Peristaltic Transport of a Couple Stress Fluid: Some Applications to Hemodynamics

The present paper deals with a theoretical investigation of the peristaltic transport of a couple stress fluid in a porous channel. The study is motivated towards the physiological flow of blood in the micro-circulatory system, by taking account of the particle size effect. The velocity, pressure gradient, stream function and frictional force of blood are investigated, when the Reynolds number is small and the wavelength is large, by using appropriate analytical and numerical methods. Effects of different physical parameters reflecting porosity, Darcy number, couple stress parameter as well as amplitude ratio on velocity profiles, pumping action and frictional force, streamlines pattern and trapping of blood are studied with particular emphasis. The computational results are presented in graphical form. The results are found to be in good agreement with those of Shapiro et. al \cite{r25} that was carried out for a non-porous channel in the absence of couple stress effect. The present study puts forward an important observation that for peristaltic transport of a couple stress fluid during free pumping when the couple stress effect of the fluid/Darcy permeability of the medium, flow reversal can be controlled to a considerable extent. Also by reducing the permeability it is possible to avoid the occurrence of trapping phenomenon

Longterm Effect Of Phenytoin On Lipid Profile Parameters In Epileptic Patients

Research Problem: What are the factors responsible for decreased incidence of coronary artery disease in epileptics? Objectives: To evaluate the effect of phenytoin on lipid profile parameters in epileptics and to discuss its implications. Study Design: Prospective study. Setting: Neurology clinic of Medicine Department of a teaching hospital. Participants: Randomly selected epileptic patient at­tending neurology clinic and admitted to inpatient department of J. N. Medical College Hospital. Sample Size: 56 epileptic patients. Study Variables: Phenytoin therapy, lipid profile pa­rameters. Statistical Analysis: By test of significance. Result: No significant change in serum levels of total cholesterol, LDL - C, VLDL - C, triglycerides and phospholipids was observed with phenytoin therapy during study. However, serum HDL - C showed a significant increase, both at 12 weeks and 24 weeks ( P < 0.001) of therapy. Conclusion: Phenytoin,    a    commonly used anticonvulsive drug, increases serum HDL - C level significantly, while there is no significant change in other parameters of lipid profile. This rise in HDL - C may provide protection to epileptic patients against atherogenic vascular diseases including coronary ar­tery disease

Digitally Programmable Fully Differential Filter

In this paper a new digitally programmable voltage mode fully differential Kerwin-Huelsman-Newcomb(KHN) filter is realized using digitally controlled CMOS fully balanced output transconductor (DCBOTA). The realized filter uses five DCBOTAs, a single resistor and two capacitors. The filter provides low-pass, high-pass and band-pass responses simultaneously. The pole-frequency of all the responses is controlled by externally applying an 8- bit digital control word. All the responses exhibit independent digital control for pole-ω0 and pole-Q. The proposed filter also offers low passive sensitivities. Non-ideal gain and parasitic associated with the actual DCBOTA is also discussed. The CMMR results for low-pass response are also included which highlight the advantage of a fully-differential operation. Exhaustive PSPICE simulation is carried out using 0.5µ technology which may be further scaled to explore state-of-the-art applications of the proposed circuit

Cancer drug therapy and stochastic modelling of “nano-motors”

Controlled inhibition of kinesin motor proteins is highly desired in the field of oncology. Among other interventions, the selective Eg5 competitive and allosteric inhibitors is the most successful targeted chemotherapeutic regime/options, inducing cancer cell apoptosis and tumor regression with improved safety profile. Though promising, this approach is under clinical trials, for the discovery of efficient and least harmful Eg5 inhibitors. The aim of present research is to bridge the computational modelling approach with drug design and therapy of cancer cells. Thus a computational model, interfaced with the clinical data of “Eg5 dynamics” and “inhibitors” via special functions is presented in this article. Comparisons are made for the drug efficacy and the threshold values are predicted through numerical simulations

A review on hyperthermia via nanoparticle-mediated therapy

Hyperthermia treatment, generated by magnetic nanoparticles (MNPs) is promising since it is tumour-focused, minimally invasive and uniform. The most unique feature of magnetic nanoparticles is their reaction to and manipulation by a magnetic force which is responsible for enabling their potential as heating mediators for cancer therapy. With magnetic nanoparticle hyperthermia, a tumour is preferentially loaded with systemically administered nanoparticles with high-absorption cross section for transduction of an extrinsic energy source to heat. To maximize the energy deposited in the tumour while limiting the exposure in healthy tissues, the heating is achieved by exposing the region of tissue containing magnetic nanoparticles to an alternating magnetic field. The magnetic nanoparticles dissipate heat from relaxation losses thereby heating localized tissue above normal physiological ranges. Besides thermal efficiency, the biocompatibility of magnetite nanoparticles assists in their deployment as efficient drug carriers for targeted therapeutic regimes. In the present article we provide a state-of-the-art review focused on progress in nanoparticle induced hyperthermia treatments which have several potential advantages over both global and local hyperthermia treatments achieved without nanoparticles. Green bio-nanotechnology has attracted substantial attention and has demonstrable abilities to improve cancer therapy. Furthermore we have listed the challenges associated with this treatment along with future opportunities in this field which it is envisaged will be of interest to biomedical engineers, bio-materials scientists, medical researchers and pharmacological research groups

Spectral relaxation computation of electroconductive nanofluid convection flow from a moving surface with radiative flux and magnetic induction

A theoretical model is developed for steady magnetohydrodynamic (MHD) viscous flow resulting from a moving semi-infinite flat plate in an electrically conducting nanofluid. Thermal radiation and magnetic induction effects are included in addition to thermal convective boundary conditions. Buongiorno’s two-component nanoscale model is deployed, which features Brownian motion and thermophoresis effects. The governing nonlinear boundary layer equations are converted to nonlinear ordinary differential equations by using suitable similarity transformations. The transformed system of differential equations is solved numerically, employing the Spectral relaxation method (SRM) via MATLAB R2018a software. SRM is a simple iteration scheme that does not require any evaluation of derivatives, perturbation, and linearization for solving a non-linear systems of equations. Effects of embedded parameters such as sheet velocity paramete

Role of key players in paradigm shifts of prostate cancer bone metastasis

Prostate cancer is one of the most common human cancers and bone metastasis is a frequent finding in the natural history of several types of cancers. The molecular mechanisms that makes prostate cancer metastasize to bone have recently been identified, and provide new molecular targets for drug development, several biochemical by-products that provide insight into the tumorbone interaction, with potential to enhance the clinical management of patients with bone metastases, have been reported during the past decade, however, its anticipated risk, diagnosis and response to therapy are still challenging to assess in clinical practice. In this article, we will discuss these challenges with an emphasis on the communication pathways between each cell type involved and the roles of Wnts, sclerostin, RANKL, PTHrP and macrophages