title: Identification of PK 1 bacteriophage DNA in Streptococcus mutans.
abstract: A lysogenic bacteriophage PK 1 and plasmid DNA's in Streptococcus mutans PK 1 have been characterized by electron microscopy PK 1 phage DNA molecules were observed in both linear and circular forms, which gave the molecular weights of (28.9 +/- 0.4) x 10(6) and (27.4 +/- 0.2) X 10(6) daltons, respectively. Plasmid DNA has a molecular weight of 4.0 X 10(6) daltons. No difference of density in CsCl density gradient between linear and circular forms of phage DNA and plasmid DNA was observed.
mesh_terms: D001435:Bacteriophages / Q000235:genetics* / Q000648:ultrastructure; D055598:Chemical Phenomena; D002621:Chemistry; D004279:DNA, Viral / Q000235:genetics / Q000302:isolation & purification*; D008854:Microscopy, Electron; D010957:Plasmids; D013295:Streptococcus mutans / Q000235:genetics
chemical_list: D004279:DNA, Viral