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Bahador, Nima
- Characterization of a Bioactive Compounds Produced by Streptomyces phaeochromogenes NRRL B-2123
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Affiliations
1 Department of Microbiology, Fars Science Research Branch, Islamic Azad University, Fars, IR
2 Department of Microbiology, Kazeroun Branch, Islamic Azad University, Kazeroun, IR
3 Skin Diseases and Leishmaniasis Research Center, Department of Parasitology & Mycology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, IR
1 Department of Microbiology, Fars Science Research Branch, Islamic Azad University, Fars, IR
2 Department of Microbiology, Kazeroun Branch, Islamic Azad University, Kazeroun, IR
3 Skin Diseases and Leishmaniasis Research Center, Department of Parasitology & Mycology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, IR
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Nature Environment and Pollution Technology, Vol 13, No 1 (2014), Pagination: 85-90Abstract
Streptomyces is the largest genus of Actinobacteria and includes aerobic, Gram-positive filamentous bacteria with high G+C content. Although, few species of Streptomyces are pathogens, they could be characterized by production of the beneficial metabolites viz., antibiotics, antifungal, antiparasitic, and immunosuppressant compounds. The present study was conducted to isolate Streptomyces from soil and characterize their bioactive compounds. In total 85 soil samples were collected and assessed for production of the bioactive compounds by Agar Well Diffusion method against antagonistic microorganisms such as Escherichia coli, Pseudomonas aeruginosa, Bacillus cereus, Staphylococcus aureus, Aspergillus niger and Candida albicans. Of all the Streptomyces isolates, one strain exhibited potent activity against Staphylococcus aureus, Bacillus cereus and Aspergillus niger. The promising strain identified using 16SrRNA gene sequencing and recognized as Streptomyces phaeochromogenes strain NRRL. Then, the growth phase of production and Arbitrary Unit (AU) of the bioactive compounds were determined, and the cured bioactive compound was purified and subjected to 1H NMR, 13C NMR and FTIR analysis for determination of the structural formula. The results obtained illustrated that high level of the bioactive compounds produced at stationary phase with Arbitrary Unit 32 AU. On the other hand, the data obtained from 1H NMR, 13C NMR and FTIR analysis exhibited a straight chain with a possible structural formula C13H15NO3 for the bioactive compound.Keywords
Streptomyces, Phaeochromogenes, Bioactive Compounds, Antimicrobial Activity.- Diversity, Identification and Biotyping of Bacillus thuringiensis Strains from Soil Samples in Iran
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Affiliations
1 Department of Microbiology, College of Sciences, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, IR
2 Immunology Department, Professor Alborzi Clinical Microbiology Research Center, Shiraz University of Medical Sciences, Shiraz, IR
3 Organ Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, IR
1 Department of Microbiology, College of Sciences, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, IR
2 Immunology Department, Professor Alborzi Clinical Microbiology Research Center, Shiraz University of Medical Sciences, Shiraz, IR
3 Organ Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, IR
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Nature Environment and Pollution Technology, Vol 15, No 3 (2016), Pagination: 947-950Abstract
Bacillus thuringiensis is a bacterium known for producing insecticidal and cytocidal crystal protein during sporulation. One hundred soil samples were analysed which were introduced by seven methods, out of which sixty B. thuringiensis strains were collected to study the distribution and diversity of crystal proteins. The strains were characterized on the basis of microscopic examination of parasporal crystal morphology, biochemical tests, and analysis of parasporal inclusions protein profiles by SDS-PAGE. Majority of strains had bipyramidal crystals. B. thuringiensis subsp. thuringiensis was the most common biochemical type. Overall, according to our finding, it could be concluded that genetic diversity of B. thuringiensis strains is dependant on the geographical areas. It means that the production of crystal protein by different strains of B. thuringiensis probably dependant on the geographical area.Keywords
Bacillus thuringiensis, Biochemical Type, Crystal Protein.References
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- Antibiotic and Enzymatic Pattern of Pseudomonas aeruginosa Isolates Recovered from Environmental and Clinical Samples
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Affiliations
1 Department of Microbiology, College of Science, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, IR
2 Department of Microbiology, Kazeroun Branch, Islamic Azad University, Kazeroun, IR
3 Department of Mathematics, Kazeroun Branch, Islamic Azad University, Kazeroun, IR
1 Department of Microbiology, College of Science, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, IR
2 Department of Microbiology, Kazeroun Branch, Islamic Azad University, Kazeroun, IR
3 Department of Mathematics, Kazeroun Branch, Islamic Azad University, Kazeroun, IR
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Nature Environment and Pollution Technology, Vol 16, No 3 (2017), Pagination: 939-942Abstract
Pseudomonas aeruginosa is a Gram negative and motile bacterium with different virulence factors. Nowadays, the reports from worldwide illustrated antibiotic resistance of this opportunistic bacterium. Hence, the present study tried to isolate clinical and environmental samples and compare the antibiotic susceptibility as well as enzyme profiles of the isolates. For this purpose, 100 specimens from environmental sources and clinical sources have been collected. The samples were cultivated on cetrimide agar and blood agar, then the plates were incubated at 35°C for 24-48 hrs. The suspected colonies were purified and preliminarily characterized using Gram reaction, catalase, oxidase and motility test. Then they were identified using Api 20 NE kits. Afterward, antimicrobial susceptibility of the isolates was evaluated using Kirby-Bauer test, and enzyme profile were checked using API ZYM kit. The results obtained from this study indicated that out of 50 specimens, 10 isolates belonged to the environmental samples and 13 belonged to the clinical one. In addition, the highest isolation rate of clinical samples was belonging to the wound specimens. Furthermore, the results indicated that there is no difference between the enzyme profiles of the isolates, but regarding to the antibiotic susceptibility, the environmental samples were more sensitive than the clinical one.Keywords
Antibiotic Susceptibility, Clinical Sample, Environmental Sample, Enzyme Profile, Pseudomonas aeruginosa.- Microbial Diversity of Long-Duration Gas Injection Oil Reservoir Based on Next Generation Sequencing in South of Iran
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Authors
Affiliations
1 Department of Microbiology, Science and Research Branch, Islamic Azad University, Fars, IR
2 Department of Microbiology, College of Science, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, IR
3 Department of Systems Biology, Agricultural Biotechnology Research Institute of Iran, Karaj, IR
1 Department of Microbiology, Science and Research Branch, Islamic Azad University, Fars, IR
2 Department of Microbiology, College of Science, Agriculture and Modern Technology, Shiraz Branch, Islamic Azad University, Shiraz, IR
3 Department of Systems Biology, Agricultural Biotechnology Research Institute of Iran, Karaj, IR
Source
Nature Environment and Pollution Technology, Vol 17, No 2 (2018), Pagination: 413-420Abstract
Recent studies have shown that oilfield harbours diverse microbial communities. Water-flooding is believed to be the main contaminating factor of oil reservoirs, however, less attempts have been made to study the effect of natural gas injection on microbial community of oilfields. Molecular methods were used to evaluate the microbial diversity of Haftkel (HK) and Lali (LA) petroleum reservoirs in the south of Iran. The HK oilfield has been injected with natural gas for long duration, but LA oilfield had no enhanced oil recovery (EOR) process. Next generation sequencing (NGS) of 16S rRNA archaeal genes indicated that the genus Methanofollis was observed with high presence in 89.7% and 92.6% frequency in the HK and LA oilfields, respectively. Most abundant phyla in HK oilfield were Synergistes (58.1%), Firmicutes (17%), Proteobacteria (Betaproteobacteria) 12.8% and unclassified bacteria (5.2%), while Thermotogae (78%), Firmicutes (10.8%), Synergistes (4%) and unclassified bacteria (3.8%) were observed in LA oilfield. The comparison of the results indicated that the injection of natural gas could increase bacterial diversity and most probable cause to increase frequency of bacterial genus Anaerobaculum belonging to the Synergistes.Keywords
Iranian Oil Reservoir, Natural Gas Injection, Microbial Community, 16s rRNA.References
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