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Articles by Ujjwal Neogi
Total Records ( 2 ) for Ujjwal Neogi
  Sharanu S. Biradar , N. Rajendra Goud , Ujjwal Neogi and Ruchi Saumya
  Aeromonas hydrophila, gram negative facultative anaerobic short bacillus, causes red fin disease, haemorrhagic septicemia, motile aeromonad septicemia and other infections in Carassius auratus. Multiple drug resistance of some strains of A. hydrophila presents a major threat in the control these diseases. Recently much attention has been paid to extracts and biologically active compounds isolated from plant species. In this studies ten plants leaves were assayed against Aeromonas hydrophila both in vitro and in vivo. The effective plant was found to be Phyllanthus emblica which shows the 24 mm zone diameter which was the nearest to oxytetracyclin and further choose for the in vivo study. Tagetes erect, Azadirachta indica, Calotropis procera also showed nearer activity nearer to the control antibiotic. There were no effect of Momordica charantia, Achyranthes aspera, Centella asiatica on aeromonads disease as the solvent alcohol solely gave the zone diameter of 14 mm. When incorporated P. emblica leaf extract in infected gold fish at a dose of 25 mg g-1 of body weight, the A. hydrophila infection was cured within 12-15 days under laboratory condition.
  Ujjwal Neogi
  The purpose of this study was to evaluate the bactericidal activity of some commercially available disinfectants against hospital bacterial isolates. The organism, Pseudomonas aeruginosa, was irradiated for 4 min for the induced mutation and the susceptibility to disinfectants like cetrimide, tincture of iodine, phenol, sodium hypochlorite, alcohol and chlorhexidine gluconate were checked against the wild type culture. The uvrB gene mutation in P. aeruginosa may lead the opportunistic pathogen to more infectious. The effect of various disinfectants varies with the type of disinfectants, dose of irradiation and density of the culture and concentration of the disinfectants. Sodium hypochlorite, alcohol, phenol had more lethal to wild type. The bactericidal effect was found to be in a range of 4-8 mg mL-1. Cetrimide had great lethality to the both wild type and irradiated one. The effect was found at 2 mg mL-1. Iodine was more effective to wild type (2 mg mL-1) but irradiated one was more resistant even in high concentrations. There was no such effect of chlorhexidine gluconate on both the strain and more growth to be occurred at high concentration. It was further confirmed that gluconate present in the disinfectant was used by the organism as a carbon source.
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