The object of this work was to study the physico-chemical and biological properties of DNAs of the biodegradation plasmids NAH and SAL. A comparative analysis of the physico-chemical parameters for these DNAs made it possible to detect a number of identical properties in them: the same sedimentation profile for covalently-closed circular DNA forms, 68--70 S; the molecular weight of ca. 50 MD; a roughly equal number of fragments (up to 23) was found when the DNAs of NAH and SAL were restricted by EcoRI endonuclease. The transformation of the plasmidless strain PpGI was done.
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