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Dispelling the "Nocardia amarae" myth: a phylogenetic and phenotypic study of mycolic acid-containing actinomycetes isolated from activated sludge foam

Lookup NU author(s): Dr Fiona Stainsby, Jeannie Upton, Professor Michael Goodfellow


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Right-angle branched filaments and rods micromanipulated from activated sludge foam and mixed liquor were identified as putatively novel members of the genera Gordonia, Mycobacterium and Rhodococcus using a combination of chemical, molecular and morphological data. Pyrolysis mass spectrometric analyses of gordoniae isolated in both the present and a previous study revealed gyro-groups, distinct from validly described Gordonia species, which could be equated with those based on morphological properties and 16S rDNA data. Putative gordoniae assigned to one of these groups were found to be closely related to strains currently identified as "Rhodococcus australis". These strains were also found to have properties consistent with their classification in the genus Gordonia. The results of this study highlight the limitations of the microscopic approach to filament identification and cast further doubt on the view that foaming can be attributed to members of one or a few Nocardia species.

Publication metadata

Author(s): Goodfellow M; Stainsby FM; Upton J; Soddell J; Seviour R

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Water Science and Technology: 3rd IWA International Specialised Conference on Microorganisms in Activated Sludge and Biofilm Processes

Year of Conference: 2002

Pages: 81-90

ISSN: 0273-1223

Publisher: IWA Publishing

Library holdings: Search Newcastle University Library for this item

ISBN: 19969732