title: Monitoring of Ralstonia eutropha KT1 in groundwater in an experimental bioaugmentation field by in situ PCR.
abstract: Ralstonia eutropha KT1, which degrades trichloroethylene, was injected into the aquifer after activation with toluene, and then the number of bacteria was monitored by in situ PCR targeting the phenol hydroxylase gene and by fluorescent in situ hybridization (FISH) targeting 16S rRNA. Before injection of the bacterial suspension, the total concentration of bacteria in the groundwater was approximately 3 x 10(5) cells/ml and the amount of Ralstonia and bacteria carrying the phenol hydroxylase gene as a percentage of total bacterial cells was less than 0.1%. The concentration of bacteria carrying the phenol hydroxylase gene detected by in situ PCR was approximately 3 x 10(7) cells/ml 1 h after injection, and the concentration of Ralstonia detected by FISH was similar. The number of bacteria detected by in situ PCR was similar to that detected by FISH 4 days after the start of the extraction of groundwater. On and after day 7, however, the number of bacterial cells detected by FISH was less than that detected by in situ PCR.
authors.affiliation: Environmental Science and Microbiology, Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan.
authors.forename: Katsuji
authors.initials: K
authors.lastname: Tani
authors.forename: Masahiro
authors.initials: M
authors.lastname: Muneta
authors.forename: Kanji
authors.initials: K
authors.lastname: Nakamura
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Shibuya
authors.forename: Masao
authors.initials: M
authors.lastname: Nasu
mesh_terms: D001673:Biodegradation, Environmental; D020118:Cupriavidus necator / Q000201:enzymology / Q000235:genetics / Q000302:isolation & purification*; D004275:DNA, Ribosomal / Q000032:analysis; D005618:Fresh Water / Q000382:microbiology*; D017404:In Situ Hybridization, Fluorescence; D006899:Mixed Function Oxygenases / Q000235:genetics / Q000378:metabolism; D016133:Polymerase Chain Reaction / Q000379:methods*; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D014241:Trichloroethylene / Q000378:metabolism*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S; D014874:Water Pollutants, Chemical; D014241:Trichloroethylene; D006899:Mixed Function Oxygenases; C022336:phenol 2-monooxygenase