arezoo Tahmourespour - Academia.edu (original) (raw)

Papers by arezoo Tahmourespour

Journal of Water and Wastewater; Ab va Fazilab ( in persian ), Nov 1, 2015

PAHs are toxic compounds with carcinogenic effects on humans that are released into the environme... more PAHs are toxic compounds with carcinogenic effects on humans that are released into the environment by incomplete combustion of fossil fuels. Three methods are commonly employed for PAHs pollutant removal: physical, chemical, and biological. From among these, the biological method which typically contains microbial processes and transforms pollutants to nontoxic or less toxic substances is the most innocuous and effective solution. In this study, attempts were initially made to enrich, isolate, and purify indigenous bacteria from PAHs polluted soil. In the second stage, the PCR method was exploited to identify the bacteria that had the capability of growth and reproduction in polluted conditions. It was found that the degrading bacteria are component species of gram negative bacilli determined as Shewanella, Pseudomonas, and Achromobacter. The results of the present study indicate that the bacteria have the best performance in PAHs removal from polluted environments.

Res Dent Sci, Oct 15, 2014

ABSTRCAT Background and Aim:The main purpose of periodontal treatment is to alleviate the clinica... more ABSTRCAT Background and Aim:The main purpose of periodontal treatment is to alleviate the clinical symptoms of inflammation. Photodynamic therapy which consists of light source and photosensitizer is believed to be influential as an adjunct to the conventional treatment in periodontitis. The aim of this study was to clinically compare the effect of using a single episode of photodynamic therapy as an adjunct treatment to scaling versus scaling per se within a three-month period in patients with chronic periodontitis in Isfahan. Materials and Methods: This interventional clinical trial was performed on 20 patients with mild to moderate chronic periodontitis, with pocket depth of 3-6mm and bleeding on probing in at least 3 teeth. Based on splitmouth design, each patient received scaling in one quadrant (as control group) and scaling accompanied by photodynamic therapy in the other one (as the case group). Clinical parameters including pocket depth, clinical attachment loss, bleeding on probing and papillary bleeding index were measured initially and 90 days after treatment. The results were analyzed using Independent T-Test, Paired T-Test, Mann-Whitney and Wilcoxon Tests. Results: Bleeding indices decreased significantly, with a significant difference between two groups. (p<0.001) Although, the difference of reduction in pocket depth and clinical attachment loss was not significant between two groups (p= 0.61 and p= 0.14 respectively), decrease in these parameters after treatment was significant in each group (P<0.001). Conclusion:Using a single episode of photodynamic therapy was beneficial for reducing bleeding indices but it did not have extra clinical effects when compared with scaling per se.

مجله دانشکده دندانپزشکی اصفهان, Jan 2, 2014

Ecotoxicology, Sep 21, 2018

Soil pollution occurring at mining sites has adverse impacts on soil microbial diversity. New app... more Soil pollution occurring at mining sites has adverse impacts on soil microbial diversity. New approaches, such as metagenomics approach, have become a powerful tool to investigate biodiversity of soil microbial communities. In the current study, metagenomics approach was used to investigate the microbial diversity of soils contaminated with different concentrations of lead (Pb) and zinc (Zn). The contaminated soils were collected from a Pb and Zn mine. The soil total DNA was extracted and 16S rDNA genes were amplified using universal primers. The PCR amplicons were sequenced and bioinformatic analysis of metagenomes was conducted to identify prokaryotic diversity in the Pb-and Zn-contaminated soils. The results indicated that the ten most abundant bacteria in all samples were Solirubrobacter (Actinobacteria), Geobacter (Proteobacteria), Edaphobacter (Acidobacteria), Pseudomonas (Proteobacteria), Gemmatiomonas (Gemmatimonadetes), Nitrosomonas, Xanthobacter, and Sphingomonas (Proteobacteria), Pedobacter (Bacterioidetes), and Ktedonobacter (Chloroflexi), descendingly. Archaea were also numerous, and Nitrososphaerales which are important in the nitrogen cycle had the highest abundance in the samples. Although, alpha and beta diversity showed negative effects of Pb and Zn contamination on soil microbial communities, microbial diversity of the contaminated soils was not subjected to a significant change. This study provided valuable insights into microbial composition in heavy metals-contaminated soils.

Environmental Geochemistry and Health

PISTACHIO AND HEALTH JOURNAL, 2020

Journal of Gorgan University of Medical Sciences, 2013

Background and Objective: Pollution due to the heavy metals is a problem that may have negative c... more Background and Objective: Pollution due to the heavy metals is a problem that may have negative consequences on the hydrosphere. Identification of microorganisms resistant to heavy metals plays an important role in relation to environmental pollution bioremediation. This study was done to assess the antibiotic resistance in isolated bacteria from urban sewage and copper smeltery industrial wastewater. Materials and Methods: This laboratory study was done on the wastewater samples from urban sewage and copper smeltery in Isfahan-Iran, during 2011-12. Heavy metal resistant microorganisms were isolated and enumerated after serial dilution and culturing on PHG agar plates supplemented with 0.5 mM of each heavy metal. The pattern of resistance was assigned by Minimum Inhibitory Concentration (MIC). Antibiotic resistance toward following medicines Ofloxacine, Penicilline, Sulfometoxasole, Lincomycin, Kanamycin, Streptomycin, Clindamycin, Vancomycin, Cefradin and Neomycin were subsequently...

Sustainable Water Resources Management, 2020

One of the drinking water usages is flushing, e.g. toilet flush tank. Gray water is an option to ... more One of the drinking water usages is flushing, e.g. toilet flush tank. Gray water is an option to prevent water loss and, on the other hand, the formation of sediment and mass inside the reserving tank has a significant impact on the performance of the flush tank and customers' satisfaction. In this study, the condition of flush tank, in the respect of bacterial and scum formation, fed by simulated gray water was investigated. The gray water was pre-treated in a septic tank. Flush tanks made of PE, ceramic and galvanized steel sheet were used. The effect of disinfection process was studied for biomass accumulation control. The results from pH, XRF, AAS and bacterial colony count indicated that blue toilet tablet was not effective, while UV lamp effectively controlled bacterial growth. No bacterial growth was observed in the galvanized tank even without any disinfector agent. Applying UV lamp caused scum to form on the surface tank. Generally, no accumulation of suspended solids was observed in the all flush tanks (PE, ceramic and galvanized). Kitchen wastewater can be used in the toilet flush tank as an alternative for potable water.

Journal of Environmental Health Science and Engineering, 2017

Background: Biological methods of polycyclic aromatic hydrocarbons (PAH) contamination eliminatio... more Background: Biological methods of polycyclic aromatic hydrocarbons (PAH) contamination elimination typically involve the transformation of contaminants to non-toxic materials by microorganisms and plants and appear to be the most effective methods available. Methods: In this study, Bacillus licheniformis and Bacillus mojavensis isolated from oil-contaminated soils were inoculated onto Festuca arundinacea seeds before planting in the pot and 3 weeks after planting by syringe injection into the rhizospheric zone in order to study the elimination of PAHs from Festuca's rhizosphere in the greenhouse. Some physical and chemical properties of the soil, PAH concentrations, seeds germination percentage, root and shoot biomasses of the treated samples were examined. Results: The results showed that the treated samples inoculated with both bacteria had a significantly higher percentage of seed germination and root and shoot biomass compared to other treatments. The concentration of some PAHs reduced significantly (Pvalue < 0.05) in the rhizosphere of the treated samples inoculated with both bacteria compared to in contaminated soils. Concentrations of some PAHs (eg. Naphthalene, Phenanthrene, Benzo[a]anthracene and Dibenzo[a,h]anthracene) even reached below the detection limit of the method. The PAHs concentrations in the treated samples inoculated with bacteria was decreased significantly (Pvalue < 0.05). Therefore, the results showed the high efficiency of the Festuca and bacterial inoculation in eliminating PAHs from the soil. Conclusion: According to the results, the partnership of Festuca with B. licheniformis and B. mojavensis isolates displayed positive effect on PAHs dissipation and can be effective cleanup technology with high performance.

Journal of Advances in Environmental Health Research, 2022

Background: Farmers have been persuaded to use wastewater in agriculture due to drought and water... more Background: Farmers have been persuaded to use wastewater in agriculture due to drought and water deficiency. However, an important challenge is the environmental constraints. Methods: This study investigated the effect of vermifiltration on the properties of sewage influent. The sewage influent was obtained from the aerated lagoons of the Qahdarijan wastewater treatment plant, Isfahan Province, Iran. The sewage was mixed with Rice Husk (RH) and Wheat Straw (WS) as the bulking agents at three proportions (0%, 5%, and 10%v/v). Then, EarthWorm (EW) (Eisenia fetida) were added to the sewage sludge in two proportions (0 and 50 adult earthworms/6 kg sewage sludge). Results: The results showed a significant decrease in electrical conductivity (about 100% decrease compared to the control), total dissolved solids (up to 3 times in RH0+ EW treatment less than the control), total suspended solids (up to 90 times in WS10+EW and RH+EW treatments decrease compared to the control), biochemical ox...

is a carbonic compound that is dangerous for humans at a concentration of 0.5 ppm in the environm... more is a carbonic compound that is dangerous for humans at a concentration of 0.5 ppm in the environment. The best phenol removal from coal tar wastewaters is achieved by bioremediation. In this study, we isolated indigenous bacteria from phenolic wastewater and adapted it to a high concentration of phenol for its removal from wastewater. We also investigated the growth and removal curves of the bacteria in media with 2000 and 4000 ppm of phenol. It was observed that after lag phases of 24 and 48 hours, they grew and removed all of the phenol concentration over 264 and 312 hours. It was also found that this isolate was able to remove 2233 ppm of phenol in natural wastewater over a period of 120 hours. Identification tests showed that it is a gram-negative bactetium possibly belonging to the pseudomonas species. Phenol concentrations in wastewater can be reduced over a shorter period of time by using either this isolate alone or a group of them.

Environmental Monitoring and Assessment

Dental Research Journal

Background: The reduction of Streptococcus mutans from the oral cavity or its adherence to tooth ... more Background: The reduction of Streptococcus mutans from the oral cavity or its adherence to tooth surfaces can prevent or decrease the progression of caries. In this study, the antimicrobial and anti-adherence properties of Pistacia atlantica (P. atlantica) resin (Essential oil [EO] and methanolic extract [ME]) were investigated on S. mutans strains. Materials and Methods: In this in vitro experimental study, the growth rate, biofilm formation ability, and antibiotic susceptibility profile of S. mutans ATCC35668 and 3 strains isolated from caries lesions were studied. The EO and ME of P. atlantica resin were prepared. The anti-bacterial and anti-adherence properties of them were evaluated using microdilution and microplate adherence tests, respectively. The data were statistically analyzed using SPSS with one-way and two-way analysis variance. Direct comparisons between the groups were made using the Wilcoxon W-Mann-Whitney U-test. Statistical significance was set at P < 0.05. Results: All target strains showed the same growth rate and antibiotic susceptibility profile and were found strongly adherent. Both EO and ME showed moderate anti-bacterial properties (growth reduction up to 47.1% and 39.1%, respectively) against S. mutans, while the anti-bacterial effect of EO was higher than ME, significantly (P < 0.05). In all tested concentrations, EO showed a significantly stronger anti-adherence activity (50%-80%) than ME. Conclusion: The results showed an anti-cariogenic effect of EO extracted from P. Atlantica resin. Considering that S. mutans adhesion is a necessary step in the beginning and progression of dental caries, this study can suggest the use of such extract in mouthwashes or toothpaste as an alternative agent for preventing bacterial attachment and biofilm formation.