Nagarajan S.,SASTRA University
Applied Biochemistry and Biotechnology | Year: 2012
Fat-splitting enzymes (lipases), due to their natural, industrial, and medical relevance, attract enough attention as fats do in our lives. Starting from the paper that we write, cheese and oil that we consume, detergent that we use to remove oil stains, biodiesel that we use as transportation fuel, to the enantiopure drugs that we use in therapeutics, all these applications are facilitated directly or indirectly by lipases. Due to their uniqueness, versatility, and dexterity, decades of research work have been carried out on microbial lipases. The hunt for novel lipases and strategies to improve them continues unabated as evidenced by new families of microbial lipases that are still being discovered mostly by metagenomic approaches. A separate database for true lipases termed LIPABASE has been created recently which provides taxonomic, structural, biochemical information about true lipases from various species. The present review attempts to summarize new approaches that are employed in various aspects of microbial lipase research, viz., screening, isolation, production, purification, improvement by protein engineering, and surface display. Finally, novel applications facilitated by microbial lipases are also presented. © Springer Science+Business Media, LLC 2012.
Chandiramouli R.,SASTRA University
Ceramics International | Year: 2014
The electronic transport properties of cadmium sulfide nanoribbon based molecular device were investigated by employing first principles calculation using density functional theory. The electronic properties are discussed in terms of density of states spectrum and electron density. The density of states of charge depends on the applied bias voltage. The electron density is seen more at cadmium sites. The transport properties of CdS nanoribbon are studied using transmission coefficient spectrum and transmission pathways. The electronic transmission all along the scattering region depends on the bias voltage; depending upon the bias voltage the transmission path also gets altered. The information provided in the present study will pave way to tailor nanostructures with improved performance in nanoelectronic devices. © 2014 Elsevier Ltd and Techna Group S.r.l.
Anthony S.P.,SASTRA University
ChemPlusChem | Year: 2012
Organic fluorescent materials have been an integral part of recently emerged optoelectronic device technologies owing to their good photophysical properties such as high quantum yields and significant photostability In particular, switchable and tunable solid-state fluorescence has attracted increasing attention in recent years both in the field of fundamental research and industrial applications. Unlike in solution, fluorescence in the solid state is a collective phenomenon of molecules that are commonly modulated through controlling molecular packing and the electronic conjugation of fluorophores. Several strategies, including chemical modification, have been developed to alter the fluorophore molecular arrangement in the solid state. This Review article describes the various strategies that have been effectively utilised to achieve switchable and tunable fluorescence in the organic solid state. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.
Suribabu C.R.,SASTRA University
Journal of Hydroinformatics | Year: 2010
Water distribution networks are considered as the most important entity in the urban infrastructure system and need huge investment for construction. The inherent problem associated with cost optimisation in the design of water distribution networks is due to the nonlinear relationship between flow and head loss and availability of the discrete nature of pipe sizes. In the last few decades, many researchers focused on several stochastic methods of optimisation algorithms. The present paper is focused on the Differential Evolution algorithm (henceforth referred to as DE) and utilises a similar concept as the genetic algorithm to achieve a goal of optimisation of the specified objective function. A simulation-optimisation model is developed in which the optimization is done by DE. Four well-known benchmark networks were taken for application of the DE algorithm to optimise pipe size and rehabilitation of the water distribution network. The findings of the present study reveal that DE is a good alternative to the genetic algorithm and other heuristic approaches for optimal sizing of water distribution pipes. © IWA publishing 2010.
Hariharan G.,SASTRA University
Journal of Mathematical Chemistry | Year: 2013
In this paper, the Homotopy analysis method (HAM) is employed to obtain the analytical/numerical solutions for linear and nonlinear Kolmogorov Petrovskii-Piskunov (KPP) and fractional KPP equations. The proposed method is a powerful and easy-to-use analytical tool for linear and nonlinear problems. This method contains the auxiliary parameter h, which provides us with a simple way to adjust and control the convergence region of solution series. Some illustrative examples are presented. Moreover the use of HAM is found to be accurate, simple, convenient, flexible and computationally attractive. © 2012 Springer Science+Business Media New York.