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Puducherry, India

Nayak B.K.,KMCPGS | Amin Bhat M.,Sathyabama University | Nanda A.,Sathyabama University
Materials Science Forum | Year: 2013

Silver Nanoparticles (Ag-NPs) have been known to have inhibitory and bactericidal effects. Resistance to antimicrobial agents by pathogenic bacteria has emerged in recent years and is a major health problem. The ability of some microorganisms such as bacteria and fungi to control the synthesis of metallic Nanoparticles should be employed in the search for new materials. The present work is the study of biosynthesis of silver Nanoparticles synthesized from different Penicillium spp. The Penicillium species were identified by employing microscopic methods and laboratory manuals. The Nanoparticles synthesis was done by extracellular and intracellular methods. The silver Nanoparticles formed were characterized by Uv-vis spectrophotometer followed by TEM analysis. The maximum absorbance 410nm confirmed the formation of silver Nanoparticles and TEM revealed the particle size in the range of 30-40nm, which after confirmation was checked for its antibacterial activity against selected microbial pathogens like Bacillus cereus, Proteus vulgaris, Staphylococcus aureus and Staphylococcus epidermidis. The Nanoparticles synthesized by Penicillium species showed a well anti microbial activity that was further compared with different antibiotics to check the Nanoparticles' activity which can be substituted in place of high dose antibiotics. © (2013) Trans Tech Publications, Switzerland. Source


Krishna Moorthy M.,Sathyabama University | Nayak B.K.,KMCPGS | Nanda A.,Sathyabama University | Anbarasi P.,Avanz Bio Private Ltd
Research Journal of Pharmacy and Technology | Year: 2016

Key criterion for selection of a Probiotic should have the adherence property of bacteria to human epithelial cells and mucosal surface. In this study we assess the adhesion property of selected indigenous probiotic Bacillus subtilis strain by the ability to adhere to human epithelial cells. (Yudhishtir, et, al. 2010) Bacillus subtilis is isolated from fermented plant beverage type coconut toddy, among 137 organisms Bacillus subtilis showed good probiotic characteristics further to its characterization it’s studied for its adhesion property to human epithelial cells. Colonization potential is tested by using CaCo2 and HT29 colonic adenocarcinomal human intestinal epithelial cell lines. Bacillus subtilis strain that adhered to prescribed cell lines was also examined by plating in to the suitable medium by plating them after trypsinization. This colony shows that the isolated Bacillus subtilis has their ability to adhere to epithelial cells and thus this could have better prospects to colonize the gut with extended transit. © RJPT All right reserved. Source


Geetha M.,Periyar University | Senthil Kumar P.,Periyar University | Vasudevan K.,Periyar University | Prakasam A.,Periyar University | And 2 more authors.
Journal of Saudi Chemical Society | Year: 2010

The geometries, electronic structures, polarizabilities, and hyperpolarizabilities of organic dye sensitizer 3,4-pyridinedicarbonitrile was studied based on Hartree-Fock (HF) and density functional theory (DFT) using the hybrid functional B3LYP. Ultraviolet-visible (UV-Vis) spectrum was investigated by time dependent DFT (TD-DFT). Features of the electronic absorption spectrum in the visible and near-UV regions were assigned based on TD-DFT calculations. The absorption bands are assigned to π→π* transitions. Calculated results suggest that the three lowest energy excited states are due to photoinduced electron transfer processes. The interfacial electron transfer between semiconductor TiO2 electrode and 3,4-pyridinedicarbonitrile is due to electron injection process from excited dye to the semiconductor's conduction band. The role of cyanine in 3,4-pyridinedicarbonitrile in geometries, electronic structures, and spectral properties were analyzed. © 2010 King Saud University. Source


UbaidurRahman N.H.,Pondicherry University | Balamurugan C.,Pondicherry University | Mariappan R.,KMCPGS
Procedia Computer Science | Year: 2015

DNA Cryptography is a rapidly emerging field of DNA Computing research to provide invincible cryptographic technique for the modern cyber world of today and the futuristic DNA computers. Several DNA based cryptographic algorithms are proposed for encryption, decryption and authentication, etc. The first and foremost step of DNA based encryption is DNA encoding of plaintext. The main limitation of DNA encoding is the absence of effective, randomized, dynamic, secure DNA Encoding technique for DNA encoding of plaintext. To overcome this limitation, this paper describes a novel DNA encoding algorithm. This encoding algorithm is based on a novel string matrix data structure, for generating the unique DNA sequences that can be used to encode plain text (comprising of alphabets, numbers and special characters) as DNA sequences. The experimental results and comparison results have proved that the proposed DNA encoding algorithm is more effective than the existing DNA encoding algorithms. © 2015 The Authors. Source


UbaidurRahman N.H.,Pondicherry University | Balamurugan C.,Pondicherry University | Mariappan R.,KMCPGS
Procedia Computer Science | Year: 2015

Lot of techniques and systems has been developed based on modular arithmetic cryptography for encryption and decryption. However, these techniques are broken using DNA cryptography techniques and methods. DNA Cryptography is a new instinctive cryptographic field that has emerged from the research of DNA computing. Some algorithms that are available in DNA Cryptography have limitations in that they still use modular arithmetic cryptography at some of their steps or they are biological laboratory experiment based which is not suitable in the digital computing environment. To overcome this lacuna, we describe a novel, secure, unique and dynamic DNA based encryption and decryption algorithm and also provide an analysis of its performance. © 2015 The Authors. Source

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