Physiological studies of chloramine resistance developed by Klebsiella pneumoniae under low-nutrient growth conditions
Article Abstract:
Growth of a Klebsiella pneumoniae strain under conditions similar to those in the potable water environment results in increased resistance to chloramines. An investigation was conducted to determine the physiological components responsible for this increased resistance. The results showed that growth under low-nutrient conditions could induce increases in aggregation potential and capsule production, change the composition of membrane lipids and decrease the oxidation of sulfhydryl groups. These physiological changes result in an increased resistance to chloramines.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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Colonization and disinfection of biofilms hosting coliform-colonized carbon fines
Article Abstract:
The carbon fines (CF) carrying Klebsiella pneumoniae transfer the bacteria to heterotrophic biofilms, promoting the successful colonization of the coliform in the biofilm. Both K. pneumoniae and CF are detached and disinfected faster than the total population following chlorination. A limited population of coliforms and CFs resist chlorination and persist in the biofilm. Coliforms and other organisms that survive biological treatment act as inocula for the drinking water distribution system and attachment to CFs plays a role in the effectiveness of this process.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1996
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Impact of growth conditions on resistance of Klebsiella pneumoniae to chloramines
Article Abstract:
The effect of various growth conditions on the development of resistance to chloramines by Klebsiella pneumonia was evaluated. Growth phase did not affect resistance and growth temperature was seen to have only a moderate effect. Growth in low-nutrient conditions stimulated bacterial resistance. This suggests that physiologic alterations in the cell had been triggered by such a stress, leading to disinfectant resistance. Other factors which might be of importance are growth environment and physical protection by formation of cell aggregates.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1992
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