Influence of Copper Ion Concentration on the Kinetics of Formation of a Protective Layer on Copper in an Acidic CMP Solution Containing BTA and Glycine

2013 ◽  
Vol 160 (10) ◽  
pp. H653-H658 ◽  
Author(s):  
Seungchoun Choi ◽  
David A. Dornfeld ◽  
Fiona M. Doyle
Keyword(s):  
Copper Ion ◽  
Protective Layer ◽  
Ion Concentration ◽  
Kinetics Of Formation ◽  
Kinetics Of

Kinetics of cyclization of S-ethoxycarbonylmethylisothiouronium chloride to 2-imino-4-thiazolidone

1979 ◽  
Vol 44 (3) ◽  
pp. 912-917 ◽  
Author(s):  
Vladimír Macháček ◽  
Said A. El-bahai ◽  
Vojeslav Štěrba
Keyword(s):  
Hydrochloric Acid ◽  
Dilute Hydrochloric Acid ◽  
Base Catalysis ◽  
General Base ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Rate Limiting ◽  
Kinetics Of

Kinetics of formation of 2-imino-4-thiazolidone from S-ethoxycarbonylmethylisothiouronium chloride has been studied in aqueous buffers and dilute hydrochloric acid. The reaction is subject to general base catalysis, the β value being 0.65. Its rate limiting step consists in acid-catalyzed splitting off of ethoxide ion from dipolar tetrahedral intermediate. At pH < 2 formation of this intermediate becomes rate-limiting; rate constant of its formation is 2 . 104 s-1.

Cyclization and acid-catalyzed hydrolysis of O-benzoylbenzamidoximes

1986 ◽  
Vol 51 (12) ◽  
pp. 2786-2797
Author(s):  
František Grambal ◽  
Jan Lasovský
Keyword(s):  
Reaction Rate ◽  
Kinetic Isotope ◽  
Acid Base Equilibrium ◽  
Mineral Acids ◽  
Kinetics Of Formation ◽  
Acid Catalyzed ◽  
Ph Scale ◽  
Kinetics Of ◽  
Hydrolysis Of ◽  
Derivatives Of

Kinetics of formation of 1,2,4-oxadiazoles from 24 substitution derivatives of O-benzoylbenzamidoxime have been studied in sulphuric acid and aqueous ethanol media. It has been found that this medium requires introduction of the Hammett H0 function instead of the pH scale beginning as low as from 0.1% solutions of mineral acids. Effects of the acid concentration, ionic strength, and temperature on the reaction rate and on the kinetic isotope effect have been followed. From these dependences and from polar effects of substituents it was concluded that along with the cyclization to 1,2,4-oxadiazoles there proceeds hydrolysis to benzamidoxime and benzoic acid. The reaction is thermodynamically controlled by the acid-base equilibrium of the O-benzylated benzamidoximes.

scholarly journals Commonalities between Copper Neurotoxicity and Alzheimer’s Disease

Toxics ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 4
Author(s):  
Roshni Patel ◽  
Michael Aschner
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Structural Changes ◽  
Copper Ion ◽  
Plaque Formation ◽  
Ion Concentration ◽  
Medical Community ◽  
Disease Etiology ◽  
Parent Protein ◽  
Lead Zinc

Alzheimer’s disease, a highly prevalent form of dementia, targets neuron function beginning from the hippocampal region and expanding outwards. Alzheimer’s disease is caused by elevated levels of heavy metals, such as lead, zinc, and copper. Copper is found in many areas of daily life, raising a concern as to how this metal and Alzheimer’s disease are related. Previous studies have not identified the common pathways between excess copper and Alzheimer’s disease etiology. Our review corroborates that both copper and Alzheimer’s disease target the hippocampus, cerebral cortex, cerebellum, and brainstem, affecting motor skills and critical thinking. Additionally, Aβ plaque formation was analyzed beginning from synthesis at the APP parent protein site until Aβ plaque formation was completed. Structural changes were also noted. Further analysis revealed a relationship between amyloid-beta plaques and copper ion concentration. As copper ion levels increased, it bound to the Aβ monomer, expediting the plaque formation process, and furthering neurodegeneration. These conclusions can be utilized in the medical community to further research on the etiology of Alzheimer’s disease and its relationships to copper and other metal-induced neurotoxicity.

Effect of CTABr (surfactant) on the kinetics of formation of silver nanoparticles by Amla extract

2021 ◽  
Vol 329 ◽  
pp. 115537
Author(s):  
Nazia Iqbal ◽  
S.M. Shakeel Iqubal ◽  
Aejaz Abdullatif Khan ◽  
Tasneem Mohammed ◽  
Ali Mohamed Alshabi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Kinetics Of Formation ◽  
Kinetics Of

Kinetics of formation and dissociation of triaza-crown-alkanoic acid complexes of cerium(III) and europium(III)

Polyhedron ◽  
1995 ◽  
Vol 14 (10) ◽  
pp. 1299-1306 ◽  
Author(s):  
Ki-Young Choi ◽  
Dong Won Kim ◽  
Choon Pyo Hong
Keyword(s):  
Alkanoic Acid ◽  
Kinetics Of Formation ◽  
Kinetics Of

Automated Fluoride Ion Determination

1977 ◽  
Vol 14 (1-6) ◽  
pp. 269-274 ◽  
Author(s):  
David C. Cowell
Keyword(s):  
Continuous Flow ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Selective Electrode ◽  
Automated Method ◽  
Electrode Response ◽  
Kinetics Of ◽  
Fluoride Ion Selective Electrode ◽  
Flow Techniques

An automated method is described, using standard continuous flow techniques, for the determination of urine fluoride ion concentration using a fluoride ion selective electrode. It is shown that the kinetics of the electrode response to changes in fluoride ion can be used for the accurate measurement of fluoride ion concentration in urine, and that equilibration of the electrode response is not a prerequisite for the measurement of fluoride ion. Recovery experiments are in the range 83 to 90%; in-batch precision is between 0·9 and 1·6% and carryover 2·5% or less.

The kinetics of formation of resveratrol-β-cyclodextrin-NH2 and resveratrol analog-β-cyclodextrin-NH2 supramolecular complexes

2021 ◽  
pp. 130612
Author(s):  
Eliara Acipreste Hudson ◽  
Hauster Maximiler Campos de Paula ◽  
Yara Luiza Coelho ◽  
Nícolas Glanzmann ◽  
Adilson David da Silva ◽  
...  
Keyword(s):  
Supramolecular Complexes ◽  
Kinetics Of Formation ◽  
Kinetics Of

Kinetics of the Variation in the Magnetic Impurity Ion Concentration in Pb1–x–ySn x V y Te Alloys upon Doping

2018 ◽  
Vol 52 (7) ◽  
pp. 828-835
Author(s):  
E. P. Skipetrov ◽  
N. S. Konstantinov ◽  
L. A. Skipetrova ◽  
A. V. Knotko ◽  
V. E. Slynko
Keyword(s):  
Magnetic Impurity ◽  
Ion Concentration ◽  
Impurity Ion ◽  
Kinetics Of

Kinetics of Formation and Dissociation of Lanthanide(III)-DOTA Complexes

1994 ◽  
Vol 33 (18) ◽  
pp. 4070-4076 ◽  
Author(s):  
Eva Toth ◽  
Erno Brucher ◽  
Istvan Lazar ◽  
Imre Toth
Keyword(s):  
Kinetics Of Formation ◽  
Kinetics Of
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