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- W92685545 abstract "The species of the Lactobacillus genus are generally believed to be microorganisms with no pathogenic potential. Many of them have granted GRAS and QPS status. Non-pathogenic bacteria as lactobacilli-intentionally added or accidentally present in food-are under evaluation, as they could act as reservoir of resistant genes. This thesis was aimed to evaluate some methods used for testing and to characterize some Lactobacillus species, as regards their safety and potential probiotic activity.The first part of the research focused on the comparison of two broth microdilution methods: ISO and CLSI, in order to assess the resistance of 54 L. plantarum strains to antimicrobial agents. The results suggest better performances of the phenotypic assay developed by ISO, at least for strains belonging to L. plantarum species.Then the assessment of the PCR detection limit for 8 sets of primers for the detection of lactobacilli and bifidobacteria from infant faeces confirmed different levels of effectiveness for the primers. Next part of the thesis was the research project aimed at identifying genes or genetic loci of different strains of two Lactobacillus species (i.e. Lactobacillus paracasei and Lactobacillus rhamnosus) involved in the interaction with the host, immune-modulation of host cells and pathogen growth inhibition in order to find new probiotic strains. The phenotypic analysis of 40 selected strains demonstrated large variability between strains of these species, which could serve to the association of phenotypic differences to genome specificities. A strain of Lactobacillus mucosae was found within the framework of the same project. As it is a relatively new species, it was chosen to further investigate its properties, comparing it with three other L. mucosae strains. This study led to confirm some information but first and foremost it has provided new data on the examined species." @default.
- W92685545 created "2016-06-24" @default.
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- W92685545 date "2012-02-23" @default.
- W92685545 modified "2023-09-23" @default.
- W92685545 title "Characterization of gut derived lactobacilli" @default.
- W92685545 hasPublicationYear "2012" @default.
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