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Chattopadhyay, Debprasad,Arunachalam, G.,Sur, T.K.,Bhattacharya, S.K.,Mandal, Asit B. Kyung Hee Oriental Medicine Research Center 2005 Oriental pharmacy and experimental medicine Vol.5 No.2
Two popular ethnomedicines of the Onge, a Negrito tribe of Andaman Islands, were evaluated for analgesic and antiinflammatory activity. The methanol extract as well as the different fractions of methanol extract of both Alstonia macrophylla and Mallotus peltatus leaves were studied using Swiss albino mice and Wistar albino rats. Acetic acid induced writhing, Tail flick and Tail immersion; Carrageenin- and Dextran-induced paw oedema tests were used. Dose-dependent analgesic and antiinflammatory activity were demonstrated for both methanol leaf extracts as well as fractions. Results were highly comparable with that of the standard drug pethidine.
Patterning of Thin Copper Films under UV Exposure in Chlorine-Based Liquids
Chattopadhyay K.K.,안일신,Cho Jongkyu,Kim Okkyung,Kwak Jiwoon,Kyoung Jaisun 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.48 No.6
Wet etching of thin copper films was achieved by using chlorine-based liquids, such as 1,2- dicholorethane or NaCl dissolved in water, under ultraviolet (UV) irradiation. The etching of the thin copper film was probed in-situ by using a spectroscopic ellipsometer, and the etch rate could be controlled by adjusting the exposure parameters. As UV is used in lithography, mask patterns can be transferred to a copper surface directly without resorting to a complex photoresist process. Easy control of the etch rate ranging from sub °A/s and use of nontoxic liquids such as 1,2-dicholoroethane and NaCl solution are major advantages of this novel technique.
$\alpha$- and $\beta$-Amylase Isozyme Expresser Native Proteins in Tropical Silkworm Bombyx mori L.
Chattopadhyay, G.K.,Verma, A.K.,Sengupta, A.K.,Das, S.K.,Urs, S.Raje Korean Society of Sericultural Science 2004 International Journal of Industrial Entomology Vol.8 No.2
Amylase isozyme based three multivoltine viz., N+p, Np, N+ $p^{cho}$ and two bivoltine-D6+p, D6p syngenic lines (Syn. L) were developed from germplasm (GP) stocks Nistari (N) and D6 respectively. haemolymph isozyme pattern at pH 7.0 and 8.5 depicted a total 11 number (Am $y_{1 to 6}$ at pH 7.0 and Am $y^{l to 5}$ at pH 8.5) of native proteins (NP) of various sizes are amylase isozyme expressers. Among eleven NPs, two NPs of 770 kDa (Am $y^{6}$ at pH 7.0) and 376 kDa (Am $y^3$ at pH 8.5) are $\alpha$-amylase expressers and remaining NPs of 370, 364, 350, 329 and 274 kDa at pH 7.0 and 206, 292, 416, 725 kDa at pH 8.5 are $\beta$-amylase expressers. Accordingly, digestive juice amylase isozyme pattern at aforesaid pH also depicted a total number of 10 NPs (Am $y^{1 to 5}$) at each pH 7.0 and 8.5 are amylase expressers of which NP of 387 kDa (Am $y^4$ at pH 7.0) and 780 kDa (Am $y^{5}$ at pH 8.5) are a-amylase expresser. Remaining NPs of 338,297 & 216 kDa at pH 7.0 and 370, 341, 329 &302 kDa at pH 8.5 are $\beta$-amylase expresser. Recurrent backcross lines (RBL) viz., N+pRBL and NpRBL were developed through introgression of high shell weight character (a multigenic trait) to be used further for congenic line (Con. L) development and to understand any association with introgressed character. Isozyme pattern in haemolymph of RBLs depicted only one $\alpha$-amylase of 770 kDa at pH 7.0 and 376 kDa at pH 8.0 with three and four respective $\beta$-amylase bands but in bivoltine lines numbers of $\beta$-amylase bands vary between 1 to 2 at aforesaid pH. Variability was also observed in digestive juice of multivolitine and its RBLs but bivoltine lines express null activity at both pH except appearance of one very week $\alpha$-amylase band D6+p at pH 8.5. Overall study suggests that not a single NP at both pH is common for expression of any band of amylase isozyme i.e., a totally different set of proteins are the amylase isozyme expresser at specific pH and no molecular factor of amylase is associated in developed RBLs which showed improvement on survival, single cocoon shell weight (SCSW) and single filament length over receptor parents.s.s.s.
α- and β-Amylase Isozyme Expresser Native Proteins in Tropical Silkworm Bombyx mori L.
( G. K. Chattopadhyay ),( A. K. Verma ),( A. K. Sengupta ),( S. K. Das ),( S. Raje Urs ) 한국잠사학회 2007 International Journal of Industrial Entomology Vol.8 No.2
Amylase isozyme based three multivoltine viz., N+p, Np, N+p(cho) and two bivoltine-D6+p, D6p syngenic lines (Syn. L) were developed from germplasm (GP) stocks Nistari (N) and D6 respectively. haemolymph isozyme pattern at pH 7.0 and 8.5 depicted a total 11 number (Amy1 to 6 at pH 7.0 and Amy1 to 5 at pH 8.5) of native proteins (NP) of various sizes are amylase isozyme expressers. Among eleven NPs, two NPs of 770 kDa (Amy6 at pH 7.0) and 376 kDa (Amy3 at pH 8.5) are a-amylase expressers and remaining NPs of 370, 364, 350, 329 and 274 kDa at pH 7.0 and 206, 292, 416, 725 kDa at pH 8.5 are β-amylase expressers. Accordingly, digestive juice amylase isozyme pattern at aforesaid pH also depicted a total number of 10 NPs (Amy1 to 5) at each pH 7.0 and 8.5 are amylase expressers of which NP of 387 kDa (Amy4 at pH 7.0) and 780 kDa (Amy5 at pH 8.5) are a-amylase expresser. Remaining NPs of 338,297 & 216 kDa at pH 7.0 and 370, 341, 329 &302 kDa at pH 8.5 are β-amylase expresser. Recurrent backcross lines (RBL) viz., N+pRBL and NpRBL were developed through introgression of high shell weight character (a multigenic trait) to be used further for congenic line (Con. L) development and to understand any association with introgressed character. Isozyme pattern in haemolymph of RBLs depicted only one α-amylase of 770 kDa at pH 7.0 and 376 kDa at pH 8.0 with three and four respective β-amylase bands but in bivoltine lines numbers of β-amylase bands vary between 1 to 2 at aforesaid pH. Variability was also observed in digestive juice of multivolitine and its RBLs but bivoltine lines express null activity at both pH except appearance of one very week α-amylase band D6+p at pH 8.5. Overall study suggests that not a single NP at both pH is common for expression of any band of amylase isozyme i.e., a totally different set of proteins are the amylase isozyme expresser at specific pH and no molecular factor of amylase is associated in developed RBLs which showed improvement on survival, single cocoon shell weight (SCSW) and single filament length over receptor parents.
A bio-economic model of two-prey one-predator system
T.K.Kar,S. K. Chattopadhyay,Chandan Kr. Pati 한국전산응용수학회 2009 Journal of applied mathematics & informatics Vol.27 No.5
We propose a model based on Lotka-Volterra dynamics with two competing spices which are affected not only by harvesting but also by the presence of a predator, the third species. Hyperbolic and linear response functions are considered. We derive the conditions for global stability of the system using Lyapunov function. The optimal harvest policy is studied and the solution is derived in the interior equilibrium case using Pontryagin's maximal principle. Finally, some numerical examples are discussed. The nature of variations in the two prey species and one predator species is studied extensively through graphical illustrations. We propose a model based on Lotka-Volterra dynamics with two competing spices which are affected not only by harvesting but also by the presence of a predator, the third species. Hyperbolic and linear response functions are considered. We derive the conditions for global stability of the system using Lyapunov function. The optimal harvest policy is studied and the solution is derived in the interior equilibrium case using Pontryagin's maximal principle. Finally, some numerical examples are discussed. The nature of variations in the two prey species and one predator species is studied extensively through graphical illustrations.