Magnetohydrodynamics and viscosity variation in couple stress squeeze film lubrication between rough flat and curved circular plates.

A simplified mathematical model has been developed for understanding combined effects of surface roughness, viscosity variation and couple stresses on the squeeze film behaviour of a flat and a curved circular plate in the presence of transverse magnetic field. The Stokes (1966) couple stress fluid model is included to account for the couple stresses arising due to the presence of microstructure additives in the lubricant. In the context of Christensen's (1969) stochastic theory for the lubrication of rough surfaces, two types of one-dimensional roughness patterns (radial and azimuthal) are considered.

High dose streptokinase for thrombolysis in the immediate postoperative period: a case report.

Venous thrombo-embolism is a life threatening condition with often non specific presentation. The detection of massive pulmonary embolism in the intra and immediate post-operative period is not only difficult due to the variety of conditions with similar presentation, but the therapy for the same is complicated with concerns of surgical and intracranial bleeding precluding various options. We present a case of massive pulmonary embolism presenting as intraoperative hypotension with an increased alveolar to arterial CO2 gradient which was subsequently managed with an accelerated regimen of streptokinase without increased postoperative bleeding.

Stereochemical studies on nucleic acid analogues. I. Conformations of alpha-nucleosides and alpha-nucleotides: interconversion of sugar puckers via O4'-exo.

The preferred conformations of ribo and deoxyribo alpha-nucleosides and alpha-nucleotides, the stereoisomers of the naturally occurring beta-isomers, are worked out by minimizing the conformational energy as a function of all the major parameters including the sugar ring conformations along the pseudorotation path. The results of the studies bring out certain distinct conformational features that are at variance with their beta counterparts. The range of glycosyl conformations are found to be not only quite restricted here but favor predominantly the anti conformation.