c6te atlantique fran~aise pouvant prisenter un inter& medical, nous avons fait un 152 samples (91 species) of marine al-screening antibacterien et antifongique. gae of French Atlantic coast have been Contrairement ? i la presque totaliti des investigated for their antimicrobial (anti-etudes anterieures, ce screening a combacterial and antifungal) activity. For porte un seuil d e detection, nous perrneteach sample, three extracts, prepared tant de mettre en evidence les especes les with E t 2 0 , then E t O H 99 %, then H,O, plus interessantes. were tested. The largest proportion of active species occurs in Cystoseiraceae, Bonnemaisoniaceae and Rhodomelaceae. Partie experimentale lntroduction La mer semble possider un certain pouvoir d ' a~t o e~u r a t i o n bactiriologique. Celui-ci serait dG, en particulier, aux algues [20]. Depuis une vingtaine d'annees, de nombreuses itudes ont ete faites sur ce sujet [2, 7, 14, 16, . .
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