A simple multiwell tray for manipulation of radiolabeled nucleic acids on filter disks

This note describes a simple tray in which large numbers of radiolabeled nucleic acid samples mounted on paper or glass-fiber disks can be subjected to various treatments prior to counting by liquid scintillation spectrometry. The tray is useful for analysis of samples from ultracentrifugal fractionation of nucleic acids, for direct sampling of RNA or DNA polymerase assays in vitro, and for analysis of nucleic acid labeling in bacterial cultures.