Kaliuzhnaia A P, Matvienko N I, Shchipkov V P, Pekhov A P
Biull Eksp Biol Med. 1976 Dec;82(12):1492-4.
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.