Abstract
ABSTRACTIn the present article the distribution and abundance of ammonia‐assimilating microbes among the natural habitants in a lagoon were investigated. In the medium containing lagoon‐extract, about 20% of total 82 isolates showed ammonia‐assimilating ability. By sequencing of 16S ribosomal DNA (rDNA), the highest ammonia‐assimilating isolates at 10°C and 37°C were identified as Janthinobacterium lividum and Bacillus sp., respectively. The structure of the microbial community was analyzed by polymerase chain reaction‐denaturing gradient gel electrophoresis (PCR‐DGGE). Almost of the dominant species that were detected by PCR‐DGGE did not coincide with isolates, which showed the high ammonia‐assimilating ability, but one specie by PCR‐DGGE coincided with ammonia‐assimilating isolate. These results suggested that ammonia‐assimilating microbes existed as non‐dominant species in the microbial community in a lagoon.
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