Abstract

The effect of Cr, Ni and Mo and Fe ions on proliferation and activity of hydrogenase in the planktonic population of two marine isolates of sulphate reducing bacteria (SRB) grown in batch cultures was determined by using techniques of gas chromatography. The activities of hydrogenase in the planktonic population of SRB and population present in biofilms generated on mild steel surfaces were compared. Results showed that the presence of different metal ions had different effects on bacterial growth rates as well as on the activity of the hydrogenase enzyme. The activity of hydrogenase not only varied between SRB isolates but also between sessile and planktonic population of the same isolate.

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