Physiological response of Enterococcus faecalis JH2-2 to cold shock: growth at low temperatures and freezing/thawing challenge.

Bouachanh Thammavongs; D Corroler; Jean-Michel Panoff; Yanick Auffray; Philippe Boutibonnes

Physiological response of Enterococcus faecalis JH2-2 to cold shock: growth at low temperatures and freezing/thawing challenge.

Bouachanh Thammavongs D Corroler ¹ Jean-Michel Panoff ¹ Yanick Auffray ² Philippe Boutibonnes ¹

1 ABTE - Aliments Bioprocédés Toxicologie Environnements

2 LME - Laboratoire de Microbiologie de l’Environnement

Abstract : Growth at low positive temperatures and induced phenotypic resistance to extreme cold temperature (freezing/thawing cycles) of Enterococcus faecalis were investigated. The effect of low temperatures on the specific growth rates was studied; use of Arrhenius profile and Ratkovsky 'square-root' model allowed determination of the 'temperature characteristic' (mu approximately equal to 13,800 cal mol-1), the critical temperature (Tcrit approximately equal to 17.9 degrees C) and the notional minimum growth temperature (T0 approximately equal to 3.6 degrees C). Preincubation of Ent. faecalis cells at low temperatures (8-16 degrees C) during periods corresponding to their generation time resulted in an increased ability of the bacterial cells to withstand short periods of freezing/thawing (-20 degrees C/+37 degrees C) challenge. Moreover, the increase of the incubation period at low positive temperature led to a higher degree of adaptation.

Type de document :

Article dans une revue

Domaine :

Sciences du Vivant [q-bio] / Microbiologie et Parasitologie

Sciences du Vivant [q-bio] / Microbiologie et Parasitologie / Bactériologie

Liste complète des métadonnées

https://hal-normandie-univ.archives-ouvertes.fr/hal-02148062
Contributeur : David Corroler <>
Soumis le : mercredi 5 juin 2019 - 11:33:19
Dernière modification le : jeudi 18 juillet 2019 - 09:46:14

Physiological response of Enterococcus faecalis JH2-2 to cold shock: growth at low temperatures and freezing/thawing challenge.

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Physiological response of Enterococcus faecalis JH2-2 to cold shock: growth at low temperatures and freezing/thawing challenge.

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