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Quantification of Bacillus Species in a Wastewater Treatment System by the Molecular Analyses
Kazuhiro Takamizawa,Koji Mori,Ryozo Iriye,Mutsunori Hirata 한국생물공학회 2004 Biotechnology and Bioprocess Engineering Vol.9 No.6
Bacillus species were observed and quantified by molecular approaches, using the 16S rDNA primers/probes, in a wastewater treatment plant designed for the purpose of stimulating the growth of Bacillus species. The plant has been operating as a test plant since 1997 in the city of Ina, Japan, with excellent treatment performance. Observations by in situ hybridization, using Bacillus-specific probes, indicated that Bacillus strains were inhabited in the plant and their numbers decreased during the treatment process. Similar results were obtained from a quantitative PCR analysis using a Bacillus-specific primer set, and the amount of DNA originating from various Bacillus species was maximally 1.91% of the total DNA in the wastewater treatment tank. Clone library analysis using the Bacillus-specific primers suggested that, while the population was noticeably increased, the phylogenetic diversity of the increasing Bacillus species was very low.