Chlorine inactivation of Sphingomonas cells attached to goethite particles in drinking water

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.

Evaluation, Physiological aspects, Bacteria, Drinking water, Contamination, Microbial contamination, Chlorination

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Identification and ecology of bacterial communities associated with necrosesof three cactus species

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.

Analysis, Bacterial diseases of plants, Bacterial plant diseases, Cactus, Cacti, Necrosis

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