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MEAN SQUARE STABILITY IN A MODIFIED LESLIE-GOWER AND HOLLING-TYPE II PREDATOR-PREY MODEL
Pal, Pallav Jyoti,Sarwardi, Sahabuddin,Saha, Tapan,Mandal, Prashanta Kumar The Korean Society of Computational and Applied Ma 2011 Journal of applied mathematics & informatics Vol.29 No.3
Of concern in the paper is a Holling-Tanner predator-prey model with modified version of the Leslie-Gower functional response. Dynamical behaviours such as stability, permanence and Hopf bifurcation have been carried out deterministically. Using the normal form theory and center manifold theorem, the explicit formulae determining the stability and direction of Hopf bifurcation have been derived. The deterministic model is extended to a stochastic one by perturbing the growth equation of prey and predator by white and colored noises and finally the mean square stability of the stochastic model systems is investigated analytically. An extensive quantitative analysis has been performed based on numerical computation so as to validate the applicability of the proposed mathematical model.
Evaluation of Hepatoprotective Potential of Cassia tora Leaf Extract
Maity, Tapan Kumar,Mandal, Subhash C.,Mukherjee, Pulok K.,Saha, Kakali,Das, J.,Saha, B.P.,Pal, M. The Korean Society of Pharmacognosy 1997 Natural Product Sciences Vol.3 No.2
Methanolic extract of the leaves of Cassia tom was evaluated for its hepatoprotective potentials in rats by inducing hepatotoxicity with carbon tetrachloride. The extract at a dose of 400 mg/kg orally showed significant protective effect by lowering the serum levels of transaminase (SGOT and SGPT), bilirubin and alkaline phosphatase (ALP). The effects produced were comparable to that of a standard hepatoprotective agent.
MEAN SQUARE STABILITY IN A MODIFIED LESLIE-GOWER AND HOLLING-TYPE II PREDATOR-PREY MODEL
Pallav Jyoti Pal,Sahabuddin Sarwardi,Tapan Saha,Prashanta Kumar Mandal 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.3
Of concern in the paper is a Holling-Tanner predator-prey model with modified version of the Leslie-Gower functional response. Dynamical behaviours such as stability, permanence and Hopf bifurcation have been carried out deterministically. Using the normal form theory and center manifold theorem, the explicit formulae determining the stability and direction of Hopf bifurcation have been derived. The deterministic model is extended to a stochastic one by perturbing the growth equation of prey and predator by white and colored noises and finally the mean square stability of the stochastic model systems is investigated analytically. An extensive quantitative analysis has been performed based on numerical computation so as to validate the applicability of the proposed mathematical model.
Utpal Nandi,Shubhasis Dan,Tapan Kumar Pal 한국약제학회 2015 Journal of Pharmaceutical Investigation Vol.45 No.3
A simple, rapid and sensitive high-performance liquid chromatography–tandem mass spectrometry method has been developed and validated according to the Food and Drug Administration (FDA) guidelines for simultaneous determination of metoprolol and telmisartan in rat plasma using atorvastatin as an internal standard. The analytes were separated on a Gemini C18 column (50 mm × 4.6 mm, 5 lm) with an isocratic mobile phase of methanol–water containing 0.5 % formic acid (9:1, v/v) at a flow rate of 0.5 mL/min. The estimation was carried out by triple quadrupole mass spectrometry using electrospray ionization technique, operating in multiple reaction monitoring and positive ion modes. Simple liquid–liquid extraction was used for sample preparation. Linearity was achieved over the concentration range of 1–500 ng/mL for both the analytes in rat plasma. Results of validation parameters of the method were with the acceptance criteria of the FDA guidelines. The method was found suitable to quantitatively assess the pharmacokinetics of metoprolol and telmisartan in rat following administration of a single oral dose 2.5 and 2 mg/kg body weight, respectively in Wistar albino rat.
Mounarik Mondal,Hrishikesh Das,안은영,홍성태,김문조,한흥남,Tapan Kumar Pal 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.5
Friction stir welding (FSW) of dissimilar stainless steels, low nickel austenitic stainless steel and 409M ferriticstainless steel, is experimentally investigated. Process responses during FSW and the microstructures of the resultantdissimilar joints are evaluated. Material flow in the stir zone is investigated in detail by elemental mapping. Elemental mapping of the dissimilar joints clearly indicates that the material flow pattern during FSW depends onthe process parameter combination. Dynamic recrystallization and recovery are also observed in the dissimilarjoints. Among the two different stainless steels selected in the present study, the ferritic stainless steels shows moresevere dynamic recrystallization, resulting in a very fine microstructure, probably due to the higher stacking faultenergy.