title: Differential density labeling and gradient centrifugation of Tetrahymena: a new procedure for selection synchrony.
mesh_terms: D000818:Animals; D002452:Cell Count; D002455:Cell Division; D002499:Centrifugation, Density Gradient; D003584:Cytological Techniques; D004247:DNA / Q000096:biosynthesis; D007501:Iron; D007553:Isotope Labeling; D007700:Kinetics; D008858:Microscopy, Phase-Contrast; D013635:Tantalum; D013769:Tetrahymena pyriformis / Q000166:cytology*; D013936:Thymidine / Q000378:metabolism; D013997:Time Factors; D014316:Tritium
chemical_list: D014316:Tritium; D013635:Tantalum; D004247:DNA; D007501:Iron; D013936:Thymidine