pertucin , a bacteriocin active against phase i organisms of bordetella pertussis , was extracted from pseudomonas pertucinogena , strain 190 or 6627 , by freezing and thawing of bacteria-free agar medium and was purified by ammonium sulfate fractionation , dialysis , zinc chloride precipitation , and polyacrylamide gel electrophoresis .
C0006017
bordetella
C0004611
bacteria