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Master thesis

Évaluation de l’impact de la réponse adaptative sur la capacité de croissance de Bacillus cereus et Listeria monocytogenes

Abstract : Food is a complex microbial ecosystem that may contain spoilage or pathogenic microorganisms. Among the pathogenic microorganisms, Listeria monocytogenes and Bacillus cereus are two major foodborne pathogens that are widely distributed in the environment. Listeria monocytogenes is responsible for listeriosis and Bacillus cereus is responsible for infections characterized by diarrheal symptoms and intoxication resulting in emetic symptoms. The objective of this internship is to evaluate the impact of physiological state on the unicellular growth of Listeria monocytogenes and Bacillus cereus. Thus the data sets were generated from several adaptations. The analysis of the data sets identified that for the conditions studied, the physiological state has an insignificant impact on the population growth rate. On the other hand, an impact of the physiological state of the cells on the lag times of the different strains of Listeria monocytogenes and Bacillus cereus has been confirmed. In addition, the lag time of the previously adapted cells is shorter during a recovery in optimal condition. However, it is also necessary to test other stresses such as cold but also to identify specific biomarkers of bacterial adaptation that will help to better understand the behaviour of bacteria under stress.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/ulprive/BUS_M_2019_BA_ABOU.pdf
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https://hal.univ-lorraine.fr/hal-02548066
Contributor : Thèses Ul <>
Submitted on : Monday, April 20, 2020 - 2:32:13 PM
Last modification on : Monday, October 19, 2020 - 2:42:35 PM

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  • HAL Id : hal-02548066, version 1

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Abou Ba. Évaluation de l’impact de la réponse adaptative sur la capacité de croissance de Bacillus cereus et Listeria monocytogenes. Microbiologie et Parasitologie. 2019. ⟨hal-02548066⟩

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