Monographie de Roha, Hymenaea Verrucosa Gaertn

Monographie de Roha, Hymenaea Verrucosa Gaertn

Ce grand arbre en forme de parasol, de 6 à 24 mètres de haut, à feuilles persistantes plates et couronnées, est originaire d’Afrique Australe, d’Afrique de l'Est, de Mascareignes et particulièrement de Madagascar. Les racines, le tronc et les fruits produisent une résine dure (le Copal) utilisée comme encens. Les fleurs sont jaunâtres et les fruits sont uniques. Ces derniers sont durs et parsemés sur l'extérieur par des bulles de résine. Ils sont vert rougeâtre à maturité, mais brunis-sent sur le terrain.

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Thymus essential oils. Chemical composition and in vitro antioxidant and antibacterial activities

In the last years, there is an increasing concern regarding the safety and potentially adverse effects of synthetic chemicals used for food preservation or in medicine. Therefore, many research groups were interested to the functional role of natural products especially plant extracts. Essential oils extracted by distillation from aromatic plants are appreciated for their bioactive efficacy as fungicides, bacteriostatics, antioxidants, and other biological activities. In this study, the essential oils obtained from Thymus satureioides, Thymus vulgaris and Corydothymus capitatus by steam distillation were analyzed by gas chromatography coupled to mass spectrometry (GC-MS) in order to determine their chemical compositions. The results demonstrated that the major components of these essential oils are borneol, thymol and carvacrol respectively. Télécharger le résumé

The impact of oregano (origanum heracleoticum) essential oil and carvacrol on virulence gene transcription by escherichia coli O157:H7

Enterohaemorrhagic Escherichia coli (EHEC) serotype O157:H7was first recognized as a food pathogen in 1982 (Paton and Paton 1998). Since then, this organism has been implicated in sporadic cases and outbreaks of enterohaemorrhagic diarrhea worldwide (EFSA and ECDC 2013; Crim et al., 2014). EHEC O157:H7 is a member of the attaching and effacing (A/E) E. coli group. It possesses virulence factors essential for adhesion of the pathogen to intestinal epithelial cells (attachment) and is responsible for the destruction of the brush border ofmicrovilli (effacement) (Paton and Paton 1998). Télécharger l'étude complète