| changes in the community structure and activity of betaproteobacterial ammonia-oxidizing sediment bacteria along a freshwater-marine gradient. | to determine whether the distribution of estuarine ammonia-oxidizing bacteria (aob) was influenced by salinity, the community structure of betaproteobacterial ammonia oxidizers (aob) was characterized along a salinity gradient in sediments of the ythan estuary, on the east coast of scotland, uk, by denaturant gradient gel electrophoresis (dgge), cloning and sequencing of 16s rrna gene fragments. ammonia-oxidizing bacteria communities at sampling sites with strongest marine influence were dominat ... | 2006 | 16584480 |