Double Exponential Evaluation under Non-Pseudo-First-Order Conditions: A Mixed Second-Order Process Followed by a First-Order Reaction

2017 ◽  
Vol 49 (8) ◽  
pp. 602-610 ◽  
Author(s):  
Virág Kiss ◽  
Katalin Ősz
Keyword(s):  
Order Reaction ◽  
Second Order ◽  
Order Conditions ◽  
First Order Reaction ◽  
Order Process ◽  
First Order ◽  
Double Exponential ◽  
Pseudo First Order ◽  
Second Order Process

On the Chemical Reactivity of the Phytochrome Chromophore in the Pr and Pfr Form

1985 ◽  
Vol 40 (3-4) ◽  
pp. 215-218 ◽  
Author(s):  
Fritz Thümmler ◽  
Peter Eilfeld ◽  
Wolfhart Rüdiger ◽  
Doo-Khil Moon ◽  
Pill-Soon Song
Keyword(s):  
Reaction Kinetics ◽  
Rate Constants ◽  
Chemical Reactivity ◽  
Order Reaction ◽  
First Order Reaction ◽  
Limiting Factor ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Pseudo First Order ◽  
The Difference

The reactivity of the phytochrome chromophore and related tetrapyrroles towards ozone and tetranitromethane was investigated. Both oxidizing reagents cause bleaching of the main absorp­tion band of the pigment. The rate constants for this bleaching were determined under conditions of pseudo first order reaction kinetics. The rate constants for the reaction with ozone are similar for native phytochrome and for freely accessible tetrapyrroles (biliverdin, small chromopeptides from phytochrome) indicating that accessibility is not the limiting factor for the reaction with ozone. Under a variety of conditions, the Pfr chromophore reacts by about 10% faster than the Pr chromophore. This may reflect the true difference in reactivity. The rate constants for the reaction with tetranitromethane are much larger for biliverdin, bilirubin and small chromopeptides from phytochrome than for native phytochrome. The limiting factor for this reaction in native phytochrome therefore is the accessibility of the chromophore by the reagent. Previous conclusions on the difference in exposure of the tetrapyrrole chromophore in Pr and Pfr are confirmed.

Kinetics of Cs adsorption/desorption on granite by a pseudo first order reaction model

2007 ◽  
Vol 275 (3) ◽  
pp. 555-562 ◽  
Author(s):  
Shih-Chin Tsai ◽  
Tsing-Hai Wang ◽  
Yuan-Yaw Wei ◽  
Wen-Chun Yeh ◽  
Yi-Lin Jan ◽  
...  
Keyword(s):  
Reaction Model ◽  
Order Reaction ◽  
First Order Reaction ◽  
Pseudo First Order Reaction ◽  
First Order ◽  
Pseudo First Order ◽  
Adsorption Desorption ◽  
Kinetics Of

scholarly journals Roles of solution concentration and shear rate in the shear-induced crystallization of P3HT

RSC Advances ◽  
2021 ◽  
Vol 11 (32) ◽  
pp. 19673-19681
Author(s):  
Jiaxin He ◽  
Ying Liu ◽  
Fengquan Liu ◽  
Jianjun Zhou ◽  
Hong Huo
Keyword(s):  
Shear Rate ◽  
Crystallization Kinetics ◽  
Solution Concentration ◽  
Order Reaction ◽  
Second Order ◽  
Crystallization Mechanism ◽  
First Order Reaction ◽  
First Order ◽  
Induced Crystallization

The shear temperature and solution concentration determine the FIP content. Increasing FIPs can accelerate the crystallization kinetics and change the crystallization mechanism from a second-order to a first-order reaction.

Sign in / Sign up

Export Citation Format

Share Document