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- W2025909766 abstract "RNA based stable isotope probing (SIP) facilitates the detection and identification of active members of microbial populations that are involved in the assimilation of an isotopically labeled compound. (15)N-RNA-SIP is a new method that has been discussed in recent literature but has not yet been tested. Herein, we define the limitations to using (15)N-labeled substrates for SIP and propose modifications to compensate for some of these shortcomings. We have used (15)N-RNA-SIP as a tool for analysing mixed bacterial populations that use nitrogen substrates. After incubating mixed microbial communities with (15)N-ammonium chloride or (15)N(2) we assessed the fractionation resolution of (15)N-RNA by isopycnic centrifugation in caesium trifluoroacetate (CsTFA) gradients. We found that the more isotopic label incorporated, the further the buoyant density (BD) separation between (15)N- and (14)N-RNA, however it was not possible to resolve the labeled from unlabeled RNA definitively through gradient fractionation. Terminal-restriction fragment length polymorphism (T-RFLP) analysis of the extracted RNA and fluorescent in situ hybridisation (FISH) analysis of the enrichment cultures provided some insight into the organisms involved in nitrogen fixation. This approach is not without its limitations and will require further developments to assess its applicability to other nitrogen-fixing environments." @default.
- W2025909766 created "2016-06-24" @default.
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- W2025909766 date "2010-01-01" @default.
- W2025909766 modified "2023-10-18" @default.
- W2025909766 title "Stable isotope probing: Technical considerations when resolving 15N-labeled RNA in gradients" @default.
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- W2025909766 doi "https://doi.org/10.1016/j.mimet.2009.11.002" @default.
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