Browsing by Author "L. Pandey"

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A model for lamellar eutectic solidification
(1987) L. Pandey; P. Ramachandrarao
Interface shape and interface solute concentrations have been obtained for lamellar eutectic solidification on the assumption that the latter is proportional to the deviation of the interface from a plane front. It has been shown that the well known constancy of λ2R and ΔTλ in lamellar eutectics is a consequence of conservation of solute during steady state growth and the need to maintain force balance at the triple points on the interface. The model is applied to the Al-CuAl2 eutectic system and the magnitudes of the Gibbs-Thompson coefficients for the two phases are found. These and the interfacial angles are shown to be in good agreement with experiment. © 1987.
Changing picture of acute kidney injury in pregnancy: Study of 259 cases over a period of 33 years
(Medknow Publications, 2016) J. Prakash; P. Pant; S. Prakash; M. Sivasankar; R. Vohra; P.K. Doley; L. Pandey; U. Singh
The incidence of acute kidney injury (AKI) in pregnancy is declining in developing countries but still remains a major cause of maternal and fetal morbidity and mortality. The aim of the study was to analyze the changing trends in pregnancy related AKI (PR-AKI) over a period of thirty-three years. Clinical characteristics of PR-AKI with respect to incidence, etiology and fetal and maternal outcomes were compared in three study periods, namely 1982-1991,1992-2002 and 2003-2014. The incidence of PR-AKI decreased to 10.4% in 1992-2002, from 15.2% in 1982-1991, with declining trend continuing in 2003-2014 (4.68%).Postabortal AKI decreased to 1.49% in 2003-2014 from 9.4% in 1982-1991of total AKI cases.The AKI related to puerperal sepsis increased to 1.56% of all AKI cases in 2003-2014 from 1.4% in 1982-1991. Preeclampsia/eclampsia associated AKI decreased from 3.5% of total AKI cases in 1982-1991 to 0.54% in 2003-2014. Pregnancy associated - thrombotic microangiopathy and acute fatty liver of pregnancy were uncommon causes of AKI. Hyperemesis gravidarum associated AKI was not observed in our study. Incidence of renal cortical necrosis (RCN) decreased to 1.4% in 2003-2014 from 17% in 1982-1991.Maternal mortality reduced to 5.79% from initial high value 20% in 1982-1991. The progression of PR-AKI to ESRD decreased to1.4% in 2003-2014 from 6.15% in 1982-1991. The incidence of PR-AKI has decreased over last three decades, mainly due to decrease in incidence of postabortal AKI. Puerperal sepsis and obstetric hemorrhage were the major causes of PR-AKI followed by preeclampsia in late pregnancy. Maternal mortality and incidence and severity of RCN have significantly decreased in PR-AKI. The progression to CKD and ESRD has decreased in women with AKI in pregnancy in recent decade. However, the perinatal mortality did not change throughout study period.
Effect of streptomycin on extracellular proteases production by Fusarium oxysporum
(1988) R. Gaur; A.K. Pandey; L. Pandey
[No abstract available]
Thermodynamic perturbation theory for molecular fluids: Application to nearly spherically symmetric molecules
(1979) K.P. Shukla; L. Pandey; Y. Singh
A temperature-dependent (preaveraged) potential independent of orientation, which is thermodynamically equivalent to an orientation-dependent two- and three-body potential, is developed. The influence on the preaveraged potential of angle-dependent pair interactions (which arise from permanent electric-multipole moments, induced dipole moments, anisotropic dispersion and overlap forces), of three-body non-additive interactions (which arise from dispersion and classical electric-induction interactions between asymmetric molecules) is considered. This preaveraged potential is used to devise a simple perturbation scheme for the calculation of the thermodynamic properties in terms of the properties of a hard-sphere fluid. The calculated thermodynamic properties (configurational energy, entropy and pressure) for nitrogen and methane are in very good agreement with the experimental data.
Thermostability of extracellular protease enzyme produced by Spicaria fusispora, a thermophilic fungus
(1989) R. Gaur; J. Yadav; L. Pandey
[No abstract available]