Metal nanoparticle synthesis is an interesting area in nanotechnology due to their remarkable optical, magnetic, electrical, catalytic and biomedical properties, but there needs to develop clean, non-toxic and environmental friendly methods for the synthesis and assembly of nanoparticles. Biological agents in the form of microbes have emerged up as efficient candidates for nanoparticle synthesis due to their extreme versatility to synthesize diverse nanoparticles with varying size and shape. In the present study, an eco favorable method for the biosynthesis of silver nanoparticles using marine bacterial isolate has been attempted. Very interestingly, molecular identification proved it as a strain of Ochrobactrum anhtropi. In addition, the isolate was found to have the potential to form silver nanoparticles intracellularly at room temperature within 24 h. The biosynthesized silver nanoparticles were characterized by UV-Vis spectroscopy, transmission electron microscope (TEM) and scanning electron microscope (SEM). The UV-visible spectrum of the aqueous medium containing silver nanoparticles showed a peak at 450 nm corresponding to the plasmon absorbance of silver nanoparticles. The SEM and TEM micrographs revealed that the synthesized silver nanoparticles were spherical in shape with a size range from 38 nm - 85 nm. The silver nanoparticles synthesized by the isolate were also used to explore its antibacterial potential against pathogens like Salmonella Typhi, Salmonella Paratyphi, Vibrio cholerae and Staphylococcus aureus.
Abstract 1,3‐Dithian (I) kann nach Metallierung im Eintopfverfahren mit Dimethylformamid und 3‐Bromcyclohexen (II) zum Cyclohexenyl‐formyl‐dithian (III) umgesetzt werden.
Poultry farm soil samples collected from different localities of Ernakulum and Thrissur districts of K erala were screened for the keratinolytic fungi. During the co urse of study 8 different fungi were isolated and i Aspergillus, Chrysosporium, Microsporum, Trychophyt on and Penicillium were the fungi isolated and were grown in wheat bran substrate. Feather keratin powder was added to the substrate to enhance the enzyme produ ction. They were found utilizing keratin substrate releasi ng keratinase enzyme into the medium. These enzymes were assayed for their activity. Some cultural condition s were tested to attain maximum Keratinase producti on. Maximum enzyme production was reached on the 4 th day of incubation of the culture at 37 o C and pH 8.5
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