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Articles by G. Karthikeyan
Total Records ( 3 ) for G. Karthikeyan
  L. Rajendran , G. Karthikeyan , T. Raguchander and R. Samiyappan
  In this study, for the management of Basal Stem Rot (BSR) disease sixty endophytic, rhizosphere strains were isolated from coconut, other crops and virgin soils. The strains showed high growth promotion were subjected to Ganoderma mycelium inhibition study in vitro. The strains EPC5 and EPC8 were showed high growth promotion and strong inhibition to Ganoderma pathogen compared to other strains. Both the strains were characterized by biochemical methods and confirmed as Bacillus. The Bacillus ITS region was amplified by specific primers and EPC5, EPC8 showed amplification of 546 bp products in size. Further, the strains were cloned and sequenced, deposited in NCBI, USA. The sequence showed similarity with Bacillus subtilis.
  L. Rajendran , G. Karthikeyan , T. Raguchander and R. Samiyappan
  G. Karthikeyan and S. Siva Ilango
  Batch adsorption experiments using activated carbon prepared from Morringa Indica bark were conducted to remove fluoride from aqueous solution. A minimum contact time of 25 min was required for optimum fluoride removal. The influence of adsorbent, dose, pH, co-ions (cations and anions) on fluoride removal by the activated carbon has been experimentally verified. The adsorption of fluoride was studied at 30 °C, 40 °C and 50 °C. The kinetics of adsorption and adsorption isotherms at different temperatures were studied. The fluoride adsorption obeyed both Langmuir and Freundlich isotherms and followed a pseudo first order kinetic model. The thermodynamic studies revealed that the fluoride adsorption by Morringa Indica is an endothermic process indicating an increase in sorption rate at higher temperatures. The negative values of ΔG0 indicate the spontaneity of adsorption. SEM and XRD studies confirmed the surface morphological characteristics of the adsorbent and the deposition of fluoride on the surface of the material.
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