title: A tube-cutting device for fractionating preparative gradients from the ultracentrifuge.
mesh_terms: D000818:Animals; D001412:Bacillus subtilis; D001435:Bacteriophages; D002499:Centrifugation, Density Gradient / Q000295:instrumentation / Q000379:methods*; D046508:Culture Techniques; D004247:DNA / Q000032:analysis; D005347:Fibroblasts; D051379:Mice; D009174:Mycoplasma; D013936:Thymidine / Q000378:metabolism; D014316:Tritium
chemical_list: D014316:Tritium; D004247:DNA; D013936:Thymidine