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

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 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

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.

Stochastic Models of Particle Trajectories in Turbulent Atmosphere Flows by Using the LANGEVIN Equations

Proceedings ◽  
2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Youssra El Qasemy ◽  
Abdelfatah Achahbar ◽  
Abdellatif Khamlichi
Keyword(s):  
Wind Speed ◽  
Wind Turbine ◽  
Classical Method ◽  
Degradation Mechanism ◽  
Transformation Process ◽  
Langevin Equations ◽  
Turbulence Data ◽  
Power Curves ◽  
And Diffusion ◽  
Fluctuating Wind

The stochastic behavior of wind speed is a particular characteristic of wind energy production, which affects the degradation mechanism of the turbine, resulting in stochastic charging on the wind turbine. A model stochastic is used in this study to evaluate the efficiency of wind turbine power of whatever degree given fluctuating wind turbulence data. This model is based on the Langevin equations, which characterize, by two coefficients, drift and diffusion functions. These coefficients describe the behavior of the transformation process from the input wind speed to the output data that need to be determined. For this present work, the computation of drift and diffusion functions has been carried out by using the stochastic model to assess the output variables in terms of the torque and power curves as a function of time, and it is compared by the classical method. The results show that the model stochastic can define the efficiency of wind turbine generation more precisely.

Synthesis, Characterization and Thermal Degradation of Some New 3,5-dimethyl Pyrazole Derivatives

2017 ◽  
Vol 68 (2) ◽  
pp. 317-322
Author(s):  
Anca Mihaela Mocanu ◽  
Constantin Luca ◽  
Alina Costina Luca
Keyword(s):  
Thermal Degradation ◽  
Degradation Mechanism ◽  
New Products ◽  
Analysis Data ◽  
Biological Properties ◽  
Elemental Analysis Data ◽  
Ftir Analysis ◽  
Spectral Measurements ◽  
Chemical Structures ◽  
And Storage

The purpose of this research is to synthetize, characterize and thermal degradation of new heterolytic derivates with potential biological properties. The derivates synthesis was done by obtaining new molecules with pyralozone structure which combine two pharmacophore entities: the amidosulfonyl-R1,R2 phenoxyacetil with the 3,5-dimethyl pyrazole which can have potential biological properties. The synthesis stages of the new products are presented as well as the elemental analysis data and IR, 1H-NMR spectral measurements made for elucidating the chemical structures and thermostability study which makes evident the temperature range proper for their use and storage. The obtained results were indicative of a good correlation of the structure with the thermal stability as estimated by means of the initial degradation temperatures as well as with the degradation mechanism by means of the TG-FTIR analysis.

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