Use of combined microautoradiography and fluorescence in situ hybridization to determine carbon metabolism in mixed natural communities of uncultured bacteria from the genus Achromatium |
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Authors: | Gray N D Howarth R Pickup R W Jones J G Head I M |
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Institution: | Fossil Fuels and Environmental Geochemistry Postgraduate Institute and Centre for Molecular Ecology, University of Newcastle, Newcastle upon Tyne NE1 7RU, United Kingdom. |
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Abstract: | Combined microautoradiography and fluorescence in situ hybridization (FISH) was used to investigate carbon metabolism in uncultured bacteria from the genus Achromatium. All of the Achromatium species identified in a freshwater sediment from Rydal Water, Cumbria, United Kingdom, which were distinguishable only by FISH, assimilated both (14)C]bicarbonate and (14)C]acetate. This extends previous findings that Achromatium spp. present at another location could only utilize organic carbon sources. Achromatium spp., therefore, probably exhibit a range of physiologies, i.e., facultative chemolithoautotrophy, mixotrophy, and chemoorganoheterotrophy, similar to other large sulfur bacteria (e.g., Beggiatoa spp.). |
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