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  • 1
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    Studies on Biosorption of Methylene Blue from Aqueous Solutions by Powdered Palm Tree Flower (Borassus flabellifer) (2014)
    Hindawi
    Details
    Publication Date: 2014-02-03
    Description: Biosorption experiments were carried out for the removal of methylene blue (MB) using palm tree male flower (PTMF) as the biosorbent at various pH, temperature, biosorbent, and adsorbate concentration. The optimum pH was found to be 6.0. The kinetic data were fitted in pseudofirst-order and second-order models. The equilibrium data were well-fitted in Langmuir isotherm and the maximum equilibrium capacities of the biosorbent were found to be 143.6, 153,9, 157.3 mg/g at 303, 313, and 323 K, respectively. Thermodynamic data for the adsorption system indicated spontaneous and endothermic process. The enthalpy and entropy values for adsorption were obtained as 15.06 KJ/mol and 0.129 KJ/mol K, respectively, in the temperature range of 303–323 K. A mathematical model for MB transported by molecular diffusion from the bulk of the solution to the surface of PTMF was derived and the values of liquid phase diffusivity and external mass transfer coefficient were estimated.
    Print ISSN: 1687-806X
    Electronic ISSN: 1687-8078
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Hindawi
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  • 2
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    Studies on Biosorption of Methylene Blue from Aqueous Solutions by Powdered Palm Tree Flower (Borassus flabellifer) (2014)
    Hindawi
    Details
    Publication Date: 2014-01-01
    Description: Biosorption experiments were carried out for the removal of methylene blue (MB) using palm tree male flower (PTMF) as the biosorbent at various pH, temperature, biosorbent, and adsorbate concentration. The optimum pH was found to be 6.0. The kinetic data were fitted in pseudofirst-order and second-order models. The equilibrium data were well-fitted in Langmuir isotherm and the maximum equilibrium capacities of the biosorbent were found to be 143.6, 153,9, 157.3 mg/g at 303, 313, and 323 K, respectively. Thermodynamic data for the adsorption system indicated spontaneous and endothermic process. The enthalpy and entropy values for adsorption were obtained as 15.06 KJ/mol and 0.129 KJ/mol K, respectively, in the temperature range of 303–323 K. A mathematical model for MB transported by molecular diffusion from the bulk of the solution to the surface of PTMF was derived and the values of liquid phase diffusivity and external mass transfer coefficient were estimated.
    Print ISSN: 1687-806X
    Electronic ISSN: 1687-8078
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Hindawi
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  • 3
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    Synthesis and Oral Hypoglycemic Activity of 3-[5'-Methyl-2'-aryl-3'-(thiazol-2ʺ-yl amino) thiazolidin-4'-one]coumarin Derivatives (2011)
    Hindawi
    Details
    Publication Date: 2011-01-01
    Description: Number of heterocyclic compounds has been exploited to develop pharmaceutically important molecules, out of which biheterocyclic coumarins are clinically used potential drug candidates showing oral hypoglycemic and antidiabetic activities. A new series of 3-[5'-methyl-2'-aryl-3'-(thiazol-2ʺ-yl amino)thiazolidin-4'-one]coumarin derivatives were designed and synthesized. The title compounds were synthesized from starting material 3- acetyl coumarin. All the synthesized compounds were characterized and screened for hypoglycemic activity. Some of the compounds exhibited promising activity.
    Electronic ISSN: 0973-4945
    Topics: Chemistry and Pharmacology
    Published by Hindawi
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  • 4
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    Microwave Assisted Liquid Phase Synthesis of Benzimidazolo Benzothiophenes for Antimicrobial Activity (2009)
    Hindawi
    Details
    Publication Date: 2009-01-01
    Description: Benzimidazolo benzothiophene derivatives were prepared by liquid phase combinatorial synthesis using soluble polymer support PEG 5000 and 4-fluoro-3-nitrobenzoic acid as starting materials with substituted primary amines. All these synthesized compounds were established by the spectral data and tested for antimicrobial activity against gram positive bacteria,i.e. S. aureus, B. subtilisand gram negative bacteria,E.coliandP.aeruginosaand anti fungal activity againstC. albicans. Ampicillin and ciprofloxacin were used as standard for antibacterial activity and cotrimoxazole for anti fungal activity. Compared with standards compounds(1a-h)showed significant activity against bacterial species and1gshowed significant activity against fungal species.
    Electronic ISSN: 0973-4945
    Topics: Chemistry and Pharmacology
    Published by Hindawi
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  • 5
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    A Novel Framework for Ab Initio Coarse Protein Structure Prediction (2018)
    Hindawi
    Details
    Publication Date: 2018-06-20
    Description: Hydrophobic-Polar model is a simplified representation of Protein Structure Prediction (PSP) problem. However, even with the HP model, the PSP problem remains NP-complete. This work proposes a systematic and problem specific design for operators of the evolutionary program which hybrids with local search hill climbing, to efficiently explore the search space of PSP and thereby obtain an optimum conformation. The proposed algorithm achieves this by incorporating the following novel features: (i) new initialization method which generates only valid individuals with (rather than random) better fitness values; (ii) use of probability-based selection operators that limit the local convergence; (iii) use of secondary structure based mutation operator that makes the structure more closely to the laboratory determined structure; and (iv) incorporating all the above-mentioned features developed a complete two-tier framework. The developed framework builds the protein conformation on the square and triangular lattice. The test has been performed using benchmark sequences, and a comparative evaluation is done with various state-of-the-art algorithms. Moreover, in addition to hypothetical test sequences, we have tested protein sequences deposited in protein database repository. It has been observed that the proposed framework has shown superior performance regarding accuracy (fitness value) and speed (number of generations needed to attain the final conformation). The concepts used to enhance the performance are generic and can be used with any other population-based search algorithm such as genetic algorithm, ant colony optimization, and immune algorithm.
    Print ISSN: 1687-8027
    Electronic ISSN: 1687-8035
    Topics: Biology , Computer Science
    Published by Hindawi
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