Microbiology
Masoud keykhah; Morteza Karami; Hosseinali Rahdar; Elahe Taki
Volume 26, Issue 5 , November and December 2019, , Pages 627-640
Abstract
The genus Mycobacterium is a group of acid fast bacteria with DNA G+C content of 61-71% and the cell wall containing mycolic acid. According to growth physiology, mycobacteria grouped into two divisions: rapidly-growing and slow-growing mycobacteria. Three groups of mycobacteria exist based on pigment ...
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The genus Mycobacterium is a group of acid fast bacteria with DNA G+C content of 61-71% and the cell wall containing mycolic acid. According to growth physiology, mycobacteria grouped into two divisions: rapidly-growing and slow-growing mycobacteria. Three groups of mycobacteria exist based on pigment production: nonpigmented (nonphotochromogens), photo-chromogens and scotochromogen. Both human obligate pathogens (M. tuberculosis and M.leprae) and opportunistic species exist in mycobacteria genus. There is different kind of mycobacterial infections such asrespiratory infections, lymphatic node and skeletal involvement, dermal and disseminated infection. Spread of HIV virus and immunodeficiency in recent years makes the mycobacterial infections one of the most dangerous infections. Acid fast staining, biochemical tests and cell wall mycolic acid and fatty acid analysis are used for detection of mycobacteria. Different molecular tests including different PCR basedmethods; hybridization and sequencing tests are used for diagnosis and also verifying phenotypic and biochemical tests. Clarithromycin, rifabutin, ciprofloxacin, rifampin and ethambutol currently were used for treatment of slow growing mycobacterial infections. Whereas macrolides, cephalosporins and fluoroquinolones are used for rapidly growing treatment. For rapidly growing mycobacteria, disk diffusion method, disk elution method and broth micro dilution method are more appropriate. Radiometric methods and broth micro dilution method are choice methods for slow growing mycobacteria drug susceptibility test. Moreover molecular methods like PCR single-strand conformational polymorphism (PCR-SSCP), Sequencing, PCR-RFLP and Multiplex-PCR are developed for drug susceptibility determination in mycobacteria. According to non-tuberculosis mycobacteria clinical significance, clinical laboratories and health care team most take attention to diagnosis of these bacterial infections.
Microbiology
Behnam Hashemi; saeid taghiloo; Esmaeil allahmoradi; Morteza Karami; Hossein ali Rahdar
Volume 25, Issue 3 , July and August 2018, , Pages 303-308
Abstract
AbstractIntroduction: Portulaca oleracea is one of the most utilized herbs in the world. According to some antibacterial effect of plants extracts, it seems that this extracts can be used in the bacterial infection treatments. In order to assessment of antibacterial effect of the Portulaca oleracea extract, ...
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AbstractIntroduction: Portulaca oleracea is one of the most utilized herbs in the world. According to some antibacterial effect of plants extracts, it seems that this extracts can be used in the bacterial infection treatments. In order to assessment of antibacterial effect of the Portulaca oleracea extract, we determined minimum inhibitory and minimum bactericidal concentration of the Portulaca oleracea extract on the pathogenic bacterial species that antibiotic resistant pattern was determined in this species.Methods: Hydro-Alcoholic extract of the Portulaca oleracea was harvested. Bacterial species including S. aureus, P. aeruginosa, L. monocytogenes, A. baumannii, E. coli and K. pneumonia was collected from the Iran pasteur institute. Antibiogram was determined by disk diffusion method and then MIC and MBC of Hydro-Alcoholic extract of the Portulaca oleracea was determined.Results: Highest MIC concentration was observed in P. aeruginosa, L. monocytogenes, E. coli and K. pneumonia. While highest MBC concentration related to L. monocytogenes.Conclusion: Herbal antibacterial extracts can be useful in human infection control. In order to this goal, in this study antibacterial effect of Portulaca oleracea extract determined against six important pathogens. According to Our results hydro-alcoholic extract of Portulaca oleracea show antibacterial effect on human pathogens including E. coli, K. pneumonia, S. aureus, A. baumannii, P. aeruginosa and L. monocytogenes.