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Articles by M. Yunesian
Total Records ( 5 ) for M. Yunesian
  M. Mohammadian Fazli , A. R. Mesdaghinia , K. Naddafi , S. Nasseri , M. Yunesian , M. Mazaheri Assadi , S. Rezaie and H. Hamzehei
  Synthetic dyes are extensively used in different industries. Dyes have adverse impacts such as visual effects, chemical oxygen demand, toxicity, mutagenicity and carcinogenicity characteristics. White rot fungi, due to extracellular enzyme system, are capable to degrade dyes and various xenobiotics. The aim of this study was to optimize decolorization of reactive blue 19 (RB19) dye using Ganoderma sp. fungus. Response Surface Methodology (RSM) was used to study the effect of independent variables, namely glycerol concentration (15, 20 and 25 g/L), temperature (27, 30 and 33 °C) and pH (5.5, 6.0 and 6.5) on color removal efficiency in aqueous solution. From RSM-generated model, the optimum conditions for RB19 decolorization were identified to be at temperature of 27°C, glycerol concentration of 19.14 mg/L and pH=6.3. At the optimum conditions, predicted decolorization was 95.3 percent. The confirmatory experiments were conducted and confirmed the results by 94.89% color removal. Thus, this statistical approach enabled to improve reactive blue 19 decolorization process by Ganoderma sp. up to 1.27 times higher than non-optimized conditions.
  N. Rastkari , M. Yunesian , R. Ahmadkhaniha and H. Jabbari
  Methyl tert-butyl ether, ethyl tert-butyl ether and tert-amyl methyl ether are oxygenated compounds added to gasoline to enhance octane rating in replacement of alkyl–lead compounds. In the present study the excretion of urinary methyl tert-butyl ether, ethyl tert-butyl ether and tert-amyl methyl ether were evaluated as biomarkers of exposure to gasoline. With this aim, 10 policemen engaged in traffic control, 10 gas station workers and ten occupationally non-exposed persons were investigated. Spot urine samples were obtained prior to and at the end of the work shift from each subject. The urinary levels of oxygenated ethers were determined by using head-space gas chromatography and mass spectrometry detection. There were significant differences among the mean urinary concentrations of methyl tert-butyl ether in pre-shift samples of gas station workers (1193 ng/L), policemen (734 ng/L) and occupationally non-exposed persons (49 ng/L). The mean urinary concentrations of methyl tert-butyl ether and tert-amyl methyl ether differed significantly among post-shift samples of gas station workers (16636 and 8655 ng/L), policemen (14458 and 1472 ng/L) and occupationally non-exposed persons (324 and 59 ng/L) (ANOVA: p<0.05 and Kruskal-Wallis test: p<0.05). There was a significant difference in methyl tert-butyl ether concentrations between job categories (p<0.05 by ANOVA and Kruskal-Wallis test ), and gas station workers and policemen were found to be probably the most exposed groups in this study.
  N. Rastkari , M. Yunesian and R. Ahmadkhaniha
  Bisphenol A and bisphenol F are chemical substances widely used in industry as monomers in the production of epoxy resins and polycarbonates, and as antioxidants in PVC. Epoxy resins are used as inner surface coating of food and beverage cans. The contamination of cans’ content by bisphenol A and bisphenol F may pose a serious threat to human because of their estrogenic activity. In this study, the concentration of bisphenol A and bisphenol F in 48 cans of different kinds of foods (corn, tomato paste, stew and tuna fish) were determined by gas chromatography-mass spectrometry after solvent extraction with acetonitrile and preconcentration by headspace-solid-phase microextraction (HS-SPME). Quantitative analysis was carried out based on spiked calibration samples and analyses were performed for each sample in triplicate. Bisphenol F was not detected in any of the canned foods with detection limits of 0.10 μg/kg.There were significant differences among the mean concentrations of bisphenol A in all kinds of canned foods. The mean concentrations of bisphenol A increased significantly all samples after heating in (ANOVA p<0.05 and Kruskal-Wallis test p<0.05); also tuna fish samples were found to be probably the most polluted groups in this study.
  G.H.R. Jahed Khaniki , F. Vaezi , M. Yunesian , R. Nabizadeh and G.H.A. Paseban
  The objective of this study is evaluation of direct pH metery and alkalinity measurement methods for determination of baking soda in lavash bread (a kind of flat bread) in order to introduce and recommend a good practice of control. For running the experiments, various samples of lavash bread having different concentrations of baking soda were prepared. Ten grams of each sample were mixed with distilled water and then the prepared solutions were filtrated. The filtrates were then analyzed for pH and total alkalinity according to the distractions described in Standard Methods. Results show a significant correlation between the pH values of bread samples and the amount of baking soda. Also, a positive correlation has been observed between the alkalinity of bread samples and used baking soda. By comparing the R2-values specified for these two methods it could be concluded that the direct pH metery method is more reasonable. Furthermore, by this simple method it is possible to accelerate the detection of minute amounts of this chemical in bread.
  M Dehghani , S. Nasseri , S. Amin , K. Naddafee , M. Taghavi , M. Yunesian and N. Maleky
  In this study several agricultural fields with a long history of atrazine application in Fars province of Iran have been explored for their potential of atrazine biodegradation. After several subculturing for a period of 300 days acclimation, leads to an enhancement of atrazine biodegradation rate. A successful enrichment culture with a high capability for atrazine degradation was obtained (88%). A combination of enrichment culture technique, in a basal salt medium containing atrazine and carbon sources under nitrogen limitation and plating on indicator atrazine agar, have permitted the isolation of bacterial consortium with high capability of using atrazine as a nitrogen source. Seven gram-negative and one gram-positive bacterial strain, which were able to use this herbicide as a sole source of nitrogen, were isolated from Darehasalouie Kavar corn field soil. Based on physiological, biochemical and nutritional characteristics, the isolated bacteria were identified as Pseudomonas alcaligenes, Acidovorax sp., Pseudomonas putida, Ralstonia eutrophus, Pseudomonas syiringe, Erwinia tracheiphila, Entrobacter agglomerans and Micrococcus varians. Therefore, the bacterial consortium in liquid culture containing carbon sources and atrazine as a sole source of nitrogen, degrade added atrazine more than 80%.
 
 
 
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