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    ABSTRACT: A novel series of linear supramolecular hydrogen bonded liquid crystals (SMHBLC) has been investigated. Complimentary hydrogen bonds are formed between various alkyloxy benzoic acids. Formation of hydrogen bond is confirmed by FTIR spectroscopic studies. These homologs exhibit rich phase variance as evinced by various textures by polarizing optical microscopic (POM) studies. DSC studies revealed the transition temperatures and corresponding enthalpy values which are elucidated from the DSC thermograms. Phase diagram has been constructed through POM and DSC data. An interesting finding is the observation of a new smectic ordering labeled as smectic X. This phase has been characterized by various techniques which includes XRD. Optical tilt angle in smectic C and smectic X phases of various homologs has been measured and fitted to a power law. Dielectric relaxations have been carried out in nematic and smectic C phases of different mesogens and their activation energies are calculated. An interesting observation is the optical shuttering action of the mesogens in the nematic phase. In addition to the above phenomenon the light filtering action of these mesogens in the nematic phase has been studied.
    Journal of Molecular Liquids 06/2013; 182:79–90.
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    ABSTRACT: This paper addresses the problem of passivity analysis issue for a class of fuzzy bidirectional associative memory (BAM) neural networks with Markovian jumping parameters and time varying delays. A set of sufficient conditions for the passiveness of the considered fuzzy BAM neural network model is derived in terms of linear matrix inequalities by using the delay fractioning technique together with the Lyapunov function approach. In addition, the uncertainties are inevitable in neural networks because of the existence of modeling errors and external disturbance. Further, this result is extended to study the robust passivity criteria for uncertain fuzzy BAM neural networks with time varying delays and uncertainties. These criteria are expressed in the form of linear matrix inequalities (LMIs), which can be efficiently solved via standard numerical software. Two numerical examples are provided to demonstrate the effectiveness of the obtained results.
    Reports on Mathematical Physics 02/2013; 71(1):69–91.
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    ABSTRACT: Gelatin is an extensively studied biopolymer hydrogel drug carrier due to its biocompatibility, biodegradability and non-toxicity of its biodegraded products formed in vivo. But with the pristine gelatin it is difficult to achieve a controlled and desirable drug release characteristics due to its structural and thermal lability and high solubility in aqueous biofluids. Hence it is necessary to modify its solubility and structural stability in biofluids to achieve controlled release features with improved drug efficacy and broader carrier applications. In the present explorations an effort is made in this direction by cross linking gelatin to different extents using hitherto not studied isocyanate terminated poly(ether) as a macrocrosslinker prepared from poly(ethylene glycol) and isophorone diisocyanate in dimethyl sulfoxide. The crosslinked samples were analyzed for structure by fourier transform-infrared spectroscopy, thermal behavior through thermogravimetric analysis and differential scanning calorimetry. The cross linked gelatins were biodegradable, insoluble and swellable in biofluids. They were evaluated as a carrier for in vitro drug delivery taking theophylline as a model drug used in asthma therapy. The crosslinking of gelatin decreased the drug release rate by 10-20% depending upon the extend of crosslinking. The modeled drug release characteristics revealed an anomalous transport mechanism. The release rates for ampicillin sodium, 5-fluorouracil and theophylline drugs in a typical crosslinked gelatin carrier were found to depend on the solubility and hydrophobicity of the drugs, and the pH of the fluid. The observed results indicated that this material can prove its mettle as a viable carrier matrix in drug delivery applications.
    Saudi Pharmaceutical Journal 01/2013;

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01/2012; 36:975-8887.
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"Recent trends in Fermentation Technology", Dept of Biotechnology ,Vel Tech High Tech Dr.Rangarajan Dr.Sakunthala Engineering College.CHENNAI; 03/2013
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