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Swarup Narain Tewari 《Colloid and polymer science》1954,135(3):159-160
A Chromatographic method for the separation and detection of lead, silver, and mercury by extraction with organic solvent
mixture on strips or sheets of filter paper, is described. Study of various physico-chemical factors responsible for the separation
of cations has been made.
The thanks 01 the author are due to Dr. N. Ghatak, D. So., Chemical-Examiner to the Government of Uttar Pradesh, for his keen interest in this investigation. 相似文献
Zusammenfassung Es wird eine chromatische Methode zur Trennung und Feststellung von Blei, Silber und Quecksilber durch Extraktion mittels Gemischen aus organischen Flüssigkeiten auf Papierstreifen beschrieben und die verschiedenen für die Trennwirkung verantwortlichen physikalisch-chemischen Faktoren werden betrachtet.
The thanks 01 the author are due to Dr. N. Ghatak, D. So., Chemical-Examiner to the Government of Uttar Pradesh, for his keen interest in this investigation. 相似文献
55.
Boyd DR Sharma ND Byrne BE Haughey SA Kennedy MA Allen CC 《Organic & biomolecular chemistry》2004,2(17):2530-2537
Toluene- and naphthalene-dioxygenase-catalysed sulfoxidation of nine disubstituted methylphenyl sulfides, using whole cells of Pseudomonas putida, consistently gave the corresponding enantioenriched sulfoxides. Using the P. putida UV4 mutant strain, and these substrates, differing proportions of the corresponding cis-dihydrodiol sulfides were also isolated. Evidence was found for the concomitant dioxygenase-catalysed cis-dihydroxylation and sulfoxidation of methyl para-tolyl sulfide. A simultaneous stereoselective reductase-catalysed deoxygenation of (S)-methyl para-tolyl sulfoxide, led to an increase in the proportion of the corresponding cis-dihydrodiol sulfide. The enantiopurity values and absolute configurations of the corresponding cis-dihydrodiol metabolites from methyl ortho- and para-substituted phenyl sulfides were determined by different methods, including chemoenzymatic syntheses from the cis-dihydrodiol metabolites of para-substituted iodobenzenes. Further evidence was provided to support the validity of an empirical model to predict, (i) the stereochemistry of cis-dihydroxylation of para-substituted benzene substrates, and (ii) the regiochemistry of cis-dihydroxylation reactions of ortho-substituted benzenes, each using toluene dioxygenase as biocatalyst. 相似文献
56.
Lie symmetry method is used to perform detailed analysis on a class of KS equations. It is shown that the Lie algebra of the equation spanned by the vector fields of dilations in time and space are lost as a result of the linearity of the equation when n = 1. Symmetry reductions are carried out using each member of the optimal system. The reduced equations are further studied to obtain certain general solutions. Moreover, the conserved vectors are obtained through the application of Noether's theorem. 相似文献
57.
Swarup Narain Tewari 《Mikrochimica acta》1961,49(1):37-40
Summary The separation by paper chromatography and identification of reducing sugars in urine is described.
Zusammenfassung Die papierchromatographische Trennung und Identifizierung reduzierender Zucker im Harn wird beschrieben.
Résumé On décrit la séparation par Chromatographie sur papier et l'identification des sucres réducteurs dans l'urine.相似文献
58.
A layer of compressible, rotating, elastico-viscous fluid heated & soluted from below is considered in the presence of vertical magnetic field to include the effect of Hall currents. Dispersion relation governing the effect of viscoelasticity, salinity gradient, rotation, magnetic field and Hall currents is derived. For the case of stationary convection, the Rivlin-Erickson fluid behaves like an ordinary Newtonian fluid. The compressibility, stable solute gradient, rotation and magnetic field postpone the onset of thermosolutal instability whereas Hall currents are found to hasten the onset of thermosolutal instability in the absence of rotation. In the presence of rotation, Hall currents postpone/hasten the onset of instability depending upon the value of wavenumbers. Again, the dispersion relation is analyzed numerically & the results depicted graphically. The stable solute gradient and magnetic field (and corresponding Hall currents) introduce oscillatory modes in the system which were non-existent in their absence. The case of overstability is discussed & sufficient conditions for non-existence of overstability are derived. 相似文献
59.
The properties of the low-lying excited states of53Mn have been investigated in the framework of the intermediate-coupling unified nuclear model. In the present calculations, it was assumed that three holes in the 1f 7/2 proton shell, which undergo excitations, are coupled to the quadrupole vibrations of the doubly even core. Energy levels and electromagnetic properties have been calculated. In most cases, the results are found to be in good agreement with the experimentally observed values for the low-lying excited states in53Mn. The results are also compared with those obtained from other models. 相似文献
60.