Bacterial populations in samples of bioleached copper ore as revealed by analysis of DNA obtained before and after cultivation
Article Abstract:
An analysis of the bacterial populations in bioleaching systems by analysis of DNA from ores, leaching systems, or laboratory cultures indicates the predominance of different bacteria depending on the growth conditions. PCR amplification and characterization of the spacer regions between the 16 and 23S genes in the rRNA genetic loci indicates that Thiobacillus ferrooxidans predominates at high ferrous iron concentrations. T. thiooxidans and Leptospirillum ferrooxidans predominate at low ferrous iron levels.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1996
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Bacterial community in copper sulfide ores inoculated and leached with solution from a commercial-scale copper leaching plant
Article Abstract:
The bacterial population in ores leached with the high-sulfate solution used in copper bioleaching plants was studied. The complexity of the original population was established by the length pattern of the spacer regions between the 16S and 23S rRNA genes, observed after PCR amplification of the DNA extracted from the leached ore. Findings showed that the bacteria in the leached ore formed a population made of at least three species: Thiobacillus thiooxidans, T. ferrooxidans and Leptospirillum ferrooxidans.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1997
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Chemolithotrophic bacteria in copper ores leached at high sulfuric acid concentration
Article Abstract:
Chemolithotrophic bacterial strains, closely related to Thiobacillus thiooxidans and Leptospirillum ferrooxidans develop during leaching of copper sulfide ores at high sulfuric acid concentration. Bacterial enhancement of ferrous iron and sulfide oxidation occurs to a significant extent during leaching with 0.6 N sulfuric acid. Iron oxidation is attributable to L. ferrooxidans, instead of T. ferrooxidans.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1997
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