Results 81 to 90 of about 7,726,116 (235)

Atypical Condensation Domains Guide Discovery and Illuminate Biosynthesis of Myxoglucamides Featuring Vinyl‐Substituted, α‐Oxidized γ‐Amino Acids

Angewandte Chemie, EarlyView.
Genome mining of atypical condensation (C) domains leads to the discovery of myxoglucamides, glycolipopeptides featuring an unprecedented vinyl‐substituted, α‐oxidized γ‐amino acid. Biosynthetic studies reveal a discrete C‐domain‐like O‐acyltransferase, a β‐hydroxylation‐dependent chain‐extension checkpoint, and an unusual pathway for γ‐amino acid ...
Tingting Wang, Alexander Popoff, Maja Hunter, Guangzhi Dai, Ronald Garcia, Huixin Xu, Haowen Zhao, Asfandyar Sikandar, Liujie Huo, Rolf Müller, Chengzhang Fu   +10 more
wiley   +2 more sources

Modulating Covalent Organic Framework Nanochannel Microenvironments for Sustainable Hydrogen Peroxide Photosynthesis

Angewandte Chemie, EarlyView.
Alkoxy side chains regulate hydrazone‐linked COF nanochannel microenvironments by tuning pore polarity, reactant adsorption, and charge‐separation behavior. The optimized framework facilitates oxygen activation and hydrogen peroxide photosynthesis in real water and a 1 L natural‐sunlight reactor. LCA further shows that natural sunlight and larger‐scale
Ruixue Sun, Shaoyang Gao, Luqiao Feng, Peixuan Xie, Wenyu Shen, Nikita Rog, Marwan Mohammed, Qi Huang, Giulio Santori, Xianfeng Fan, Bien Tan, Cher Hon Lau   +11 more
wiley   +2 more sources

Radiocarbon dating for contemporary art: hardware developments and measurements [PDF]

, 2012
The research developed during my PhD can be inserted within the activities of the Archaeometry Laboratory of the Physics Department of the University of Ferrara, where works of art are studied using non invasive and non destructive techniques for ...
Caforio, Lucia Anna
core  

Maximizing Active Site Density in Tin Single‐Site Catalysts for Selective Carbon Dioxide to Formate Electroreduction

Angewandte Chemie, EarlyView.
High‐loading tin single‐site catalysts (>7.5 wt.% Sn) are synthesized using a nitrogen‐enriched carbon scaffold and mechanochemically assisted pyrolysis to stabilize atomically dispersed Sn. The resulting Sn/N‐C‐M catalyst enables highly selective CO2‐to‐formate conversion (>90% FE across 50–500 mA cm−2) with long‐term durability and operando‐verified ...
Katharina Potemkin, Soressa Abera Chala, Chia‐Yu Chang, Keseven Lakshmanan, Meng‐Che Tsai, Tobias Rios Studer, Elnaz Ebrahimi, Nico Achenbach, Rongji Liu, Johannes Biskupek, Ute Kaiser, Bing Joe Hwang, Carsten Streb   +12 more
wiley   +2 more sources

Gain‐of‐Function Engineering of the NifEN Scaffold Into a Self‐Assembling Nitrogenase

Angewandte Chemie, EarlyView.
From scaffold to enzyme: Systematic engineering of the cofactor maturation scaffold NifEN reconstructs the P→M electron relay along with cofactor coordination and proton gating at the S2B site, converting NifEN into a functional nitrogenase capable of ATP‐dependent N2 reduction both in vitro and in vivo.
Yimo Yang, Chi Chung Lee, Steve Ortiz, Markus W. Ribbe, Yilin Hu   +4 more
wiley   +2 more sources

The Effects of Possible Contamination on the Radiocarbon Dating of the Dead Sea Scrolls II: Empirical Methods to Remove Castor Oil and Suggestions for Redating [PDF]

, 2009
While kept at the Rockefeller Museum in East Jerusalem, many Dead Sea Scroll fragments were exposed to castor oil by the original team of editors in the course of cleaning the parchments.
Højrup, Peter, Pedersen, Carl Th., Rasmussen, Kaare Lund,, Pedersen, Carl Th.,, Rasmussen, Kaare Lund, Halfdan Stenby, Erling, van der Plicht, Johannes, Pedersen, Carl Th, Stenby, Erling Halfdan,, Lund Rasmussen, Kaare, Doudna, Gregory,, Doudna, Gregory, Nielsen, Frederik, Stenby, Erling Halfdan, Nielsen, Frederik,, Hojrup, Peter, Højrup, Peter,, Plicht, Johannes van der,   +17 more
core   +2 more sources

Heterogeneous Os isotope compositions in the Kalatongke sulfide deposit, NW China: the role of crustal contamination [PDF]

, 2012
Re-Os isotope compositions of mantle-derived magmas are highly sensitive to crustal contamination because the crust and mantle have very different Os isotope compositions.
Zhou, MF, Lightfoot, PC, Gao, JF, Qu, W, Peter C. Lightfoot, Mei-Fu Zhou, Wenjun Qu, Jian-Feng Gao   +7 more
core   +1 more source

Natural Sunlight IR‐Driven Highly Efficient Synthesis of Acetaldehyde From Bioethanol Over Cu/Fe2O3

Angewandte Chemie, EarlyView.
This work reports a Cu/Fe2O3 catalyst for the conversion of bioethanol into valuable acetaldehyde and green hydrogen under both infrared (IR) light and natural sunlight. This IR‐driven system sets a new performance benchmark, with TON and initial TOF enhanced by at least one order of magnitude, enabled by a constructed IR photon‐to‐phonon channel and ...
Xiyi Li, Jiangting Zhao, Junjun Guo, Ze‐Kai Yu, Enqi Chen, Qiong Liu, Tieou Wang, Asterios Gavriilidis, Xue‐Qing Gong, Yang Lan, Junwang Tang   +10 more
wiley   +2 more sources

Dating of hydrocarbons with Re-Os isotopes: Experimental investigation of the behavior of Re-Os in petroleum

, 2013
Le géochronomètre Re-Os a fait ses preuves dans son application aux huiles et bitumes pétroliers. Cependant, l’application de ce système sur les fluides pétroliers souffre d’un manque de compréhension de la géochimie pétrolière de Re et Os, des mécanismes de remise à zéro du géochronomètre et par conséquent des évènements réellement datés.
openaire   +1 more source

High‐Pressure Synthesis of Quantum‐Stabilised Manganese Superhydride MnH7

Angewandte Chemie, EarlyView.
Superhydrides are a rarity in transition metal hosts. Through high‐pressure, high‐temperature diamond anvil cell studies, the most hydrogen‐rich transition metal hydride, MnH7${\rm MnH}_7$ has been synthesised. Density functional theory calculations demonstrate that zero‐point energy stabilises the crystalline structure that MnH7${\rm MnH}_7$ adopts ...
Mikhail A. Kuzovnikov, Hannah A. Shuttleworth, Israel Osmond, Huixin Hu, Elvita Meskauskaite, Bole Chen, Callum Stevens, Andrew Huxley, Andreas Hermann, Miriam Peña‐Alvarez, Ross T. Howie   +10 more
wiley   +2 more sources