Results 21 to 30 of about 3,020 (234)

Sulfur isotope fractionation during incorporation of sulfur nucleophiles into organic compounds [PDF]

Chemical Communications, 2008
(34)S enrichment is shown to occur during sulfurization reactions and for the first time conclusively attributed to an isotope equilibrium effect rather than selective addition of (34)S enriched nucleophiles.
Amrani, Alon, Ma, Qisheng, Ahmad, Ward Said, Aizenshtat, Zeev, Tang, Yongchung   +4 more
openaire   +3 more sources

Fractionation of sulfur isotopes by Desulfovibrio vulgaris mutants lacking hydrogenases or type I tetraheme cytochrome c3

Frontiers in Microbiology, 2013
The sulfur isotope effect produced by sulfate reducing microbes is commonly used to trace biogeochemical cycles of sulfur and carbon in aquatic and sedimentary environments.
Min Sub eSim, Min Sub eSim, David T Wang, Grant M Zane, Judy D Wall, Tanja eBosak, Shuhei eOno   +6 more
doaj   +1 more source

Sulfur Isotope Effects of Dissimilatory Sulfite Reductase

Frontiers in Microbiology, 2015
The precise interpretation of environmental sulfur isotope records requires a quantitative understanding of the biochemical controls on sulfur isotope fractionation by the principle isotope-fractionating process within the S cycle, microbial sulfate ...
William D. Leavitt, William D. Leavitt, Alexander S. Bradley, Alexander S. Bradley, André A. Santos, Inês A. Cardoso Pereira, David Thomas Johnston   +6 more
doaj   +1 more source

Sulfur Stable Isotope Discrimination in Rice: A Sulfur Isotope Mass Balance Study

Frontiers in Plant Science, 2022
The use of sulfur (S) stable isotopes to study S metabolism in plants is still limited by the relatively small number of studies. It is generally accepted that less S stable isotope discrimination occurs during sulfate (SO42–) uptake.
Viviana Cavallaro, Moez Maghrebi, Moez Maghrebi, Mariachiara Caschetto, Mariachiara Caschetto, Gian Attilio Sacchi, Fabio Francesco Nocito   +6 more
doaj   +1 more source

Fractionation of sulfur isotopes during heterogeneous oxidation of SO₂ on sea salt aerosol: a new tool to investigate non-sea salt sulfate production in the marine boundary layer [PDF]

Atmospheric Chemistry and Physics, 2012
The oxidation of SO2 to sulfate on sea salt aerosols in the marine environment is highly important because of its effect on the size distribution of sulfate and the potential for new particle nucleation from H2SO4 (g). However, models of the sulfur cycle
S. Borrmann, P. Hoppe, S. Foley, B. Sinha, E. Harris   +4 more
doaj   +1 more source

Multiple sulfur isotope signatures of sulfite and thiosulfate reduction by the model dissimilatory sulfate-reducer, Desulfovibrio alaskensis str. G20

Frontiers in Microbiology, 2014
Dissimilatory sulfate reduction serves as a key metabolic carbon remineralization process in anoxic marine environments. Sulfate reducing microorganisms can impart a wide range in mass-dependent sulfur isotopic fractionation.
William D. Leavitt, William D. Leavitt, Renata eCummins, Marian L Schmidt, Min Sub eSim, Min Sub eSim, Shuhei eOno, Alexander S. Bradley, David T. Johnston   +8 more
doaj   +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

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

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

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