FEMS Microbiol Lett. 1989 Nov;53(1-2):65-9.

Ammonia-induced injury in pure cultures and natural populations of coliform bacteria.

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Department of Biology, University of Mississippi, University 38677.

Abstract

Ammonia-induced injury was investigated in pure cultures of Escherichia coli and Enterobacter aerogenes, and in natural coliform populations obtained from the oligotrophic Luxapallila and the eutrophic Sunflower Rivers in northern Mississippi. Pure cultures were affected by ammonia exposure as indicated by changes in the injury ratio (IR) of CFU on m-T7 agar/CFU on m-Endo agar. Ammonia concentrations between 0 and 20 (mg NH3-N/1) had little or no effect and concentrations between 40 and 80 caused the greatest injury. Natural coliform populations from the oligotrophic river were more prone to ammonia-induced injury than those from the eutrophic river. The results stress the need for the routine use of m-T7 media and the enumeration of injured cells when using the membrane filter procedure to ascertain domestic water quality.

PMID:: 2693200; [PubMed - indexed for MEDLINE]

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