Steele, Andrew, Buch, Arnaud, Coll, Patrice, Freissinet, Caroline, Millan, Maeva, Navarro-González, Rafael, Sutter, Brad, McAdam, Amy C., Franz, Heather, Glavin, Daniel P.

“…Establishing the presence and state of organic matter, including its possible biosignatures, in martian materials has been an elusive quest, despite limited…”
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Sterol and genomic analyses validate the sponge biomarker hypothesis by Gold, David A., Grabenstatter, Jonathan, de Mendoza, Alex, Riesgo, Ana, Ruiz-Trillo, Iñaki, Summons, Roger E.

“…Molecular fossils (or biomarkers) are key to unraveling the deep history of eukaryotes, especially in the absence of traditional fossils. In this regard, the…”
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Discovery, taxonomic distribution, and phenotypic characterization of a gene required for 3-methylhopanoid production by Welander, Paula V, Summons, Roger E

“…Hopanoids methylated at the C-3 position are a subset of bacterial triterpenoids that are readily preserved in modern and ancient sediments and in petroleum…”
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Reconciling discrepant minor sulfur isotope records of the Great Oxidation Event by Uveges, Benjamin T., Izon, Gareth, Ono, Shuhei, Beukes, Nicolas J., Summons, Roger E.

“…Understanding the timing and trajectory of atmospheric oxygenation remains fundamental to deciphering its causes and consequences. Given its origin in…”
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Reappraisal of hydrocarbon biomarkers in Archean rocks by French, Katherine L., Hallmann, Christian, Hope, Janet M., Schoon, Petra L., Zumberge, J. Alex, Hoshino, Yosuke, Peters, Carl A., George, Simon C., Love, Gordon D., Brocks, Jochen J., Buick, Roger, Summons, Roger E.

“…Significance The advent of oxygenic photosynthesis set the stage for the evolution of complex life on an oxygenated planet, but it is unknown when this…”
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Rapid oxygenation of Earth's atmosphere 2.33 billion years ago by Luo, Genming, Ono, Shuhei, Beukes, Nicolas J, Wang, David T, Xie, Shucheng, Summons, Roger E

“…Molecular oxygen (O2) is, and has been, a primary driver of biological evolution and shapes the contemporary landscape of Earth's biogeochemical cycles…”
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Comparative microbial diversity and redox environments of black shale and stromatolite facies in the Mesoproterozoic Xiamaling Formation by Luo, Genming, Hallmann, Christian, Xie, Shucheng, Ruan, Xiaoyan, Summons, Roger E.

“…The composition of microbial communities and their relationship to ocean redox structure in the Precambrian are topics of continuing interest in geobiology…”
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Bulk and grain-scale minor sulfur isotope data reveal complexities in the dynamics of Earth's oxygenation by Izon, Gareth, Luo, Genming, Uveges, Benjamin T, Beukes, Nicolas, Kitajima, Kouki, Ono, Shuhei, Valley, John W, Ma, Xingyu, Summons, Roger E

“…SignificanceThe permanent disappearance of mass-independent sulfur isotope fractionation (S-MIF) from the sedimentary record has become a widely accepted proxy…”
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Planktonic Euryarchaeota are a significant source of archaeal tetraether lipids in the ocean by Lincoln, Sara A., Wai, Brenner, Eppley, John M., Church, Matthew J., Summons, Roger E., DeLong, Edward F.

“…Archaea are ubiquitous in marine plankton, and fossil forms of archaeal tetraether membrane lipids in sedimentary rocks document their participation in marine…”
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Carotenoid biomarkers in Namibian shelf sediments: Anoxygenic photosynthesis during sulfide eruptions in the Benguela Upwelling System by Ma, Jian, French, Katherine L., Cui, Xingqian, Bryant, Donald A., Summons, Roger E.

“…Aromatic carotenoid-derived hydrocarbon biomarkers are ubiquitous in ancient sediments and oils and are typically attributed to anoxygenic phototrophic green…”
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Methanogenic burst in the end-Permian carbon cycle by Rothman, Daniel H., Fournier, Gregory P., French, Katherine L., Alm, Eric J., Boyle, Edward A., Cao, Changqun, Summons, Roger E.

“…The end-Permian extinction is associated with a mysterious disruption to Earth’s carbon cycle. Here we identify causal mechanisms via three observations…”
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Nitrogen fixation sustained productivity in the wake of the Palaeoproterozoic Great Oxygenation Event by Luo, Genming, Junium, Christopher K., Izon, Gareth, Ono, Shuhei, Beukes, Nicolas J., Algeo, Thomas J., Cui, Ying, Xie, Shucheng, Summons, Roger E.

“…The marine nitrogen cycle is dominated by redox-controlled biogeochemical processes and, therefore, is likely to have been revolutionised in response to…”
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Fossil steroids record the appearance of Demospongiae during the Cryogenian period by Love, Gordon D., Grosjean, Emmanuelle, Stalvies, Charlotte, Fike, David A., Grotzinger, John P., Bradley, Alexander S., Kelly, Amy E., Bhatia, Maya, Meredith, William, Snape, Colin E., Bowring, Samuel A., Condon, Daniel J., Summons, Roger E.

“…The earliest metazoans Chemical fossils discovered in sedimentary rocks in Oman provide the earliest evidence for animal life so far discovered. The fossil…”
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Biomarker stratigraphy in the Athel Trough of the South Oman Salt Basin at the Ediacaran‐Cambrian Boundary by Roussel, Anaïs, Cui, Xingqian, Summons, Roger E.

“…The South Oman Salt Basin (SOSB) has been studied extensively for knowledge concerning the habitat of the enigmatic Ediacaran–Cambrian oils that are produced…”
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Microaerobic steroid biosynthesis and the molecular fossil record of Archean life by Waldbauer, Jacob R., Newman, Dianne K., Summons, Roger E.

“…The power of molecular oxygen to drive many crucial biogeochemical processes, from cellular respiration to rock weathering, makes reconstructing the history of…”
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Extending the known range of glycerol ether lipids in the environment: structural assignments based on tandem mass spectral fragmentation patterns by Liu, Xiao-Lei, Summons, Roger E., Hinrichs, Kai-Uwe

“…RATIONALE Glycerol‐based alkyl ether lipids are ubiquitous components in marine sediments. In order to explore their structural diversity and biological…”
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Multiple origins of methane at the Lost City Hydrothermal Field by Bradley, Alexander S., Summons, Roger E.

“…The high concentrations of methane in the vent fluids of the Lost City Hydrothermal Field represent the sum of abiotic and biological sources and sinks. Stable…”
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Biosynthesis of 2-methylbacteriohopanepolyols by an anoxygenic phototroph by Rashby, Sky E, Sessions, Alex L, Summons, Roger E, Newman, Dianne K

“…Sedimentary 2-methyhopanes have been used as biomarker proxies for cyanobacteria, the only known bacterial clade capable of oxygenic photosynthesis and the…”
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Centennial scale sequences of environmental deterioration preceded the end-Permian mass extinction by Saito, Ryosuke, Wörmer, Lars, Taubner, Heidi, Kaiho, Kunio, Takahashi, Satoshi, Tian, Li, Ikeda, Masayuki, Summons, Roger E., Hinrichs, Kai-Uwe

“…The exact drivers for the end-Permian mass extinction (EPME) remain controversial. Here we focus on a ~10,000 yr record from the marine type section at…”
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