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Recent researches speak about the utilization of biological systems especially enterobacteria to synthesize nanoparticles is a novel approach. The present study demonstrates an eco-friendly and low cost protocol for synthesis of silver nano particles using the cell free filtrate of Lactobacillus bulgaricus when supplied with aqueous silver ions. Characterization of silver nanoparticles was done by UV-Visible absorption spectroscopy shows maximum absorption at 420 nm, Transmission electron microscope (TEM) revealed the formation of spherical nanoparticles with size ranging between 40-50nm, X-Ray diffraction (XRD) pattern shows spectrum, which reveals the FCC structure of silver nanoparticles. Energy dispersive spectroscope (EDS) analysis was done using SEM instrument equipped with thermo EDS attachment shows the optical absorption peak at 3kev. Microbial nanoparticles showed very strong inhibitory action against Staphylococcus aureus, Staphylococcus albus, & Pseudomonas aeruginosa.

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Mixed ligand complexes of nickel(II) with 2,4-dihydroxyacetophenone oxime (DAPO) and 2,4-dihydroxybenzophenone oxime (DBPO) as primary ligands, and pyridine (Py) and imidazole (Im) as secondary ligands were synthesized and characterized by molar conductivity, magnetic moments measurements, as well as by electronic, IR, and 1 H-NMR spectroscopy. Electrochemical studies were performed by cyclic voltammetry. The active signals are assignable to the Ni III/II and Ni II/I redox couples. The binding interactions between the metal complexes and calf thymus DNA were investigated by absorption and thermal denaturation. The cleavage activity of the complexes was determined using double-stranded pBR322 circular plasmid DNA by gel electrophoresis. All complexes showed increased nuclease activity in the presence of the oxidant H 2 O 2 . The nuclease activities of mixed ligand complexes were compared with those of the parent copper(II) complexes.