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Structured model for denitrifier diauxic growth

✍ Scribed by Ryan Hamilton; Anna Casasús; Madeline Rasche; Atul Narang; Spyros A. Svoronos; Ben Koopman

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
332 KB
Volume
90
Category
Article
ISSN
0006-3592

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✦ Synopsis

We present a model for diauxic growth of denitrifying bacteria in which nitrate reductase synthesis kinetics dominate the overall growth kinetics. The model is based on the assumption of the existence of a nitrate respiration operon, thereby linking the rate of nitrate uptake to the activity of nitrate reductase. We show that this approach can model diauxic growth of Pseudomonas denitrificans by conducting experiments in which nitrate reductase activity was measured during both lag and ensuing exponential growth phases. We consistently observed the pattern of low nitrate reductase enzyme activity during the lag phase, increasing before the onset of growth. By fitting model parameters we were able to successfully match experimental data for growth, nitrate uptake, and enzyme activity level.

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