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K. Geetha,P. Gunasekaran 한국생물공학회 2010 Biotechnology and Bioprocess Engineering Vol.15 No.5
We aimed to optimize a nutrient medium containing agricultural waste for xylanase production by Bacillus pumilus B20. Xylanase production with lignocellulosic material was optimized in two steps using DeMeo’s fractional factorial design. A 3.4-fold increase in xylanase production (313.3 U/mL) was achieved using the optimized culture medium consisting of (g/L): K2HPO4, 2;MgSO4·7H2O, 0.3; CaCl2·2H2O, 0.01; NaCl, 2; peptone, 5;yeast extract, 4; and wheat bran, 50. B. pumilus B20 produced a high level of xylanase, which may have potential industrial application.
P. Malathy, G. Jagadeesan, K. Gunasekaran, and S. Aravindhan 조선대학교 기초과학연구원 2016 조선자연과학논문집 Vol.9 No.4
Filariasis causing nematode Brugia malayi is shown to harbor wolbachia bacteria as symbionts. The sequenced genome of the wolbachia endosymbiont from B.malayi (wBm) offers an unprecedented opportunity to identify new wolbachia drug targets. Hence the enzyme carbonic anhydrase from wolbachia endosymbiont of Brugia malayi (wBm) which is responsible for the reversible interconversion of carbon dioxide and water to bicarbonate and protons (or vice versa) is chosen as the drug target for filariasis. This enzyme is thought to play critical functions in bacteria by involving in various steps of their life cycle which are important for survival, The 3D structure of wBm carbonic anhydrase is predicted by selecting a suitable template using the similarity search tool, BLAST. The BLAST results shows a hexapeptide transferase family protein from Anaplasma phagocytophilum (PDB ID: 3IXC) having 77% similarity and 54% identity with wBm carbonic anhydrase. Hence the above enzyme is chosen as the template and the 3D structure of carbonic anhydrase is predicted by the tool Modeller9v7. Since the three dimensional structure of carbonic anhydrase from wolbachia endosymbiont of Brugia malayi has not yet solved, attempts were made to predict this protein. The predicted structure is validated and also molecular docking studies are carried out with the suitable inhibitors that have been solved experimentally. Keywords: Carbonic Anhydrase, Filariasis, Wolbachia of Brugia Malayi (wBm), Induced Fit Docking, Endosymbiotic.
Finite Time H∞ Boundedness of Discrete-time Markovian Jump Neural Networks with Time-varying Delays
M. Syed Ali,K. Meenakshi,N. Gunasekaran 제어·로봇·시스템학회 2018 International Journal of Control, Automation, and Vol.16 No.1
This paper is concerned with the problem of finite-time H∞ boundedness of discrete-time Markovian jumping neural netwoks with time-varying delays. A new sufficient condition is presented which guarantees the stability of the closed-loop system and the same time maximizes the boundedness on the non-linearity. An extension of fixed transition probability Markovian model is combined to time-varying transition probabilities has offered. By constructing a novel Lyapunov - Krasovskii functional, the system under consideration is subject to interval timevarying delay and norm-bounded disturbances. Linear matrix inequality approach is used to solve the finite-time stability problem. Numerical example is given to illustrate the effectiveness of the proposed result.
M. Syed Ali,K. Meenakshi,N. Gunasekaran 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.6
The problem of finite-time H∞ performance of discrete time neural network with norm-bounded disturbancesand time varying delays is studied in this paper. By constructing a delay-dependent Lyapunov-Krasovskiifunctional and using a two-term approximation of the time-varying delay, sufficient conditions of finite-time stabilityare derived and expressed in terms of linear matrix inequalities (LMIs). The derived stability conditions canbe applied into analyzing the finite-time stability and deriving the maximally tolerable delay. Comparision withthe existing results given to show that, the derived stability conditions are less conservative. Finally, numericalexamples are provided to illustrate the effectiveness of the proposed method.
Malathy, P.,Jagadeesan, G.,Gunasekaran, K.,Aravindhan, S. The Basic Science Institute Chosun University 2016 조선자연과학논문집 Vol.9 No.4
Filariasis causing nematode Brugia malayi is shown to harbor wolbachia bacteria as symbionts. The sequenced genome of the wolbachia endosymbiont from B.malayi (wBm) offers an unprecedented opportunity to identify new wolbachia drug targets. Hence the enzyme carbonic anhydrase from wolbachia endosymbiont of Brugia malayi (wBm) which is responsible for the reversible interconversion of carbon dioxide and water to bicarbonate and protons (or vice versa) is chosen as the drug target for filariasis. This enzyme is thought to play critical functions in bacteria by involving in various steps of their life cycle which are important for survival, The 3D structure of wBm carbonic anhydrase is predicted by selecting a suitable template using the similarity search tool, BLAST. The BLAST results shows a hexapeptide transferase family protein from Anaplasma phagocytophilum (PDB ID: 3IXC) having 77% similarity and 54% identity with wBm carbonic anhydrase. Hence the above enzyme is chosen as the template and the 3D structure of carbonic anhydrase is predicted by the tool Modeller9v7. Since the three dimensional structure of carbonic anhydrase from wolbachia endosymbiont of Brugia malayi has not yet solved, attempts were made to predict this protein. The predicted structure is validated and also molecular docking studies are carried out with the suitable inhibitors that have been solved experimentally.