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Articles by H. Zolgharnein
Total Records ( 6 ) for H. Zolgharnein
  H. Zolgharnein , K. Karami , M. Mazaheri Assadi and A. Dadolahi Sohrab
  In the present study, uptake of heavy metal ions by Pseudomonas aeruginosa strain MCCB 102 isolated from the Persian Gulf was investigated in two single and multi-mix forms. The highest adsorption was observed for Cu, Zn, Cd and Pb, respectively. Removal of metals was maximized when the metal ions was in a single form. Scanning Electron Microscope (SEM) analysis showed Pseudomonas aeruginosa strain MCCB 102 accumulated heavy metals in the cell wall and along the external cell surfaces. This suggested that heavy metals uptake involves both surface phenomena and diffusion. EDX and SEM studies emerged as the best approach to monitor heavy metal adsorption on the bacteria cells and as an alternative method for measuring heavy metals in the bacteria. Energy Dispersive X-ray (EDX) analysis was less sensitive and less reliable compared to atomic absorption analysis, but was rapid and easier to direct heavy metals in the bacteria.
  M.A.Salari Aliabadi , S. Rezvani Gilkolaei , A. Savari , H. Zolgharnein and S.M.B. Nabavi
  Genetic divergence within and between wild populations of cobia, Rachycentron canadum (L.) was assessed by means of microsatellite analysis in the Persian Gulf and Oman Sea. Ten microsatellite markers were used to estimate the level of genetic diversity within six wild populations of cobia and the degree of genetic differentiation between them was compared. Mean observed and effective allele number was 12.357 and 8.319, respectively. Mean observed and expected heterozygosity was 0.655 and 0.874, respectively. Based on Analysis of Molecular Variance highest F-statistics (0.063) was observed when comparing specimens from Dayer Port zone and Pozm of Chabahar zone. Highest genetic distance (0.258) and lowest genetic resemblance (0.223) were observed between specimens from Dayer Port zone and Beris of Chabahar zone. The present study showed that at least three different populations of Rachycentron canadum were found in the northern coasts of Persian Gulf and Oman Sea.
  H. Zolgharnein , K. Karami , M. Mazaheri Assadi and A. Dadolahi Sohrab
  A total of 35 heavy metals resistance and removal bacterial strains were isolated from samples of marine environment and enclosed industrial areas. All isolates were characterized by molecular method. The diversity of isolated bacteria was examined by the phylogenetic analysis of 16S rRNA gene sequences. The phylogenetic analysis of the sequences revealed seven main taxonomic lineages. The phylogenetic tree illustrated discrimination between isolated bacteria from wastewater, industrials area and marine environment. Results showed new genetic differences and relationship between marine and industrial strains. Some Pseudomonas strains isolated from marine environment were well differentiated from those of industrial wastewater. Members of the genera Delftia and Bacterium formed a monophyletic group within the subdivision of the class. There was a clear differentiation between two groups of Pseudomonas and other groups of bacteria in the phylogenetic tree.
  H. Zolgharnein , M. Kamyab , S. Keyvanshokooh , A. Ghasemi and S.M.B. Nabavi
  Genetic variation of four populations of Avicennia marina encompassing the Iranian coastal areas of Persian Gulf were studied using five microsatellite loci. The average number of alleles per locus per population ranged from 4 to 4.6, showing no significant difference among the four populations. The observed heterozygosity (Ho), ranging from 0.782 to 0.960 with an average of 0.864, was comparable in the Iranian populations and much higher comparing to the earlier studies on A. marina in the worldwide range. Significant to highly significant deviations from Hardy-Weinberg expectations were observed in 10 out of 20 (five loci H four populations) cases. Most of Fis values were negative and significantly different from zero, thus suggesting excess of heterozygosity. The microsatellite analysis showed low genetic differentiation among the populations (mean Fst = 0.044), which could be explained by the remarkable gene flow (Nm>1) among populations.
  S.R. Kazemi Nezhad , E. Modheji and H. Zolgharnein
  In Iranian coastal waters of the Persian Gulf as a result of both direct and indirect human impacts such as uncontrolled or illegal hunting, sea turtle populations are drastically declining. Information on the genetic structure of marine species is essential for stock enhancement programs. To estimate the genetic diversity of the hawksbill turtle populations, the mitochondrial DNA control region was used as a matrilineal marker. The captured turtles (69 samples) were obtained from three different islands in the Persian Gulf. From all the samples DNA was isolated. The primers were selected based on a specific sequence in control region of mitochondrial genome. PCR products were restricted by various restriction enzymes and four different haplotypes observed. Measurement of inter-population genetic diversity and evolutionary distance between genotypes showed a low diversity in mitochondrial genome of hawksbill turtle in the studied regions. Therefore, the similarity between these three populations was significant. Present results provide evidences showing that significant genetic variation was not observed between these distinct populations and there is not even enough evidence to show the separation and diversion in the studied populations in haplotype level.
  Y. Nikpour , H. Zolgharnein , M. Sinaei , H. Najafzadeh and M. Ghavasi
  The effect of mercury exposure to total Metallothionein (MT) response and bioaccumulation under control and acute mercury exposure were investigated in scats (Scatophagus argus). Scats were exposed to different mercury concentrations (10, 20 and 30 μg Hg L-1) for 24, 48 and 72 h. Total MT levels were determined by Enzyme-Linked Immunosorbent Assay (ELISA) method. Mercury contents were determined through cold Vapour atomic Absorption spectrometry. Induction of MT during exposure was tissue specific, displaying different response pattern in gill and liver. Mercury accumulated much stronger in liver than gill and the latter also showed lower MT level. MT biosynthesis in liver showed a significant increase after exposure to different mercury concentration during different times. This increase was significantly correlated with mercury bioaccumulation. In contrast, presence of different mercury concentration during different times did not significantly modify total MT except for 72 h exposure at 30 μg L-1 in gills. The results suggest that this form of MT existing in S. argus was Hg-inducible and could be extended the as a biomarker of mercury pollution in ecosystems.
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