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Test for the inhibitory action of the heavy metals.

6- Dip the disc into one of the heavy metal solution, then place the disc in the center of each plate. 7- Repeat the procedure for each heavy metal solution provided. 8- Incubate all plates at 28 ° C for 48 hours..

Comment :-. Most peas, metals, such as silver , copper , zinc , cadmium and mercury , either alone or in certain compounds, have harmful effects on microorganisms . Several compounds of heavy metals have antiseptic or germicidal activity and used used to control microorganism. The ability of small quantities of certain metals to exert toxic effects on microorganisms is referred to as oligodynamic action , and this cause formation of inhibition zone..

The oligodynamic action is believed to be caused by the affinity of certain cellular proteins for metallic ions, which results in the accumulation of large amounts of these ions and denaturation of these cellular proteins..

Results:-. abstract. The inhibitory action of the heavy metals.