title: A difference between intracellular and viral supercoiled PM2 DNA.
mesh_terms: D001435:Bacteriophages / Q000032:analysis*; D002499:Centrifugation, Density Gradient; D055598:Chemical Phenomena; D002621:Chemistry; D004279:DNA, Viral / Q000096:biosynthesis / Q000302:isolation & purification*; D010759:Phosphorus Isotopes; D011549:Pseudomonas / Q000378:metabolism; D013936:Thymidine / Q000378:metabolism; D014316:Tritium; D014461:Ultracentrifugation
chemical_list: D004279:DNA, Viral; D010759:Phosphorus Isotopes; D014316:Tritium; D013936:Thymidine