الفهرس 
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Abstract
There is growing awareness that the continued widespread use of chemical and physical approaches in the synthesis of gold nanoparticles may pose a serious health problem. These methods are known to generate large amounts of hazardous by-products. Therefore, it is relevant to consider alternative natural source for the synthesis process. Biological methods are safe, ecofriendly and fabricate nanomaterials of unique characteristics. Synthesis of nanomaterials with controlled size and shape defines the utility of these materials in technology. Application of these materials in technology depends strongly on their adaptability to the specific system. In fact, controlling these aspects, metal nanostructures could be utilized effectively in the fields of optics, optoelectronics, environment, medicine, and biotechnology. For applications in bio-nanotechnology, a modern and attractive research area that seeks the intersection between biology and nanotechnology, nanomaterials need to be biocompatible. Considering environmental aspects and adaptability in biotechnology, the methods of biological nanomaterial synthesis have also been evolved.
Therefore, the goal of the present work concentrated on the biosynthesis of gold nanoparticles via green procedure using a marine bacterium Bacillus sp. SDNS. Optimizing the size of the formed nanoparticles using the standard experimental designs as well as studying the applicability of these nanoparticles in some environmental applications were considered. The results obtained are summarized as indicated below.