. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. ATOAHC DYNAMICS OF PLANT GROWTH 885 \\\-iL.'lil (if :isli Time of the experimert (davs) (mgm) Wciglit of the total P (mgm) 'K;idio:ictive' P (mgm) 'Radioactive' P Total P Stem Leaf Stem Leaf Stem Leaf Stem First leaf Second leaf If we noW' determine by both chemical and. radioactive analysis the phosphorus co
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. ATOAHC DYNAMICS OF PLANT GROWTH 885 \\\-iL.'lil (if :isli Time of the experimert (davs) (mgm) Wciglit of the total P (mgm) 'K;idio:ictive' P (mgm) 'Radioactive' P Total P Stem Leaf Stem Leaf Stem Leaf Stem First leaf Second leaf If we noW' determine by both chemical and. radioactive analysis the phosphorus content of, for example, ash obtained after ignition of a leaf, we can determine how much of the total phosphorus present origi- nated from the culture solution, that is, the "radioactive", phospho- rus', and how much was already present in the plant at the beginning of Initial plant- Second leaves. Pirsr leavps O) t^lanl after qrowtli Fig L ^he experiment. The result of the chemical and the radioactive analysis is seen in the accompanying table. The chemical analysis was carried out by the colorimetric method described by Lohmann and Jendrasik^-\ and the radioactive analysis by comparing the activity of the ash of leaf or stem with Ihat of a known. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Hevesy, Georg von, 1885-1966. New York, Pergamon Press
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