Search Results - "Samarkin, Vladimir"

The East Siberian Arctic Shelf: towards further assessment of permafrost-related methane fluxes and role of sea ice by Shakhova, Natalia, Semiletov, Igor, Sergienko, Valentin, Lobkovsky, Leopold, Yusupov, Vladimir, Salyuk, Anatoly, Salomatin, Alexander, Chernykh, Denis, Kosmach, Denis, Panteleev, Gleb, Nicolsky, Dmitry, Samarkin, Vladimir, Joye, Samantha, Charkin, Alexander, Dudarev, Oleg, Meluzov, Alexander, Gustafsson, Orjan

“…Sustained release of methane (CH4) to the atmosphere from thawing Arctic permafrost may be a positive and significant feedback to climate warming. Atmospheric…”
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Abiotic Nitrous Oxide Production From Sediments and Brine of Don Juan Pond, Wright Valley Antarctica, at Mars Analog Temperatures (−40°C) by Schutte, Charles A., Samarkin, Vladimir A., Bowles, Marshall W., Peters, Brian, Casciotti, Karen L., Madigan, Michael T., Joye, Samantha B.

“…The presence of biogenic gases such as oxygen, methane, and nitrous oxide (N2O) in the atmospheres of extraterrestrial bodies has been postulated as a…”
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Abiotic nitrous oxide emission from the hypersaline Don Juan Pond in Antarctica by Joye, Samantha B, Samarkin, Vladimir A, Madigan, Michael T, Bowles, Marshall W, Casciotti, Karen L, Priscu, John C, McKay, Christopher P

“…Nitrous oxide is a potent atmospheric greenhouse gas that contributes to ozone destruction. Biological processes such as nitrification and denitrification are…”
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Generation and Utilization of Volatile Fatty Acids and Alcohols in Hydrothermally Altered Sediments in the Guaymas Basin, Gulf of California by Zhuang, Guang‐Chao, Montgomery, Andrew, Samarkin, Vladimir A., Song, Min, Liu, Jiarui, Schubotz, Florence, Teske, Andreas, Hinrichs, Kai‐Uwe, Joye, Samantha B.

“…Volatile fatty acids (VFAs) and alcohols are key intermediates of anaerobic carbon metabolism, yet their biogeochemical cycling remains poorly constrained in…”
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Microbial life at −13 °C in the brine of an ice-sealed Antarctic lake by Murray, Alison E, Kenig, Fabien, Fritsen, Christian H, McKay, Christopher P, Cawley, Kaelin M, Edwards, Ross, Kuhn, Emanuele, McKnight, Diane M, Ostrom, Nathaniel E, Peng, Vivian, Ponce, Adrian, Priscu, John C, Samarkin, Vladimir, Townsend, Ashley T, Wagh, Protima, Young, Seth A, Yung, Pung To, Doran, Peter T

“…The permanent ice cover of Lake Vida (Antarctica) encapsulates an extreme cryogenic brine ecosystem (−13 °C; salinity, 200). This aphotic ecosystem is anoxic…”
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Impact of natural oil and higher hydrocarbons on microbial diversity, distribution, and activity in Gulf of Mexico cold-seep sediments by Orcutt, Beth N., Joye, Samantha B., Kleindienst, Sara, Knittel, Katrin, Ramette, Alban, Reitz, Anja, Samarkin, Vladimir, Treude, Tina, Boetius, Antje

“…Gulf of Mexico cold seeps characterized by variable compositions and magnitudes of hydrocarbon seepage were sampled in order to investigate the effects of…”
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Biogeochemical signatures and microbial activity of different cold-seep habitats along the Gulf of Mexico deep slope by Joye, Samantha B., Bowles, Marshall W., Samarkin, Vladimir A., Hunter, Kimberley S., Niemann, Helge

“…Microorganisms and the processes they mediate serve as the metabolic foundation of cold seeps. We characterized a suite of biogeochemical constituents and…”
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Biogeochemical and 16S rRNA gene sequence evidence supports a novel mode of anaerobic methanotrophy in permanently ice-covered Lake Fryxell, Antarctica by Saxton, Matthew A., Samarkin, Vladimir A., Schutte, Charles A., Bowles, Marshall W., Madigan, Michael T., Cadieux, Sarah B., Pratt, Lisa M., Joye, Samantha B.

“…Lake Fryxell, McMurdo Dry Valleys, Antarctica contains a constantly cold water column and perennial ice-cover. Although carbon and sulfur cycling in this…”
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Weak coupling between sulfate reduction and the anaerobic oxidation of methane in methane-rich seafloor sediments during ex situ incubation by Bowles, Marshall W., Samarkin, Vladimir A., Bowles, Kathy M., Joye, Samantha B.

“…We investigated coupling between sulfate reduction (SR) and anaerobic oxidation of methane (AOM) by quantifying pore water geochemical profiles, determining…”
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Carbon mineralization in Laptev and East Siberian sea shelf and slope sediment by Brüchert, Volker, Bröder, Lisa, Sawicka, Joanna E, Tesi, Tommaso, Joye, Samantha P, Sun, Xiaole, Semiletov, Igor P, Samarkin, Vladimir A

“…The Siberian Arctic Sea shelf and slope is a key region for the degradation of terrestrial organic material transported from the organic-carbon-rich permafrost…”
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New constraints on methane fluxes and rates of anaerobic methane oxidation in a Gulf of Mexico brine pool via in situ mass spectrometry by Wankel, Scott D., Joye, Samantha B., Samarkin, Vladimir A., Shah, Sunita R., Friederich, Gernot, Melas-Kyriazi, John, Girguis, Peter R.

“…Deep-sea biogeochemical cycles are, in general, poorly understood owing to the difficulties of making measurements in situ, recovering samples with minimal…”
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A halophilic bacterium inhabiting the warm, CaCl2-rich brine of the perennially ice-covered Lake Vanda, McMurdo Dry Valleys, Antarctica by Tregoning, George S, Kempher, Megan L, Jung, Deborah O, Samarkin, Vladimir A, Joye, Samantha B, Madigan, Michael T

“…Lake Vanda is a perennially ice-covered and stratified lake in the McMurdo Dry Valleys, Antarctica. The lake develops a distinct chemocline at about a 50-m…”
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Relative importance of methylotrophic methanogenesis in sediments of the Western Mediterranean Sea by Zhuang, Guang-Chao, Heuer, Verena B., Lazar, Cassandre S., Goldhammer, Tobias, Wendt, Jenny, Samarkin, Vladimir A., Elvert, Marcus, Teske, Andreas P., Joye, Samantha B., Hinrichs, Kai-Uwe

“…Microbial production of methane is an important terminal metabolic process during organic matter degradation in marine sediments. It is generally acknowledged…”
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Molecular biogeochemistry of sulfate reduction, methanogenesis and the anaerobic oxidation of methane at Gulf of Mexico cold seeps by Orcutt, Beth, Boetius, Antje, Elvert, Marcus, Samarkin, Vladimir, Joye, Samantha B.

“…The anaerobic oxidation of methane in aquatic environments is a globally significant sink for a potent greenhouse gas. Significant gaps remain in our…”
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Improved measurement of microbial activity in deep‐sea sediments at in situ pressure and methane concentration by Bowles, Marshall W., Samarkin, Vladimir A., Joye, Samantha B.

“…A robust and convenient method was developed to evaluate rates of microbial activity in gas‐charged deepsea sediments at in situ hydrostatic pressure,…”
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Metabolic variability in seafloor brines revealed by carbon and sulphur dynamics by Joye, Samantha B, Orcutt, Beth! N, Lever, Mark A, Samarkin, Vladimir A, MacDonald, Ian R, Hinrichs, Kai-Uwe, Elvert, Marcus, Teske, Andreas P, Lloyd, Karen G, Montoya, Joseph P, Meile, Christof D

“…Brine fluids that upwell from deep, hot reservoirs below the sea bed supply the sea floor with energy-rich substrates and nutrients that are used by diverse…”
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Biogeochemistry of Methane in the Permanently Ice-Covered Lake Untersee, Central Dronning Maud Land, East Antarctica by Wand, Ulrich, Samarkin, Vladimir A., Nitzsche, Horst-Michael, Hubberten, Hans-Wolfgang

“…We found unprecedentedly high abundances of microbially produced CH4in the anoxic deep waters of Lake Untersee, an oligotrophic, perennially ice-covered…”
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Porewater Stoichiometry of Terminal Metabolic Products, Sulfate, and Dissolved Organic Carbon and Nitrogen in Estuarine Intertidal Creek-Bank Sediments by Weston, Nathaniel B., Porubsky, William P., Samarkin, Vladimir A., Erickson, Matthew, Macavoy, Stephen E., Joye, Samantha B.

“…Porewater equilibration samplers were used to obtain porewater inventories of inorganic nutrients (NH₄⁺,$\text{NO}_{x}$, PO₄³⁻), dissolved organic carbon (DOC)…”
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Life at the edge of methane ice: microbial cycling of carbon and sulfur in Gulf of Mexico gas hydrates by Orcutt, Beth N, Boetius, Antje, Lugo, Samantha K, MacDonald, Ian R, Samarkin, Vladimir A, Joye, Samantha B

“…The processes of methane oxidation and sulfate reduction were examined in subsamples of gas hydrate associated materials collected along the Gulf of Mexico…”
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Sulfate reduction and methanogenesis in the hypersaline deep waters and sediments of a perennially ice‐covered lake by Saxton, Matthew A., Samarkin, Vladimir A., Madigan, Michael T., Bowles, Marshall W., Sattley, William Matthew, Schutte, Charles A., Joye, Samantha B.

“…Documenting anaerobic microbial metabolisms in hypersaline perennially ice‐covered lakes in Antarctica further refines the environmental limits to life and may…”
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