Abstract
The chemotactic response of Thiobacillus ferrooxidans toward thiosulfate was observed. The traditional assay technique was modified by direct microscopic enumeration of cells which moved into the attractant solution. The optimum concentration shown by thiosulfate-grown cells, tetrathionate-grown cells as well as iron-grown cells was 103 times the optimum concentration shown by cells grown on elemental sulfur. Iron-grown cells which lack thiosulfate-oxidizing activity showed increased accumulation at optimum concentration as compared to cells grown on elemental sulfur and other reduced sulfur compounds. This indicated the constitutive nature of chemotaxis by T. ferrooxidans toward thiosulfate.
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