Results 31 to 40 of about 20,788 (267)

Predictive isotope model connects microbes in culture and nature [PDF]

, 2014
In PNAS, Wing and Halevy (1) present a new model that quantitatively describes the magnitude of sulfur isotope fractionation produced by dissimilatory microbial sulfate reduction (MSR).
Bosak, Tanja, Ono, Shuhei, Sim, Min Sub
core   +1 more source

The Biogeochemical Sulfur Cycle of Marine Sediments

Frontiers in Microbiology, 2019
Microbial dissimilatory sulfate reduction to sulfide is a predominant terminal pathway of organic matter mineralization in the anoxic seabed. Chemical or microbial oxidation of the produced sulfide establishes a complex network of pathways in the sulfur ...
Bo Barker Jørgensen, Alyssa J. Findlay, André Pellerin   +2 more
doaj   +1 more source

The Phosphorus/Sulfur Abundance Ratio as a Test of Galactic Cosmic-Ray Source Models [PDF]

, 2001
Galactic cosmic-ray (GCR) elemental abundances display a fractionation compared to solar-system values that appears ordered by atomic properties such as the first ionization potential (FIP) or condensation temperature (volatility).
Binns, W. R., Christian, E. R., Cummings, A. C., George, J. S., Hink, P. L., Leske, R. A., Mewaldt, R. A., Stone, E. C., von Rosenvinge, T. T., Wiedenbeck, M. E., Yanasak, N. E.   +10 more
core   +1 more source

Sulfur degassing at Erta Ale (Ethiopia) and Masaya (Nicaragua) volcanoes: Implications for degassing processes and oxygen fugacities of basaltic systems

Geochemistry, Geophysics, Geosystems, 2013
We investigate the relationship between sulfur and oxygen fugacity at Erta Ale and Masaya volcanoes. Oxygen fugacity was assessed utilizing Fe3+/∑Fe and major element compositions measured in olivine‐hosted melt inclusions and matrix glasses.
J. M. deMoor, T. P. Fischer, Z. D. Sharp, P. L. King, M. Wilke, R. E. Botcharnikov, E. Cottrell, M. Zelenski, B. Marty, K. Klimm, C. Rivard, D. Ayalew, C. Ramirez, K. A. Kelley   +13 more
doaj   +1 more source

Deconstructing the Dissimilatory Sulfate Reduction Pathway: Isotope Fractionation of a Mutant Unable of Growth on Sulfate

Frontiers in Microbiology, 2018
The sulfur isotope record provides key insight into the history of Earth's redox conditions. A detailed understanding of the metabolisms driving this cycle, and specifically microbial sulfate reduction (MSR), is crucial for accurate paleoenvironmental ...
Emma Bertran, William D. Leavitt, William D. Leavitt, Andre Pellerin, Grant M. Zane, Judy D. Wall, Itay Halevy, Boswell A. Wing, David T. Johnston   +8 more
doaj   +1 more source

Isotopic Fractionation Associated With Sulfate Import and Activation by Desulfovibrio vulgaris str. Hildenborough

Frontiers in Microbiology, 2020
The use of stable isotopes to trace biogeochemical sulfur cycling relies on an understanding of how isotopic fractionation is imposed by metabolic networks.
Derek A. Smith, David A. Fike, David T. Johnston, Alexander S. Bradley, Alexander S. Bradley   +4 more
doaj   +1 more source

Sulfur isotope fractionation during heterogeneous oxidation of SO₂ on mineral dust [PDF]

Atmospheric Chemistry and Physics, 2012
Mineral dust is a major fraction of global atmospheric aerosol, and the oxidation of SO2 on mineral dust has implications for cloud formation, climate and the sulfur cycle.
P. Hoppe, J. N. Crowley, S. Borrmann, S. Foley, B. Sinha, E. Harris   +5 more
doaj   +1 more source

Fractionated sulfur isotopes in sulfides of the Kaidun meteorite [PDF]

Meteoritics & Planetary Science, 1997
Abstract— The Kaidun meteorite contains carbonaceous chondrite (CM1) clasts that have been highly altered by reactions with hydrothermal fluids. Pyrrhotite in these clasts occurs as unusual needles wrapped by sheaths of phyllosilicate, and pentlandite forms veins that crosscut aggregates of phyllosilicate and garnet but not pyrrhotite.
Harry Y. McSWEEN, Lee R. RICIPUTI, Bruce A. PATERSON   +2 more
openaire   +1 more source

Atmospheric sulfur is recycled to the crystalline continental crust during supercontinent formation

Nature Communications, 2018
The long-term evolution of the sulfur budget in the lithosphere is poorly constrained. Here, using mass independent isotope fractionation as an indelible tracer, the authors track the pathway of sulfur from the Earth’s surface to punctuated episodes of ...
Crystal LaFlamme, Marco L. Fiorentini, Mark D. Lindsay, Thi Hao Bui   +3 more
doaj   +1 more source

Theoretical estimates of equilibrium sulfur isotope effects in aqueous sulfur systems : highlighting the role of isomers in the sulfite and sulfoxylate systems [PDF]

, 2016
© The Author(s), 2016. This is the author's version of the work and is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Geochimica et Cosmochimica Acta 195 (2016): 171-200, doi:10.1016/j.gca.
Eldridge, Daniel L., Farquhar, James, Guo, Weifu   +2 more
core   +1 more source