conclusions: with respect to the obtained results and regarding to the daily increase of the resistant microbial strains to the commercial antibiotics, it can be concluded that these extracts can be proper candidates of antibacterial substance against pathogenic bacterial species especially s. aureus, e. coli, k. pneumoniae and s. epidermidis. results: the extract of c. fistula was effective ag...

purpose: in this study the inhibitory effect of eucalyptus extracts as a natural and herbal antibacterial substance was evaluated against pseudomonas aeruginosa strains (8821m and atcc27853). material and methods: the mic (minimal inhibitory concentration) of alcoholic and aquatic extracts of eucalyptus was determined using the tube and agar dilution methods. the growth rate of pseudomonas aer...

Investigation of the alcoholic extract of chamomile against growth and production of catalase, Dnase and haemolysin of Staphylococcus aureus (ATCC29213) were the aims of this study In this study, German chamomile was prepared from Tehran agricultural researches center. Extraction was performed by ethanol 85 (Maceration method) then solvent is removed by vacuum distillation system (concentrated ...

Brown alga, Turbinaria conoides was successively extracted with n-hexane, cyclohexane, methanol and ethanol:water (1:1). The extracts were evaluated for antibacterial and antifungal activities by disc diffusion method. Minimal inhibitory concentration was determined for active extracts by broth dilution method. The antiviral activity and cytotoxicity of the extracts were tested in human embryon...

Microcin J25 (MccJ25) is a small ribosomally synthesized antimicrobial peptide that is produced by Enterobacteriacea family especially E.coli. The present study focuses on preparation and evaluation of in vitro antimicrobial and biological properties of a new peptide derived from MccJ25. We prepared a MccJ25-derived peptide containing 14 amino acids and a single intra-molecular disulfide bond a...

Antibiotic susceptibility of biofilms is a growing public concern due to overuse use of antibiotics. Thus, determining an effective minimal concentration of antibiotics to eradicate biofilms is crucial. Here we present a novel one-pot assay for the analysis of antibiotic susceptibility of biofilms using a microfluidics system where continuous concentration gradients of antibiotics are generated...

A total of 30 clinical isolates of group B streptococci were studied for penicillin tolerance in vitro. Minimal inhibitory and bactericidal concentrations of penicillin were determined simultaneously in three test media which have been used for group B streptococci, tryptose phosphate, Mueller-Hinton, and Todd-Hewitt broths, using a logarithmic-phase inoculum of 10(5) colony-forming units per m...

background: the aim of this study was to determine the occurrence of virulence determinants and vancomycin- resistant genes among enterococcus faecalis and e. faecium obtained from various clinical sources. methods: the study was performed on the 280 enterococcal isolated from clinical specimens in hamadan hospitals, western iran in 2012-14. antibiotic susceptibility testing was performed using...