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Showing 3 results for Zarrini
Gholamreza Zarrini , Eiraj Rasooli, Mohsen Abazari, Younes Ghasemi,
Volume 11, Issue 4 (winter 2011)
Background & Objectives: Expansion of microbial drug resistance, have indicated to introduce new source of drugs with antimicrobial properties such as antimicrobial secondary metabolites which produced of Cyanobacteria spp. Antimicrobial activity of Cyanobacteria spp. of Urmia Lake catchment area was not already reported, therefore in this research, antibacterial and antifungal properties of cyanobacteria varieties isolated from this ecosystem and identification of the potent strains were investigated.
Method: Different environmental samples screened for isolation of cyanobacterial strains. Cyanobacterial extracts were prepared by using different solvents. The effect of these extracts was evaluated by disc diffusion method and by measuring minimum inhibitory concentrations (MIC) against some gram positive and gram negative bacteria and fungi. Cyanobacteria spp. with the high antimicrobial activity was identified according to Microscopic and macroscopic characters and 16SrRNA sequences.
Results: In this research, 54 cyanobacterial strains were isolated that six strains with significant antimicrobial activity identified as Gloeocapsa sp., Anabaena sp., Nodularia sp., Synechococcus sp., Leptolyngbya sp. and Chroococcus disperses. the highest antimicrobial activity achieved by the chloroform extract on gram positive bacteria and fungi. Minimum inhibitory concentration (MIC) levels for the cyanobacterial strains were ranged 20 to 80 µg/ml and Leptolyngbya sp. showed the highest effects on Candida krusei with MIC level 20 µg/ml.
Conclusion: According to the results, cyanobacteria can be a source of production new antimicrobial compounds.the results showed that the filamentous cyanobacteria Anabaena sp., Nodularia sp., and Leptolyngbya sp. produce active compounds against gram positive bacteria and yeasts.
Delsuz Rezaee , Gholamreza Zarrini , Mohammad Ahangarzadeh Rezaee,
Volume 14, Issue 1 (spring 2014)
Background & Objectives : Acinetobacter baumannii is an opportunistic Gram-negative pathogen with increasing relevance in a variety of hospital-acquired infections especially among intensive care unit patients. A. baumannii is mostly a cause of septicemia, pneumonia and urinary tract infection following hospitalization of patients. In this study antibiotic susceptibility pattern of A.baumannii isolates and molecular typing among isolates resistant by REP-PCR were determined.
Methods : During study, the A. baumannii, were isolated from hospitals in Tehran. The isolates were identified using standard biochemical tests and antibiotic susceptibility was determined by the disk diffusion method. Extraction of DNA and molecular typing of isolates performed using CTAB method and REP-PCR, respectively.
Results : In this study 75 A. baumannii isolates separated from patients with an average age of 51 ± 18.45 years . The highest resistance rate was against azteronam (97%), ceftazidim (93%), cefepime (93%), piperacillin-tazobactam (93%), ciprofloxacin (93%) and ticarcillin (93%) while the lowest resistance rate was against tigecycline (n= 51, 68%), followed by tobramycin (n=24, 32%), ampicillin-sulbactam (n=21, 28%), amikacin (n=16, 21%), and carbapenems (n=11, 15%). The REP-PCR in resistant of A. baumannii isolates showed that the genotypes of A, B and C are the predominant genotypes in the resistant antibiotics.
Conclusion: This study showed a high percentage of resistance to antimicrobial agents among genotypes A, B, and C of the A. baumannii isolates therefore strategies to control the spread of A. baumannii isolates must be designed and evaluated.
Mitra Rabiei, Gholamreza Zarrini, Majid Mahdavi,
Volume 18, Issue 2 (summer 2018)
Background & objectives: Colorectal cancer is one of the most common cancers in the world. Much attention has been given to nutritional supplements that can alter intestinal flora as factors preventing colon cancer. Research has shown that lactic acid bacteria in foods are potentially capable of inducing apoptosis. In this regard, the most focus has been on Lactobacillus genus. This study, investigated the cytotoxic effect of metabolites of isolated strain from Azerbaijan traditional cheeses on HCT116 colorectal cancer cells.
Methods: In this cross-sectional study, after collecting samples of traditional "Lighvan" and "jug" cheeses in the region of Azerbaijan, MRS medium was used for isolation of lactobacilli. The isolates were identified by biochemical and molecular approaches after primary confirmation. The metabolites were produced in MRS broth, and their supernatants were separated. The inhibitory effect of the supernatants of the isolates on HCT116 cancer cells was studied and their effects were evaluated by microscopy and MTT assay.
Results: In this study, three isolates of "Lighvan" and sixteen isolates of "jug" cheeses were obtained. The results of anticancer activity showed that the supernatants of the isolates CT2 and JT1 had a significant anticancer effect on HCT116 cancer cells (p˂0.05). Identification of the isolates CT2 and JT1 showed 99% and 96% similarity with Lactobacillus brevis, respectively.
Conclusion: Lactobacilli in Azerbaijan traditional dairy products have a significant value in terms of anticancer properties.