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- W2071128938 abstract "ABSTRACT New primers were designed for the amplification of dsrAB genes by nested PCR to investigate the diversity of sulfate-reducing prokaryotes (SRP) in environments with low bacterial cell density. The success of the nested PCR for the determination of SRP diversity was estimated by terminal-restriction fragment length polymorphism analysis in the Reigous, a small creek at an inactive mine (Carnoulès, France), which constitutes an extreme acidic arsenic-rich environment. Nested PCR limits were evaluated in dsrAB -rich sediments, and this technique was compared to direct PCR using either known primers (DSR1F/DSR4R) or new primers (dsr619AF/dsr1905BR). The comparison of clone libraries revealed that, even if the levels of diversity observed were not identical, nested PCR did not reduce the diversity compared to that of direct DSR1F/DSR4R PCR. Clone sequences were affiliated mainly with the Desulfobacteraceae and Desulfohalobiaceae families. Many sequences (∼30%) were related to a deeply branching lineage unaffiliated with any cultured SRP. Although this dsrAB cluster was found in all libraries, the new primers better amplified this lineage, providing more information on this unknown bacterial group. Thanks to these new primers in nested PCR, the SRP community from Carnoulès could be characterized. Specific SRP populations were obtained according to environmental characteristics. Desulfomicrobiaceae -related sequences were recovered in samples with low pH, low levels of dissolved oxygen, and high As content, while sequences belonging to the deeply branching group were found in a less extreme sample. Furthermore, for the first time, dsrAB sequences related to the latter group were recovered from freshwater." @default.
- W2071128938 created "2016-06-24" @default.
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- W2071128938 date "2010-05-01" @default.
- W2071128938 modified "2023-10-16" @default.
- W2071128938 title "Nested PCR and New Primers for Analysis of Sulfate-Reducing Bacteria in Low-Cell-Biomass Environments" @default.
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- W2071128938 doi "https://doi.org/10.1128/aem.02023-09" @default.
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