A synergistic effect of copper and nickel ions on the growth rates of Pseudomonas aeroginosa and Staphylococcus aureus isolates | ||
| basrah journal of science | ||
| Article 1, Volume 30, Issue 1, March 2012, Pages 78-93 PDF (0 K) | ||
| Author | ||
| Makia M. Al-Hejuje | ||
| Abstract | ||
| Two isolates of bacteria : Pseudomonas aeroginosa and Staphylococcus aureus were exposed to different concentrations ( 25, 50 and 100 ppm ) of copper and nickel ions (as single and mixed ),and growth rate of these isolates were measured after different exposure periods of ( 0 , 2 , 4 , 24 and 72) hrs. The results were showed that the effect of ions on the growth rate of these isolates were depending on ion type , concentration of ions in the medium , the nature of medium ( solid or liquid ) , the group of bacteria( Gram+ve or Gram-ve ) , and the periods of exposure . Also , the results were showed a synergistic effect caused by the mixture of the two metals ions on the growth rate of these isolates , and this effect including an elongation in the lag phase , decreasing of colonies numbers and colonies diameter , and dead of bacteria according to the ions concentration in the medium | ||
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