Solubilization of Cu2+ from copper ore by iron-oxdizing bacteria isolated from the natural envrionment and identification of the enzyme that determines Cu2+ solubilization activity
1996
Sugio, T. (Okayama Univ. (Japan). Faculty of Agriculture) | Akhter, F.
Solubilization of Cu(2+) from copper concentrate by 67 strains of iron-oxidizing bacteria isolated from the natural environment was studied. In the case of static growth on copper concentrate (5%)-salt medium (pH 2.5) at 30 degrees C, Cu(2+) solubilization activities of 65 strains including Thiobacillus ferrooxidans strains AP19-3, OK-2, OK-3, OK-1-50, Funis and NASF-1 ranged from 2.5-3.5 mg Cu(2+)/ml/33d. In contrast, the activities of T. ferrooxidans strains KO-1 and NA-1 were quite low at 0.9 mg Cu(2+)/ml/33d. Nonbiological solubilization activity of Cu(2+) was 0.4 mg Cu(2+)/ml/33d. For identification of the enzymes that play a crucial role in biological Cu(2+) solubilization, the activities of the enzymes involved in iron and sulfur oxidations were compared among the strains described above
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