Study of Briggs Rauscher Oscillatory Reaction in Aqueous Acetonitrile Mixed Medium

1994 ◽  
Vol 59 (7) ◽  
pp. 1596-1605
Author(s):  
Punchayil V. Lalitha ◽  
Natesan Balasubramanian ◽  
Ranganathan Ramaswamy
Keyword(s):  
Mixed Media ◽  
Oscillatory Reaction ◽  
Oscillatory Behaviour ◽  
Cyanoacetic Acid ◽  
Aqueous Acetonitrile ◽  
Mixed Medium ◽  
Acetonitrile Concentration

The oscillatory behaviour of two new substrates namely, 2-thenoyltrifluoroacetone and cyanoacetic acid in the Briggs Rauscher (B-R) system was studied in detail employing a mixed medium: aqueous acetonitrile. The effect of acetonitrile concentration on the oscillatory behaviour is investigated. It is found that employing the aqueous organic mixed media is highly beneficial in the oscillatory study, enabling the study of water-insoluble substances.

A Novel Approach to the Study of Briggs-Rauscher Reaction

1992 ◽  
Vol 57 (11) ◽  
pp. 2235-2240 ◽  
Author(s):  
Punchayil Velayudhan Nair Lalitha ◽  
Renganathan Ramaswamy
Keyword(s):  
Organic Solvent ◽  
Malonic Acid ◽  
Mixed Media ◽  
Oscillatory Behaviour ◽  
Present Communication ◽  
Oscillatory Systems ◽  
Novel Approach ◽  
Mixed Medium ◽  
Acidic Hydrogen

The Briggs-Rauscher reaction with substrates containing acidic hydrogen such as malonic acid, acetonyl acetone has been studied. The employment of mixed media involving an organic solvent and water enabled the study of water-insoluble substrates. The present communication reports the oscillatory behaviour of malonic acid in the iodate system in different mixed media (5 vol.% of the organic solvent) as well as the oscillatory behaviour of seven substrates in acetonitrile-water mixed medium of which two are new substrates hitherto unreported in any of the oscillatory systems.

scholarly journals Catalyst Initiation in the Oscillatory Carbonylation Reaction

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Katarina Novakovic ◽  
Julie Parker
Keyword(s):  
Carbon Monoxide ◽  
Chemical Reactions ◽  
Potassium Iodide ◽  
Significant Role ◽  
Reaction Network ◽  
Oxidative Carbonylation ◽  
Heat Of Reaction ◽  
Oscillatory Reaction ◽  
Oscillatory Behaviour ◽  
Carbonylation Reaction

Palladium(II) iodide is used as a catalyst in the phenylacetylene oxidative carbonylation reaction that has demonstrated oscillatory behaviour in both pH and heat of reaction. In an attempt to extract the reaction network responsible for the oscillatory nature of this reaction, the system was divided into smaller parts and they were studied. This paper focuses on understanding the reaction network responsible for the initial reactions of palladium(II) iodide within this oscillatory reaction. The species researched include methanol, palladium(II) iodide, potassium iodide, and carbon monoxide. Several chemical reactions were considered and applied in a modelling study. The study revealed the significant role played by traces of water contained in the standard HPLC grade methanol used.

scholarly journals Mineralization and nutrient release pattern of vermicast-sawdust mixed media with or without addition of Trichoderma viride

PLoS ONE ◽  
2021 ◽  
Vol 16 (7) ◽  
pp. e0254188
Author(s):  
Suwen Lin ◽  
Lokanadha Rao Gunupuru ◽  
Raphael Ofoe ◽  
Roksana Saleh ◽  
Samuel Kwaku Asiedu ◽  
...  
Keyword(s):  
Repeated Measures ◽  
Strong Association ◽  
Trichoderma Viride ◽  
Nutrient Release ◽  
Mixed Media ◽  
Total Dissolved Solids ◽  
Dissolved Solids ◽  
Nutrient Mineralization ◽  
Microbial Inoculation ◽  
Mixed Medium

A combination of vermicast and sawdust mixed medium is commonly used in horticulture, but the added benefit of microbial inoculation and mechanism of nutrient availability are unknown. This study was done to determine nutrient mineralization and nutrient release patterns of different combinations or a mix of vermicast-sawdust growing media amended with or without Trichoderma viride (105 spores/g). The mixed-media treatments were (1) 80% vermicast+20% sawdust; (2) 60% vermicast+40% sawdust; (3) 40% vermicast+60% sawdust; (4) 20% vermicast+80% sawdust; and (5) sawdust alone (control). Total dissolved solids, electric conductivity and salinity increased with each sampling time following submergence in deionized. Nutrients released from media without T. viride were significantly higher than the corresponding media with added T. viride. Overall, the starting total nitrogen of the different media did not change during the incubation period, but nitrate-nitrogen was reduced to a negligible amount by the end of day 30 of incubation. A repeated measures analysis showed a significant effect of Time*T. viride*Treatment on total dissolved solids. Redundancy analysis demonstrated a positive and strong association between media composed of ≥40% vermicast and ≤60% sawdust with or without T. viride and mineral nutrients released, electrical conductivity, total dissolved solids and salinity. These findings suggest that fast-growing plants may benefit from 40% to 60% vermicast added to 40% to 60% sawdust without T. viride while slow-growing plants can benefit from the same mixed medium combined with the addition of T. viride. Further investigation is underway to assess microbial dynamics in the mixed media and their influence on plant growth.

The oscillatory Belousov–Zhabotinsky reaction with flavones in batch systems using aqueous–DMF mixed medium

1994 ◽  
Vol 72 (6) ◽  
pp. 1537-1540 ◽  
Author(s):  
G. Maya ◽  
P.V. Lalitha ◽  
R. Ramaswamy
Keyword(s):  
Aqueous Medium ◽  
Aqueous System ◽  
Water Soluble ◽  
Oscillatory Behaviour ◽  
Oscillatory Systems ◽  
Batch Systems ◽  
Mixed Medium ◽  
First Time ◽  
Belousov Zhabotinsky Reaction ◽  
Soluble Substrate

Oscillatory systems of the Belousov–Zhabotinsky type with flavones as substrates are described for the first time. Since quercetin and morin are water insoluble, a mixed medium containing DMF and water was used with one of the three catalysts Ce(III), ferroin, or Mn(II). The oscillatory behaviour of a water-soluble substrate (gallic acid) was studied in nine different aqueous–organic mixed media as well as in pure aqueous medium in the bromate–Ce(III) system. The results obtained from a catalyzed system with quercetin or morin as the substrate in an aqueous–organic mixed medium are in agreement with the accepted (FKN) mechanism for an aqueous system.

Oscillatory Reaction of Bromate-Gallic acid. A Calorimetric and Electrometric Study in Aquo-Organic Solvent Media

2001 ◽  
Vol 215 (5) ◽  
Author(s):  
S. Biswas ◽  
K. Mukherjee ◽  
S.N. Basu ◽  
D.C. Mukherjee ◽  
S.P. Moulik
Keyword(s):  
Gallic Acid ◽  
Solvent Polarity ◽  
Chloride Ion ◽  
Dimethyl Formamide ◽  
Oscillatory Process ◽  
Oscillatory Reaction ◽  
Oscillatory Behaviour ◽  
Organic Solvent Media ◽  
Electrometric Study ◽  
Condition Indicator

The oscillatory reaction between potassium bromate and gallic acid (in presence of sulfuric acid and ferroin indicator) has been calorimetrically and potentiometrically studied in binary mixtures of water and organic solvents viz. dimethyl formamide, acetonitrile, tetrahydrofuran and 1,4-dioxan. The effects of solvent polarity, stirring condition, indicator concentration, aerial oxygen and chloride ion on the oscillatory process have been examined. The oscillatory behaviour of the reaction probed by the potentiometric method has a general agreement with the calorimetric method. An attempt has been made to determine the order of the Fe

Rewriting the Narrative

2019 ◽  
Vol 96 (4) ◽  
pp. 54-77
Author(s):  
Nicolas G. Rosenthal
Keyword(s):  
Twentieth Century ◽  
Native American ◽  
American Indian ◽  
Modern Society ◽  
Mixed Media ◽  
The State ◽  
Historical Narratives ◽  
Recent Scholarship ◽  
Art Scene ◽  
The 1960S

A vibrant American Indian art scene developed in California from the 1960s to the 1980s, with links to a broader indigenous arts movement. Native American artists working in the state produced and exhibited paintings, prints, sculptures, mixed media, and other art forms that validated and documented their cultures, interpreted their history, asserted their survival, and explored their experiences in modern society. Building on recent scholarship that examines American Indian migration, urbanization, and activism in the twentieth century, this article charts these developments and argues that American Indian artists in California challenged and rewrote dominant historical narratives by foregrounding Native American perspectives in their work.

Synthesis of Some New Tetracyclic Pyrimidine Derivatives Using Exocyclic α,β-Unsaturated Ketone and Evaluation of Their Antitumor Activities

2016 ◽  
Vol 12 (8) ◽  
pp. 311-317
Author(s):  
Kamelia El-Mahdy
Keyword(s):  
Antitumor Activity ◽  
Spectroscopic Data ◽  
Acid Hydrazide ◽  
Chloroacetic Acid ◽  
Equimolar Amount ◽  
Unsaturated Ketone ◽  
Cyanoacetic Acid ◽  
Antitumor Activities ◽  
Pyrimidine Derivatives ◽  
Cyanoacetic Acid Hydrazide

Thiazolopyrimidine 2 was obtained from the reaction of dihydropyrimidinone with chloroacetic acid and benzaldehyde. Thiazolopyrimidine 2 containing an α,β-unsaturated ketonic function [-CH=CH-CO-] has been used as a component of Michael addition with an equimolar amount of dinucleophiles to give a series of novel tetracyclic pyrimidine derivatives. Treatment of thiazolopyrimidine 2 with uracil, aminotriazole, cyanoacetic acid hydrazide, o-phenylenediamine or diaminopyridine afforded the corresponding pyridopyrimidine, triazolopyrimidine, pyrazolone, benzodiazepine and triazepine derivative, respectively. The detailed synthesis, spectroscopic data, and antitumor activity for synthesized compounds were reported.

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