Results 31 to 40 of about 21,930 (288)

Is deoxygenation detectable before warming in the thermocline? [PDF]

, 2020
International audienceAnthropogenic greenhouse gas emissions cause ocean warming and oxygen depletion, with adverse impacts on marine organisms and ecosystems. Warming is one of the main indicators of anthropogenic climate change, but, in the thermocline,
Joos, Fortunat, Hameau, Angélique, Frölicher, Thomas L., Mignot, Juliette, Frölicher, Thomas, L   +4 more
core   +2 more sources

Assessing the contribution of euphausiids’ fecal pellets to greenhouse gas inventories in the Eastern South Pacific

Frontiers in Marine Science
The Eastern South Pacific (ESP) is a highly heterogeneous environment, characterized by a productivity gradient that goes from eutrophic waters in the coastal zone to ultraoligotrophic waters in the center of the South Pacific Gyre. Its coastal region is
Paula M. Ruz-Moreno, Marcela Cornejo-D’Ottone, Macarena Díaz-Astudillo, Iohandy Skamiotis-Gómez, Ramiro Riquelme-Bugueño   +4 more
doaj   +1 more source

The bifunctional enzyme, GenB4, catalyzes the last step of gentamicin 3′,4′-di-deoxygenation via reduction and transamination activities

Microbial Cell Factories, 2020
Background New semi-synthetic aminoglycoside antibiotics generally use chemical modifications to avoid inactivity from pathogens. One of the most used modifications is 3′,4′-di-deoxygenation, which imitates the structure of gentamicin.
Xiaotang Chen, Hui Zhang, Shaotong Zhou, Mingjun Bi, Shizhou Qi, Huiyuan Gao, Xianpu Ni, Huanzhang Xia   +7 more
doaj   +1 more source

Engineering Atomically Precise Cu4I4 Nanoclusters With Integrated Adsorption and Hydrogenation Functions for Efficient Photocatalytic Nitrate‐to‐Ammonia Conversion

Angewandte Chemie, EarlyView.
Efficient photocatalytic nitrate‐to‐ammonia conversion is achieved over an atomically precise Cu4I4 motif through dual‐site cooperation. Lewis‐acidic Cu centers promote nitrate adsorption and activation, while adjacent I sites facilitate active hydrogen generation for stepwise hydrogenation.
Wanting Zhang, Yuehua Li, Junjie Jin, Chunwei Dong, Xi Cao, Xingchi Li, Xuanjun Wu, Jiaqi Wang, Atta Ullah, Gaspar Ferreyra Vaggione, Rodrigo A. Iglesias, Yun Chen, Emiliano Cortés, Dengsong Zhang   +13 more
wiley   +2 more sources

Efficient Conversion of Lignin to Aromatics via Catalytic Fast Pyrolysis over Niobium-Doped HZSM-5

Molecules, 2023
A niobium-doped HZSM-5 (H[Nb]ZSM-5) was prepared by a hydrothermal synthesis method. The morphology, phase structure, composition, pore structure, and acid content of the catalyst were characterized using a series of analysis techniques such as scanning ...
Zhen Li, Huihui Zhang, Deshi Yang, Zhipeng Hu, Fengqiang Wang, Zhijun Zhang   +5 more
doaj   +1 more source

Insights in Catalytic Denitrogenation and Deoxygenation on Whole Molecules and Aromatic Cores of Dongming Coal in Four Solvents by Using Ion-Source Collision-Activated Dissociation Mass Spectrometry [PDF]

, 2018
Insights in Catalytic Denitrogenation and Deoxygenation on Whole Molecules and Aromatic Cores of Dongming Coal in Four Solvents by using Ion-Source Collision-Activated Dissociation Mass ...
Xueming, Dong, Chu-Fan, Wang, Yun-Peng, Zhao, Xing, Fan, Xian-Yong, Wei, Ge, Wu, Feng-Yun, Ma   +6 more
core   +1 more source

Role of Graphene Oxide in the Nucleation and Growth of Gold Nanoparticles Revealed by Operando Time‐Resolved Studies

Angewandte Chemie, EarlyView.
Graphene oxide accelerates AuCl4− reduction under irradiation and directs edge‐selective nucleation and quasi‐one‐dimensional organization of gold nanoparticles at oxygen‐rich boundaries. Operando SAXS and UV–vis spectroscopy, supported by pulse radiolysis and DFT, reveal how progressive conversion of GO to rGO removes interfacial constraints, shifting
Liran Hu, Carine Clavaguéra, Zhenpeng Cui, Zhiwen Jiang, Thomas Bizien, Filippo Ferdeghini, Nguyen‐Thi Van‐Oanh, Michel Goldmann, François Muller, Samy Remita   +9 more
wiley   +2 more sources

Scandium-catalyzed deoxygenation of alcohols and ketones using hydrosilanes as reductants

International audienceGiven the depletion of oil reserves and the urgency of combating climate change, enhancing energy efficiency and resource utilization in chemical processes is paramount for sustainable development.
Bousrez, Guillaume, Cantat, Thibault, Nicolas, Emmanuel, Monsigny, Louis, Thyagarajan, Neethu   +4 more
core   +3 more sources

Could Artificial Downwelling/Upwelling Mitigate Oceanic Deoxygenation in Western Subarctic North Pacific?

Frontiers in Marine Science, 2021
Subpolar gyre regions such as the Western Subarctic North Pacific (WSNP) contain sluggish, low-oxygen water, and are threatened by loss of oxygen (deoxygenation).
Canbo Xiao, Wei Fan, Ying Chen, Ying Chen, Yao Zhang, Kai Tang, Nianzhi Jiao   +6 more
doaj   +1 more source

Oxygen‐Tolerant, Controlled Synthesis of Degradable and Water‐Soluble Poly(Vinyl Amide)s via Radical Ring‐Opening Copolymerization of Cyclic Dithiothreitol

Angewandte Chemie, EarlyView.
Oxygen‐tolerant photoinduced electron/energy transfer reversible addition–fragmentation chain transfer (PET‐RAFT) polymerization enables the controlled radical ring‐opening (rROP) copolymerization of cyclic dithiothreitol (cDTT) with less‐activated vinyl monomers, affording degradable polymers with predictable molecular weights, low dispersities, and ...
Alessandro Magro, Ivan O. Levkovsky, Hironobu Murata, Francesca Lorandi, Edmondo M. Benetti, Krzysztof Matyjaszewski   +5 more
wiley   +2 more sources