Volume-4 ~ Issue-3

Abstract: Studies for determination of sulphur functional groups present in Ledo coal of Assam State of North Eastern Region of India were carried out using Temperature Programmed Reduction (TPR) method. TPR studies were carried out in presence of Resorcinol and hydrogen gas to arrive at the final result. TPR studies on model sulphur compounds viz. L-Cysteine, synthetic rubber, Thiokol, having hydroxyl terminal groups, thioplast, pyrite with sand, and Garlic were carried out in order to assign various sulphur functional groups present in Ledo coal. Six numbers of hydrogen sulphide evolutions from Ledo coal were observed in the temperature range of 190 – 2200C, 260 – 2900C, 360 - 3900C, 460 – 4900C, 510 – 5400 C and 590 – 6200C corresponding to mercaptan/ disulphide (0.30), Thiol (1.70), AromaticThioether (0.50), Thiophene (0.90), pyrite + part of complex thiophene (0.60), part of complex thiophene (0.30), The thioketonic sulphur in Ledo coal is estimated to be 1.59 using controlled nitric acid oxidation experiments.

Keywords : Ledo coal, Assam coal, high sulphur coal, model sulphur compounds, TPR, desulphurization, hydro desulphurization, disulphide, Thiol Thioether, Thiophene, Thioketone.

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Abstract: Several studies have highlighted the high prevalence of low Total Testosterone (TT) and Free Testosterone (FT) in men with type 2 diabetes and demonstrated links with visceral adiposity, insulin resistance and HbA₁C. The aim of this study is to evaluate the role of diabetes alone and the association of diabetes and obesity on prevalence of infertility in Iraqi male.

Keywords : Diabetes mellitus, obesity, infertility, free testosterone

[1]. K. Ramesh Babu, K. Yogesh, H.L. Raghavendra, S.M. Kantikar and K.B. Prakash: Antidiabetic and histopathological analysis of fenugreek extract on alloxan induced diabetic rat, International Journal of Drug Development & Research, 2010, 10-13.
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Abstract: The Schiff base complexes of Co(II), Ni(II) Cu(II) and Zn(II) have been synthesized from 4- pyridine carboxaldehyde with 4-aminopyridine. They have been characterized by elemental analysis, molar conductance, molecular weight determination, IR, XRD and SEM. The metal in the Schiff base complex is hexa coordinated which binds through pyridine nitrogen, azomethine nitrogen and nitrate units of metal salt used in the preparation. The antimicrobial and cleavage activity have also been studied for the synthesized compounds. The Schiff base and its metal complexes show a good activity against the bacteria Staphylococcus aureus, E.coli, Klebsiella, Pneumonia and fungi like Candida albicans, Apergillus niger and Pencillium sp. The antimicrobial results also indicate that the metal complexes are better antimicrobial agents as compared to the Schiff base.

Key words: 4-aminopyridine, 4-pyridinecarboxaldehyde, Antimicrobial activity, Nuclease activity Spectral studies.

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Abstract: An experimental investigation was conducted to study the performance of fly ash based geopolymer specimens in Sodium Aluminium Phosphate solution. High strength geopolymer is produced from coal combustion fly ash and sodium aluminium phosphate chemical which can be obtained by hydrated alumina powder reacting with ortho phosphoric acid and sodium hydroxide. The curing is done by both atmospheric and accelerated means. Performance of the specimens was evaluated in terms of visual appearance, change in compressive strength, phase development and micro-structural analysis over the exposure period of time. Evidence is provided with micro structural studies and mechanical strength properties on the presence of amorphous binding phase. These characteristics are similar to alumino-silicate geopolymer.

Keywords: Fly ash, geopolymer, Phosphate ions, compressive strength

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