The high activity of step sites on Pd nanocatalysts in electrocatalytic dechlorination

2022 ◽  
Author(s):  
Yao-Yin Lou ◽  
Chi Xiao ◽  
jiayi Fang ◽  
Tian Sheng ◽  
Lifei Ji ◽  
...  
Keyword(s):  
High Activity ◽  
Electrocatalytic Dechlorination ◽  
Dechlorination Reaction

The role of step sites on nanocatalysts in electrocatalytic dechlorination reaction (ECDR) is studied by using 3 Pd nanocatalysts with different density of step sites, which is decreasing on tetrahexahedral...

Electrocatalytic dechlorination of 2,4-DCBA using CTAB functionalized Pd/GAC movable granular catalyst: Role of adsorption in catalysis

2021 ◽  
Vol 414 ◽  
pp. 128758
Author(s):  
Jiasheng Zhou ◽  
Zimo Lou ◽  
Zheni Wang ◽  
Chuchen Zhou ◽  
Cheng Li ◽  
...  
Keyword(s):  
Electrocatalytic Dechlorination ◽  
Granular Catalyst

scholarly journals Functional cross-talk between allosteric effects of activating and inhibiting ligands underlies PKM2 regulation

2018 ◽  
Author(s):  
Jamie A. Macpherson ◽  
Alina Theisen ◽  
Laura Masino ◽  
Louise Fets ◽  
Paul C. Driscoll ◽  
...  
Keyword(s):  
Enzymatic Activity ◽  
High Activity ◽  
Pyruvate Kinase ◽  
Cross Talk ◽  
Glycolytic Enzyme ◽  
Computational Framework ◽  
Allosteric Inhibitor ◽  
Fructose 1,6 Bisphosphate ◽  
Low Activity

ABSTRACTAllosteric regulation is central to the role of the glycolytic enzyme pyruvate kinase M2 (PKM2) in cellular metabolism. Multiple activating and inhibitory allosteric ligands regulate PKM2 activity by controlling the equilibrium between high activity tetramers and low activity dimers and monomers. However, it remains elusive how allosteric inputs upon simultaneous binding of different ligands are integrated to regulate PKM2 activity. Here, we show that, in the presence of the allosteric inhibitor L-phenylalanine (Phe), the activator fructose 1,6-bisphosphate (FBP) can induce PKM2 tetramerisation, but fails to maximally increase enzymatic activity. Guided by a new computational framework we developed to identify residues that mediate FBP-induced allostery, we generated two PKM2 mutants, A327S and C358A, in which activation by FBP remains intact but cannot be attenuated by Phe. Our findings demonstrate a role for residues involved in FBP-induced allostery in enabling the integration of allosteric input from Phe and reveal a mechanism that underlies the co-ordinate regulation of PKM2 activity by multiple allosteric ligands.

scholarly journals Origin of the electrocatalytic activity in carbon nanotube fiber counter-electrodes for solar-energy conversion

2020 ◽  
Vol 2 (10) ◽  
pp. 4400-4409
Author(s):  
Alba Martínez-Muíño ◽  
Moumita Rana ◽  
Juan J. Vilatela ◽  
Rubén D. Costa
Keyword(s):  
Solar Cells ◽  
Carbon Nanotube ◽  
Solar Energy ◽  
High Activity ◽  
Functional Groups ◽  
Electrocatalytic Activity ◽  
Counter Electrodes ◽  
Fe Catalyst ◽  
Carbon Nanotube Fiber

A study of the role of functional groups and residual Fe catalyst on the high activity of carbon nanotube (CNT) fibre counter electrodes outperforming Pt in dye-sensitised solar cells (DSSCs) with Co2+/Co3+ redox couple electrolytes.

scholarly journals Role of RsbU in Controlling SigB Activity in Staphylococcus aureus following Alkaline Stress

2009 ◽  
Vol 191 (8) ◽  
pp. 2561-2573 ◽  
Author(s):  
Jan Pané-Farré ◽  
Beate Jonas ◽  
Steven W. Hardwick ◽  
Katrin Gronau ◽  
Richard J. Lewis ◽  
...  
Keyword(s):  
Staphylococcus Aureus ◽  
High Activity ◽  
Protein Phosphatase ◽  
Sigma Factor ◽  
Alternative Sigma Factor ◽  
Alkaline Stress ◽  
High Molecular Weight Complex ◽  
Terminal Domain ◽  
Related Organism

ABSTRACT SigB is an alternative sigma factor that controls a large regulon in Staphylococcus aureus. Activation of SigB requires RsbU, a protein phosphatase 2C (PP2C)-type phosphatase. In a closely related organism, Bacillus subtilis, RsbU activity is stimulated upon interaction with RsbT, a kinase, which following an activating stimulus switches from a 25S high-molecular-weight complex, the stressosome, to the N-terminal domain of RsbU. Active RsbU dephosporylates RsbV and thereby triggers the release of SigB from its inhibitory complex with RsbW. While RsbU, RsbV, RsbW, and SigB are conserved in S. aureus, proteins similar to RsbT and the components of the stressosome are not, raising the question of how RsbU activity and hence SigB activity are controlled in S. aureus. We found that in contrast to the case in B. subtilis, the induced expression of RsbU was sufficient to stimulate SigB-dependent transcription in S. aureus. However, activation of SigB-dependent transcription following alkaline stress did not lead to a clear accumulation of SigB and its regulators RsbV and RsbW or to a change in the RsbV/RsbV-P ratio in S. aureus. When expressed in B. subtilis, the S. aureus RsbU displayed a high activity even in the absence of an inducing stimulus. This high activity could be transferred to the PP2C domain of the B. subtilis RsbU protein by a fusion to the N-terminal domain of the S. aureus RsbU. Collectively, the data suggest that the activity of the S. aureus RsbU and hence SigB may be subjected to different regulation in comparison to that in B. subtilis.

scholarly journals Decline of the Byzantine Thalassocracy

2020 ◽  
Vol 22 (4 (202)) ◽  
pp. 126-138
Author(s):  
Tatiana V. Kushch ◽  
Keyword(s):  
High Activity ◽  
Transport System ◽  
Eastern Mediterranean ◽  
Byzantine Empire ◽  
Loss Of Control ◽  
The West ◽  
Material Resources ◽  
External Relations ◽  
Written Sources

After 1204, the Byzantine Empire lost control over the Eastern Mediterranean. The restoration of the Empire in 1261, however, did not recover its sea dominance. The Latins, especially the Venetians and the Genoese, who had possessions in the Aegean and the Black Seas and conducted active maritime trade there, established themselves in the region. The importance of sea routes for Byzantium increased dramatically given the territorial dispersion of the Byzantine possessions, the high activity of Europeans in the region, and the growing threat of an Ottoman conquest. This article analyses the specifics of Byzantine sea communications and their role in the fate of the Empire during the period of geopolitical changes between the fourteenth and fifteenth centuries. Based on written sources, the author examines the condition of the Byzantine fleet, the role of foreigners in ensuring movement within and outside the Empire, and the meaning of the sea communication during the Ottoman sieges of Byzantine cities. The author reveals that the Empire could not provide stable and regular sea contacts between separate parts of its territories and external relations with the West on its own. The decline of the fleet and the lack of material resources forced the Byzantines to use foreign ships as means of transportation. The Italians, especially the Venetians, provided transport to the Byzantine emperors and diplomats who made official trips to the West, transported people and goods within the region, and provided food for the inhabitants of besieged cities. It is concluded that the transport dependence of Byzantium on the Italian maritime republics testified to its economic and political weakness. The loss of control over the sea routes in the Eastern Mediterranean and the degradation of its own transport system contributed to the decline and fall of Byzantium in 1453.

scholarly journals Unravelling the key role of surface features behind facet-dependent photocatalysis of anatase TiO2

2019 ◽  
Vol 55 (30) ◽  
pp. 4415-4418 ◽  
Author(s):  
Yung-Kang Peng ◽  
Benedict Keeling ◽  
Yiyang Li ◽  
Jianwei Zheng ◽  
Tianyi Chen ◽  
...  
Keyword(s):  
High Activity ◽  
Anatase Tio2 ◽  
Electronic Effects ◽  
Surface Features

The high activity of the anatase TiO2(001) facet in photocatalytic H2 evolution is due to local electronic effects created by surface F on the facet.

Insight into the role of UV-irradiation in photothermal catalytic Fischer–Tropsch synthesis over TiO2 nanotube-supported cobalt nanoparticles

2018 ◽  
Vol 8 (2) ◽  
pp. 601-610 ◽  
Author(s):  
Limin Wang ◽  
Yichi Zhang ◽  
Xiaojun Gu ◽  
Yulong Zhang ◽  
Haiquan Su
Keyword(s):  
High Activity ◽  
Uv Irradiation ◽  
Catalytic System ◽  
Cobalt Nanoparticles ◽  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Academic Field ◽  
Insight Into

To explore an efficient catalytic system with high activity and selectivity is the key to improve Fischer–Tropsch synthesis (FTS) technology and the main focus in the academic field.

Control of selectivity in allylic alcohol oxidation on gold surfaces: the role of oxygen adatoms and hydroxyl species

2015 ◽  
Vol 17 (6) ◽  
pp. 4730-4738 ◽  
Author(s):  
Gregory M. Mullen ◽  
Liang Zhang ◽  
Edward J. Evans ◽  
Ting Yan ◽  
Graeme Henkelman ◽  
...  
Keyword(s):  
High Activity ◽  
Partial Oxidation ◽  
Gold Catalysts ◽  
Alcohol Oxidation ◽  
Allylic Alcohol ◽  
Gold Surfaces ◽  
Oxygen Adatoms

Gold catalysts display high activity and good selectivity for partial oxidation of a number of alcohol species.

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