Results 201 to 210 of about 69,048 (265)

Formation of Gallium Monofluoride in the Coordination Sphere of Nickel

Angewandte Chemie, EarlyView.
The elusive gas‐phase species gallium monofluoride forms selectively in the coordination sphere of a nickel(II) centre as a product of C(sp3)–F bond activation, with a weakly coordinating anion as the fluorine source. The herein reported gallium monofluoride ligand acts as a very strong σ‐donor ligand at nickel and serves as a fluorine donor towards ...
Johannes Stephan, Samia Kahlal, Jean‐Yves Saillard, Marvin Mühlau, Lisa Gremmel, Christian Gemel, Roland A. Fischer   +6 more
wiley   +1 more source

CO2‐Induced Reverse Lattice Oxygen Spillover on Pt/CeO2 Enables Sulfur‐Resistant Dry Reforming of Methane

Angewandte Chemie, EarlyView.
A critical step, dry reforming of methane (DRM) converts biogas into useful syngas. Yet trace H2S in biogas rapidly poisons DRM catalysts, limiting practical use. We developed a robust Pt/CeO2 catalyst sustaining DRM activity via CO2‐induced reverse lattice oxygen spillover in H2S‐rich environments.
Jun Liu, Jiang Deng, Jiajia Zheng, Mohsen Beladi Mousavi, Chunning Sun, Jin Li, Xin Chen, Yongjie Shen, Haotian Huang, Ming Xie, Emiliano Cortés, Dengsong Zhang   +11 more
wiley   +1 more source

New Water Oxidation Mechanism in Photosystem II Resolves Major Experimental Controversies

Angewandte Chemie, EarlyView.
In Photosystem II Oxygen Evolving Complex, we discovered the O3‐O6 peroxide at lower energy. Assignment of the O3 ligated by histidine (His337) as a slow exchanging substrate and its coupling with O6 give the O─O bond formation mechanism most consistent with all currently available experimental data. Proposal shows how protein environment can steer the
Yulia Pushkar
wiley   +1 more source

Water‐Mediated Phosphoryl Wires Stabilize Pathological Tau Fibrils

Angewandte Chemie, EarlyView.
Extended 1D phosphoryl “wires” stabilize in‐register amyloid tau fibrils, as demonstrated by multiple‐quantum spin‐counting NMR, TEM, and MD simulations, using fibrils of tau peptide jR2R3‐P301L (tau295–313) with phosphorylation at S305 or Y310. ABSTRACT Hyperphosphorylation of tau is a hallmark of tauopathies, with specific phosphorylation sites ...
Lokeswara Rao Potnuru, Austin DuBose, Fiona Mon, Mesopotamia S. Nowotarski, Michael Vigers, Boqin Zhang, Chung‐Ta Han, John E. Straub, Songi Han   +8 more
wiley   +1 more source

Photocatalytic Lignin Depolymerization and Cross‐Coupling With Alcohols to Produce Unsymmetric Aromatic Diols

Angewandte Chemie, EarlyView.
A photocatalytic approach for efficient one‐pot direct lignin depolymerization and subsequent cross‐coupling with alcohols for the production of unsymmetrical aromatic diols has been demonstrated. ABSTRACT Conversion of lignin into chemical products typically involves two separate steps, such as depolymerization and subsequent upgrading of monomers ...
Hongji Li, Jialing Ma, Xiaoling Wan, Yumei Liu, Chaofeng Zhang, Xiaoqin Si, Xiaojun Shen, Rajenahally V. Jagadeesh   +7 more
wiley   +1 more source

Multi-isotope analysis.

, 2007
Jay, M., Grimes, V., Montgomery, J., Lakin, K., Evans, J.   +4 more
openaire   +1 more source

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Isotopic catalysis and isotopic analysis

Russian Journal of Physical Chemistry B, 2013
Isotopes with magnetic nuclei accelerate the biochemical reactions of adenosine triphosphate synthesis by a factor of two to three. An isotope effect in which isotopes are preserved in the reaction system is known as isotopic catalysis. It has been revealed in enzymatic reactions catalyzed by magnesium, zinc, and calcium ions.
S. E. Arkhangel’skii, Yu. A. Karpov, G. G. Glavin, D. A. Kuznetsov, A. L. Buchachenko   +4 more
openaire   +1 more source

The design and analysis of isotope experiments

The American Journal of Medicine, 1960
Abstract The importance of quantitative isotope technics in the study the metabolism of the whole body is discussed. A number of simple model systems are analyzed and approximate numerical solutions are presented for the investigator who does not require the added precision of more complex mathematical analyses.
openaire   +2 more sources

Isotopic analysis of oxygen in water

The International Journal of Applied Radiation and Isotopes, 1958
Abstract A semimicro method for the oxidation of water to oxygen for mass spectrometry has been developed. Water samples of 25–100 mg are oxidized by bromine in alkaline solution in presence of cobaltic oxide. Paзpaбoтaн пoлyмикpoмeтoдoкиcл eния вoды дo киcлopoдa для мacc-cпeктpoмeтpии Пpoбы вoды в 25–100 мг oкиcляютcя щeлo чным pacтвopoм бpoмa в ...
openaire   +2 more sources

Isotope dilution analysis for speciation

Analytical and Bioanalytical Chemistry, 2003
The advantages of isotope dilution analysis for speciation in the metal species are described. The species-unspecific mode of different species provides accurate and precise determination of the element, because the quantification parameter is an isotope ratio, in spite of an absoluted intensity.
openaire   +2 more sources