Results 131 to 140 of about 20,684 (285)

Rationales for the Choice of Metals for Super‐Reduced Biological Metal Centers: Cobalt in Cobalamin Versus Nickel in F430

Chemistry – A European Journal, EarlyView.
DFT calculations on porphyrin, corrin, and corphin complexes of cobalt, rhodium, iron, manganese, or nickel, and QM/MM calculations on enzyme models, explore the factors controlling the availably of super‐reduced metal(I) states. True metal(I) states are seen in corrin only for cobalt, in corphin only for nickel, and not at all in porphyrin.
Radu‐Ioan Onija, Sergiu‐Raul Cosma, Adrian M. V. Brânzanic, Radu Silaghi‐Dumitrescu   +3 more
wiley   +1 more source

An improved narrower-diameter EA/IRMS method with a built-in desulfurization reactor: optimization for nitrogen and carbon measurement without sulfur matrix interference

Progress in Earth and Planetary Science
Elemental analysis with isotope ratio mass spectrometry (EA/IRMS) is a widely used technique for stable isotope ratio analysis of nitrogen and carbon. Although the narrower-diameter EA/IRMS method developed to date has effectively enhanced sensitivity ...
Yohei Matsui, Wataru Fujisaki, Takahiro Aze, Toshihiro Miyajima, Shinsuke Kawagucci, Eiji Tasumi, Masahiro Yamamoto, Yoshinori Takano, Tomohiro Toki   +8 more
doaj   +1 more source

Dietary homogenization and spatial distributions of carbon, nitrogen, and sulfur isotope ratios in human hair in South Korea. [PDF]

PLoS One, 2021
Lee HS, Shim JY, Shin WJ, Choi SH, Bong YS, Lee KS.   +5 more
europepmc   +1 more source

Sulfur and Oxygen Isotope Fractionation During Bacterial Sulfur Disproportionation Under Anaerobic Haloalkaline Conditions

, 2016
Sulfur and oxygen isotope fractionation of elemental sulfur disproportionation at anaerobic haloalkaline conditions was evaluated for the first time. Isotope enrichment factors of the strains Desulfurivibrio alkaliphilus and Dethiobacter alkaliphilus ...
Knöller, Kay (author), Finster, Kai W. (author), Poser, Alexander (author), Kay Knöller (842790), Vogt, Carsten, Kai W. Finster (842792), Alexander Poser (842788), Sorokin, Dimitry Y. (author), Sorokin, Dimitry Y., Richnow, Hans H., Finster, Kai W., Knöller, Kay, Hans-H. Richnow (842793), Poser, Alexander, Vogt, Carsten (author), Richnow, Hans H. (author), Carsten Vogt (842789), Dimitry Y. Sorokin (842791)   +17 more
core   +1 more source

One‐Shot Pd(II)‐Catalyzed Multiple C–H Activation Enables Modular Construction of Fluorenylidene Oxindole‐Based Multi(Polycyclic) Aromatic Enes

Chemistry – A European Journal, EarlyView.
A one‐shot Pd(II)‐catalyzed C─H activation strategy enables the rapid conversion of simple linear propiolamides into structurally diverse mono‐, di‐, and tri‐olefin‐bridged MPAEs. This cascade process orchestrates up to six sequential C–H activations in a single operation, providing streamlined access to highly conjugated architectures.
Haiyu Wang, Kouki Sakata, Takuma Sato, Masahiro Terada, Tienan Jin   +4 more
wiley   +1 more source

Safe, accurate, and precise sulfur isotope analyses of arsenides, sulfarsenides, and arsenic and mercury sulfides by conversion to barium sulfate before EA/IRMS. [PDF]

Anal Bioanal Chem, 2022
Spangenberg JE, Saintilan NJ, Palinkaš SS.   +2 more
europepmc   +1 more source

Nitrooxylation in Organic Synthesis: From Classical Nitrate Ester Formation to Modern Catalytic Strategies

Chemistry – A European Journal, EarlyView.
Nitrooxylation—the installation of nitrate esters (–ONO2) has evolved from classical mixed‐acid protocols to catalytic and mechano‐, flow‐, photo‐, and electrochemical strategies. This review delineates ionic and radical manifolds for C–ONO2 bond formation, emphasizing mechanistic control, selected substrate scope, and selectivity.
Jayanta Dey, Dmitry Katayev
wiley   +1 more source

Geology, Alteration, Geochemistry, and Regional Sulfur Isotope Constraints on Pb–Zn ± Cu Mineralization in the Biga Peninsula (NW Türkiye): Insights from the Kocayayla Deposit

Applied Sciences
The Kocayayla Pb–Zn ± Cu vein-type mineralization is located in the Biga Peninsula, northwestern Türkiye. This study aims to constrain the geological, geochemical, and isotopic characteristics of the mineralization and to clarify its genetic ...
Sinan Akıska, Gökhan Demirela
doaj   +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

Mass-independent sulfur isotope fractionation during photochemistry of sulfur dioxide

, 2015
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2015.Cataloged from PDF version of thesis.Includes bibliographical references (pages 161-175).Mass-independent sulfur isotope signatures are ...
Whitehill, Andrew (Andrew Richard)
core