Recently, commercial nanometer sized silver is extensively used for its antibacterial effect; however, nanoparticles may also have ecotoxicological effects after being discharged into aquatic ecosystems. Nanometer sized silver can flow into water ecosystems, where it can exert a variety of physiologically effects in aquatic animals, including fish. The current research aimed to examine the effe...

Objectives:Biofilms are communities of bacteria attached to surfaces through an external polymeric substances matrix. In the meantime, Acinetobacterbaumannii is the predominant species related to nosocomial infections. In the present study, the effect of silver nanoparticles alone and in combination with biocides and imipenem against planktonic and biofilms of A. baumannii was assessed.  Materi...

conclusion silver nanoparticles had appropriate effects in all three types of dilutions and allowing for a more protracted contact time has given significantly better results. patients and methods we have selected nine patients' metal file covers and following sterilizing, we have infected them with one of these bacteria; staphylococcus aureus, pseudomonas aeruginosa and bacillus cereus. t...

Green synthesis of nanoparticles using plants as sources exhibiting superiority over the physical and chemical methods that are expensive and can involve the use of toxic, hazardous chemicals, which may pose biological and environmental risks. In present study silver nanoparticles were synthesized in single step by biological method using extracts of Actinidia deliciosa paste as reducing and st...

BACKGROUND Elucidation of molecular mechanism of silver nanoparticles (SNPs) biosynthesis is important to control its size, shape and monodispersity. The evaluation of molecular mechanism of biosynthesis of SNPs is of prime importance for the commercialization and methodology development for controlling the shape and size (uniform distribution) of SNPs. The unicellular algae Chlamydomonas reinh...

Silver nanoparticles are increasingly used in various fields of biotechnology and applications in the medicine. Objectives of this study were optimization of production of silver nanoparticles using biotransformations by Fusarium oxysporum, and a further study on the location of nanoparticles synthesis in this microorganism. The reaction mixture contained the following ingredients (final concen...

The present study focused on the synthesis of silver nanoparticles using the aqueous extract of Ulva flexousa (green seaweed). Ten ml of the aqueous extract of alga was mixed with 90 ml of 1mM aqueous AgNO3 solution for reducing of Ag+ ions. The synthesized silver nanoparticles were characterized by UV-Vis spectra, XRD (X-ray diffraction), TEM (Transmission electron microscopy) and FT-IR (Fouri...

BACKGROUND Antibiotic resistance is a global issue that threatens public health. The excessive use of antibiotics contributes to this problem as the genes of antibiotic resistance can be transferred between the bacteria in humans, animals and aquatic organisms. Metallic nanoparticles could serve as future substitutes for some conventional antibiotics because of their antimicrobial activity. The...

The aim of present study is to determine the content of some phytochemicals in stem and leaf extracts of the medicinal plant of Glycyrrhiza glabra and design a green method for biosynthesis of silver nanoparticles by these extracts as stabilizers and bioreducers. The properties of the synthesized silver nanoparticles (AgNPs) were monitored by using Ultraviolet-Visible absorption spectroscopy (U...