Salem, India
Salem, India

Periyar University is a university located in Salem, Tamil Nadu, India. It was established by the Government of Tamil Nadu in 1997. The university is named after a social reformer Thanthai Periyar. The University Grants Commissions, New Delhi bestowed the 2f status in 1998 and 12 status in 2005 to the university. The university is accredited with NAAC. Wikipedia.

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Buvaneswari N.,Periyar University | Kannan C.,Manonmaniam Sundaranar University
Journal of Hazardous Materials | Year: 2011

Effluents releasing from dyeing industries directly affect the soil, water, plant and human life. Among these dyes, plant poisoning, soil polluting and water polluting nature of organic dyes are not yet identified. The plant poisoning and non-poisoning organic dyes are identified through adsorption mechanism of cationic malachite green (MG) and anionic methyl orange (MO) on brinjal plant root powder (cellulose). The positive ΔHo (44kJmol-1) of MG higher than 40kJmol-1 confirmed the adsorption of MG on cellulose is chemisorption and the negative ΔHo (-11kJmol-1) less than 40kJmol-1 showed that the adsorption of MO on cellulose is physisorption. The ΔGo values for the adsorption of MG and MO on BPR are not much increased with increase of temperature which indicated that the adsorption is independent of the temperature. The entropy change for the adsorption of MG and MO has proved that the MG (+ΔSo) has less disorder at the adsorption interface and MO (-ΔSo) has the high disorder at the adsorption interface. The recovery of both dyes has been studied in water at 80 °C on BPR surface and observed that the MO recovery is 95% and MG is 10%. The poor desorption of MG is due to the strong chemisorption on BPR (cellulose) surface proves its plant poisoning nature. The high recovery of MO due to physisorption mechanism proves that MO is not poisoning the plant. © 2011 Elsevier B.V.

Raja R.,Periyar University | Samidurai R.,Thiruvalluvar University
Journal of the Franklin Institute | Year: 2012

This paper is concerned with the stability analysis problem for a class of delayed stochastic recurrent neural networks with both discrete and distributed time-varying delays. By constructing a suitable Lyapunov-Krasovskii functional, a linear matrix inequality (LMI) approach is developed to establish sufficient conditions to ensure the global, robust asymptotic stability for the addressed system in the mean square. The conditions obtained here are expressed in terms of LMIs whose feasibility can be checked easily by MATLAB LMI Control toolbox. In addition, two numerical examples with comparative results are given to justify the obtained stability results. © 2012 The Franklin Institute. All rights reserved.

Rajesh K.B.,Anna University | Jaroszewicz Z.,Institute of Applied Optics | Anbarasan P.M.,Periyar University
Optics Express | Year: 2010

The focal field of high NA lens axicon with a binary-phase optical component is calculated by using vector diffraction theory. Numerical results show that for a radially polarized Bessel Gaussian input field, the proposed system generates a subwavelength (0.395λ) longitudinally polarized beam with large uniform depth of focus (approximately 6 λ). © 2010 Optical Society of America.

Thiyagarajan M.,Periyar University | Venkatachalam P.,Periyar University
Industrial Crops and Products | Year: 2012

Stevia rebaudiana is a valuable medicinal plant species and it is being used for the treatment of diabetes. Currently, there is a high demand for raw material of this medicinal herb due to ever increasing diabetes disorder among the population. In order to meet the increased demand an efficient in vitro propagation of S. rebaudiana was established. Nodal explants collected from the field were cultured on MS basal medium fortified with different concentrations of BAP (0.5-3.0. mg/l) and KIN (0.5-3.0. mg/l) individually for shoot bud induction. In vitro derived nodal buds were cultured on MS medium supplemented with different concentrations (0.5-3.0. mg/l) of BAP and KIN for multiple shoot bud regeneration. In the second experiment, in vitro derived buds were placed on MS medium supplemented with different concentrations of BAP (0.5-3.0. mg/l) in combination with 0.5. mg/l IAA or IBA or NAA for shoot bud multiplication. The highest frequency (94.50%) of multiple shoot regeneration with maximum number of shoots (15.69 shoots/explant) was noticed on MS medium supplemented with 1.0. mg/l BAP. For large scale plant production, in vitro derived nodal bud explants were cultured on MS medium fortified with 1.0. mg/l BAP, in which about 123 shoots/explant were obtained after three subcultures on the same media composition. Elongated shoots (>2. cm) dissected out from the in vitro proliferated shoot clumps were cultured on half-strength MS medium containing different concentrations of NAA (0.1-0.5. mg/l) and/or MS medium fortified with various concentrations (0.5-2.0. mg/l) of auxins (NAA, IAA and IBA) for root induction. Highest frequency of rooting (96%) was noticed on half-strength MS medium augmented with 0.4. mg/l NAA. The rooted plantlets were successfully transferred into plastic cups containing sand and soil in the ratio of 1:2 and subsequently established in the greenhouse. The present in vitro propagation protocol would facilitate an alternative method for rapid and large-scale production of this important antidiabetic medicinal plant. © 2011 Elsevier B.V.

Krishnaveni M.,Periyar University
Asian Journal of Pharmaceutical and Clinical Research | Year: 2014

Objective: The main objective of this study is to assess the secondary metabolites and antioxidant activities of Terminalia catappa nut as it is not a commercialized nut. Materials and Methods: The secondary metabolites and antioxidant activities were experimented by adopting recommended standard procedures using aqueous extract of T. catappa nut powder 25, 50, 75, 100 mg. Results: The total phenolics content was higher on comparison with flavonoid content. Similarly, among the antioxidant activities, nitric oxide scavenging (257.33±2.30 mg/g) as well as reducing power activity (142.66±6.11 mg/g) was higher compared with total antioxidant (82.66±6.11 mg/g) and metal chelating activity (64.66±2.30 mg/g). Conclusion: The results obtained shows that it contained phenolics and flavonoid, which in turn induces antioxidant activities. Hence, this might act as a potential antioxidant, and needs further characterization and purification. © 2014 Asian Journal of Pharmaceutical and Clinical Research. All rights reserved.

Sathishkumar P.,Chonbuk National University | Arulkumar M.,Periyar University | Palvannan T.,Periyar University
Journal of Cleaner Production | Year: 2012

Jatropha curcas is a non-edible oil crop predominately used to produce biodiesel. J. curcas pod contains 80% as dried vegetable and remaining 20% are seeds that are used for the biodiesel production in industries. In the present study, J. curcas pods were used for activated carbon preparation and successfully employed as adsorbent for the removal of reactive dye, Remazol Brilliant Blue R (RBBR). Batch adsorption experiments were performed as a function of contact time, pH, adsorbent dosage and initial dye concentration. The experimental results indicate that 0.2 g of activated carbon removed 95% of 50 mg L-1 dye. Adsorption data were modeled using the Langmuir and Freundlich isotherms. Langmuir isotherm was obeyed for the adsorption. Equilibrium parameter value (RL) was observed to be in the range of 0-1. The dye adsorption followed the pseudo-first-order kinetics model with regard to the intraparticle diffusion rate. Physico-chemical properties of activated carbon were analyzed by SEM, FTIR and XRD before and after dye adsorption. The adsorbed dye from activated carbon was successfully desorbed (80%) by 1 N NaOH. Bench scale removal of RBBR dye as well as real textile effluent was carried out by J. curcas pods activated carbon (JCPAC). This option will make the agro-industrial waste JCPAC adopted in textile industrial effluent treatment for environmental cleansing. © 2011 Elsevier Ltd. All rights reserved.

Chitosan (CS)-polylacticacid (PLA)-polyethylene glycol (PEG)-gelatin (G) nanoparticles, a novel drug vehicle for the controlled release of an antitubercluosis drug, rifampicin (RIF) was developed and its chemical and biochemical activities were studied by various standard methods. The designed carriers CS, PEG and G nanoparticles were prepared by emulsion solvent evaporation technique, and then used for entrapping RIF. Linking was confirmed by FTIR spectroscopy. The surface morphology of the nanoparticles was studied using scanning electron microscope and polarizing microscope. The influence of process variables, on particle size, zeta potential and matrix entrapment of RIF was studied. The encapsulation and loading capacity were evaluated, and an in vitro release of RIF was assessed using the dialysis method. The effect of nanoencapsulation of RIF on the antibacterial activity of RIF against Mycobacterium strains was evaluated. The preliminary results clearly suggested that the cross linked CS-PLA-PEG-G matrix may be a potential polymeric carrier for controlled delivery of RIF. © 2013 Published by Elsevier Ltd.

Revathy K.,Periyar University | Lalitha A.,Periyar University
RSC Advances | Year: 2014

An efficient method for the synthesis of spirooxindolopyrrolizidine/ spirooxindolothiapyrrolizidine by the 1,3-dipolar cycloaddition of azomethine ylides generated via, decarboxylative condensation of 1,2-dicarbonyl compounds and l-proline/l-thiaproline/sarcosine with chalcones at ambient conditions with excellent yields has been described. © 2014 The Royal Society of Chemistry.

Palvannan T.,Periyar University | Sathishkumar P.,Periyar University
Journal of Basic Microbiology | Year: 2010

Statistically-based experimental designs were applied to optimize the fermentation for the production of laccase by Pleurotus florida NCIM 1243. Eleven components were screened for their significant effect on laccase production using Plackett-Burman factorial design. Glucose (carbon source), asparagine (nitrogen source), CuSO4 (inducer) and incubation period were found to have highest positive influence on the laccase production. The combined effect of these factors on laccase production was studied using central composite design of Response surface methodology. The optimal point of variables for maximum laccase production using Response surface methodology are glucose (15.21 g/l), asparagine (6.40 g/l), CuSO4 (91.78 μM) and incubation period (178.55 h), respectively. The maximum enzyme activity predicted by the model was 5.0 U/ml which was in perfect agreement with the actual experimental value (4.8 U/ml). Further, partially purified laccase from the optimized cultural condition was used for the decolorization of reactive dyes, Reactive Blue 198 and Reactive Red 35. © 2010 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Arulkumar M.,Periyar University | Sathishkumar P.,Periyar University | Palvannan T.,Periyar University
Journal of Hazardous Materials | Year: 2011

Thespesia populnea is a large tree found in the tropical regions and coastal forests of India. Its pods were used as a raw material for the preparation of activated carbon. The prepared activated carbon was used for the adsorptive removal of Orange G dye from aqueous system. The effects of various parameters such as agitation time, initial dye concentration and adsorbent dosage were studied using response surface methodology (RSM). RSM results show that 0.54g of activated carbon was required for the maximum adsorption of Orange G dye (17.6mgL-1) within a time period of 4.03h. Adsorption data were modeled using Freundlich and Langmuir adsorption isotherms. The adsorption of Orange G dye by activated carbon obeyed both Fruendlich and Langmuir isotherm. Adsorption kinetic data were tested using pseudo-zero, first, second-order and intraparticle diffusion models. Kinetic studies revealed that the adsorption followed pseudo-second-order reaction with regard to the intraparticle diffusion. FTIR spectral result indicated all the functional group except primary amines (3417cm-1) and CN (1618cm-1) were involved in the adsorption process. XRD data showed that Orange G dye adsorbed activated carbon might not induce the bulk phase changes. SEM results showed that the surface of the activated carbon was turned from dark to light color after dye adsorption. © 2010 Elsevier B.V.

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