Mineralization of aqueous Perfluorooctanesulfonate (PFOS) using homogeneous catalytic process

2019 ◽  
Author(s):  
◽  
Perrine Chapelle
Keyword(s):  
Catalytic Process ◽  
Homogeneous Catalytic Process

Synthesis and Size-Selective Catalysis by Supported Gold Nanoparticles:  Study on Heterogeneous and Homogeneous Catalytic Process

2007 ◽  
Vol 111 (12) ◽  
pp. 4596-4605 ◽  
Author(s):  
Sudipa Panigrahi ◽  
Soumen Basu ◽  
Snigdhamayee Praharaj ◽  
Surojit Pande ◽  
Subhra Jana ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Catalytic Process ◽  
Selective Catalysis ◽  
Supported Gold Nanoparticles ◽  
Supported Gold ◽  
Homogeneous Catalytic Process

Crystal structures of Magnaporthe oryzae trehalose-6-phosphate synthase (MoTps1) suggest a model for catalytic process of Tps1

2019 ◽  
Vol 476 (21) ◽  
pp. 3227-3240 ◽  
Author(s):  
Shanshan Wang ◽  
Yanxiang Zhao ◽  
Long Yi ◽  
Minghe Shen ◽  
Chao Wang ◽  
...  
Keyword(s):  
Crystal Structures ◽  
Conformational Changes ◽  
Magnaporthe Oryzae ◽  
Structural Information ◽  
Complex Structure ◽  
Critical Role ◽  
Catalytic Process ◽  
Structural Basis ◽  
Salt Bridges ◽  
Terminal Domain

Trehalose-6-phosphate (T6P) synthase (Tps1) catalyzes the formation of T6P from UDP-glucose (UDPG) (or GDPG, etc.) and glucose-6-phosphate (G6P), and structural basis of this process has not been well studied. MoTps1 (Magnaporthe oryzae Tps1) plays a critical role in carbon and nitrogen metabolism, but its structural information is unknown. Here we present the crystal structures of MoTps1 apo, binary (with UDPG) and ternary (with UDPG/G6P or UDP/T6P) complexes. MoTps1 consists of two modified Rossmann-fold domains and a catalytic center in-between. Unlike Escherichia coli OtsA (EcOtsA, the Tps1 of E. coli), MoTps1 exists as a mixture of monomer, dimer, and oligomer in solution. Inter-chain salt bridges, which are not fully conserved in EcOtsA, play primary roles in MoTps1 oligomerization. Binding of UDPG by MoTps1 C-terminal domain modifies the substrate pocket of MoTps1. In the MoTps1 ternary complex structure, UDP and T6P, the products of UDPG and G6P, are detected, and substantial conformational rearrangements of N-terminal domain, including structural reshuffling (β3–β4 loop to α0 helix) and movement of a ‘shift region' towards the catalytic centre, are observed. These conformational changes render MoTps1 to a ‘closed' state compared with its ‘open' state in apo or UDPG complex structures. By solving the EcOtsA apo structure, we confirmed that similar ligand binding induced conformational changes also exist in EcOtsA, although no structural reshuffling involved. Based on our research and previous studies, we present a model for the catalytic process of Tps1. Our research provides novel information on MoTps1, Tps1 family, and structure-based antifungal drug design.

Triggering photocatalytic activity of carbon dot-based nanocomposites by self-supplying peroxide

2021 ◽  
Author(s):  
Tingting Cai ◽  
Qing Chang ◽  
Bin Liu ◽  
Caihong Hao ◽  
Jinlong Yang ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Electric Field ◽  
Catalytic Process ◽  
Charge Accumulation ◽  
Carbon Dot ◽  
Carrier Transfer ◽  
Polarization Electric Field

The photocatalyst performance highly relies on the quantity of carrier transfer from the bulk to surface during the catalytic process. However, the polarization electric field induced by charge accumulation at...

Treating crude oil storage tank sludge by catalytic process and recovering valuable hydrocarbons

2021 ◽  
Author(s):  
Kamalesh Gupta ◽  
Arun Kumar Jana ◽  
Mousumi Chakraborty ◽  
Parimal A. Parikh
Keyword(s):  
Crude Oil ◽  
Storage Tank ◽  
Catalytic Process ◽  
Oil Storage ◽  
Oil Storage Tank

scholarly journals Gold(I)-catalyzed synthesis of γ-vinylbutyrolactones by intramolecular oxaallylic alkylation with alcohols

2011 ◽  
Vol 7 ◽  
pp. 1198-1204 ◽  
Author(s):  
Michel Chiarucci ◽  
Mirko Locritani ◽  
Gianpiero Cera ◽  
Marco Bandini
Keyword(s):  
Catalytic System ◽  
Functional Group ◽  
Direct Synthesis ◽  
Catalytic Process ◽  
Primary Alcohols

Gold(I)-N-heterocyclic carbene (NHC) complexes proved to be a reliable catalytic system for the direct synthesis of functionalized γ-vinylbutyrolactones by intramolecular oxaallylic alkylation with primary alcohols. Good isolated chemical yields were obtained for a range of malonyl and acetate derivatives. The good performance in reagent-grade solvents and the functional group/moisture tolerance make this catalytic process a promising route for the synthesis of architecturally complex polycyclic structures.

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