Effect of Heavy Metal Ions on the Growth and Iron-oxidizing Activity of Thiobacillus ferrooxidans |
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Authors: | Kazutami Imai Tsuyoshi Sugio Takanori Tsuchida Tatsuo Tano |
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Institution: | Department of Agricultural Chemistry, Faculty of Agriculture, Okayama University, Okayama |
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Abstract: | Effect of heavy metal ions on the growth and the iron-oxidizing activity of Thiobacillus ferrooxidans were investigated.Cupric, zinc, cadmium, and chromium ions had no effect on the growth and the iron-oxidizing activity of cell suspensions or cell-free extracts of the bacterium in high concentrations (10?3~10?2M). Lead ion delayed the start of the growth slightly in 10?3 M, but it did not inhibit the iron-oxidizing activity of the cells in the concentration. Tin and molybdenum oxide ions inhibited both of them in the concentration above 10?3 M.Mercuric mercurous, and silver ions had the most harmful effect. In the concentration of 10?3 .M, each of the cations inhibited almost completely both the growth and the iron-oxidizing activity of the cells.In the experiments with cell-free extracts it was observed that the activity of cytochrome oxidase (cytochrome a597) operating in the iron-oxidizing system of the bacterium was specifically inhibited with mercuric ion in the concentration above 5 × 10?4 M. |
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Keywords: | metatheria opossum DNA polymerase α chromosomal instability inhibitor |
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