Consecutive Reaction Mechanism for the Formation of Spore Photoproduct in DNA Photolesion

2012 ◽  
Vol 116 (36) ◽  
pp. 11117-11123 ◽  
Author(s):  
Qian Du ◽  
Hongmei Zhao ◽  
Di Song ◽  
Kunhui Liu ◽  
Hongmei Su
Keyword(s):  
Reaction Mechanism ◽  
Consecutive Reaction ◽  
Spore Photoproduct

First-order parallel and consecutive reaction mechanisms — Isosbestic points criterium

2008 ◽  
Vol 86 (9) ◽  
pp. 918-924 ◽  
Author(s):  
A E Croce
Keyword(s):  
Reaction Mechanism ◽  
Absorption Spectra ◽  
Rate Coefficients ◽  
Isosbestic Point ◽  
Experimental Conditions ◽  
Consecutive Reaction ◽  
Time Resolved ◽  
First Order ◽  
Kinetic Information ◽  
First Case

A criterium for the selection of reaction mechanism derived from a condition for isosbestic points occurrence is presented. Analytical relationships involving the molar absorption coefficients of the species, which participate in a mechanism of parallel first-order reactions and the corresponding rate coefficients, are also reported. A model system of four species that present overlapping absorption spectra may correspond to the reactant and products of a system of parallel or consecutive first-order reactions. In the first case, under experimental conditions in which the absorbances are additive, the presence of an isosbestic point in the spectrum of the reaction mixture at a given wavelength leads to a time-independent ratio of the degree of advancement of reaction variables. From this, relevant kinetic information may be extracted, namely, the ratio of the reaction rate coefficients. Moreover, the occurrence of isosbestic points allows discarding the second mechanism. This conclusion is independent of the number of absorbing species. Model calculated examples show the application of the equations here derived. The resolution for the general case of mechanisms of N first-order reactions is provided.Key words: chemical kinetics, time-resolved absorption spectra, reaction mechanism.

scholarly journals Correction to Probing the Reaction Mechanism of Spore Photoproduct Lyase (SPL) via Diastereoselectively Labeled Dinucleotide SP TpT Substrates

2012 ◽  
Vol 134 (51) ◽  
pp. 20858-20858 ◽  
Author(s):  
Linlin Yang ◽  
Gengjie Lin ◽  
Degang Liu ◽  
Karl J. Dria ◽  
Joshua Telser ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Spore Photoproduct Lyase ◽  
Spore Photoproduct

scholarly journals Catalytic Oxidation of Benzyl Alcohol to Benzaldehyde on Au8 and Au6Pd2 Clusters: A DFT Study on the Reaction Mechanism

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 720
Author(s):  
Jitlada Kodchasee ◽  
Chanon Chanloi ◽  
Pongtanawat Khemthong ◽  
Boontida Uapipatanakul ◽  
Masahiro Ehara ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Benzyl Alcohol ◽  
Density Functional ◽  
Aerobic Oxidation ◽  
Density Functional Theory Calculations ◽  
Adsorption Complex ◽  
Consecutive Reaction ◽  
Oxidation Of Benzyl Alcohol ◽  
Pd Clusters

Density functional theory calculations were performed to investigate the reaction mechanism of the aerobic oxidation of benzyl alcohol to benzaldehyde catalyzed by Au and Au–Pd clusters. Two consecutive reaction mechanisms were examined with Au8 and Au6Pd2 clusters: (1) the oxidation of benzyl alcohol with dissociated O atoms on metal clusters generating benzaldehyde and H2O; and (2) oxidation with adsorbed oxygen molecules generating benzaldehyde and H2O2. The calculations show that the aerobic oxidation of benzyl alcohol energetically prefers to proceed in the former mechanism, which agrees with the experimental observation. We demonstrate that the role of Au centers around the activation of molecular oxygen to peroxide-like species, which are capable of the H–abstraction of benzyl alcohol. The roles of Pd in the Au6Pd2 cluster are: (1) increasing the electron distribution to neighboring Au atoms, which facilitates the activation of O2; and (2) stabilizing the adsorption complex and transition states by the interaction between positively charged Pd atoms and the π-bond of benzyl alcohol, both of which are the origin of the lower energy barriers than those of Au8.

Fermentpolymerisation VIII

1964 ◽  
Vol 19 (4) ◽  
pp. 287-292 ◽  
Author(s):  
K. H. Ebert ◽  
H. Stricker
Keyword(s):  
Reaction Mechanism ◽  
Active Site ◽  
Equilibrium Constants ◽  
Abnormal Behaviour ◽  
Hypothetical Model ◽  
Acceptor Reaction ◽  
Consecutive Reaction ◽  
Parallel Reactions ◽  
The One ◽  
Temperature Dependance

The temperature dependance of the reaction of levansucrase with sucrose was studied, and the variation of the equilibrium constants of the Michaelis and acceptor reaction, and the maximum velocities for all three parallel reactions (levan formation, inversion and oligosaccharide formation) have been determined. The activation energies of these three reactions were evaluated. The following values were found: oligosaccharide formation 22, inversion 8, levan formation below 24°C 7 and above this temperature 0.7 kcal/Mol. The abnormal behaviour of the levan formation could be interpreted by assuming that different subreactions proceed simultanously, and the one which ends last determines the temperature dependance. More detailed ideas of the nature of these subreactions are presented. This new reaction mechanism must be distinguished from the consecutive reaction mechanism in which different subreactions follow each other. Together with the reaction mechanism as evaluated in an earlier paper, a hypothetical model of the course of the total reaction at the active site of the enzyme has been proposed.

scholarly journals Probing the Reaction Mechanism of Spore Photoproduct Lyase (SPL) via Diastereoselectively Labeled Dinucleotide SP TpT Substrates

2011 ◽  
Vol 133 (27) ◽  
pp. 10434-10447 ◽  
Author(s):  
Linlin Yang ◽  
Gengjie Lin ◽  
Degang Liu ◽  
Karl J. Dria ◽  
Joshua Telser ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Spore Photoproduct Lyase ◽  
Spore Photoproduct

Arylation of enelactams using TIPSOTf: reaction scope and mechanistic insight

2021 ◽  
Author(s):  
Tomasz J. Idzik ◽  
Zofia M. Myk ◽  
Łukasz Struk ◽  
Magdalena Perużyńska ◽  
Gabriela Maciejewska ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Multinuclear Nmr ◽  
Mechanistic Insight ◽  
Nmr Study ◽  
Wide Range

Triisopropylsilyltrifluoromethanesulfonate can be effectively used for the arylation of a wide range of enelactams. The multinuclear NMR study provided deep insights into the reaction mechanism.

Theoretical study of the ketonization reaction mechanism of acetic acid over SiO2

2009 ◽  
Author(s):  
Mendel Fleisher ◽  
E. Lukevics ◽  
L. Leite ◽  
D. Jansone ◽  
K. Edolfa ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Reaction Mechanism ◽  
Theoretical Study

OPTIMIZATION OF A SURROGATE REDUCED AVIATION FUEL-AIR REACTION MECHANISM USING A GENETIC ALGORITHM

Clean Air ◽  
2007 ◽  
Vol 8 (1) ◽  
pp. 1-24
Author(s):  
M. Pourkashanian ◽  
N. S. Mera ◽  
Lionel Elliott ◽  
C. W. Wilson ◽  
Derek B. Ingham ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Reaction Mechanism ◽  
Aviation Fuel
Sign in / Sign up

Export Citation Format

Share Document