List of Articles اشریشیا کلی

• Open Access Article
  • Abstract Page
  • Full-Text
  
  1 - Cloning of Streptococcal pyogenes Exotoxin, A gene in E. coli
  Elham Siasi Mitra Salehi Simin Mirjalili
  Aim and Background: Exotoxin A is one of the toxins which produce by group a streptococcuses. This Toxin is a protein soluble substance which causes scarlet fever and different kinds of infections as a super antigen. This toxin has antigenic property and special anti-to More

  Aim and Background: Exotoxin A is one of the toxins which produce by group a streptococcuses. This Toxin is a protein soluble substance which causes scarlet fever and different kinds of infections as a super antigen. This toxin has antigenic property and special anti-toxins can neutralize it. In this research, was studied production of Streptococcus pyogenes exotoxin A recombinant protein in E. coli by cloning. Materials and methods: At the first, genome of the bacteria was extracted and used PCR. Then agarose gel electrophoresis was performed for detection of size and quality of the resulting amplicons. According to TA Cloning kit protocol, the target gene was inserted in to the PTG19 Cloning vector and the recombinant plasmid was inserted in to the E. coli XL1Blue bacteria. Eventually checking the sequencing data obtained from cloned gene in the vectore compared with the refrenece sequenece obtained from the NCBI database, confirm the success of the gene cloning by its correct sequence. Results: The results showed that PCR product is a fragment with a length of about 708 bais pairs. This is for the first time that the exotoxin A gene was cloned by the TA Cloning in the PTG19 Cloning vector and the E. coli XL1Blue host cell. The results of sequencing were confirmed presence of exotoxine A gene, speA. Conclusion: The speA gene was amplified and correct cloning was confirmed by TA Cloning with PTG19 vector and E. coli XL1Blue host cell. Manuscript profile
• Open Access Article
  • Abstract Page
  • Full-Text
  
  2 - The synergy effect of nanoparticles of magnesium oxide and antibiotics on Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa
  Elham Siasi Mehrabian Sedigheh َAli Rafiei
  Aim and Background: Prevalence of multidrug resistant bacteria,to be necessary simultaneous use of metal nanoparticles and antibiotics for synergistic antimicrobial effects. In this study was studied the synergy antimicrobial effect of magnesium oxide nanoparticles spec More

  Aim and Background: Prevalence of multidrug resistant bacteria,to be necessary simultaneous use of metal nanoparticles and antibiotics for synergistic antimicrobial effects. In this study was studied the synergy antimicrobial effect of magnesium oxide nanoparticles specific concentrations with antibiotics on the standard strains of Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa. Materials and Methods: After preparation of nano particles and bacteria was used antibiogram by disk diffusion. The antimicrobial properties of nanoparticles were studied by using MIC (Minimum Inhibition concentration) and MBC (Minimum Bactericidal concentration), blank discs and liquid medium. Synergistic effects for bacteria were detected by combining of specific concentration of nanoparticles with antibiotic disks and solution of antibiotics (well-method). Results: The results of the MIC and MBC and liquid medium were confirmed antimicrobial properties of these nanoparticles. E. coli other than the bacteria was more sensitive to lower concentrations of the nanoparticles. Synergistic effect was showed between different concentrations of nanoparticles with methicillin disk in E. coli but, synergistic effect can be observed for three bacteria in the well-method. Conclusion: The results showed synergy effect was observed in all of the bacteria at low concentrations with antibiotics, so this property can be used to reduce the dosage and number of consuming antibiotics. Manuscript profile