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Articles by N. Mirzaei
Total Records ( 2 ) for N. Mirzaei
  N. Mirzaei , F. Kafilzadeh and M. Kargar
  Different mercury contaminated areas of the Kor River were surveyed for detection of mercury resistant bacteria. The samples were collected from four stations throughout the Kor River in four seasons. Amount of total mercury in the samples was determined using cold vapor atomic absorption spectrophotometery. The response of bacterial communities to toxic effects of Hg was monitored by enumerating the number of bacteria on agar containing 10 mg L-1 HgCl2 and with out Hg (II). Isolation of mercury resistant bacteria was performed using the primary enrichment culture method and directly plating on agar containing 10 mg L-1 HgCl2 Hg (II). Total viable counts ranged from 6.5X106 to 2.2X107 cfu g-1 in different stations. Frequencies of mercury resistant bacteria were 42.5% in Pole Khan Station and 3.14% in Droodzan Station. These stations were the most contaminated and uncontaminated areas of the Kor River, respectively. Pseudomonas sp., E. coli, Serratia marcescens, etc. was identified as mercury resistant bacteria. Using the primary enrichment culture method has permitted more effective isolation of Hg resistant bacteria. Present results showed that enhancement of mercury pollution in the environment will increase the probability of the isolation of Hg resistant bacteria.
  F. Kafilzadeh and N. Mirzaei
  Different bacterial species were isolated from different areas of the Kor River and growth pattern of these bacteria were evaluated. In this study the samples were collected from four stations throughout the Kor River in four seasons. Isolation of mercury resistant bacteria was performed using the primary enrichment method and directly plating on agar containing Hg(II). Growth kinetics of most mercury resistant and sensitive bacteria were studied in LB broth containing 20 mg L-1 HgCl2 per liter. Pseudomonas sp., E. coli, Serratia morcescens, etc. was identified as mercury resistant bacteria. Isolated bacteria from the most mercury polluted stations showed high levels of resistance to this toxicant. Growth curve of mercury resistant bacteria was obtained the same as the standard growth curve of bacteria. Present results showed that enhancement of mercury levels in the environment will increase the levels of resistance to mercury among the bacterial communities residing in this contaminated sites.
 
 
 
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