In this study, the biosynthesis of gold nanoparticles by Penicillium chrysogenum, isolated from Ahar copper mine, was investigated. The gold nanoparticles were synthesized by reducing the aqueous gold ions using the culture supernatant of the filamentous fungi. The UV–vis spectrum displayed a characteristic peak at 532 nm that is very specific for gold nanoparticles. The XRD spectrum confirmed ...

in this study, the biosynthesis of gold nanoparticles by penicillium chrysogenum, isolated from ahar copper mine, was investigated. the gold nanoparticles were synthesized by reducing the aqueous gold ions using the culture supernatant of the filamentous fungi. the uv–vis spectrum displayed a characteristic peak at 532 nm that is very specific for gold nanoparticles. the xrd spectrum confirmed ...

this study investigates the optimization of gold dissolution from aghdarre ore. therefore, a laboratory investigation was initiated, to improve the leaching conditions with the objective of maximizing mill capacity with no reduction on gold recovery. it was observed that the time reduction from 25 to 15 hours did not change the gold recovery. in the other words, it indicated that a capacity of ...

Gold price forecast is of great importance. Many models were presented by researchers to forecast gold price. It seems that although different models could forecast gold price under different conditions, the new factors affecting gold price forecast have a significant importance and effect on the increase of forecast accuracy. In this paper, different factors were studied in comparison to the p...

influenza is one of the most important viral diseases that is common among the birds and the mammalsand is caused by specific viruses that belong to the orthomyxoviridae family. migratory aquatic birds arethe reservoir of the disease and there is a likelihood of the disease in any region. there are differentmethods for detecting the avian influenza, but by the point of detection rates, the elis...

To improve the utilization efficiency of Au catalyst, triangular Au nanoplates on functional reduced graphene oxide were prepared by a facile method. The products with ultra-low trace amounts of Au afforded high catalytic efficiency for the reduction of 4-nitro phenol. The morphology of the products was controlled by tuning the addition of HAuCl4.

We report the controllable coiling of colloidal gold nanowires induced by the contraction of their polymer shells. The mechanical energy stored in this process can be released upon removal or swelling of the polymer shells.

Several methods have been developed for gold exploration in the past, among which biological base method is known to be the most efficient with least expenses. This method can also be used for latent gold prospects exploration. In the present study, the possibility of applying Bacillus cereus frequency in soil as a biological marker was investigated for the exploration of latent gold prospectin...

The aim of this study is experimental assay of sensitivity and stability of a bimetallic silver/gold SPR sensor chip. This chip utilizes the sensitivity of the silver and the stability of the gold. Moreover, the Silver layer (instead of usual Cr or Ti layer) was used as an adhesive intermediate layer between the Gold layer and the glass substrate. The optimization of the Gold/Silver thickness u...