This study demonstrates differences in ATP levels between attached and planktonic cells of Acidithiobacillus ferrooxidans growing with elemental sulfur. A small fraction of 3.7–14.4% of the bacterial cells was attached to the sulfur particles. The highest cell attachment of 14.4% was at the end of the lag phase, decreasing to 3.7% into the latter part of the active growth phase. Therefore, attached cells and their ATP content made a minor contribution to the total culture biomass in the active growth phase. However, the cellular ATP content was 1.01 amol per attached cell and 0.34 amol per planktonic cell. The significantly (P < 0.01) lower ATP content was attributed to sulfur limitation in the planktonic cells. These results suggest that a negligibly small subpopulation may be a link in cooperative interaction whereby sulfur oxidation by attached cells under boundary conditions provides bioavailable substrates to planktonic cells in the population.
Bibliographical noteNOTICE: this is the author’s version of a work that was accepted for publication in Process Biochemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Process Biochemistry, [48,] , (2013)] DOI: 10.1016/j.procbio.2013.07.026
© 2013, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
- Acidithiobacillus ferrooxidans
- Attached bacterial cells
- Cellular carbon
- Sulfur oxidation