[Isolation of high molecular DNA of plasmids FBI and FBI drd from serologically typed strains of E. coli (AP1 and AP2)].
The authors elaborated a method of isolation of high molecular DNA from the plasmids FB1 and FB1drd of the conditionally pathogenic E. coli strains. Molecular weights of the isolated plasmid DNAs were determined by means of electrophoresis of the DNA fragments in agar gel and sedimentation in the neutral gradient of glycerine concentration.