background bottled mineral water is generally considered more pure than tap water in developing countries. immunocompromised patients and those with co morbid conditions are often offered bottled mineral water since they are believed to be safer. the present study was designed to determine the risk of common bacterial contamination of commercially available bottled mineral water in iran. materi...

background: photoreactivation of microorganisms following uv disinfection is a disadvantage of using uv technology for wastewater treatment, since in some cases it may even reach several logarithms. the aim of this study was to evaluate the possibility of the photoreactivation of indicator bacteria (coliform and streptococci) in the irradiated effluent. methods: this study was performed using t...

The thermoalkalophilic lipase from Bacillus thermocatenulatus BTL2 exhibits a low phospholipase activity (lecithin/tributyrin ratio 0.03). A single round of random mutagenesis of the BTL2 gene followed by screening of 6000 transformants on egg-yolk plates identified three variants with 10-12-fold increased phospholipase activities, corresponding to lecithin/tributyrin ratios of 0.16-0.36. All v...

behaviors of simultaneous removal of no and so2 using the coculture of anaerobic denitrifying bacteria and sulfate reducing bacteria were investigated in a bench-scale biotrickling-filter. approximate 20 days were required to use the landfill leachate as the microbial seed to develop the biofilm on the surface of packing material. when the combined no/so2 removal biotrickling-filter was operate...

during 2003-2004, a number of rhizospheric soil samples were collected of either healthy or symptomatic field grown melon plants infected with fusarium oxysporum f. sp. melonis race1/2 (fom). twenty one bacterial strains capable of inhibiting fom including burkholderia sp., bacillus sp., streptomyces sp. and pseudomonas fluorescens were isolated. the strains colonized roots of “long melon” cult...

corneal ulcer is a major cause of blindness throughout the world. when the cornea is injured by foreign particles, there are chances of infection by the organism and development of ulcer. bacterial infection in the cornea is invariably an alteration of the defense mechanism of the outer eye. it is essential to determine the local etiology within a given region when planning a corneal ulcer mana...

endophytes are important resources of bioactive compounds and due to their potential in theproduction of secondary metabolites, they are regarded as a potential reservoir ofbiotechnological applications. in this study, the bioactivity of bacteria and yeasts endophytesresiding in thymus sp. was evaluated. during april to october 2011, symptomless and healthytissues of thymus sp. were collected. ...

this study deals with bioleaching of the low grade uranium ore of saghand mine in iran using a mixed culture of mesophilic bacteria (acidithiobacillus ferrooxidans, acidithiobacillus thiooxidans and leptospirillum ferrooxidans). experiments were carried out in shaking flask examining the effect of temperature, initial ferrous ion concentration, pulp density and particle size. variations of ph, ...