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Int J Syst Evol Microbiol 55 (2005), 821-829; DOI  10.1099/ijs.0.63337-0
© 2005 International Union of Microbiological Societies

Adhaeribacter aquaticus gen. nov., sp. nov., a Gram-negative isolate from a potable water biofilm

A. H. Rickard1, A. T. Stead2, G. A. O'May3, S. Lindsay1, M. Banner2, P. S. Handley2 and P. Gilbert1

1 School of Pharmacy, University of Manchester, Manchester M13 9PL, UK
2 School of Biological Sciences, University of Manchester, Manchester M13 9PL, UK
3 Molecular and Cellular Pathology, University of Dundee, Dundee DD1 7SY, UK

Correspondence
P. Gilbert
Peter.Gilbert{at}man.ac.uk

A Gram-negative bacterium was isolated from a freshwater biofilm developed on a stainless steel surface under a fluid velocity of 0·26 m s–1. The strain, MBRG1.5T, was cultivated on R2A agar and formed pink colonies. Light microscopy and negative staining in a transmission electron microscope showed that the cells were rod-shaped, approximately 2·8–4·1 µm long by 0·9–1·7 µm wide in size and produced large quantities of extracellular fibrillar material. Additionally, following growth in batch culture, transmission electron microscopy showed that many cells plasmolysed. Stationary-phase cells were more variable in size and shape. The DNA G+C content was 40·0 mol%. The most abundant fatty acids were 15 : 0 iso (22·5 %), followed by 16 : 1{omega}5c (16·9 %) and 15 : 0 iso 2-OH (16·5 %). Phylogenetic analysis of the 16S rRNA gene showed that the strain was a member of the family ‘Flexibacteraceae’ of the Cytophaga–Flavobacterium–Bacteroides group. Phenotypic and genotypic analyses indicated that the strain could not be assigned to any recognized genus; therefore a novel genus and species, Adhaeribacter aquaticus gen. nov., sp. nov., is proposed, with MBRG1.5T (=DSM 16391T=NCIMB 14008T) as the type strain.

Abbreviations: CFA, cellular fatty acid; CFB, Cytophaga–Flavobacterium–Bacteroides

Published online ahead of print on 29 October 2004 as DOI 10.1099/ijs.0.63337-0.

The GenBank/EMBL/DDBJ accession number for the 16S rRNA gene sequence of strain MBRG1.5T is AJ626894.




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