Results 101 to 110 of about 255,550 (197)

A systematic 15N‐amino‐acid tracer framework to identify sources of pelagic marine organic matter

Limnology and Oceanography: Methods, EarlyView.
Abstract Accurately tracing organic matter sources in marine systems remains challenging, particularly where natural and anthropogenic inputs coexist. Compound‐specific stable isotope analysis of amino acids (CSIA‐AA) offers strong potential for organic matter source discrimination, but its application is limited by the small number of validated δ15N ...
E. Cepeda, S. Bodé, P. Boeckx, J. Vanaverbeke, U. Braeckman, I. Lizaga   +5 more
wiley   +1 more source

Long‐Term Corrosion of Carbon‐Steel Casing Used in Deep Geological Radioactive Waste Repository

Materials and Corrosion, EarlyView.
Fifty mots 6‐year study of carbon steel corrosion in a deep geological repository (Bure, France). Three corrosion patterns were identified, driven by local conditions. Minimal corrosion layer thickness growth suggests limited corrosion progression under most conditions.
Mahado Saïd Ahmed, Delphine Neff, Annabelle Vernouillet, Xavier Bourbon, Didier Crusset, Gaëlle Charrier, Valérie Maillot, Philippe Dillmann   +7 more
wiley   +1 more source

University teaching of mass spectrometry as a key practical technique within the context of a fully integrated, spiral curriculum

Rapid Communications in Mass Spectrometry, EarlyView.
Rationale Mass spectrometry (MS) is introduced to high school students in the UK in many pre‐university course syllabi. As such, we have identified the use of MS as a key technique that should be taught practically to undergraduates from the outset of their studies.
Andrew F. Worrall, Craig D. Campbell, Megan O. Midson, Malcolm I. Stewart   +3 more
wiley   +1 more source

Macroscopic Convective Fluid Flows Arising From Binding of Ions and Small Molecules to Proteins

Small, EarlyView.
The interaction of ions or small molecules with proteins causes convective flows due to the displacement of water from the hydration shell. As shown, the replacement of the nickel ion removed from urease by EDTA pre‐treatment results in binding‐induced convective fluid flow.
Shanid Babu Shrestha, Jiaqi Song, Ali Heydari, Igor S. Aranson, Ayusman Sen   +4 more
wiley   +1 more source

Absolute isotopic abundance ratios and the atomic weight of a reference sample of chromium

, 1966
Absolute values have been obtained for the isotopic abundance ratios of a reference sample of chromium, using surface emission mass spectrometry. Samples of known isotopic composition, prepared from nearly pure separated chromium isotopes, were used to ...
Shields, William R.; Murphy, Thomas J.; Catanzaro, Edward J.; Garner, Ernest L.
core   +1 more source

Bifunctional Electrocatalysts in Rechargeable Lithium‐Gas Batteries: Material Evolution and Mechanistic Insights from Metal‐Free Carbons to Carbon‐Supported Single‐Atom Sites

Small, EarlyView.
This review charts the material evolution of bifunctional electrocatalysts for rechargeable lithium‐gas batteries. It highlights the journey from heteroatom‐doped, metal‐free carbon architectures to precision‐engineered carbon‐supported single‐atom sites. The discussion focuses on mechanistic insights into how these catalysts govern reversible O2, CO2,
Daming Ren, Shuimei Chen, Yuzheng Wu, Xiaodan Huang, Jong Beom Baek, Ashok Kumar Nanjundan   +5 more
wiley   +1 more source

Zoning and contamination rate of magnesium and heavy metals of iron, zinc and copper in the north and northwest aquifer of Khoy (Zourabad) based on GIS and determining the contaminated source

Journal of Economic Geology, 2015
Introduction Heavy metals are the most toxic pollutants in aquatic ecosystems. This contamination can result from the release of heavy metal elements during alteration and weathering of ultramafic and mafic rocks (ophiolite zones).
Fariborz Khodadadi, Abdolnaser Fazlnia, Hossein Pirkharrati   +2 more
doaj  

Chromium-Catalyzed Alkene Isomerization with Switchable Selectivity

We report a single additive-responsive chromium-catalyzed system for selectively producing either of two different internal alkene isomers. The chromium catalyst, in the presence of HBpin/LiOtBu, enables the isomerization of alkenes over multiple carbon ...
Xiaoming Zeng (20417), Xuelan Wang (2177024), Meiming Luo (1626832), Jiaoyue Zhong (13853412)   +3 more
core   +1 more source

Fluctuations in Precambrian atmospheric oxygenation recorded by chromium isotopes

, 2009
Geochemical data1,2,3,4 suggest that oxygenation of the Earth’s atmosphere occurred in two broad steps. The first rise in atmospheric oxygen is thought to have occurred between ∼2.45 and 2.2 Gyr ago1,5, leading to a significant increase in atmospheric ...
Claudio Gaucher, Gaucher, Claudio, Robert Frei, Poulton, Simon W., Don E. Canfield, Simon W. Poulton, Canfield, Donald Eugene; id_orcid, Poulton, S.W., Canfield, D.E., Frei, Robert   +9 more
core   +1 more source

Rapid Fabrication of Sub‐100 µm Microstructures In Situ via Femtosecond Laser for Correlative Imaging of Rare Cells

Small, EarlyView.
In this work, a femtosecond (fs) laser processing strategy is demonstrated for rapid and targeted fabrication of 3D sub‐100‐µm microstructures on resin‐embedded cells. The fabricated array of sub‐100‐µm pillars (each loaded with flow‐sorted T‐cell subsets) is arranged in a half‐grid geometry to enable efficient use of the scarce biological sample and ...
Aristide Djoulde, Yaping Chen, Vahid R. Adineh, Yang Liu, Boyin Liu, Di Yu, Jing Fu   +6 more
wiley   +1 more source