PMID: 11934022Apr 6, 2002Paper

Growth pH does not affect the initial physiological state parameter (pO) of Listeria monocytogenes

International Journal of Food Microbiology
Robin C McKellarK P Knight

Abstract

It has proven difficult to develop adequate mathematical models for the lag phase (lambda) which characterizes the adaptation period prior to the initiation of exponential growth by microorganisms. This is due, in part, to our incomplete understanding of the nature of the initial physiological state of cells (defined as h0 or p0 depending on the model), and changes taking place during adaptation. The objectives of the present study were to characterize p0 using data from growth of Listeria monocytogenes in an automated turbidimetric instrument (Bioscreen), and to determine the influence of limiting growth pH. A model was developed for individual cells which combined a continuous adaptation phase (defined by p0) with a discrete step marking the transition to a continuous exponential growth phase (the CDC model). Parameters of the new model were: p0; the specific growth rate (mu); the initial cell number (N0); and the maximum cell density (Nmax). Progressive reduction of the growth pH in the Bioscreen to 4.7 decreased the p. It was noted that the regression lines for all trials at all pH values appeared to have a common x-intercept (20.086+/-1.092), and it was deduced that, when the Bioscreen detection limit (15.07 In cfu well(-1...Continue Reading

References

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Apr 25, 2000·International Journal of Food Microbiology·R C McKellar, K Knight
Jun 17, 2000·International Journal of Food Microbiology·J C Augustin, V Carlier
Apr 6, 2002·International Journal of Food Microbiology·R C McKellarK P Knight

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Citations

Apr 6, 2002·International Journal of Food Microbiology·R C McKellarK P Knight
Dec 3, 2004·Applied and Environmental Microbiology·Dirk MargoschRudi F Vogel
Apr 18, 2013·International Journal of Food Microbiology·Juan S AguirreGonzalo D García de Fernando
Oct 26, 2005·International Journal of Food Microbiology·Robin C McKellar, Aileen Hawke
Jan 28, 2012·International Journal of Food Microbiology·I MytilinaiosR J W Lambert
Apr 28, 2005·International Journal of Food Microbiology·Louis CorollerDominique Thuault

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