Paper Title
Biosynthesis of Gold Nanoparticle and its Application against Fungal Phytopathogen

Abstract
The biosynthesis of metal nano-particles by various microorganism is an emerging area of research in nanotechnology. The development of eco-friendly technologies in metal nanoparticles synthesis is of considerable importance and also their various uses as antimicrobial, anti-cancerous and drug delivery has been reported in past few years. A variety of metal nanoparticles with well-defined chemical composition, size, and morphology have been synthesized by using different microorganisms, like fungi, cyanobacteria and algae. In the present work, synthesis of Gold nano-particles by bacterial strains isolated from soil samples have been reported. Soil isolates were used for extracellular biosynthesis of gold nanoparticles (AuNP). Thereafter, the nanoparticles have been characterized through UV–Visible spectrophotometry and DLS (Dynamic Light Scattering). The Gold nanoparticles have shown antimicrobial activity against Fusarium oxysporum. The minimum inhibitory concentrations of AuNP against the fungal pathogen were estimated through Octerlony’s method. Keywords - Biosynthesis, Gold Nanoparticle (AuNP), Spectrophotometry, Dynamic light Scattering