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1

High-performance liquid chromatographic determination of bergenin in different Bergenia species

Singh D. P., Srivastava S. K., Govindarajan R., Rawat A. K. S.

Acta Chromatographica

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2007

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No. 19

246-252

EN

Because previous chemical investigations have revealed the presence of bergenin and gallic acid as important bioactive components of Bergenia, a simple, highly precise RP-HPLC method coupled with photodiode-array detection has been developed and validated for simultaneous determination of these compounds in the Bergenia species B. ligulata (Wall) Eng., B. ciliata (Royle) Raizada, and B. stracheyi Engl. B. ciliata and B. stracheyi were found to contain the most bergenin, 3.275 and 3.277%, respectively; B. ligulata contained 2.419% bergenin.

2

On horizontal and complete lifts of (1,1) tensor fields F satisfying the structure equation anFn+an-1Fn-1+an-2Fn-2+.......a2F2+a1F=0

Nivas R., Ali S., Srivastava S. K.

Demonstratio Mathematica

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2002

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Vol. 35, nr 1

155-163

EN

The horizontal and complete lifts from a differentiable manifold Mn of class C°° to its cotangent bundle T*(Mn) have been studied by Professors Yano and Patterson [5, 6]. Yano and Ishihara [7] studied lifts of f-structure in the tangent and cotangent bundles. F-structure manifolds of degree v > 3 have been studied by Kim [2]. Lifts of (1,1) tensor fields F satisfying Fv+2 - A2Fv-1 = 0 and Fv + (-l)v+1F = 0 have been studied by Srivastava [4]. The present paper deals with some problems on horizontal and complete lifts tensor fields satisfying polynomial equations of the type mentioned above. Integrability conditions are discussed, and prolongations in the third tangent space T3(Mn) are also considered.

3

Przemiany struktur organicznych związków siarki występujących w węglu z kopalni 'Janina' w procesach pirolizy i hydropirolizy

Stańczyk K., Dyla P., Srivastava S. K.

Karbo

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1998

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Nr 4

152-154

PL

Treść: Stosując technikę TPR (Temperaturę Programmed Reduction) przedstawiono przemiany struktur organicznych związków siarki występujących w węglu z kopalni 'Janina ', zachodzące w procesie pirolizy i hydropirolizy. Przedstawiono i przedyskutowano rolg wodoru w transformacji mniej stabilnych form siarki do trwałych, skondensowanych struktur tiofenowych.

EN

By means of TPR technique (Temperature Programmed Reduction) it was presented the transformations of structures for organic sulphur compounds occurring in coal from 'Janina' coal mine which took place during pyrolysis and hydropyrolysis processes. It was presented and discussed the part of hydrogen in the transformation process of less stable sulphur forms to stable condensed structures of thiophenol.