Bioleaching is the extraction of metals from their ores through the use of microorganisms. Inthis process, the use of native bacteria leads to achieve more yields of metals. So, in the presentstudy, native sulfur-oxidizing bacterium in potentiality of uranium extraction was isolated fromGhachin mine in Iran and identified by partial gene sequencing. For this purpose, the watersamples were colle...

Serratia marcescens NJ01, a Gram-negative bacterium, can infect tomato leaves and cause chlorosis wilting. The present study evaluated the quorum sensing (QS) biofilm inhibitory effects of ...

conclusions this study showed that some properties of antimicrobial substances produced by the ga strain differed from other peptide antibiotics produced by the genus bacillus such as bacitracin, which increases the likelihood of its novelty. results the isolated bacterium was identified as a new strain of bacillus atrophaeus. the antimicrobial substance exhibited heat stability between 25ºc an...

the purpose of this research was to design a semi-industrial culture medium to obtain the maximum biomass production from bacterium bacillus subtilis utb96. in the first step, in order to reduce the cost of culture medium components, commercial products and industrial by products including, sugar beet molasses, sugar cane molasses, potato waste water and milk serum as carbon sources and corn st...

antibacterial activity of fe3o4 nanoparticles was investigated in three microorganisms including p. aeruginosa, e. coli and staphylococcus aureus. fe3o4 nanoparticles were synthesized by chemical precipitation method (20 nm). the fe3o4 nanoparticles antibacterial effect against pseudomonas aeruginosa, escherichia coli and staphylococcus aureus were studied by the culture method. first of all, e...

backgrounds and aims: mastitis is a mammalian disease which is considered important due to its potential economic damages. trueperella pyogenesis is one of the important opportunistic pathogens of the mammary glands of cattle. this bacterium can produce acute mastitis infection in dairy cattle. in fact, this bacterium has several virulence genes which contribute to its pathogenicity. therefore,...

Introduction We must, albeit reluctantly, dismiss the naive but comforting myth of the bacterial cell as a simple loner: a self-contained bag of uncompartmentalized enzymes, so exquisitely uncomplicated as to be understood outright and considered passé in this new millennium—a biological beaker for examining the more complicated eukaryotic versions of life. The recent EURESCO Conference on Bact...

Extensive research on the formation of methionine has implicated vitamin B12 as a cofactor in the final reaction of the biosynthetic sequence. Since plants and fungi do not produce or require B12, an alternate reaction must also exist. It is thus not surprising that Escherichia coli has been found to possess two mechanisms for the methylation of homocysteine to methionine (9). These reactions a...

This article examines optimal control model for the spread of diphtheria disease. Diphtheria is an infectious disease caused by bacterium Corynebacterium diphtheriae. divided into six compartments, namely population susceptibles (

The cell envelope of a marine pseudomonad as seen in thin section by electron microscopy has the double-membrane structure typical of other gram-negative bacteria. Cells washed with a solution containing Na+, K+, and Mg++ at their concentrations in the growth medium, when suspended briefly in 0.5 M sucrose, lost 13% of their hexosamine in a form nonsedimentable by centrifugation at 73,000 x g. ...