| Autor: |
Podol'skaya, V. I., Ermolenko, A. I., Yakubenko, L. N., Ul'berg, Z. R. |
| Předmět: |
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| Zdroj: |
Colloid Journal; Jul/Aug2003, Vol. 65 Issue 4, p482-487, 6p |
| Abstrakt: |
Electrokinetic properties of thiobacteria in the process of galenite microbial leaching were studied by microelectrophoresis method. It was shown that, in the region of acidic pH, precipitates of oxidized galenite and thiobacterium cells possess low negative electrokinetic potential. The analysis of the contribution of electrostatic and molecular forces, as well as of biospecific factor to the efficiency of interaction between the cell and sulfide mineral was performed. It was assumed that, after the attachment at the sulfide surface, the cells generate a microenvironment with high redox potential and buffer properties that promotes the highest oxidation activity of cells and optimal conditions for sulfide oxidation. With the accumulation of Fe(III) in the environment and the aging of culture, its surface charge grows and the cell tends to leave the microenvironment to find new accessible substrate. Changes in the value of cell surface charge can be of adaptation character and promote optimal functioning of its bioenergetic systems in the redox medium including sulfur and iron. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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