Sulphur dioxide (SO2) is mostly used as an antioxidant additive in winemaking, but excessive levels may be harmful to both wine quality and consumers health. During fermentation, yeast Saccharomyces cerevisiae contributes significantly final SO2 levels, low-producing strains become especially interesting for the industry. Recent evidence implicating impairment of sulphate transport decrease pro...

in order to increase tylosin production by streptomyces fradiae, two mutagens, i. e. uv and ems (ethylmethanesulfonate) were used. death curves were plotted for these mutagens. optimum condition for obtaining mutants by uv radiation was determined by using a uv source lamp at a distance of 20 cm for 40-60 seconds. when ems was used at 4% (w/v) concentration, the best mutants were isolated after...

The prevalence of Helicobacter pylori strains resistant to macrolide is increasing worldwide. Macrolide molecules can be generally extruded by the AcrB-TolC system in bacteria. H. 26695 genome was assessed for putative translocases and outer membrane efflux AcrB (HP607) TolC (HP605) proteins. We investigated role (M-R) pylori. Both acrB- tolC-mutant M-R were constructed from insertional inactiv...

Biofilms are extracellular constituents composed of polysaccharides and other substances necessary for bacteria to defend themselves against foreign enemies. Amylase Streptococcus pyogenes is an enzyme that degrades produces nutrients invasion epithelial cells. S. salivarius oral commensal bacterium shows antibacterial activity pyogenes. We investigated the relationship between determine whethe...

Background:Pseudomonas aeruginosa is a gram negative non facultative bacterium and one of the members of normal flora in different sites of body in healthy humans.this bacterium can resist in fluids and hospital environments for a long time.Pseudomonas aeruginosa has two systems for glucose uptake:a low affinity oxidative pathway and a high affinity phosohorylative pathway.Although the role of ...

The soil-borne species Aneurinibacillus migulanus (A. migulanus) strains Nagano and NCTC 7096 were shown to be potent biocontrol agents active against several plant diseases in agricultural forest ecosystems. Both produce the cyclic peptide gramicidin S (GS) that was described as main weapon inhibiting some gram-negative gram-positive bacteria fungus-like organisms along with production of bios...

In a previous study, tomato race 3 (T3) strains of Xanthomonas perforans became predominant in fields containing both X. euvesicatoria and X. perforans races T1 and T3, respectively. This apparent ability to take over fields led to the discovery that there are three bacteriocin-like compounds associated with T3 strains. T3 strain 91-118 produces at least three different bacteriocin-like compoun...