Barddhaman, India

University of Burdwan

www.buruniv.ac.in
Barddhaman, India

The University of Burdwan is a public university located in Bardhaman, West Bengal, India. It was established by the West Bengal government as a teaching and affiliating university on 15 June 1960 with six graduate departments and thirty undergraduate colleges spread over five districts that come under the jurisdiction of the university. The jurisdiction covers the districts of Burdwan, Birbhum, Bankura, and Hooghly . The main campus of the university is of 398 acres .The university offers 30 graduate programmes. There are 139 affiliated colleges .The university has been awarded five-star status by the NAAC. Wikipedia.

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Bhattacharjee S.,University of Burdwan
Current Science | Year: 2014

Membranes are the most vital structure for all organisms which not only control molecular trafficking but also perceive environmental cues and transduce it in response. Membrane lipid peroxidation, which is normally associated with natural course of ageing, senescence and environmental stresses, is mechanistically important as it is one of the very few examples of carbon-centered radical production in cell. Chemically, it involves the formation and propagation of lipid radicals, the uptake of molecular oxygen and arrangement of double bonds in the unsaturated lipids and eventually their destruction, with subsequent production of a variety of breakdown products, including alcohol, ketones, alkanes, aldehydes and ethers. The process is considered as the main event involved in oxidative damage to cell, which may eventually cause cell death. A significant proportion of oxidized lipids are electrophilic in nature. Recent studies suggest that reactive lipid species formed through lipid peroxidation can benefit cells in a number of ways. There are strong evidences in support of the view that reactive lipid species-mediated signalling participates in several physiological pathways including apoptosis, induction of antioxidative defence, membrane repair, proteosomal pathway, etc. The activation of cell signalling pathways by reactive lipid species is hierarchical and largely depends on intrinsic chemical reactivity of electrophiles, thiol-containing signalling domains and the subsequent signalling cascades. An effort has been made to provide an update on membrane lipid peroxidation while addressing the conflicting roles of membrane lipid peroxidation in deteriorative oxidative damage and adaptive cell signalling.


Mandal P.,University of Burdwan
Naunyn-Schmiedeberg's Archives of Pharmacology | Year: 2017

Cells are continuously threatened by the damage caused by reactive oxygen/nitrogen species (ROS/RNS), which are produced during physiological oxygen metabolism. In our review, we will summarize the latest reports on the role of oxidative stress and oxidative stress-induced signaling pathways in the etiology of colorectal cancer. The differences in ROS generation may influence the levels of oxidized proteins, lipids, and DNA damage, thus contributing to the higher susceptibility of colon. Reactive species (RS) of various types are formed and are powerful oxidizing agents, capable of damaging DNA and other biomolecules. Increased formation of RS can promote the development of malignancy, and the “normal” rates of RS generation may account for the increased risk of cancer development in the aged. In this review, we focus on the role of oxidative stress in the etiology of colorec-tal cancer and discuss free radicals and free radical-stimulated pathways in colorectal carcinogenesis. © 2017, Springer-Verlag Berlin Heidelberg.


Bhattacharyya K.,University of Burdwan
International Communications in Heat and Mass Transfer | Year: 2011

In this paper, an analysis is presented to study dual nature of solution of mass transfer with first order chemical reaction in boundary layer stagnation-point flow over a stretching/shrinking sheet. The governing equations are transformed into a set of self-similar ordinary differential equations by similarity transformations. The transformed equations are solved numerically using very efficient shooting method. The study reveals that the dual solutions of velocity and concentration exist for certain values of velocity ratio parameter (the ratio of stretching/shrinking rate and straining rate). The concentration boundary layer thickness decreases with increasing values of Schmidt number and reaction-rate parameter for both solutions. © 2011 Elsevier Ltd.


Mukhopadhyay S.,University of Burdwan
Chinese Physics B | Year: 2013

A boundary layer analysis is presented for non-Newtonian fluid flow and heat transfer over a nonlinearly stretching surface. The Casson fluid model is used to characterize the non-Newtonian fluid behavior. By using suitable transformations, the governing partial differential equations corresponding to the momentum and energy equations are converted into non-linear ordinary differential equations. Numerical solutions of these equations are obtained with the shooting method. The effect of increasing Casson parameter is to suppress the velocity field. However the temperature is enhanced with the increasing Casson parameter. © 2013 Chinese Physical Society and IOP Publishing Ltd.


Mukhopadhyay S.,University of Burdwan
Journal of Petroleum Science and Engineering | Year: 2012

This paper presents an axi-symmetric laminar boundary layer mixed convection flow of a viscous incompressible fluid and heat transfer towards a stretching cylinder embedded in porous medium. Variable surface temperature is assumed. The partial differential equations corresponding to the momentum equations are converted into highly non-linear ordinary differential equations with the help of similarity transformations. Numerical solutions of these equations are obtained by shooting method. It is found that the velocity decreases but the temperature increases with increasing permeability parameter. With the increasing values of mixed convection parameter, velocity is found to increase for buoyancy aided flow but opposite nature is noted for buoyancy opposed flow. The skin friction as well as the heat transfer rate at the surface is larger for a cylinder compared to a flat plate. Thermal boundary layer thickness decreases with increasing Prandtl number. © 2012 Elsevier B.V.


Mukhopadhyay S.,University of Burdwan
Nuclear Engineering and Design | Year: 2011

This paper investigates the unsteady mixed convective boundary layer flow and heat transfer over a porous stretching vertical surface in presence of slip. Similarity solutions for the transformed governing equations are obtained and the reduced equations are then solved numerically. With increasing values of the unsteadiness parameter, fluid velocity and the temperature are found to decrease in both the presence and absence of slip at the boundary. Fluid velocity decreases due to increasing values of the velocity slip parameter resulting an increase in the temperature field. Skin-friction decreases with the velocity slip parameter whereas it increases with unsteadiness parameter. The rate of heat transfer decreases with the velocity slip parameter while increases with unsteadiness parameter. Same feature is also noticed for thermal slip parameter. Effects of increasing mixed convection parameter on the velocity boundary layer is to increase the velocity field and the temperature decreases in this case. © 2011 Elsevier B.V. All rights reserved.


Bhattacharyya K.,University of Burdwan
Chinese Physics Letters | Year: 2011

An analysis is made to study boundary layer flow and heat transfer over an exponentially shrinking sheet. Using similarity transformations in exponential form, the governing boundary layer equations are transformed into self-similar nonlinear ordinary differential equations, which are then solved numerically using a very efficient shooting method. The analysis reveals the conditions for the existence of steady boundary layer flow due to exponential shrinking of the sheet and it is found that when the mass suction parameter exceeds a certain critical value, steady flow is possible. The dual solutions for velocity and temperature distributions are obtained. With increasing values of the mass suction parameter, the skin friction coefficient increases for the first solution and decreases for the second solution. © 2011 Chinese Physical Society and IOP Publishing Ltd.


Bhattacharyya K.,University of Burdwan
International Journal of Heat and Mass Transfer | Year: 2012

An analysis is made to investigate the mass transfer in two-dimensional boundary layer flow past a flat plate moving in parallel or reversely to a free stream with first order chemical reaction. The similarity transformations are used to transform the governing equations and the reduced nonlinear self-similar ordinary differential equations are solved numerically using a shooting method. The dual solutions of the velocity and concentration distributions are obtained. With increase of the Schmidt number the mass transfer is found to be enhanced for the upper solution branch and reduced for the lower solution branch. The concentration overshoot for constructive chemical reaction is observed, i.e., for constructive reaction mass absorption occurs. Moreover, for destructive chemical reaction the mass transfer increases. © 2012 Elsevier Ltd. All rights reserved.


The unsteady two-dimensional flow of a MHD non-Newtonian Maxwell fluid over a stretching surface with a prescribed surface temperature in the presence of a heat source/sink is investigated. Similarity solutions for the governing equations are obtained. The transformed boundary layer equations are then solved numerically by using the shooting method. Fluid velocity initially decreases with the increasing unsteadiness parameter, and temperature decreases significantly due to unsteadiness. It is also found that the fluid velocity decreases with the increasing magnetic parameter. Increasing the Maxwell parameter values has the effect of suppressing the velocity field and increasing the temperature. © 2012 Chinese Physical Society and IOP Publishing Ltd.


Bhattacharyya K.,University of Burdwan
Ain Shams Engineering Journal | Year: 2013

The heat transfer in unsteady boundary layer stagnation-point flow over a shrinking/stretching sheet is investigated. The surface temperature of the sheet is taken time dependent. The governing equations are transformed into self-similar ordinary differential equations by adopting similarity transformations and then the converted equations are solved numerically by shooting method. The study reveals that in addition to the velocity field, for the temperature distribution the dual solutions exist for some values of velocity ratio parameter. The heat transfer rate enhances due to the unsteadiness of the flow. The temperature for first solution decreases with unsteadiness parameter, and for second solution the temperature initially decreases, but it increases at large distance from the sheet. Moreover, for dual solutions as well as unique solution cases, the heat transfer rate increases with the Prandtl number in presence of unsteadiness. © 2012 Ain Shams University. Production and hosting by Elsevier B.V. All rights reserved.

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