Showing 5 results for Jookar Kashi
F. Jookar Kashi, P. Owlia, M.a. Amoozegar,
Volume 9, Issue 1 (Winter 2018)
Abstract
Aims: Microorganisms are present not only in common environment, but also in extreme environments. Salt lakes with near or at saturating salinity are spread all over the world. Urmia Salt Lake is one of these hypersaline environments. The present study aimed at evaluating prokaryotic diversity in hypersaline environment by culture-independent method.
Materials and Methods: In this experimental study, different regions of Urmia Lake were sampled and the genomic material extracted from the water sample was used as a pattern for the amplification of 16S rDNA and a fragment of the bop gene via polymerase chain reaction. By cloning, each of the amplified fragments belonging to a single strain was amplified by T/A cloning vector. To further investigate the biodiversity of Haloarchaea, the biodiversity of bop gene was studied in addition to studying 16S rDNA.
Findings: By cloning and sequencing, 6 bacteria genera, including Acaryochloris, Adhaeribacter, Brachybacterium, Gloeocapsopsis, Cesiribacter, and Bacillus were identified. Archaeal library belonged to 5 genera, including Halonotius, Halolamina, Haloquadratum, Halomicroarcula, and Halorhabdus. The clone libraries of bacterial belonged to 4 phyla, including Bacteroidetes, Cyanobacteria, Actinobacteria, and Firmicutes. . The clone libraries of bop gene (as a molecular marker) belonged to genera, including Halorubrum, Natrialba, Haloquadratum, and Natrinema. The bop phylogeny was closely related to the 16S rDNA phylogeny.
Conclusion: By cloning and sequencing, 6 bacteria genera, including Acaryochloris, Adhaeribacter, Brachybacterium, Gloeocapsopsis, Cesiribacter, and Bacillus were identified. The bop phylogeny is closely related to the 16S rDNA phylogeny.
Z.s. Seyedi , Z. Zahraei , F. Jookar Kashi ,
Volume 10, Issue 1 (Winter 2019)
Abstract
Aims: The dyes are high usage chemical compounds in textile industry. Discharge of colored effluent to the water sources, effect on the unpleasant appearance and the solubility of gases. The dyes reduce light penetration to the lower layers of water and photosynthetic activity. They caused cancers and variety of mutations. In this research, the decolorization ability of Reactive Red 152 dye by isolated strains from textile wastewater was measured, also environmental conditions were optimized.
Materials and Methods: In this experimental study, the bacterial strains were isolated from samples collected from different parts of textile wastewater. The dye decolorizing bacteria were screened. The decolorization ability of the strains was evaluated under different conditions such as incubation time from 0 to 72 hours, pH 6 to 9, different dye concentrations from 50 to 400mg/l and different carbon sources.
Findings: Ten strains were isolated from Kashan textile wastewater that 4 strains showed high ability in decolorization. The highest decolorization was observed after 48 hours, pH=9, 50mg/l concentration of dye and glucose as carbon source.
Conclusion: Textile wastewater contains bacterial strains which have high decolorization ability. Therefore, we can use these bacteria for decolorization of wastewater dyes.
Mohammad Goodarzi, Hossain-Ali Rafiee-Pour, Fereshteh Jookar Kashi,
Volume 11, Issue 1 (Winter 2020)
Abstract
The waste produced by households, industry and factories to use as wash water and cooling systems and equipment, is caused environmental complications. Waste created a suitable environment for the growth of odor and pathogenic bacteria. This study aimed to isolate microorganisms in the wastewater and use them for the reduction of BOD (biochemical oxygen demand) and COD (chemical oxygen demand).The samples were collected aseptically from different parts of wastewater of herbal distillation industry. The bacterial strains were isolated from the samples in LB media. The isolates were distinguished based on the morphology and biochemical characteristics. Among the total 69 isolates, four isolates were selected to measure the ability to reduce BOD and COD and added to the waste water. Reduction of BOD was measured using BOD meter. Also, COD was determined by titration method. The isolates were identified by biochemical tests. The amount of BOD and COD reduction after adding selected strains to wastewater was 47.43 - 71.82% and 44.79 - 56.5% respectively. Also, the consortium of bacterial strains showed better ability to reduce BOD and COD (38.32-57.29%and 76.6-83.21% respectively). The results determined that wastewater contains bacterial strains which have shown significant reduction in BOD and COD and organic matter decomposition in wastewater and reuse it in agricultural and industrial sectors. Therefore, we can use these bacteria for wastewater treatment.
Hadis Kordzangeneh, Fereshteh Jookar Kashi,
Volume 13, Issue 4 (1-2023)
Abstract
This study aimed to isolate and identify bacteria from soils contaminated with copper and have access to a capable bacterial strain for producing copper nanoparticles (CuNPs). The present study showed the extracellular production of copper nanoparticles using strain Ta-31. The effect of various factors such as substrate, supernatant volume, enzyme inducer, and electron donor was investigated on the production process. The properties of synthesized nanoparticles were identified by using UV-Vis, FTIR, XRD, SEM, and EDS analysis.
Moreover, the growth curve of strain Ta-31 was plotted in the presence and absence of an enzyme inducer (concentration of 0.1 mM copper sulfate). After the phylogenetic analysis, 16S rDNA gene sequences were determined, and their phylogenetic tree of the selected strain was plotted. The results showed that the best conditions for producing CuNPs, glucose 1% as an electron donor, 2 mM copper sulfate, and 20 ml supernatant had the best production. Strain Ta-31 arrived at the end of the log phase and the beginning of the stationary phase after 15 h. CuNPs were spherical and irregular, and the size of CuNPs was more in the range of 30-40 nm. According to the results, strain Ta-31 belonged to Staphylococcus pasteuri sp. with 99.88% similarity.
Narges Rakhshan, Mohammadreza Mansournia, Fereshteh Jookar Kashi,
Volume 15, Issue 3 (6-2024)
Abstract
The aim of present research is development of a simple green approach to produce Ag/AgCl nanocomposites using bacterial strains Bacillus haynesii and Bacillus halotorans, nominated at PN14F and B3, respectively, via an extracellular process. The bacterial strains PN14F and B3 were isolated from the soil and wastewater samples, using dilution and direct cultivation method. The Ag/AgCl nanocomposites were synthesized from the reaction of silver(I) nitrate solution and supernatant under completely sterile conditions in the presence of light. Moreover, a series of controlled experiments were provided to optimize some reaction conditions such as substrate concentration, PH, substrate volume, bacterial volume, the presence of glucose as an electron donor and silver(I) nitrate as inducer. The products were characterized using various techniques such as UV-Vis, XRD, FT-IR, FE-SEM and EDX. The resulting bionanocomposites (Ag1 and Ag2), with an average particle size of 30 and 22.3 nm, were efficient heterogeneous catalysts for reducing para-nitrophenol to para-aminophenl. Further, it was demonstrated their activity as the antibacterial properties against gram positive and negative bacteria. The results showed that the Ag2 sample with reducing time of 15 min is a more efficient catalyst than the Ag1 nanocomposite, which can be attributed to the smaller size of the Ag2 nanoparticles.
