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Publication type: Journal Article
Document type: Full Paper

Year: 2007

Author(s): Pribil, W; Gehringer, P; Eschweiler, H; Cabaj, A; Haider, T; Sommer, R

Title: Assessment of Bacillus subtilis spores as a possible bioindicator for evaluation of the microbicidal efficacy of radiation processing of water.

Source: Water Environ Res. 2007; 79(7):720-724

Authors Vetmeduni Vienna:

Cabaj Alexander

Vetmed Research Units
Institute of Physiology, Pathohysiology and Biophysics, Unit of Physiology and Biophysics

Project(s): UV-Disinfection of water

Gamma and electron-beam irradiation of Bacillus subtilis spores suspended in different types of water was studied to evaluate the inactivation of the spores and assess their possible use as a bioindicator for radiation processing. We found that the inactivation proceeded endogenously, being dose-rate-dependent and affected by oxygen. The radiation resistance of the suspended spores was found to be rather high; therefore, B. subtilis spores used as a bioindicator for efficiency of water treatment by radiation under practical conditions might result in the spores being overly conservative surrogates for pathogenic microorganisms. Moreover, the doserate dependency impedes the use of the spores as a bioindicator. Thus, B. subtilis spores cannot be recommended as a bioindicator for evaluation of the microbicidal efficacy of ionizing radiation processing of water.

Keywords Pubmed: Bacillus subtilis/isolation & purification
Bacillus subtilis/radiation effects*
Colony Count, Microbial
Dose-Response Relationship, Radiation
Environmental Monitoring/methods
Hydrogen Peroxide/pharmacology
Radiation, Ionizing*
Spores, Bacterial/isolation & purification
Spores, Bacterial/radiation effects
Water Pollutants/isolation & purification
Water Pollutants/radiation effects*
Water Purification/methods*

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