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Habituation of Sulfobacillus thermosulfidooxidans to 4-nonylphenol in ferrous ion growth medium

Paper ID Volume ID Publish Year Pages File Format Full-Text
35362 45088 2011 8 PDF Available
Title
Habituation of Sulfobacillus thermosulfidooxidans to 4-nonylphenol in ferrous ion growth medium
Abstract

The aim of this study was to resolve the apparent inconsistency between the prevalence of the moderate thermophile Sulfobacillus thermosulfidooxidans in copper sulfide heaps and the sensitivity of this bacterium to the solvent extraction (SX) reagent used to concentrate and purify the copper in solution prior to metal production. More than 1 year was required to achieve habituation to the most inhibitory component of the SX reagent, 4-nonylphenol (4-NP; 2 mg L−1), when S. thermosulfidooxidans was grown in ferrous ion medium. However, habituation to 4-NP did not confer the ability to tolerate higher 4-NP concentrations and those characteristics acquired by the cells during habituation were rapidly lost when grown for a short period in 4-NP-free medium. The culture habituated to the presence of 2 mg L−1 4-NP exhibited differences in cell morphology, cell ultrastructure and membrane fatty acid composition compared with the untreated culture subjected to a similar subculture regime. It is concluded that, where S. thermosulfidooxidans is prevalent in copper sulfide heaps associated with SX-EW plants, this species has become habituated through continuous long-term exposure to low concentrations of 4-NP derived from entrained SX reagent in the recycled leach solutions.

Keywords
4-Nonylphenol; Acidophilic bacteria; Ferrous ion oxidation; Adaptation
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Habituation of Sulfobacillus thermosulfidooxidans to 4-nonylphenol in ferrous ion growth medium
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 46, Issue 1, January 2011, Pages 108–115
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us