Automatic direct quantitation of radioactivity on paper chromatograms

Studies of Fluorinated Pyrimidines. XVIII. The Degradation of 5-Fluoro-2'-deoxyuridine and Related Compounds by Nucleoside Phosphorylase*

“…FU and FUDR were separated by electrophoresis for 2 hours at 2,250 v and 30-35 ma in 0.05 m sodium tetraborate, pH 9.2. The proportion of FUDR degraded to FU was determined by passing the strips through a windowless gas-flow strip-counter equipped with an integrator (Ludwig et al, 1960).…”

Glucose Metabolism in Normal Erythrocytes. I. Kinetics of the Hexokinase Reaction in Intact Cells

“…The radioactive spots on the filter paper strips were counted with an integrating chromatogram scanner (Ludwig et al 1960). The samples of red cell suspension from the washing experiment and the supernatant samples from the experiments on EDTA distribution were counted on aluminium planchets in an automatic gas flow counter (Friesecke & Hoepfner, Germany).…”

Chromatography

“…Radioactive materials may be measured by quantitative autoradiography (802) or by a variety of automatic scanners (179, 253, 276,684,787,1223). Windowless gas flow counters are used (85) and the paper may be counted from both sides (845,1264), but it is also possible to record the photoemission of a halogen-filled Geiger tube on photographic film (53).…”