Showing 5 results for Mohabbati
Mahdi Mohabbati,
Volume 2, Issue 8 (winter 2009)
Abstract
Eyn-ol Ghozat Hamedani is one of the prominent scholars and theosophists in the field of literary theory with lots of in-depth studies in this area. In his four excellent works, he has introduced fresh and unique ideas regarding the criticism and interpretation of the literary texts, among which one can point out: the relationship between expression and meaning; words’ connective and separative forms with respect to the meaning and content; the relation between poem and prose, and the mentality and the viewpoint of the reader; the impromptu writing especially in three stags including childhood, the state of wisdom, and the state of being in love. This study intends to analyze Eyn-ol Ghozat Hamedani’s works based on the frameworks proposed by him.
Volume 10, Issue 0 (بهار 86- 2008)
Abstract
Objective: Current of antibiotic treatment for H.pylori infection is often associated with frequent adverse effect and resistant to antibiotic. Alternative treatment method to control H.pylori infection is needed. The aim of this study was to test in vitro anti Helicobacter activity of Lactobacilli acidophilus isolated from yogurt.
Material and Methods: Forty H.pylori strains isolated from 145 human gastric biopsies. After the primary culture of biopsies in the brucella blood agar and identification of H.pylori by biochemical tests, susceptibility tests to antibiotics (metronidazole, clarithromycin, amoxicillin and tetracycline) were performed with MDDM (Modified Disk Diffusion Method) and E test. The isolates were cultured in brucella broth and the effect of Lactobacillus acidophilus isolated from yogurt (cultured in MRS broth) on growth of H.pylori was tested by a mixed culture technique (co-culture).
Results: Twenty five (62.5%) of the 40 H.pylori isolates were resistant to antibiotics. Resistance rates to metronidazole, clarithromycin, amoxicillin and tetracycline were 62.5%, 22.5%, 2.5% and 0% respectively.
Twenty two (56%) of the 40 H.pylori isolates were inhibited by L. acidophilus in mixed culture. This inhibition occurred only when the two organisms were incubated together for more than 24 h. Lactobacillus acidophilus was able to inhibit the growth of both antibiotic sensitive and resistant H.pylori strains. Fifteen (68.2%) of the inhibited isolates were susceptible to antibiotics and seven (31.8%) were resistant to antibiotics.
Conclusion: We observed a significant suppression in the growth of H.pylori in the presence of L. acidophilus. This occurred only when the two organisms were incubated together for more than 24h. Based on our findings, L. acidophilus was found to be a potentially effective probiotics against H.pylori and could enhance antibiotic therapy for H.pylori eradication in humans.
Volume 12, Issue 1 (1-2009)
Abstract
Objective: Vancomycin-resistant enterococci (VRE) have emerged worldwide and have become an increasing problem in clinical settings. Acquired glycopeptide resistance in Enterococcus species is due to the acquisition of van A, van B, van D, van C and van E genes, resulting in the production of peptidoglycan precursors with reduced affinity for glycopeptide antibiotics. The origin of these van genes is still unknown, but recent studies have indicated that van B resistance in enterococci might arise from gene transfer from the human bowel flora.
In this study, we investigated the presence of Enterococcus-associated van A, van B, van C, van D, van E genes in the feces of hospitalized patients.
Materials and Methods: To determine the prevalence of vancomycin-resistant enterococci (VRE) fecal colonization of hospitalized patients, 422 Enterococcus spp. isolated from stool of patients in Amiralam hospital. Disk diffusion method was used to detect resistance to vancomycin. The MICs of vancomycin were determined by the agar dilution method. The presence of van A, B, C, D and E genes were assassed by PCR analysis.
Results: PCR was positive for van A for 6 out of 10 (60%) and van B for 4 out of 10 (40%) of VRE strains. Among the van positive enterococci, two (20%) specimens contained both van A and van B gene, whereas no van C, D and E positive enterococcal isolates were identified from these specimens. The MIC of VRE isolates were between 512- 1024 μg/ml.
Conclusion: Our results showed that most glycopeptide resistant Enterococcus isolated from stool of hospitalized patients carried van A and van B. It is also possible that frequency of infections caused by glycopeptide-resistant enterococci will increase in our geographical area.
Volume 14, Issue 4 (3-2012)
Abstract
Objective: Antigen 85 complex of Mycobacterium tuberculosis includes three immunogenic proteins which are important TB vaccine candidates. The use of these protein as a component of subunit vaccines, as a part of DNA vaccines or recombinant BCG boosters, enhances their recombinant production. Recombinant production of these mycobacterial proteins located in the cell wall somehow differs from the other proteins, as they are partially apolar. Therefore, this study aims to produce recombinant Ag85C as a vaccine candidate.
Methods: Ag85C gene was cloned in pJET1.2 and subsequently in pET32a(+). Both recombinant plasmids were sequenced. Expression of the recombinant protein was induced with 1mM IPTG. Recombinant Ag85C was purified through dissolving the inclusions in 8M urea buffer, absorbed to Ni-NTA resins, washed by buffers with decreasing urea concentrations, and finally eluted in aqueous solution. Western blot analysis was performed using anti-6His tag antibody, rabbit anti-M. tuberculosis polyclonal antibody, and the serum from hospitalized TB patients.
Results: Ag85C successfully cloned in both plasmid vectors. The recombinant Ag85C expressed in the E. coli host and was purified with significant yield.
Conclusion: Western blot results along with that of sequencing ensure accurate production of recombinant Ag85C, retaining its partial epitopes
Volume 26, Issue 2 (Spring 2023)
Abstract
Introduction
This study investigates the susceptibility and resistance of H. pylori isolates recovered from gastroduodenal patients naive to clarithromycin.
Methods
To that end, H. pylori strains were isolated from antral biopsies of pretreatment patients, and antral biopsy specimens were subsequently cultured. Presumptive H. pylori colonies were also confirmed on enriched Brucella agar by biochemical tests, including catalase, oxidase, rapid urease, and the standard polymerase chain reaction (PCR) method. The antimicrobial susceptibility testing was performed by standard disk diffusion methods according to the Clinical and Laboratory Standards Institute (CLSI) guidelines. Then, the Epsilometer test (E-test) was used to determine the minimal inhibition concentration (MIC).
Results
Of 180 samples, 80 (44%) were positive for urease and were included for further analysis. 65 were also positive in culture base method. The sensitivity test indicated a 23% resistance rate to clarithromycin among the six clarithromycin-resistant strains: four have a common form of the A2143G mutation, and two have A2142G mutation.
Conclusion
The PCR indicated that the level of resistance to clarithromycin was very similar to the resistance level in Iran.