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Arsenic toxicity is not due to a direct effect on the oxidation of reduced inorganic sulfur compounds byThiobacillus caldus
Umeå University.
Umeå University.ORCID iD: 0000-0002-9622-3318
Umeå University.
1996 (English)In: FEMS Microbiology Letters, ISSN 0378-1097, E-ISSN 1574-6968, Vol. 145, no 3, p. 409-414Article in journal (Refereed) Published
Abstract [en]

Thiobacillus caldus is a moderately thermophilic acidophile which has been implicated in the biooxidation of arsenic containing mineral sulfides. The toxic effects of arsenic on this bacterium are presented here. Addition of arsenite to a growing culture of T. caldus caused a transient increase in the optical density of the culture while causing a simultaneous decrease in cell viability. The increase in optical density was shown to be due to the formation of extracellular sulfur. The oxidation rates of tetrathionate and thiosulfate were decreased by increasing concentrations of arsenite, while in a culture induced to arsenic resistance the rates were not as adversely effected. Sulfur oxidation was also inhibited to the same extent as tetrathionate oxidation, with the oxidation of solid sulfur being slightly more effected than the oxidation of sulfur dissolved in acetone. Thus, bactericidal arsenite causes a transient formation of extracellular sulfur in the culture supernatant of T. caldus yet the toxicity of arsenite is not due to direct inhibitory effects on reduced inorganic sulfur compound oxidation by these bacteria.

Place, publisher, year, edition, pages
1996. Vol. 145, no 3, p. 409-414
Keywords [en]
Thiobacillus caldus, moderate thermophile, acidophile, arsenic, toxicity, sulfur metabolism, arsenopyrite, ferrooxidans, tolerance
National Category
Microbiology
Research subject
Natural Science, Microbiology
Identifiers
URN: urn:nbn:se:lnu:diva-37317ISI: A1996VZ11000016OAI: oai:DiVA.org:lnu-37317DiVA, id: diva2:750343
Available from: 2014-09-29 Created: 2014-09-29 Last updated: 2017-12-05Bibliographically approved

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Dopson, Mark

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