Recently, the effects of antimicrobial activity of silver nanoparticles was considered by researcher because of Bacterial resistance to antimicrobial agents in chemical.The aim of this study was to evaluate the antimicrobial activity of the gold nanoparticles on Escherichia coli. Gold nanoparticles are chemically synthesized. Standard strain of E. coli was cultured in a nutrient broth. Minimum ...

selenium is an essential element for humans, therefore, adding it to plants is convenient for biofortification. thus, the aim of this work was to analyze experimentally the ability of sodium selenite to increase the concentration of se and modify the antioxidant activity in tomato plants. we used plants of the toro hybrid variety and applied three treatments: 0, 2 and 5 mg l-1 of selenium as so...

Aim and objectives: Lead is one of the most important environmental pollutants that plays a significant role in increasing the stability of some other pollutants through changing the microbial profile of soil.  Bacillus subtilis WPI is one of the most abundant bacteria existing in the wastewater. Due to the presence of laccase enzyme in this bacterium, it can facilitate the decomposition proces...

in order to evaluate the allelopatic potential of wheat aquatic extracts against winter wild oat (avena ludoviciana) at germiantion and vegetative growth stage two expriments were coducted in islamic azad university, shoushtar branch at 2012. germination expriment was laid out according to completely randomized design with four replications and treatments were various concentration of wheat ext...

lipoxygenase(lox) catalyzes irreversible transfer of oxygen molecule to arachidonic and linoleic acid to produce 13 hydroproxy octadecadienoic acid. recent studies showed the involvement of lipoxygenase products, leukotrienes, in inflammations and lipoxygenase pathways acts as mediators of early inflammatory events in atherosclerosis. the aim of the present study was purification and characteri...

a completely randomized design (crd) with three replications was conducted at greenhouse of urmia university in 2013 to study the effect of different methyl jasmonate concentrations (0, 0.1 and 0.5 mm) on the activity of enzymes polyphenol oxidase, phenylalanine ammonia lyase, catalase, ascorbate peroxidase, guaiacol peroxidase and total protein content in basil. activity of the enzymes and tot...

the present work was designed to evaluate the in vitro lipid peroxidation inhibitory and antimicrobial activities of the methanol extract of phyllanthus niruri (mepn) (family:   euphorbiaceae) .   lipid peroxidation was measured by the optical density of the prepared solutions (10-320 µg/ml) and then the percent inhibition was calculated. ascorbate/feso 4 -induced peroxidation was inhibited by ...

in order to better understand how to prevent enzymatic greenning, it is important to understand  kinetic properties of polyphenol oxidase.  we investigated the effect of sds on the rate of catechol oxidation by small cherry tomato partial purified ppo. ppo activity increased with increasing sds concentration. the most effective concentration of sds was 0.8, 1 and 1.25 mm in according to ph and ...