Ionic Processes in Saturated Solutions of MgCl2·6H2O in Solutions of Other Divalent Metals

2001 ◽  
Vol 66 (1) ◽  
pp. 89-98 ◽  
Author(s):  
Jitka Eysseltová
Keyword(s):  
Complex Formation ◽  
Copper Ions ◽  
Chloride Complex ◽  
The Other ◽  
Mercury Ions ◽  
Transfer Energy ◽  
Iron Cobalt ◽  
Usual Procedure ◽  
Solubility Isotherms ◽  
Saturated Solutions

Solubility isotherms of MgCl2·6H2O at 25 °C in solutions of chlorides of bivalent beryllium, calcium, manganese, iron, cobalt, zinc and mercury were treated by the hydration analysis. In addition to the usual procedure, the recently developed modified transfer energy Ξ was used to characterize the situation in saturated solutions. As a result, the following ionic processes were established in the saturated solutions under consideration: competition for water in solutions of MgCl2·6H2O containing beryllium and calcium chloride, complex formation in solutions of MgCl2·6H2O containing manganese, cobalt, zinc and mercury ions and formation of ions with heterogeneous coordination sphere in solutions of MgCl2·6H2O containing iron or copper ions. In the last case, the ability of the formed ions to crystallize from solution was found to be reduced in comparison with the other cases. Activity coefficients of MgCl2 were calculated along the solubility curves under consideration.

Extraction of iron, cobalt, nickel and copper with dibenzyl sulfoxide solution in toluene

1979 ◽  
Vol 44 (7) ◽  
pp. 2024-2031 ◽  
Author(s):  
František Vláčil ◽  
Huynh Dang Khanh
Keyword(s):  
Nitric Acid ◽  
Hydrochloric Acid ◽  
Distribution Ratio ◽  
Separation Factor ◽  
Chromatographic Separation ◽  
The Other ◽  
Iron Cobalt ◽  
Cobalt Nickel ◽  
Factor Α

The dependence of the distribution ratio of the metal on the concentration of hydrochloric of nitric acid was examined for Fe, Co, Ni and Cu extraction with 0.05M solution of dibenzylsulfoxide in toluene. Iron is extracted considerably more than the other metals, and is better extracted from hydrochloric acid than from nitric acid. The separation factor αFe/M (for 8M-HCl) is of the order of 104; this is not sufficient for a separation of trace quantities of iron from Co, Ni and Cu, but even at lower concentrations of HCl (e.g., 5M) the values is high enough for extraction chromatographic separation. The composition of the iron solvate extracted from HCl or LiCl medium was determined to be HFeCl4.2 B (B = dibenzyl sulfoxide).

scholarly journals Simulation of the electron-paramagnetic-resonance spectrum of the iron-protein of nitrogenase. A prediction of the existence of a second paramagnetic centre

1978 ◽  
Vol 175 (3) ◽  
pp. 955-957 ◽  
Author(s):  
D J Lowe
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectrum ◽  
Complex Formation ◽  
Resonance Spectrum ◽  
The Other ◽  
Paramagnetic Centre ◽  
Paramagnetic Resonance ◽  
Iron Protein ◽  
Integrated Intensities ◽  
Electron Paramagnetic

The e.p.r. spectra of the Fe-proteins of nitrogenase from all sources studied have unusual features in that they have very anisotropic linewidths and low integrated intensities. These characteristics can be explained by assuming that one of the two electrons accepted by these proteins is located at a rapidly relaxing paramagnetic centre that is unobservable by e.p.r., but causes anisotropic broadening of the e.p.r. signal of the other electron. Complex-formation between Fe-proteins and MgATP is described in terms of a 50-60 degrees rotation of the e.p.r.-observable centre.

Cobalt(II) Chloride Complex Formation in Acetamide–Calcium Nitrate Tetrahydrate Melts

2004 ◽  
Vol 33 (3) ◽  
pp. 287-300 ◽  
Author(s):  
Jelena Savović ◽  
Ružica Nikolić ◽  
Dragan Veselinović
Keyword(s):  
Complex Formation ◽  
Calcium Nitrate ◽  
Chloride Complex ◽  
Calcium Nitrate Tetrahydrate ◽  
Nitrate Tetrahydrate

Polarization and apparent dipole moments of some symmetrical molecules

1991 ◽  
Vol 56 (2) ◽  
pp. 406-410 ◽  
Author(s):  
Otto Exner ◽  
Ivan Mach
Keyword(s):  
Complex Formation ◽  
Standard Method ◽  
Dipole Moments ◽  
The Other ◽  
Atomic Polarization ◽  
Other Hand ◽  
Unknown Structure ◽  
Apparent Orientation

Polarization and apparent dipole moments of a series of symmetrical molecules were determined by the standard method in three solvents: benzene, p-xylene, and mesitylene. Their explanation by complex formation with solvent applies only in the case of 1,4-dicyanobenzene and 4,4’-dicyanobiphenyl since the apparent orientation polarizations (PO.app) are large and depend strongly on solvent. On the other hand, 1,4-dihalogenbenzenes do not form any complexes and PO.appis virtually zero. 1,4-Dihalogenbicyclo[2,2,2]octanes reveal also considerable PO.app which is attributed mainly to enhanced atomic polarization but – in the case of heavier halogens – also partly to complexes of unknown structure.

Calcium, Iron and Cobalt Accumulation in Root Hairs of Soybean (Glycine max)

1985 ◽  
Vol 40 (11-12) ◽  
pp. 912-913 ◽  
Author(s):  
Dietrich Werner ◽  
Klaus-Peter Kuhlmann ◽  
Frank Gloystein ◽  
Friedrich-W. Richter
Keyword(s):  
Triticum Aestivum ◽  
Glycine Max ◽  
Root System ◽  
Root Hairs ◽  
The Other ◽  
Rhizobium Japonicum ◽  
Target Cells ◽  
Iron Cobalt ◽  
Calcium Iron

Abstract Root hairs of soybeans (Glycine max), target cells for infection by Rhizobium japonicum accumulate iron more than 10-fold, cobalt more than 8-fold and calcium more than 7-fold compared to the other parts of the root system. In root hairs of wheat (Triticum aestivum) a much smaller accumulation of these elements was found. The symbiont of Glycine max, Rhizobium japonicum, is known to have a high requirement for iron, cobalt and calcium.

Conformational Alterations of α2-Antiplasmin Induced by Complex Formation with Plasmin

1979 ◽  
Author(s):  
E.F. Plow ◽  
B. Wiman ◽  
D. Collen
Keyword(s):  
Complex Formation ◽  
Structural Changes ◽  
Limited Proteolysis ◽  
Terminal Region ◽  
The Other ◽  
Antigenic Determinants ◽  
Chemical Analyses ◽  
Large Fragment ◽  
Reactive Site ◽  
Immunodiffusion Analysis

The conformational and structural changes induced in the α2-antiplasmin (AP) molecule by complex formation with plasmin have been analyzed utilizing quantitative radioimmuno-chemical analyses. Complexes prepared in plasmin excess -(PAP-P) and therefore subjected to limited proteolysis and complexes prepared in AP excess (PAP-A) have been compared with free AP. With AP antiserum, PAP-A, PAP-P and AP yielded reactions of complete identity by immunodiffusion analysis. In radioimmunoassay, however, these were clearly distinguished, and four distinct sets of antigenic determinants were delineated. Set I determinants were expressed equivalently by PAP-P, PAP-A and AP and were, therefore, not altered by complex formation. This set was recognized by 90% of the antibodies, and the determinants were all included within a large fragment of Mr 60,000 derived from the NH2-terminal region of AP. The other three sets of determinants were modulated by complex formation. Set II was expressed by PAP-A and AP but not by PAP-P, and these were sensitive to proteolysis by plasmin. Set III determinants were expressed only by AP and were localized to a peptide of Mr 8,000 derived from the COOH-terminal region of AP. Set IV determinants were also present only on AP but were not present in the peptide and required an intact reactive site in AP for expression. Thus, there is evidence for multiple conformational modulations in AP induced by complex formation, and these modulations can be pinpointed to specific loci within the AP molecule.

scholarly journals Strahlenchemie von alkoholen XV

1970 ◽  
Vol 25 (12) ◽  
pp. 1405-1407 ◽  
Author(s):  
C. v. Sonntag ◽  
E. Thoms
Keyword(s):  
Ethylene Glycol ◽  
Material Balance ◽  
The Other ◽  
Oh Radicals ◽  
Water Radiolysis ◽  
Increasing Temperature ◽  
Saturated Solutions

In the γ-radiolysis of aqueous N2O-saturated solutions of ethylene glycol (0,1 M) the following products (G-values at 20°C) were found: succinaldehyde (1,7S), glycolaldehyde (1,05), acetaldehyde (1,2), 3,4-dihydroxybutanal (0,22), and erythritol (0,15). Radicals from the water radiolysis (H˙ and ˙OH) attack ethylene glycol and yield ˙CHOH -CH2OH radicals. These radicals readily split off water yielding ˙CH2- CHO radicals [reaction (3)]. All products can be explained by disproportionation or dimerization of these two radicals. Material balance of products formed with respect to the primary yields of ˙H and ˙OH radicals from water radiolysis was obtained.˙CHOH-CH2OH -+ CHO-CH2˙ +H2O. (3)CHO-CH2˙+CH2OH-CH2OH→CHO-CH3+˙CHOH-CH2OH. (9)In contrast to the yields of the other products the acetaldehyde yield depends strongly on ethylene glycol concentration and temperature. With increasing temperature and ethylene glycol concentration the chain (3) - (9) - (3) becomes more and more important

Conclusion

2017 ◽  
Author(s):  
Dia Da Costa
Keyword(s):  
Complex Formation ◽  
The Other ◽  
Production Rule ◽  
Creative Economy ◽  
Embodied Knowledge ◽  
Transformative Potential

The conclusion draws out main findings and contributions of a book that provides historical, spatial and ethnographic specificity to creative economy discourses and their critiques. It calls for provincializing creative economy discourses everywhere that they circulate; charting out and seeing the relational constitution of what counts as creativity in hegemonic and unrecognized creative practices; and attending to a visceral materialism that traces the complex formation of embodied knowledge produced in structures of production, rule and feeling. Ultimately, the praxis of the two troupes and the creative, transformative potential embedded in their suffering, despair and pessimism not only indicates and explains their hunger called theater, it also reminds us to reimagine creative economy in the image of creativity rather than the other way around.

Calcium chloride complex formation of glucose syrups and their fractions

1986 ◽  
Vol 19 (2) ◽  
pp. 149-158 ◽  
Author(s):  
G. Pasin ◽  
G.G. Birch
Keyword(s):  
Complex Formation ◽  
Calcium Chloride ◽  
Chloride Complex

scholarly journals On the electromagnetic fields due to variable electric charges and the intensities of spectrum lines according to quantum theory

1935 ◽  
Vol 148 (864) ◽  
pp. 453-470
Keyword(s):  
Quantum Theory ◽  
Electromagnetic Fields ◽  
The Other ◽  
Spatial Extent ◽  
Classical Formula ◽  
Electric Moment ◽  
Spectrum Line ◽  
Usual Procedure ◽  
The One ◽  
Rigorous Method

1. During 1933 two papers with the above title, the one by Schott and the other by Fock, were published. Schott in his paper criticizes the usual procedure adopted in the Quantum Theory for the estimation of the intensities of a spectrum line according to the classical formula of Hertz, viz.., 2 p ..2 /3 c 3 , where p is the electric moment of the distribution producing the spectrum line, which necessarily assumes that the distribution can be concentrated in a dipole of the same moment p. In view of this criticism he develops a more rigorous method for calculating the electromagnetic fields due to variable electric charges. His method is based upon Maxwell's theory, as represented by his elctromagnetic equations and their solutions in terms of the classical retarded potential integrals and no initial assumptions are made respecting the spatial extent or the rate of variation of the electric distributions considered.

Sign in / Sign up

Export Citation Format

Share Document