title: Immobilization as a technical possibility for long-term storage of bacterial biosensors.
abstract: For applications in field experiments, the recombinant strain Salmonella typhimurium TA1535 was immobilized to permit its immediate utilization after long storage periods. Salmonella typhimurium TA1535 cells contain the plasmid that has an inducible SOS promoter fused to a promoterless luxCDABFE operon from Photobacterium leiognathi. The induction of bioluminescence occurs in the presence of the DNA-damaging agent mitomycin C which stimulates the bacterial SOS response. Early stationary phase cells were immobilized at a cell concentration of 10(10) CFU/ml in microtiter plates and stored up to 6 weeks at 4 degrees C in a sealed container. Even after 4 weeks of storage, the bioluminescence kinetics and yield in response to different concentrations of mitomycin C were not significantly different from those of freshly prepared samples.
authors.affiliation: National Research Laboratory on Environmental Biotechnology, Gwangju Institute of Science and Technology, Buk-gu, Gwangju 500-712, Republic of Korea.
authors.forename: Kyeong Seo
authors.initials: KS
authors.lastname: Park
authors.forename: Christa
authors.initials: C
authors.lastname: Baumstark-Khan
authors.forename: Petra
authors.initials: P
authors.lastname: Rettberg
authors.forename: Gerda
authors.initials: G
authors.lastname: Horneck
authors.forename: Elke
authors.initials: E
authors.lastname: Rabbow
authors.forename: Man Bock
authors.initials: MB
authors.lastname: Gu
mesh_terms: D015374:Biosensing Techniques; D004249:DNA Damage; D004784:Environmental Monitoring / Q000379:methods*; D008163:Luminescent Measurements; D016685:Mitomycin / Q000633:toxicity; D009152:Mutagenicity Tests / Q000379:methods*; D009153:Mutagens / Q000633:toxicity; D013014:SOS Response, Genetics / Q000235:genetics; D012486:Salmonella typhimurium / Q000187:drug effects* / Q000235:genetics; D013997:Time Factors
chemical_list: D009153:Mutagens; D016685:Mitomycin