Adaptation of bacterial cultures to non-oxidising water treatment bactericides

Show simple item record Brözel, Volker Siegfried Pietersen, Belinda Cloete, T.E. (Thomas Eugene), 1958- 2008-01-09T06:38:45Z 2008-01-09T06:38:45Z 1993-07
dc.description.abstract Bacterial communities in water-cooling systems treated with bactericides often become resistant to these bactericides. This has been ascribed to selection for resistant cells. Certain bacteria, having a high inherent susceptibility to water treatment bactericides, become dominant in systems after bactericide treatment. We investigated the idea that bacterial isolates adapt to growth in the presence of bactericides. Pure cultures of Pseudomonas stutzeri and Bacillus cereus were cultured repeatedly in the presence of sub-inhibitory concentrations of 2,2’-methylenebis(4-chlorophenol), sodium dimethyldithiocarbamate and isothiazolone. Both isolates adapted to growth in the presence of increasing concentrations of the bactericides. P. stutzeri adapted from 22 µg/ml 2,2’-methylenebis(4-chlorophenol) to 80 µ g/ml, from 12 µg/ml Na dimethyldithiocarbamate to 310 µg/ml, and from 50 µl/l isothiazolone to 250 µl/l. B. cereus adapted from 20 µg/ml 2,2’-methylenebis(4-chlorophenol) to 75 µg/ml, from 6 µg/ml Na dimethyldithiocarbamate to 132 µg/ml, and from 50 µl/l isothiazolone to 300 µl/l. The phenomenon of resistance to water treatment bactericides can be ascribed not only to selection but also to adaptation. en
dc.format.extent 351502 bytes
dc.format.mimetype application/pdf
dc.identifier.citation Brözel, VS, Pietersen, B & Cloete, TE 1993, 'Adaptation of bacterial cultures to non-oxidising water treatment bactericides', Water SA, vol. 19, no, 3, pp. 259-262. [] en
dc.identifier.issn 0378-4738
dc.language.iso en en
dc.publisher Water Research Council en
dc.rights Water Research Council en
dc.subject Water treatment bactericides en
dc.subject Pseudomonas stutzeri en
dc.subject Adaptation en
dc.subject Selection en
dc.subject Industrial water systems en
dc.subject Water-cooling systems
dc.subject Resistance
dc.subject.lcsh Bactericides
dc.subject.lcsh Bacillus cereus
dc.subject.lcsh Pseudomonas
dc.subject.lcsh Industrial water supply
dc.subject.lcsh Bacteriology -- Cultures and culture media
dc.subject.lcsh Sewage -- Purification
dc.title Adaptation of bacterial cultures to non-oxidising water treatment bactericides en
dc.type Article en

Files in this item

This item appears in the following Collection(s)

Show simple item record