scholarly journals From “S” to “O”: experimental and theoretical insights into the atmospheric degradation mechanism of dithiophosphinic acids

RSC Advances ◽  
2020 ◽  
Vol 10 (66) ◽  
pp. 40035-40042 ◽  
Author(s):  
Zhipeng Wang ◽  
Yixiang Zhang ◽  
Jingjing Liu ◽  
Lianjun Song ◽  
Xueyu Wang ◽  
...  
Keyword(s):  
Oxidation Behavior ◽  
Degradation Mechanism ◽  
Theoretical Methods ◽  
Atmospheric Degradation ◽  
Dithiophosphinic Acids

The oxidation behavior and mechanism of five typical DPAH ligands in the air was systematically studied through experimental and theoretical methods.

Atmospheric Degradation Mechanism of CF3OCH3

1999 ◽  
Vol 103 (21) ◽  
pp. 4202-4208 ◽  
Author(s):  
L. K. Christensen ◽  
T. J. Wallington ◽  
A. Guschin ◽  
M. D. Hurley
Keyword(s):  
Degradation Mechanism ◽  
Atmospheric Degradation

Atmospheric degradation mechanism of CF3OCF2H

2001 ◽  
Vol 343 (3-4) ◽  
pp. 296-302 ◽  
Author(s):  
Y. Inoue ◽  
M. Kawasaki ◽  
T.J. Wallington ◽  
M.D. Hurley
Keyword(s):  
Degradation Mechanism ◽  
Atmospheric Degradation

Oxidation of MoSi2/SiC nanolayered composite

1998 ◽  
Vol 13 (4) ◽  
pp. 965-973 ◽  
Author(s):  
J-P. Hirvonen ◽  
P. Torri ◽  
R. Lappalainen ◽  
J. Likonen ◽  
H. Kung ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Composite Material ◽  
Steady State ◽  
Oxidation Rate ◽  
Oxidation Behavior ◽  
Secondary Ion Mass Spectrometry ◽  
Degradation Mechanism ◽  
Low Carbon Steel ◽  
Low Carbon ◽  
Initial Oxidation

The oxidation behavior of a nanolayered MoSi2/SiC composite material was determined at the temperature range of 400–900 °C in wet oxidation conditions. The samples were produced in the form of thin films using a sputtering technique from two different sources, and a rotating substrate holder, onto silicon single crystals and low carbon steel. For comparison, the oxidations of both constituents, MoSi2 and SiC, produced with the same sputtering technique, were measured separately. The microstructure of the MoSi2/SiC samples was determined with high resolution transmission electron microscopy (HRTEM), and the composition of the sputtered samples was measured using backscattering (BS) of protons. For quantitative determination of oxidation, the nuclear reaction 16O(d, p)17O was utilized. Oxide layers were also analyzed using a secondary ion mass spectrometry (SIMS) and the appearance of the oxidized surface with a scanning electron microscopy (SEM). As expected, the SiC films had both the lowest initial oxidation and steady state oxidation rate. The results show that the oxidation behavior of the MoSi2/SiC nanolayered composite material differs from that of both its constituents and involves a degradation mechanism of its own, resulting in the highest oxidation during the initial phase of the oxidation. A steady-state oxidation rate was observed after the initial transient phase to be the highest for the metastable C40 structure of the single MoSi2 layer. The oxidation rate of the nanolayered structure was retarded by the SiC layers. No signs of pest disintegration were observed on either of the MoSi2 containing coatings during the steady-state phase of the oxidation at 500 °C up to 40 h. Our results show that the oxidation of nanolayered structures can be only in part explained by the oxidation behavior of the constituents and that during the steady-state oxidation of the nanolayered structure the oxidation rate is largely determined by the constituent with the lowest oxidation rate and by the layered structure.

scholarly journals Detailed modeling of the atmospheric degradation mechanism of very-short lived brominated species

2012 ◽  
Vol 59 ◽  
pp. 514-532 ◽  
Author(s):  
G. Krysztofiak ◽  
V. Catoire ◽  
G. Poulet ◽  
V. Marécal ◽  
M. Pirre ◽  
...  
Keyword(s):  
Degradation Mechanism ◽  
Atmospheric Degradation

Atmospheric degradation mechanism of benzyl peroxy radical: A theoretical study

2019 ◽  
Vol 201 ◽  
pp. 18-27 ◽  
Author(s):  
Bo Feng ◽  
Cuihong Sun ◽  
Shaowen Zhang
Keyword(s):  
Theoretical Study ◽  
Degradation Mechanism ◽  
Peroxy Radical ◽  
Atmospheric Degradation

scholarly journals Theoretical study on the atmospheric degradation mechanism and subsequent products of E,E‐2,4‐hexadienal with hydroxyl radical

2020 ◽  
Author(s):  
Yanan Sun ◽  
Junfang Yao ◽  
Yizhen Tang ◽  
Yunju Zhang ◽  
Wenzhong Wu ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Theoretical Study ◽  
Degradation Mechanism ◽  
Atmospheric Degradation

scholarly journals Theoretical study on the atmospheric degradation mechanism and subsequent products of E,E-2,4-hexadienal with hydroxyl radical

2020 ◽  
Author(s):  
Yanan Sun ◽  
Junfang Yao ◽  
Yizhen Tang ◽  
yunju zhang ◽  
Wenzhong Wu ◽  
...  
Keyword(s):  
Hydroxyl Radical ◽  
Theoretical Study ◽  
Degradation Mechanism ◽  
Atmospheric Degradation

Structures of c-di-GMP/cGAMP degrading phosphodiesterase VcEAL: identification of a novel conformational switch and its implication

2019 ◽  
Vol 476 (21) ◽  
pp. 3333-3353 ◽  
Author(s):  
Malti Yadav ◽  
Kamalendu Pal ◽  
Udayaditya Sen
Keyword(s):  
Active Site ◽  
Metal Binding ◽  
Metal Ion ◽  
Triosephosphate Isomerase ◽  
Catalytic Mechanism ◽  
Degradation Mechanism ◽  
Structural Basis ◽  
Conserved Residues ◽  
Phosphodiester Bond ◽  
Cyclic Dinucleotides

Cyclic dinucleotides (CDNs) have emerged as the central molecules that aid bacteria to adapt and thrive in changing environmental conditions. Therefore, tight regulation of intracellular CDN concentration by counteracting the action of dinucleotide cyclases and phosphodiesterases (PDEs) is critical. Here, we demonstrate that a putative stand-alone EAL domain PDE from Vibrio cholerae (VcEAL) is capable to degrade both the second messenger c-di-GMP and hybrid 3′3′-cyclic GMP–AMP (cGAMP). To unveil their degradation mechanism, we have determined high-resolution crystal structures of VcEAL with Ca2+, c-di-GMP-Ca2+, 5′-pGpG-Ca2+ and cGAMP-Ca2+, the latter provides the first structural basis of cGAMP hydrolysis. Structural studies reveal a typical triosephosphate isomerase barrel-fold with substrate c-di-GMP/cGAMP bound in an extended conformation. Highly conserved residues specifically bind the guanine base of c-di-GMP/cGAMP in the G2 site while the semi-conserved nature of residues at the G1 site could act as a specificity determinant. Two metal ions, co-ordinated with six stubbornly conserved residues and two non-bridging scissile phosphate oxygens of c-di-GMP/cGAMP, activate a water molecule for an in-line attack on the phosphodiester bond, supporting two-metal ion-based catalytic mechanism. PDE activity and biofilm assays of several prudently designed mutants collectively demonstrate that VcEAL active site is charge and size optimized. Intriguingly, in VcEAL-5′-pGpG-Ca2+ structure, β5–α5 loop adopts a novel conformation that along with conserved E131 creates a new metal-binding site. This novel conformation along with several subtle changes in the active site designate VcEAL-5′-pGpG-Ca2+ structure quite different from other 5′-pGpG bound structures reported earlier.

Characterization of Microstructure, Hardness and Oxidation Behavior of Carbon Steels Hot Dipped in Al and Al–1 at% Si Molten Baths

2012 ◽  
Vol 50 (8) ◽  
pp. 575-582 ◽  
Author(s):  
Dong Bok Lee ◽  
Trinh Wan Trung ◽  
Sun Kyu Kim ◽  
Min Jung Kim ◽  
Seul Ki Kim ◽  
...  
Keyword(s):  
Oxidation Behavior ◽  
Carbon Steels
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