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- W2019233054 abstract "Biopolymers are important substrates for heterotrophic bacteria in (ultra)oligotrophic freshwater environments, but information about their utilization at microgram-per-liter levels by attached freshwater bacteria is lacking. This study aimed at characterizing biopolymer utilization in drinking-water-related biofilms by exposing such biofilms to added carbohydrates or proteins at 10 μg C liter(-1) in flowing tap water for up to 3 months. Individually added amylopectin was not utilized by the biofilms, whereas laminarin, gelatin, and caseinate were. Amylopectin was utilized during steady-state biofilm growth with simultaneously added maltose but not with simultaneously added acetate. Biofilm formation rates (BFR) at 10 μg C liter(-1) per substrate were ranked as follows, from lowest to highest: blank or amylopectin (≤6 pg ATP cm(-2) day(-1)), gelatin or caseinate, laminarin, maltose, acetate alone or acetate plus amylopectin, and maltose plus amylopectin (980 pg ATP cm(-2) day(-1)). Terminal restriction fragment length polymorphism (T-RFLP) and 16S rRNA gene sequence analyses revealed that the predominant maltose-utilizing bacteria also dominated subsequent amylopectin utilization, indicating catabolic repression and (extracellular) enzyme induction. The accelerated BFR with amylopectin in the presence of maltose probably resulted from efficient amylopectin binding to and hydrolysis by inductive enzymes attached to the bacterial cells. Cytophagia, Flavobacteriia, Gammaproteobacteria, and Sphingobacteriia grew during polysaccharide addition, and Alpha-, Beta-, and Gammaproteobacteria, Cytophagia, Flavobacteriia, and Sphingobacteriia grew during protein addition. The succession of bacterial populations in the biofilms coincided with the decrease in the specific growth rate during biofilm formation. Biopolymers can clearly promote biofilm formation at microgram-per-liter levels in drinking water distribution systems and, depending on their concentrations, might impair the biological stability of distributed drinking water." @default.
- W2019233054 created "2016-06-24" @default.
- W2019233054 creator A5025029074 @default.
- W2019233054 creator A5031289455 @default.
- W2019233054 creator A5034328152 @default.
- W2019233054 date "2014-04-15" @default.
- W2019233054 modified "2023-10-16" @default.
- W2019233054 title "Polysaccharides and Proteins Added to Flowing Drinking Water at Microgram-per-Liter Levels Promote the Formation of Biofilms Predominated by Bacteroidetes and Proteobacteria" @default.
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- W2019233054 doi "https://doi.org/10.1128/aem.04105-13" @default.
- W2019233054 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3993164" @default.
- W2019233054 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24487544" @default.
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