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Tetrathionate and Elemental Sulfur Shape the Isotope Composition of Sulfate in Acid Mine Drainage.

Frontiers in microbiology

Balci N, Brunner B, Turchyn AV.
PMID: 28861071
Front Microbiol. 2017 Aug 17;8:1564. doi: 10.3389/fmicb.2017.01564. eCollection 2017.

Sulfur compounds in intermediate valence states, for example elemental sulfur, thiosulfate, and tetrathionate, are important players in the biogeochemical sulfur cycle. However, key understanding about the pathways of oxidation involving mixed-valance state sulfur species is still missing. Here we...

An improved method of high-precision determination of Δ(17)O of CO2 by catalyzed exchange with O2 using hot platinum.

Rapid communications in mass spectrometry : RCM

Mahata S, Bhattacharya SK, Liang MC.
PMID: 26661978
Rapid Commun Mass Spectrom. 2016 Jan 15;30(1):119-31. doi: 10.1002/rcm.7423.

RATIONALE: CO2 and O2 can exchange their oxygen isotopes rapidly in the presence of hot (~670 °C) platinum and this has led to a method for determining the δ(17)O value of a CO2 sample. We have improved the method...

Radii and Binding Energies in Oxygen Isotopes: A Challenge for Nuclear Forces.

Physical review letters

Lapoux V, Somà V, Barbieri C, Hergert H, Holt JD, Stroberg SR.
PMID: 27517768
Phys Rev Lett. 2016 Jul 29;117(5):052501. doi: 10.1103/PhysRevLett.117.052501. Epub 2016 Jul 27.

We present a systematic study of both nuclear radii and binding energies in (even) oxygen isotopes from the valley of stability to the neutron drip line. Both charge and matter radii are compared to state-of-the-art ab initio calculations along...

Photoneutron cross sections for unstable neutron-rich oxygen isotopes.

Physical review letters

Leistenschneider A, Aumann T, Boretzky K, Cortina D, Cub J, Datta Pramanik U, Dostal W, Elze TW, Emling H, Geissel H, Grünschloss A, Hellstr M, Holzmann R, Ilievski S, Iwasa N, Kaspar M, Kleinböhl A, Kratz JV, Kulessa R, Leifels Y, Lubkiewicz E, Münzenberg G, Reiter P, Rejmund M, Scheidenberger C, Schlegel C, Simon H, Stroth J, Sümmerer K, Wajda E, Walús W, Wan S.
PMID: 11415271
Phys Rev Lett. 2001 Jun 11;86(24):5442-5. doi: 10.1103/PhysRevLett.86.5442.

The dipole response of stable and unstable neutron-rich oxygen nuclei of masses A = 17 to A = 22 has been investigated experimentally utilizing electromagnetic excitation in heavy-ion collisions at beam energies about 600 MeV/nucleon. A kinematically complete measurement...

Dolomitization of the Mid-Pacific Atolls.

Science (New York, N.Y.)

Berner RA.
PMID: 17790828
Science. 1965 Mar 12;147(3663):1297-9. doi: 10.1126/science.147.3663.1297.

The origin of the dolomite which occurs beneath the atolls of Funafuti, Kita-daitō-jima, and Eniwetok in the Pacific Ocean can be explained by the reaction of hypersaline brines with transported or buried reef skeletal material. Dolomitization could have taken...

Oxygen isotope fractionation in the system dolomite-calcite-carbon dioxide.

Science (New York, N.Y.)

O'neil JR, Epstein S.
PMID: 17741631
Science. 1966 Apr 08;152(3719):198-201. doi: 10.1126/science.152.3719.198.

Oxygen isotopes were equilibrated between carbon dioxide and calcite at four temperatures in the range 350 degrees to 610 degrees C and between carbon dioxide and dolomite at 350 degrees and 400 degrees C. Carbon of unusual isotopic composition...

High-resolution record of Northern Hemisphere climate extending into the last interglacial period.

Nature

Andersen KK, Azuma N, Barnola JM, Bigler M, Biscaye P, Caillon N, Chappellaz J, Clausen HB, Dahl-Jensen D, Fischer H, Flückiger J, Fritzsche D, Fujii Y, Goto-Azuma K, Grønvold K, Gundestrup NS, Hansson M, Huber C, Hvidberg CS, Johnsen SJ, Jonsell U, Jouzel J, Kipfstuhl S, Landais A, Leuenberger M, Lorrain R, Masson-Delmotte V, Miller H, Motoyama H, Narita H, Popp T, Rasmussen SO, Raynaud D, Rothlisberger R, Ruth U, Samyn D, Schwander J, Shoji H, Siggard-Andersen ML, Steffensen JP, Stocker T, Sveinbjörnsdóttir AE, Svensson A, Takata M, Tison JL, Thorsteinsson T, Watanabe O, Wilhelms F, White JW.
PMID: 15356621
Nature. 2004 Sep 09;431(7005):147-51. doi: 10.1038/nature02805.

Two deep ice cores from central Greenland, drilled in the 1990s, have played a key role in climate reconstructions of the Northern Hemisphere, but the oldest sections of the cores were disturbed in chronology owing to ice folding near...

Oxygen isotopes in nitrite: analysis, calibration, and equilibration.

Analytical chemistry

Casciotti KL, Böhlke JK, McIlvin MR, Mroczkowski SJ, Hannon JE.
PMID: 17295443
Anal Chem. 2007 Mar 15;79(6):2427-36. doi: 10.1021/ac061598h. Epub 2007 Feb 13.

Nitrite is a central intermediate in the nitrogen cycle and can persist in significant concentrations in ocean waters, sediment pore waters, and terrestrial groundwaters. To fully interpret the effect of microbial processes on nitrate (NO3-), nitrite (NO2-), and nitrous...

Constraints on the duration and freshwater release of Heinrich event 4 through isotope modelling.

Nature

Roche D, Paillard D, Cortijo E.
PMID: 15549102
Nature. 2004 Nov 18;432(7015):379-82. doi: 10.1038/nature03059.

Heinrich events--abrupt climate cooling events due to ice-sheet instability that occurred during the last glacial period--are recorded in sediment cores throughout the North Atlantic Ocean. Modelling studies have described likely physical mechanisms for these events, but the quantitative characteristics...

CO self-shielding as the origin of oxygen isotope anomalies in the early solar nebula.

Nature

Lyons JR, Young ED.
PMID: 15902251
Nature. 2005 May 19;435(7040):317-20. doi: 10.1038/nature03557.

The abundances of oxygen isotopes in the most refractory mineral phases (calcium-aluminium-rich inclusions, CAIs) in meteorites have hitherto defied explanation. Most processes fractionate isotopes by nuclear mass; that is, 18O is twice as fractionated as 17O, relative to 16O....

Episodic growth of the Gondwana supercontinent from hafnium and oxygen isotopes in zircon.

Nature

Kemp AI, Hawkesworth CJ, Paterson BA, Kinny PD.
PMID: 16452978
Nature. 2006 Feb 02;439(7076):580-3. doi: 10.1038/nature04505.

It is thought that continental crust existed as early as 150 million years after planetary accretion, but assessing the rates and processes of subsequent crustal growth requires linking the apparently contradictory information from the igneous and sedimentary rock records....

Widespread magma oceans on asteroidal bodies in the early Solar System.

Nature

Greenwood RC, Franchi IA, Jambon A, Buchanan PC.
PMID: 15959509
Nature. 2005 Jun 16;435(7044):916-8. doi: 10.1038/nature03612.

Immediately following the formation of the Solar System, small planetary bodies accreted, some of which melted to produce igneous rocks. Over a longer timescale (15-33 Myr), the inner planets grew by incorporation of these smaller objects through collisions. Processes...

Showing 1 to 12 of 200 entries