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Articles by R. Srivastava
Total Records ( 3 ) for R. Srivastava
  R. Srivastava , A.R. Saksena and Arti Gupta
  Density and Viscosity for ternary systems (amino acid + I2 + water) containing amino acid viz; alanine, valine, leucine, isoleucine in aqueous solutions have been measured for several concentrations of amino acids as donors at different temperatures (303, 313, 323 K). Using above data internal pressure, absorbance, relative viscosity, Falkenhagen coefficient A, Jones-Doles coefficient B and thermodynamic parameters have been computed, Viscosities of the ternary mixtures have been correlated successfully using Jones-Doles and Vand’s equation. Kinetic and thermodynamic parameters have been calculated to interpret 1:1 molecular association. The UV spectra have been used to support the mechanism of association in correlation with evaluated, observed and derived parameters.
  R. Srivastava , R. Khan , S.A. Nasim , N. Manzoor and Mahmooduzzafar
  Glycine max L. (Soybean) is known for having its medicinal and nutritional value. It has capacity to accumulate high concentrations of cadmium (Cd). Studies were carried out to evaluate secondary metabolites production and biochemical potential of plant exposed to Cd-rich growing medium. Cd treatment in the form of Cadmium chloride (CdCl2) at supply of 0.25, 0.50, 1.00 and 2 mg L-1 increased the amino acid, protein, proline and diadzene content in field grown soybean plants at different developmental stages of Glycine max L. The enhancement was significant at Cd treatment of 1 mg L-1. The activity of antioxidant enzymes viz., superoxide dismutase (SOD), catalase (CAT) and Glutathione Reductase (GR) increased with increase in treatment of Cd in all developmental stages of soybean but increase in enzyme activity was more significant at Cd treatment of 2 mg L-1. Present finding suggested that higher diadzene production in cd enriched soyabeen contributed to higher medicinal value.
  Achamma John Mathai , K.D. Patel and R. Srivastava
  Two types of In-pWSe2 Schottky barrier diodes were fabricated, one on as grown (uncleaved) and the other on cleaved WSe2 surface. Current-voltage characteristics of these diodes have been analyzed over a wide span of temperature ranging from 140 K to 300 K on the basis of thermionic emission theory with Gaussian distribution model of barrier height. Below 200 K, a model has been considered where the total current is assumed to be the sum of thermionic emission, generation recombination and tunneling components. The observed deviation in barrier height, ideality factor and Richardson plot below 200 K are interpreted in terms of the contribution of these multiple charge transport mechanisms across the interface of the fabricated diodes.
 
 
 
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