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Kottayam, India

Cyriac J.,Mahatma Gandhi University | Cyriac J.,Devamatha College | Rahul M.T.,Mahatma Gandhi University | Kalarikkal N.,Mahatma Gandhi University | Nambissan P.M.G.,Saha Institute of Nuclear Physics
Journal of Physics: Conference Series

Positron lifetime (PL) and coincidence Doppler broadening spectroscopic (CDBS) experiments were carried out on BiFeO3 samples doped with Pr(in place of Bi) in concentrations (x) = 0, 0.05, ⋯, 0.35. In the initial stages of doping, the existing Bi3+ vacancies are occupied by Pr3+ ions and positron trapping is reduced. From x = 0.15 to 0.35, more number of positrons diffused to the surfaces of the nanocrystallites. The CDBS ratio curves showed enhancement of the peak at pL = 10.2×10-3 m0c due to positron annihilation with the 2p electrons of oxygen. It suggested increased trapping of positrons in newly created cationic vacancy-type defects due to the mismatch of ionic radii of Pr3+ substituting Bi3+ ions. The lattice parameters decreased (3.9661-3.9248Å) while the nanocrystallitesizes reduced and increased (28.6-34.2nm) during the doping. © Published under licence by IOP Publishing Ltd. Source

Sharma M.,University of Rajasthan | Mohan V.,University of Rajasthan | Abraham M.,Devamatha College
African Journal of Biotechnology

The emergence of drug resistant pathogens is becoming a serious threat to humanity and has necessitated the search for new antimicrobial drugs. The present study was done to evaluate the potential antimicrobial efficacy of some common members of Nictagenaceae against four bacterial strains; Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Proteus vulgaris. Different concentrations of Soxhlet extracts (aqueous, petroleum ether and ethyl alcohol) of the plants in different solvents were tested by standard filter paper disk diffusion method. The efficacy of the extracts determined from the zone of inhibition was compared with that of two common antibiotics (amphicillin and erythromycin). The minimum inhibitory concentration (MIC) values of the extracts were also determined from most efficient extracts. The selected plant extracts exhibited good antibacterial activity. The crude phytoextracts showed high degree of antimicrobial activity and confirms the traditional therapeutic claims of these plants. The results confirm that the plant extracts have great potential as antimicrobial compounds against microorganisms. Thus, they can be used in the treatment of infectious diseases caused by resistant microbes. © 2010 Academic Journals. Source

The present studywas carried out to evaluate the effect of different concentrations of the treated centrifugal rubber latex factory effluent on protein content in Vigna unguiculata L.Walp. and Abelmoschus esculentus (L.) Moench. The increasing demand of irrigation water leads to research exploring the viable alternatives. The present study also aimed in this direction. The physico-chemical analysis of the effluent indicated its acidic nature as well as presence of appreciable amount of dissolved solids, suspended solids, ammoniacal nitrogen, total nitrogen, sulphate and potassium together with high BOD and COD. Different dilutions of the effluent such as 25, 50, 75% and undiluted effluent were used for treatment. The results indicated that there is amarked differencein the response of these two genotypes to effluent treatment. Abelmoschus esculentus is tolerant and the treatment showed a favourable result with respect to protein, as evidenced by a high amount of protein treated population. In Vigna unguiculata the protein content showed reduction in all the treated population. Thestudy recommended that after proper dilution the effluent can be used as an effective source of irrigation water. Source

Sharma M.,University of Rajasthan | Mohan V.,University of Rajasthan | Abraham M.,Devamatha College | Joshy P.J.,Devamatha College | Reghuvaran D.K.,Devamatha College
Journal of Medicinal Plants Research

Members of Meliaceae are widely used by different tribal communities in South India for the treatment of many bacterial and fungal diseases. In this context, antimicrobial potential of aqueous and alcoholic soxhlet extracts of leaf, stem/bark and root of Azadirachta indica, Naregamia alata and Swietenia mahagoni against five bacterial strains was studied to validate the ethno therapeutic claims of these plants against different bacterial diseases. The alcoholic and aqueous extracts of the plants showed significant antibacterial activity against all the organisms: Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa Proteus vulgaris and Bacillus subtilis. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) (mg/ml) of the alcoholic and aqueous extracts were also determined. The antibacterial potential of the plants were then compared with Benzyl Penicillin and Amphicillin, two common antibiotics employed in allopathic treatment of bacterial diseases. The alcoholic extracts of plants proved to be more effective than the aqueous extracts due to broad spectrum antibiotic compounds. The good antibacterial potency of the plants indicates the presence of some active principle in the phytoextracts, which can be purified and employed in the treatment of bacterial diseases as an alternative to the costly antibiotics. © 2011 Academic Journals. Source

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