PMID- 16478447 OWN - NLM STAT- MEDLINE DCOM- 20060627 LR - 20131121 IS - 1462-2912 (Print) IS - 1462-2912 (Linking) VI - 8 IP - 3 DP - 2006 Mar TI - Selective enrichment and molecular characterization of a previously uncultured Nitrospira-like bacterium from activated sludge. PG - 405-15 AB - Previously uncultured nitrite-oxidizing bacteria affiliated to the genus Nitrospira have for the first time been successfully enriched from activated sludge from a municipal wastewater treatment plant. During the enrichment procedure, the abundance of the Nitrospira-like bacteria increased to approximately 86% of the total bacterial population. This high degree of purification was achieved by a novel enrichment protocol, which exploits physiological features of Nitrospira-like bacteria and includes the selective repression of coexisting Nitrobacter cells and heterotrophic contaminants by application of ampicillin in a final concentration of 50 microg ml(-1). The enrichment process was monitored by electron microscopy, fluorescence in situ hybridization (FISH) with rRNA-targeted probes and fatty acid profiling. Phylogenetic analysis of 16S rRNA gene sequences revealed that the enriched bacteria represent a novel Nitrospira species closely related to uncultured Nitrospira-like bacteria previously found in wastewater treatment plants and nitrifying bioreactors. The enriched strain is provisionally classified as 'Candidatus Nitrospira defluvii'. FAU - Spieck, Eva AU - Spieck E AD - Universitat Hamburg, Biozentrum Klein Flottbek, Mikrobiologie, Ohnhorststr. 18, D-22609 Hamburg, Germany. spieck@mikrobiologie.uni-hamburg.de FAU - Hartwig, Christine AU - Hartwig C FAU - McCormack, Iris AU - McCormack I FAU - Maixner, Frank AU - Maixner F FAU - Wagner, Michael AU - Wagner M FAU - Lipski, Andre AU - Lipski A FAU - Daims, Holger AU - Daims H LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - England TA - Environ Microbiol JT - Environmental microbiology JID - 100883692 RN - 0 (Anti-Bacterial Agents) RN - 0 (DNA, Bacterial) RN - 0 (DNA, Ribosomal) RN - 0 (Fatty Acids) RN - 0 (RNA, Bacterial) RN - 0 (RNA, Ribosomal, 16S) RN - 0 (Sewage) RN - 7C782967RD (Ampicillin) SB - IM MH - Ampicillin/pharmacology MH - Anti-Bacterial Agents/pharmacology MH - Bacteria/classification/*genetics/*isolation & purification MH - Bacterial Physiological Phenomena MH - DNA, Bacterial/chemistry/genetics MH - DNA, Ribosomal/chemistry/genetics MH - Fatty Acids/analysis/chemistry MH - Genes, rRNA MH - In Situ Hybridization, Fluorescence MH - Microscopy, Electron MH - Nitrobacter/drug effects MH - RNA, Bacterial/analysis MH - RNA, Ribosomal, 16S/genetics MH - Sequence Analysis, DNA MH - Sewage/*microbiology MH - Water Microbiology EDAT- 2006/02/16 09:00 MHDA- 2006/06/28 09:00 CRDT- 2006/02/16 09:00 PHST- 2006/02/16 09:00 [pubmed] PHST- 2006/06/28 09:00 [medline] PHST- 2006/02/16 09:00 [entrez] AID - EMI905 [pii] AID - 10.1111/j.1462-2920.2005.00905.x [doi] PST - ppublish SO - Environ Microbiol. 2006 Mar;8(3):405-15. doi: 10.1111/j.1462-2920.2005.00905.x.