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- W2098720265 abstract "ABSTRACT Microbial communities growing in laboratory-based flow chambers were investigated in order to study compartmentalization of specific gene expression. Among the community members studied, the focus was in particular on Pseudomonas putida and a strain of an Acinetobacter sp., and the genes studied are involved in the biodegradation of toluene and related aromatic compounds. The upper-pathway promoter ( Pu ) and the meta -pathway promoter ( Pm ) from the TOL plasmid were fused independently to the gene coding for the green fluorescent protein (GFP), and expression from these promoters was studied in P. putida , which was a dominant community member. Biofilms were cultured in flow chambers, which in combination with scanning confocal laser microscopy allowed direct monitoring of promoter activity with single-cell spatial resolution. Expression from the Pu promoter was homogeneously induced by benzyl alcohol in both community and pure-culture biofilms, while the Pm promoter was induced in the mixed community but not in a pure-culture biofilm. By sequentially adding community members, induction of Pm was shown to be a consequence of direct metabolic interactions between an Acinetobacter species and P. putida . Furthermore, in fixed biofilm samples organism identity was determined and gene expression was visualized at the same time by combining GFP expression with in situ hybridization with fluorescence-labeled 16S rRNA targeting probes. This combination of techniques is a powerful approach for investigating structure-function relationships in microbial communities." @default.
- W2098720265 created "2016-06-24" @default.
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- W2098720265 date "1998-02-01" @default.
- W2098720265 modified "2023-10-17" @default.
- W2098720265 title "In Situ Gene Expression in Mixed-Culture Biofilms: Evidence of Metabolic Interactions between Community Members" @default.
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- W2098720265 doi "https://doi.org/10.1128/aem.64.2.721-732.1998" @default.
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