Electron microscopic analysis of contractile phage tail-like bacteriocins of three Pragia fontium strains and one Budvicia aquatica strain was performed. Fonticin and aquaticin are remarkably heat sensitive but trypsin resistant. Simultaneous production of contractile and flexible phage tail-like bacteriocins in the P. fontium 64613 strain is shown for the first time.

Department of Biology Faculty of Medicine Masaryk University Tomeova 12 CZ 602 00 Brno Czech Republic

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R-Type Fonticins Produced by Pragia fontium Form Large Pores with High Conductance

Occurrence of strains producing specific antibacterial inhibitory agents in five genera of Enterobacteriaceae