scholarly journals Neptunium(iv)-hydroxamate complexes: their speciation, and kinetics and mechanism of hydrolysis

2019 ◽  
Vol 48 (2) ◽  
pp. 673-687 ◽  
Author(s):  
S. Edwards ◽  
F. Andrieux ◽  
C. Boxall ◽  
M. J. Sarsfield ◽  
R. J. Taylor ◽  
...  

First time determination of rate parameters for hydrolysis of mono- and bis-acetohydroxamatoneptunium(iv) complexes under conditions relevant to nuclear reprocessing.

2002 ◽  
Vol 57 (11-12) ◽  
pp. 1072-1077 ◽  
Author(s):  
Karel Komers ◽  
Alexandr Čegan ◽  
Marek Link

Kinetics and mechanism of hydrolysis of acetylthiocholine by the enzyme butyrylcholine esterase was studied. The spectrophotometric Ellman’s method and potentiometric pH-stat method were used for continuous determination of the actual concentration of the products thiocholine and acetic acid in the reaction mixture. The validity of the Michaelis-Menten (Briggs-Haldane) equation in the whole course of the reaction under used conditions was proved. The corresponding kinetics parameters (Vm and KM) were calculated from the obtained dependences of concentration of thiocholine or acetic acid vs. time and compared. From this comparison the deciding kinetic role of the step producing thiocholine was derived. The values of initial molar concentration of the enzyme and of the rate constants of the kinetic model were estimated.


Horticulturae ◽  
2021 ◽  
Vol 7 (8) ◽  
pp. 206
Author(s):  
Cheng Zhang ◽  
Yue Su ◽  
Yanyou Wu ◽  
Haitao Li ◽  
Ying Zhou ◽  
...  

The nutrient metabolism, growth and development of plants are strongly affected by its nutrient plunder, and plants have different adaptive mechanisms to low-nutrient environments. The electrophysiological activities involve almost all life processes of plants. In this study, the active transport flow of nutrient (NAF) and nutrient plunder capacity (NPC) of plants were defined based on leaf intrinsic impedance (IZ), capacitive reactance (IXc), inductive reactance (IXL) and capacitance (IC) to evaluate the nutrient plunder capacity of plants for the first time. The results indicate that Orychophragmus violaceus had higher (p < 0.01) NPC and IC and lower (p < 0.01) IR, IXc, IXL and IZ as compared to Brassica napus L., which supports a superior ion affinity and that it could be better adapted to low-nutrient environments. UAF and NPC of plants exhibited good correlations with crude protein, crude ash and water content, and precisely revealed the plunder capacity and adaptive strategies of plants to nutrients. The present work highlights that O. violaceus had superior NPC and ion affinity compared with B. napus, and provided a novel, rapid, reliable method based on the plant’s electrophysiological information for real-time determination of the nutrient plunder capacity of plants.


1966 ◽  
Vol 5 (11) ◽  
pp. 1943-1946 ◽  
Author(s):  
Franklin H. Fry ◽  
Gordon A. Hamilton ◽  
John Turkevich

1982 ◽  
Vol 13 (4) ◽  
Author(s):  
S. J. PLUST ◽  
J. R. LOEHE ◽  
F. J. FEHER ◽  
J. H. BENEDICT ◽  
H. F. HERBRANDSON

1984 ◽  
Vol 15 (42) ◽  
Author(s):  
M. M. AL SABBAGH ◽  
M. CALMON ◽  
J.-P. CALMON

Author(s):  
Mohamed Mowafak Al Sabbagh ◽  
Michelle Calmon ◽  
Jean-Pierre Calmon

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