Journal
ARCHIVES OF MICROBIOLOGY
Volume 195, Issue 10-11, Pages 705-715Publisher
SPRINGER
DOI: 10.1007/s00203-013-0921-7
Keywords
Listeria monocytogenes; Freezing stress; Biofilm formation; Hydrophobicity; Fatty acids; Disinfectants
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The morphological changes and adhesive property of three Listeria monocytogenes strains submitted to freezing stress (-20 A degrees C) were studied. The atomic force micrographs showed a reduction in the cell size and an evolution to coccoid shape. The phenotypic slime production of L. monocytogenes and the expression of the adhesive gene were investigated before and after 10 months of incubation in salmon at -20A degrees. Our results showed that after ten months, stressed stains become more adherent and able to produce slime. In addition, we noted that this pathogen presents same physiological changes to adapt to starvation conditions. The cellular fatty acids composition of adhered and floating cells of three L. monocytogenes strains was taken into consideration. The stressed strains presented different chain lengths and therefore an increase in the hydrophobicity level. Moreover, we noted that the adhesive property of L. monocytogenes strains affects the Benzalkonium chloride bacterial sensitivity which increased after biofilm formation.
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