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Articles by A. Mashinchian
Total Records ( 5 ) for A. Mashinchian
  A. Khanafari , S. Eshghdoost and A. Mashinchian
  The different methods are used for the removal of heavy metals as important contaminants in water and wastewater. Biosorption is an alternative to traditional physicochemical in removing toxic metals from wastewaters and groundwater resources. In this study biosorption of lead and chromium ions from solution was studied using Bacillus circulans isolated from Anzali wetland in batch and biofilter modes and optimum conditions were determined. The experimental results showed 900-950 mg/L and 1050-1100 mg/L, for minimum bactericidal concentration and minimum inhibitory concenteration for lead and chromium, respectively. Results of metal concentration in solution containing 500 mg/L in batch culture showed a reduction about 65% and 48% in five and four days for lead and chromium, respectively. The highest value of lead and chromium uptake in solution with 500 mg/L was 78% and 40% in biofilter mode, respectively. The biosorption of lead and chromium were increased up to pH=5.5, 6, 5.5 and 7, respectively. In the other hand, maximum sorption occurred at neutral pH. There was a significant decreasing of biosorption levels by lowering pH fewer than 3. Accumulation of lead and chromium was determined by scanning electron microscopy analysis of the biofilm exposed to 500 mg/L metal concentration. Based on this analysis, the highest metal concentrations were observed in regions with including bacteria.
  M. Marjani , S. Jamili , P.G. Mostafavi , M. Ramin and A. Mashinchian
  In the present study, effect of different dose rates of synthetic androgen 17-alpha Methyl Testosterone (MT) i.e., 50, 75 and 100 mg of hormone in per kg of feed, on sex reversal and growth performance of Mozambique tilapia was evaluated. MT was administrated orally by using pellet dry starter and Ethanol Alcohol, diet to tilapia fry for 21 days in glass aquaria. The fry were also kept for 2 weeks after feeding to monitor its growth performance. At the end of the experiment the sex ratio was determined by examining the gonads after dissecting the fish. Growth performance was monitored by recording the morphometric characteristics. Wet body weight and total length of fish on start of feeding end of feeding and two weeks after feeding were measured. The results of the present study showed that all MT receiving treatment showed a significantly higher male proportion than the control experiment. Dose rate of 75 mg kg-1 MT of feed resulted in maximum male population (98.09%) with 1.91% sterilized fish. The dose rate of 75 mg kg-1 MT gave the maximum gain in body weight i.e., 11.8 g, which is 1.2 times greater than the control.
  S. Daei , S. Jamili , A. Mashinchian and M. Ramin
  This study was carried out within inland Aquaculture Research Center Bandar Anzali (Guilan Province) through Southwestern part of the Caspian Sea; to examine the effect of two heavy metals (lead, cadmium) on (Fe) amount in blood of Chalcalburnus chalcoides. This fish is widespread and lives through Southern and Western part of the Caspian. The sampling was randomly done in two stages. The size of fish was 15-16 cm. After transferring fish to the pool, in order to adaptation, has been provided 12 aquariums in which 9 fish were released to each one. Regarding to the lowest capacity (LC50) for these fish, chose the selective densities to pollute aquariums’ environs. In such a way that for each aquarium cell with a constant density, we account 0.05, 0.15 and 0.03 ppm for lead and 0.15, 0.25 and 0.75 ppm for cadmium, respectively; while a stereotype aquarium was considered as a non- polluted environ. In each stage, we left 3 fish out of them to take blood from their heart and tail-stem, then we transferred the frozen samples to the lab. This experiment was repeated for the second metal as the same. Acid nitric digested the blood to provide a transparent and colorless solution for the atomic absorption device. With respect to the obtained absorptions by Pb, Cd and Fe in lab, the variance analysis (ANOVA) was carried out in (SPSS) and (Excel) systems. Based on statistical results, cadmium with ratio p<0.05 replaced with ferritin (Fe) over the time, but metal (Pb) couldn’t so. The results indicated that by increase in lead density within various times, this metal was absorbed by other fish’s tissues.
  F. Darafsh , A. Mashinchian , M. Fatemi and S. Jamili
  The general purpose of this study is investigating the degree of heavy metal accumulation in scales, livers and gonads of the Cyprinus carpio and determining fish scale as the most suitable bioindicator for lead and zinc sedimentation in the environment of the sampling stations. Also, amounts of lead and zinc in the livers, scales and gonads tissues of the Cyprinus carpio are measured and a comparison is made between the amounts measured in the sediments and those measured in the livers, gonads and scales of the fish. Five sampling stations at different districts in the following cities were chosen: Astara, Hashtpar, Bandar Anzali, Ramsar and Chalous. Samples were prepared and classified according to fish organs as sedimental samples, liver samples, scale samples and gonad samples and then lead and zinc levels were measured in them. Results of this study show that fish scale is a better index of zinc content than liver and gonad in addition; fish scale is a better index of lead content than gonad. As no strong correlation was found between lead pollution level in the environment and that in fish scales, it was concluded that fish scale is a weaker index for lead than for zinc. The results obtained of the bioaccumulation of lead in the related tissues was found to be in the following order: Liver average < Female gonad average < Sediments average < Male gonad average < Scales average. The bioaccumulation of zinc in the studied tissues was found to be in the following order: Male gonad average < Sediments average < Female gonad average < scales average < Liver average.
  N. Sajjadi , P. Eghtesadi-Araghi , A. Mashinchian , S. Jamili , S. Farzadnia and M.S. Hashtroodi
  Seasonal variations of fatty acids were studied in the lipid fractions of the bivalve mollusk, Saccostrea cucullata, at the intertidal zone of Chabahar bay in the northern part of Oman Sea (Iran). Samples were collected in rocky shores between two stations. The analysis were carried by GC/MS chromatography. Thirteen fatty acids were identified, of which, the most important saturated fatty acids (SFA) were 14:0, 4, 8, 12 tri Me- 13:0, 16:0 and 18:0, the mono unsaturated fatty acids (MUFA) included 16:1n-9, 18:1n-9 and 20:1n-11, the polyunsaturated fatty acids (PUFA) were linoleic acid 9,12 18:2 , eicosapentaenoic acid EPA 20:5n-3 and arachidonic acid 20:4n-6.Variability of the fatty acid components were studied in four seasons. Maximum percentage level in Saccostrea cucullata for 14:0, 4, 8, 12 tri Me 13:0, 16:0 and 15:0 as saturated fatty acids was observed in summer, while for 18:1n-9, 20:1n-11 and 20:5n-3 (as unsaturated fatty acids) maximum concentration was observed in winter. The environmental factors were monitored monthly and their effects on seasonal variations of the fatty acids were studied by applying pearson coefficient correlation. The results showed the significant dependency of 20:1n-11 fatty acid concentration to ambient temperature and 9,12 18:2 fatty acid to silicate as environmental factors. Also, principal component analysis was done to establish the fatty acid groups. After Varimax rotation, three factors were extracted, of which first and second factors contributed to 86% of the data matrix. These were mainly dependent on the seasonal variations of the fatty acids.
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