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1
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Antimicrobial activity of some Lactobacillus species against intestinal pathogenic bacteria

100%
Tebyanian H., Bakhtiari A., Karami A., Kariminik A.
International Letters of Natural Sciences
|
2017
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tom 65
Probiotics have antibacterial effects against pathogenic bacteria in the gut while maintaining the balance of intestinal flora such as Lactobacillus. This study aimed to evaluate the antimicrobial activity of four Lactobacillus species against intestinal pathogenic. Four different species of Lactobacillus (Lactobacillus bulgaricus (PTCC 1332), Lactobacillus casei (PTCC 1608), Lactobacillus plantarum (PTCC 1058) and Lactobacillus Fermentum (PTCC 1638)) were experimented to investigate the inhibitory activity against 4 bacterial enteric pathogens (Escherichia coli, Staphylococcus aureus, Shigella dysenteriae and Salmonella paratyphi A) which were separately inoculated in MRS medium (de Man, Rogosa and Sharpe medium) for 48 hours at 37 °C and pH 7. Our results showed that enteropathogens growth was stopped in the presence of all Lactobacillus and inhibition zone was between 12 and 32 millimeter. It can be concluded that these four Lactobacillus strains had potential antimicrobial compounds against human enteric pathogens and should be further studied for their human health benefits.
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Removing lead from Iranian industrial wastewater

88%
Salmani B. K., Amoozegar M. A., Babavalian H., Tebyanian H., Shakeri F.
International Letters of Natural Sciences
|
2016
|
tom 57
Metals and chemicals have been increased in industrial processes which they contain a high level of toxic heavy metals and cause a lot of disadvantages for the environment and human health .Biosorption of Pb (П) ions has been studied from aqueous solutions in a batch system by using a bacterial strain isolated from petrochemical wastewaters. Strain 8-I was selected to study the impact of different factors on removal rate. According to morphological, physiological and biochemical characterizations of the strain and in comparison with other studies the strain was tentatively identified as Bacillus sp strain 8-I. The maximum Lead biosorption capacity of 8-I isolate was determined to be 41.58 % at pH 4.0 with 80 mg/l concentration in 48 hours equilibrium time. The comparison between the biosorption capacity of live (45.50 mg/g), heat inactivated (30.23 mg/g) and NaN3 pretreated biomass (26.86 mg/g) were indicated that the ability of live biomass for both of active and passive uptake of lead.
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Isolation, identification and extracellular enzymatic activity of culturable extremely halophilic archaea and bacteria of IncheBoroun wetland

88%
Rasooli M., Amoozegar M. A., Sepahy A. A., Babavalian H., Tebyanian H.
International Letters of Natural Sciences
|
2016
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tom 56
Extremely halophilic diversity of IncheBroun wetland located in the north of Iran was investigated by using culture-dependent methods. Sampling was carried out in May and September 2014. In each sampling 4 distinct regions of wetland were analyzed by using complex media like MGM, JCM168, MH1 and an alkaliphilic medium containing 23% salts. After incubation at 40˚C, a total of 406 isolates and 2.1 × 106 CFU/ml were obtained in culture media. Among them 361 isolates were obtained from MGM and 39 isolates from JCM 168, 3 isolates from MH1 and 3 isolates from the alkaliphilic media. Initial morphological, biochemical and physiological tests were performed. Production of 4 hydrolytic enzymes by 45 selected strains was assayed qualitatively. A total of 38, 19 and 6 strains were able to produce lipase, DNase and amylase activity. Protease activity was not observed among strains. As total 45 strains were selected randomly and phylogenetic analysis of 16S rRNA was performed for them. Among selected strains 40 isolated strians belonged to Haloarchaea and were belonged to the genera: Haloarcula(30%), Halorubrum(27.5%), Haloferax(17.5%), Halobellus (10%), Halogeometricum(5.2%), Halobacterium(2.6%), Halolamina(2.6%), Halorhabdus (2.6%) and Halostagnicola (2.6%). Haloarcula and Halorubrum were the dominant populations. A total of 5 strains belonged to domain of Bacteria and were similar to members of Rhodovibrio (40%), Pseudomonas (40%) and Salicola (20%).
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Effect of physical and chemical factors in production of alkaline protease enzyme by Bacillus strains

76%
Tebyanian H., Mirhosseiny S. H., Bakhtiari A., Karami A., Dadseresht S., Otroshi B.
International Letters of Natural Sciences
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2018
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tom 71
Proteases is family of enzymes and it has crucial role due to their physiological roles and very valuable commercial applications. Alkaline protease are produced by Bacillus species are particular importance because of their thermal stability and stability at different pH values. This study aimed to investigate the effect of physical and chemical factors in production of alkaline protease enzyme fermentation by members of the genus Bacillus. In this study, alkaline protease enzyme production were evaluated in submerged fermentation by Bacillus strains which were isolated from alkaline soils of Guilan province. Factors incubation were optimized such as time, pH, amount of inoculation and ammonium sulfate in alkaline protease enzyme production whit using response surface methodology (RSM) in culture. The maximum enzymatic activity was observed in incubation time of 36 hours, pH=9, inoculation amount of 15% (V) and ammonium sulfate 1.5% (W/V). Factors had significant effect on the production of alkaline protease enzyme such as pH and ammonium sulfate.
5
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Study on haloalkaliphilic sulfur-oxidizing bacterium for thiosulfate removal in treatment of sulfidic spent caustic

76%
Makzum S., Amoozegar M. A., Dastgheib S. M. M., Babavalian H., Tebyanian H., Shakeri F.
International Letters of Natural Sciences
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2016
|
tom 57
Due to the disadvantages of physiochemical methods for sulfidic spent caustic treatment, attentions are drawn to the environmental-friendly biotreatments including sulfur-oxidizing haloalkaliphiles. Thioalkalivibrio versutus DSM 13738 was grown at alkaline (pH10) autotrophic medium with sodium carbonate/bicarbonate as the sole source of carbon and amended with sodium thiosulfate as the electron and energy source. The effect of various parameters including temperature (25-40 °C), pH (8-11), NaCl concentration (0.5-5 % w/v) and sodium thiosulfate concentrations (100-750 mM) was evaluated on bacterial growth and thiosulfate removal. This strain could eliminate sodium thiosulfate at very high concentrations up to 750 mM. The results showed that the highest specific growth rate was pH 9.5 and thiosulfate removal of Thioalkalivibrio versutus occurred at pH 10.5. The optimum salt concentration for thiosulfate removal was 2.5 % w/v and 5 % NaCl and specific growth rate elevated 2.5% w/v. It was also specified that this strain thrives occurred in 37 ºC and at 35 and 37 ºC higher removal of thiosulfate. Following chemical oxidation of sulfide to thiosulfate, application of Thioalkalivibrio versutus could be promising for spent caustic treatment. Since thiosulfate is utilized as an energy source, highest removal efficiency occurred at marginally different conditions compared to optimal growth.
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Applying In Silico approaches for designing a chimeric InaV/N-DFPase protein and evaluating its binding with diisopropyl-fluorophosphate

64%
Allahyari H., Karami A., Tebyanian H., Nouri H. R., Khodi S., Farnoosh G., Arab S. S., Latifi A. M.
International Letters of Natural Sciences
|
2019
|
tom 75
The N-terminal domain of the ice-nucleation protein InaV (InaV-N) of Pseudomonas syringae was applied to display the DFPase on the cell surface. In silico techniques were used to generate a model in order to examine the possibility of DFPase exhibition on the cell surface. The secondary and tertiary structures of a chimeric protein were determined and then, the predicted model was subjected to several repeated cycles of stereochemical evaluation and energy minimization. The homology-modeled structure of the InaV/N-DFPase protein was docked to DFP. The optimized inaV/N-dfpase gene was translated to 519 amino acids. The minimum free energy of the best-predicted secondary structures was formed by RNA molecules (-215.45 kcal/mol). SOPMA analysis results showed that the main helix peak corresponded to the anchor fragment. Validation of the 3D model indicated that 86.1% of amino acid residues were incorporated into the favored regions. The moldock score was 360.22 for DFP. Results of this study indicated that according to in silico analysis, all of these findings were effective in targeting DFPase.
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