Results 151 to 160 of about 248,597 (344)

A Generalized Approach for Distal C–H Arylation of Organic Building Blocks: Unveiling the Role of Counter Anion

Advanced Science, EarlyView.
We report a general strategy for meta‐selective C–H arylation using aryl iodides and a Pd(II)/Pd(IV) catalytic system guided by a removable directing group. DFT and experimental studies reveal that counter anion tuning (acetate to trifluoroacetate) significantly enhances selectivity.
Jagrit Grover, Gaurav Prakash, Astam Mandal, Devika Ghosh, Siddhartha Maiti, Claire Empel, Debabrata Maiti   +6 more
wiley   +1 more source

Beyond Sabatier: Multiplicate Spillover Phenomena for Manipulating Catalytic Dynamics in Various Electrocatalysis

Advanced Science, EarlyView.
Various spillover‐mediated electrocatalytic reactions, such as hydrogen and oxygen evolution, carbon dioxide and nitrogen reduction, and methanol oxidization reactions, are systematically summarized. Abstract Spillover phenomenon, which is characterized by the dynamic migration of active species across catalyst surfaces, provides a promising avenue to ...
Di Wang, Ziyou Dong, Qianqian Yao, Shixue Dou, Jun Mei, Ziqi Sun   +5 more
wiley   +1 more source

Patterns of δ13C and δ15N in wolverine Gulo gulo tissues from the Brooks Range, Alaska

Current Zoology, 2009
Knowledge of carnivore diets is essential to understand how carnivore populations respond demographically to variations in prey abundance. Analysis of stable isotopes is a useful complement to traditional methods of analyzing carnivore diets.
Fredrik DALERUM, Anders ANGERBJÖRN, Kyran KUNKEL, Brad S. SHULTS   +3 more
doaj  

Polyoxometalate as Hydrogen–Electron Hub in Metal–Organic Complex for Electrocatalytic Nitrate Reduction to Ammonia

Advanced Science, EarlyView.
To tackle low electrocatalytic nitrate reduction to ammonia efficiency in neutral media, this work designs chain‐like dinuclear/trinuclear polyoxometalate‐based metal‐organic complexes. Metal clusters provide nitrate adsorption/activation sites, while polyoxometalates (POMs) drive water dissociation to generate active hydrogen (*H) that migrates to ...
Qiushuang Jiang, Xinming Wang, Shengji Tian, Haijun Pang, Yongbin Song, Huiyuan Ma   +5 more
wiley   +1 more source

Computation‐Guided Dual‐Site Electrocatalysts for Record‐Performance Nitrite‐to‐Ammonia Conversion

Advanced Science, EarlyView.
Designing Cu doped ZnO catalysts for NO2RR via first principles calculation and boosting electrocatalytic nitrite reduction through Cu‐ZnO synergistic deoxygenation, hydrogenation, and NH3 desorption. Cu doping elevates the d‐band center of Zn, strengthening *NO2 binding and deoxygenation, while ZnO sites regulate water adsorption and dissociation ...
Hui Zhang, Haiyan Duan, Donglin Han, Zhenlin Wang, Xingchi Li, Dengchao Peng, Lupeng Han, Tianting Pang, Evangelina Pensa, Wenqiang Qu, Yongjie Shen, Haotian Wang, Wei Ren, Ming Xie, Emiliano Cortés, Dengsong Zhang   +15 more
wiley   +1 more source

Stable isotopes and changing paradigms on soil nitrogen and carbon biogeochemistry

Ecosistemas, 2010
Muchos de los modelos conceptuales e ideas desarrollados en el ámbito de la biogeoquímica se basan en diagramas de flujo que representan las reservas de nutrientes como "cajas" interconectadas por "flechas" que indican los procesos abióticos y bióticos ...
J. A. Carreira, B. Viñegla, M. C. Blanes, R. García-Ruiz   +3 more
doaj  

Structural Basis of the Membrane Association by the Conserved RocS Membrane‐Targeting Sequence in Streptococcus

Advanced Science, EarlyView.
Chromosome segregation in Streptococcus pneumoniae depends on RocS, a bitopic protein whose membrane‐anchoring mechanisms were unclear. Using NMR and AFM, this study reveals that the widely conserved RocS anchor binds to membranes via a conserved kink‐helix motif which inserts into lipid nanodomains.
Ana Álvarez‐Mena, Estelle Morvan, Clara Lambert, Anagha Kallisseri Parambil, Martin Lefeuvre, Zeren Xu, Nadia El Mammeri, Florian Malard, Erick J. Dufourc, Cécile Feuillie, Christophe Grangeasse, Birgit Habenstein   +11 more
wiley   +1 more source

Electronic Interaction at Cu–O–Ni Heterointerface Promotes Electrocatalytic Nitrate Reduction to Ammonia and Zinc‐Nitrate Battery

Advanced Science, EarlyView.
The strong Cu–O–Ni electronic interaction in the heterostructured catalyst can enhance the effective adsorption of NO3− and accelerate the in situ hydrolysis dissociation of the hydrogenation step. The Zn‐NO3 hybrid battery assembled with this catalyst achieves an open‐circuit voltage of 1.45 V, a peak power density of 6.47 mW cm−2, and can ...
Taozhi Lv, Lekuan Yang, Can Hong, Yihua Zhu, Jianhua Shen, Chunzhong Li   +5 more
wiley   +1 more source

Trophic discrimination of nitrogen stable isotopes in amino acids varies with diet quality in a marine fish

, 2015
K. McMahon, S. Thorrold, T. Elsdon, M. McCarthy   +3 more
semanticscholar   +1 more source

Nitrogen stable isotope fractionation by biological nitrogen fixation reveals cellular nitrogenase is diffusion limited

PNAS Nexus
Abstract Biological fixation of dinitrogen (N2), the primary natural source of new bioavailable nitrogen (N) on Earth, is catalyzed by the enzyme nitrogenase through a complex mechanism at its active site metal cofactor. How this reaction functions in cellular environments, including its rate-limiting step, and how enzyme structure ...
Eunah Han, Sebastian H Kopf, Ashley E Maloney, Xuyuan Ellen Ai, Daniel M Sigman, Xinning Zhang   +5 more
openaire   +2 more sources