Article Abstract:
The inactivation of Sphingomonas cells that are attached to goethite particles in drinking water has been studied. Sphingomonas may occur as single, aggregated or particle-attached bacteria. Treatment plants, biofilm shearing or resuspension of deposits are possible sources of Sphingomonas. A Sphingomonas strain was isolated from the tap water coming from the Nancy distribution system and was grown in nutrient broth. Results reveal that attachment to goethite particles does not offer additional protection to Sphingomonas. Its presence in drinking water is attributed to the limited efficacy of chlorine as a disinfectant.
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Article Abstract:
The water quality from Denver's Direct Potable Reuse Demonstration Plant was evaluated by monitoring the presence of coliphages in the treated water. The results showed that some coliphages could escape the treatment process. Analysis of the contact time (CT) values of coliphage populations in the influent and treated water showed that escaping coliphages had higher CT values. This suggests that monochloramine treatment alone is not sufficient to remove coliphages with high CT values, specifically values exceeding 1,200.
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Article Abstract:
A survey of the bacterial component in the necrotic tissue of three columnar cacti species is discussed. Clusters of nonspecific isolates were constructed by the fatty acids of the bacteria and were identified by traditional taxonomic methods. The resulting bacterial communities among the different cacti, their relationships and their chemistries were compared. Differences in the chemical compositions of the three cactus species is believed to be the cause of the observed bacterial distribution patterns.
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