Reply to the Comments by L'. Adamčiková, Z. Farbulová and P. Ševčik on “Belousov−Zhabotinsky Oscillations in Bromate−Oxalic Acid−MnSO4−H2SO4−Acetone System in Nonionic Surfactant Medium. A Calorimetric Study”.

2002 ◽  
Vol 106 (30) ◽  
pp. 7081-7081
Author(s):  
Sudeshna Biswas ◽  
Kallol Mukherjee ◽  
Dulal Chandra Mukherjee ◽  
Satya Priya Moulik
Keyword(s):  
Oxalic Acid ◽  
Nonionic Surfactant ◽  
Calorimetric Study ◽  
Acetone System

Thermal oscillations in the bromate – oxalic acid – MnSO4 – H2SO4 – acetone system: A calorimetric study

2002 ◽  
Vol 80 (9) ◽  
pp. 1204-1209
Author(s):  
Sudeshna Biswas ◽  
Kallol Mukherjee ◽  
Dulal Chandra Mukherjee ◽  
Satya Priya Moulik
Keyword(s):  
Oxalic Acid ◽  
Enthalpy Change ◽  
Potassium Bromate ◽  
Calorimetric Study ◽  
Oscillatory Reaction ◽  
System A ◽  
Retarding Effect ◽  
Thermal Oscillations ◽  
Belousov Zhabotinsky Reaction ◽  
Acetone System

The oscillatory reaction of potassium bromate, oxalic acid, and MnSO4 in the presence of acetone in aq H2SO4 solutions has been studied calorimetrically at different concentrations of substrates. Acetone and oxalic acid have been found to accelerate the reaction by increasing the oscillation frequency. On the other hand, MnSO4 has a retarding effect; the frequency of oscillation decreases systematically with increasing concentration of MnSO4. Potassium bromate shows mixed behavior in this respect. The total heat evolved during the reaction per mol of oxalic acid consumed has been evaluated, which can be used to calculate the concentrations of the various reactants at different stages of the reaction. The effects of different electrolytes (KCl, NaCl, BaCl2, CaCl2, SrCl2, NaBr, NaI, KNO3, NaNO3, and Ca(NO3)2) and solvents (dimethylformamide, 1,4-dioxane, acetonitrile, and tetrahydrofuran) on the extents of oscillation and the enthalpy change for the process have been also examined.Key words: Belousov–Zhabotinsky reaction, oscillatory reaction, oxalic acid, calorimetry, acetone.

Calorimetric study of thiocyanato complexes of the cobalt(II) ion in micellar solutions of a nonionic surfactant

1988 ◽  
Vol 27 (7) ◽  
pp. 1152-1155 ◽  
Author(s):  
Shinichi Ishiguro ◽  
Takeshi Sotobayashi ◽  
Keiichi Satoh ◽  
Kazuo Saito
Keyword(s):  
Nonionic Surfactant ◽  
Calorimetric Study ◽  
Micellar Solutions

Ectodesmata as Revealed By Freeze-Etch Preparations of Plant Epidermal Cell Walls

1973 ◽  
Vol 31 ◽  
pp. 468-469
Author(s):  
N.C. Lyon ◽  
W. C. Mueller
Keyword(s):  
Electron Microscopy ◽  
Acetic Acid ◽  
Nitric Acid ◽  
Oxalic Acid ◽  
Light Microscopy ◽  
Epidermal Cell ◽  
Cell Walls ◽  
Plant Viruses ◽  
Plant Leaves ◽  
Thin Sections

Schumacher and Halbsguth first demonstrated ectodesmata as pores or channels in the epidermal cell walls in haustoria of Cuscuta odorata L. by light microscopy in tissues fixed in a sublimate fixative (30% ethyl alcohol, 30 ml:glacial acetic acid, 10 ml: 65% nitric acid, 1 ml: 40% formaldehyde, 5 ml: oxalic acid, 2 g: mecuric chloride to saturation 2-3 g). Other workers have published electron micrographs of structures transversing the outer epidermal cell in thin sections of plant leaves that have been interpreted as ectodesmata. Such structures are evident following treatment with Hg++ or Ag+ salts and are only rarely observed by electron microscopy. If ectodesmata exist without such treatment, and are not artefacts, they would afford natural pathways of entry for applied foliar solutions and plant viruses.

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