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Adaptative responses of E-coli to marine environmental stresses. a modelling approach based on viability and dormancy concepts ArchiMer
Martin, Y; Troussellier, Marc; Bonnefont, Jl.
In an attempt to synthesize conceptual and experimental information on the behaviour of enteric bacteria in seawater, a mathematical model has been developed. This model is based on changes in intracellular metabolisable components depending an physiological responses of the cell when subjected to nutrient starvation, salinity stress and solar radiation. Following a strategy which takes into account short- and mid-term physiological adaptation and reversal processes, the cells can develop in different states: culturable (B-1), viable and definitively nonculturable (B-2), and reversibly dormant (B-3) cells. Model parameters were deduced either from original microcosm experiments, from literature data or calibration procedures. Validation of the model was...
Tipo: Text Palavras-chave: Escherichia coli; Eau de mer; Stress; États cellulaires; Modélisation; Escherichia coli; Seawater; Stress; Cellular states; Modelling.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43646/43224.pdf
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Towards a mathematical model of cellular behaviour of enteric bacteria as affected by marine conditions ArchiMer
Martin, Y.; Bonnefont, Jl; Trousselier, M..
A model of E. coli's responses to marine environmental conditions and resulting cell behaviour has previously been developed. The model considers two kinds of antistress physiological responses and three induced cellular categories with different properties (culturable cells B1, viable but definitively non-culturable cells B2, resuscitable dormant cells B3). Since previous simulations have shown a good correlation with experimental data, we analyse here the effects of some environmental parameters (organic matter, salinity, sunlight) on cellular category dynamics in sea water. Results show that sunlight is the most important factor affecting that dynamics. With the use of two E. coli inocula (log or stationnary phase cells), sanitary implications of the...
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Ano: 1996 URL: http://archimer.ifremer.fr/doc/00132/24328/22327.pdf
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