Results 191 to 200 of about 20,788 (267)

Onset of persistent surface ocean oxygenation during the Great Oxidation Event. [PDF]

Nat Commun
Heard AW, Ostrander CM, Shu Y, Bekker A, Poulton SW, Nielsen SG.   +5 more
europepmc   +1 more source

The Relationship Between Catalyst and Solvent in Hydrogenation via Condensed Phase Heterogeneous Catalysis

ChemSusChem, Volume 19, Issue 8, 28 April 2026.
Heterogeneous catalysis has historically been developed in the gas phase, however, we have found it pertinent to highlight solvent effects that must be accounted for in liquid environments. Condensed phase catalysis, like that in biomass, petroleum and the conversion of CO2, stands to benefit from the typically overlooked discussion regarding the ...
Jim B. Floyd, Robert A. Dagle, Jotheeswari Kothandaraman, David J. Heldebrant   +3 more
wiley   +1 more source

Isotopic evidence for volatile loss driven by South Pole-Aitken basin-forming impact. [PDF]

Proc Natl Acad Sci U S A
Tian HC, Zhang C, Li WJ, Xue D, Wang J, Yang W, Liu YH, Lin Y, Li XH, Wu FY.   +9 more
europepmc   +1 more source

Nitrogen Stable Isotopes Track Ammonia Emission Sources and Ammonium Aerosol Formation Processes in the Marine Boundary Layer

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract We measured the nitrogen isotopic composition of surface seawater and aerosol ammonium in the Weddell Sea region of the Southern Ocean to investigate the natural atmospheric cycle of marine ammonia emissions and aerosol ammonium formation in a region not overwhelmed by anthropogenic emissions.
K. E. Altieri, S. Smith, S. E. Fawcett, K. A. M. Spence, M. N. Mathuri, J. Granger   +5 more
wiley   +1 more source

Sulfur isotopes from the lunar farside reveal global volatile loss following the giant impact. [PDF]

Nat Commun
Li Y, Wang Z, Zhang W, Zong K, She Z, He Q, Zheng J, Li T, Pan F, Chen X, Crnobrnja K, Xiao L, Hu Z, Wu X, Liu Y, Siebert J, Moynier F.   +16 more
europepmc   +1 more source

Production, preservation, and biological processing of mass-independent sulfur isotope fractionation in the Archean surface environment. [PDF]

Proc Natl Acad Sci U S A, 2013
Halevy I.
europepmc   +1 more source

Microbially Mediated Intracellular Barite Mineralization: Evidence From an Early Ediacaran Microfossil in the Doushantuo Formation of South China

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Barite serves as a key proxy for reconstructing paleo‐oceanic productivity and chemistry in modern and ancient marine sediments. Although contemporary barite precipitation involves biological mediation, the mechanisms responsible for ancient barite formation remain unclear.
Shiqi Cheng, Lianjun Feng, Yingjie Yang, Xuelei Chu, Xingliang Zhang, Jinhua Li   +5 more
wiley   +1 more source

Martian differentiation history inferred from copper isotopes. [PDF]

Nat Commun
Wang DL, Zhu D, Xu YK, Wang SJ, Li SJ, Liu ZR, Li Y, Li Z, Tang H, Li XY, Liu JZ.   +10 more
europepmc   +1 more source

Sulfur Isotopes Reveal Spatial Variation in Waterbird Trace Element Contamination from Tropical Estuaries to the Open Ocean. [PDF]

Environ Sci Technol
Linhares BA, Bustamante P, Nunes GT, Costa PG, Bugoni L, Zebral YD, Orselli IBM, Martins CMG, Bianchini A.   +8 more
europepmc   +1 more source

An expansive global oxygenation of Earth's surface environments 1.4 billion years ago. [PDF]

Nat Commun
Yan H, Qin Z, Xu L, Mao J, Tang D, Huang Q, Yang X, Li Z, Li J, Li L, Robbins LJ, Kendall B, Canfield DE, Konhauser KO.   +13 more
europepmc   +1 more source