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| Figure 3: Variation of the antibiotics inhibition zone diameter with the types and concentrations of heavy metals. It illustrated that the bacterial resistance to these four antibiotics was in the order of amoxicillin>cefradine>tetracycline>norfloxacin. The heavy metal of lower concentrations could strengthen the bacterial resistance to most antibiotics. But the bacterial resistance to amoxicillin and cefradine could not be affected obviously by Cr(VI) or Pb2+ of different concentrations. |
