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. 1992 Aug;58(8):2386–2392. doi: 10.1128/aem.58.8.2386-2392.1992

Effect of Starvation on Induction of Quinoline Degradation for a Subsurface Bacterium in a Continuous-Flow Column

Michael J Truex 1,*, Fred J Brockman 1, Donald L Johnstone 1, James K Fredrickson 1
PMCID: PMC195791  PMID: 16348744

Abstract

Differences in the induction response and the initial two reactions of quinoline degradation between short-term (2 days)- and long-term (60 to 80 days)-starved cells of a subsurface Pseudomonas cepacia strain were examined by using continuous-flow columns. The ability of bacteria that are indigenous to oligotrophic environments to respond to a contaminant was assessed by using long-term starvation to induce a cell physiology that simulates the in situ physiology of the bacteria. With quinoline concentrations of 39 and 155 μM, long-term-starved cells converted quinoline to degradation products more efficiently than did short-term-starved cells. Quinoline concentrations of 155 μM and, to a greater extent, 775 μM had an inhibitory effect on induction in long-term-starved cells. However, only the length of the induction process was affected with these quinoline concentrations; degradation of quinoline at the steady state for long-term-starved cells was equal to or better than that for short-term-starved cells. The induction time for short-term-starved cells did not increase progressively with increasing quinoline concentration. Experiments with starved cells are important for the development of accurate predictive models of contaminant transport in the subsurface because starvation, which induces a cell physiology that simulates the in situ physiology of many bacteria, may affect the induction process.

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Selected References

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