Results 111 to 120 of about 4,448 (271)

Isotopic characterization of Jurassic evaporites. Aconcagua-Neuquén Basin, Argentina [PDF]

, 2005
Isotopic analysis can be used to interpret the origin of evaporitic sediments. A preliminary isotopic study of strontium, oxygen and sulphur has been carried out in Ca-sulphate facies of Jurassic marine evaporates (Tábanos Formation and Auquilco ...
Lo Forte, Gabriela L., Lo Forte, Gabriela, Ortí Cabo, Federico, Rosell Ortiz, Laura, Rosell, L., Ortí Cabo, F., Consejo Nacional de Investigaciones Científicas y Técnicas (Argentina), Rosell, Laura (Rosell i Ortiz), Ortí, F., Lo Forte, G. L.   +9 more
core   +1 more source

Large sulfur isotope fractionation in lunar volcanic glasses reveals the magmatic differentiation and degassing of the Moon. [PDF]

Sci Adv, 2021
Saal AE, Hauri EH.
europepmc   +1 more source

Titanium Detected in Liver, Kidney, Spleen, and Intestine Is Not Related to Dose, Time, or Route of Exposure to Titanium Dioxide: A Systematic Review

Environmental Toxicology, EarlyView.
ABSTRACT Titanium dioxide (TiO2), used as a food additive (labeled E171 in Europe), was withdrawn from the European market in 2022. The E171 toxicity mechanism involves its uptake, oxidative stress, DNA damage, and inflammation. It has been hypothesized that the TiO2 accumulation nanoparticles (NPs) or E171 triggers tissue damage, and some studies have
Carmen Ximena Martínez‐Escutia, Estefany I. Medina‐Reyes, Eduardo Delgado‐Armenta, Yolanda I. Chirino   +3 more
wiley   +1 more source

Secular Evolution of Mantle Sulfur Isotopes Since the Archean

Geochemistry, Geophysics, Geosystems
Sulfur isotopes in mantle plume‐derived magmas show heterogeneities attributed to recycling of material from the Earth's surface. The sedimentary sulfur isotope record exhibits dramatic temporal variations over Earth history, raising the question of ...
J. Eguchi, B. A. Black, E. G. Nisbet, Y. Moussallam, G. Georgeais   +4 more
doaj   +1 more source

An Estimate of Sulfur Isotope Fractionation Due to SO₂ Self-Shielding in the Upper Atmosphere of Venus

Atmosphere
Sulfur dioxide is a trace constituent of the upper atmosphere of Venus but plays a dominant role in the photochemistry above the cloud tops. Because SO2 undergoes indirect dissociation to a relatively long-lived excited state, it has a line-type ...
James R. Lyons
doaj   +1 more source

Proteomic and Isotopic Response of Desulfovibrio vulgaris to DsrC Perturbation

Frontiers in Microbiology, 2019
Dissimilatory sulfate reduction is a microbial energy metabolism that can produce sulfur isotopic fractionations over a large range in magnitude. Calibrating sulfur isotopic fractionation in laboratory experiments allows for better interpretations of ...
William D. Leavitt, William D. Leavitt, William D. Leavitt, William D. Leavitt, Sofia S. Venceslau, Jacob Waldbauer, Derek A. Smith, Inês A. Cardoso Pereira, Alexander S. Bradley, Alexander S. Bradley   +9 more
doaj   +1 more source

Interspecific Differences in the Effects on Embryos Between Freshwater and Marine Fish Exposed to Water‐Accommodated Fractions Derived From Very‐Low Sulfur Fuel Oil

Environmental Toxicology, EarlyView.
ABSTRACT This study evaluated the toxic effects of water‐accommodated fractions (WAFs) of very‐low sulfur fuel oil (VLSFO) on freshwater and marine fish embryos. Embryos of Japanese medaka (Oryzias latipes), Java medaka (Oryzias javanicus), and grass puffer (Takifugu alboplumbeus) were exposed to various concentrations of VLSFO‐WAF, and the effects on ...
Jumpei Matsuo, Shusaku Fukugami, Kei Nakayama, Masatoshi Yamasaki, Emiko Kokushi, Seiichi Uno   +5 more
wiley   +1 more source

Droughts and human impact in the ancient Uaymil region of the Maya lowlands inferred from a 2800‐year sedimentary archive at Lake Kaná, Mexico

Boreas, EarlyView.
The relationship between the climate and societal transformation in Maya lowlands has long been debated, particularly the role of drought in shaping the civilization trajectory during the Classic Period. A high‐resolution, multi‐proxy, geochemical record from Lake Kaná, located in the underexplored Uaymil region of the Yucatán Peninsula in Mexico ...
Haydar B. Martinez‐Dyrzo, Priyadarsi D. Roy, Benjamin Gwinneth, Irma G. Vargas‐Martinez, Alejandro A. Aragon‐Moreno, Roger Medina‐Gonzales   +5 more
wiley   +1 more source

Sulfur isotope fractionation during bacterial reduction and disproportionation of thiosulfate and sulfite

, 1998
In bacterial cultures we measured sulfur isotope fractionation during transformations of thiosulfate (S2O32-) and sulfite (SO32-), pathways which may be of considerable importance in the cycling of sulfur in marine sediments and euxinic waters.
Canfield, D., Habicht, Kirsten Silvia, Donald E Canfield, Rethmeier, Jørg, Canfield, Donald Eugene; id_orcid, Kirsten S Habicht, Habicht, K., Rethmeier, J., J̈org Rethmeier   +8 more
core   +1 more source

Drilling the Marathousa palaeo‐lake in Greece (Peloponnese): inferring the environmental context of a Middle Pleistocene archaeological site

Boreas, EarlyView.
The Megalopolis Basin is located in the central Peloponnese (Greece), a region that is situated along one of the primary Pleistocene biogeographical corridors for intracontinental hominin migration. The basin comprises several hundred metres of Plio‐Pleistocene sediments alternating between clastics and lignites.
Ines J. E. Bludau, Bernd Wagner, Uwe Kirscher, Maria Schindler, Charlotte Zachow, Johannes Schmidt, Niklas Leicher, Giovanni Muttoni, Serena Perini, Vangelis Tourloukis, Eleni Panagopoulou, Panagiotis Karkanas, Katerina Harvati, Annett Junginger   +13 more
wiley   +1 more source