. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. ADVENTURES IN RADIOISOTOPE RESEARCH 521 Table 1. — Disappeakance of Labelled Acid- soluble P Compounds from the Cokpuscles Time elapsed after injecting the blood of rabbit B into rabbit A Per cent of labelled acid-soluble P injected, present in 1 cc. corpuscle of rabbit A min 5 „ ,, „ „ 60 „ 120 „ 210 „ 100 .2x> a. a> o a. _3 o s. mm. Fig. 1. Disappearance of labelled acid-soluble P from corpuscles, injected into the circulation of a rabbit. DISCUSSION The s
. Adventures in radioisotope research;. Radioactive tracers; Radiobiology. ADVENTURES IN RADIOISOTOPE RESEARCH 521 Table 1. — Disappeakance of Labelled Acid- soluble P Compounds from the Cokpuscles Time elapsed after injecting the blood of rabbit B into rabbit A Per cent of labelled acid-soluble P injected, present in 1 cc. corpuscle of rabbit A min 5 „ ,, „ „ 60 „ 120 „ 210 „ 100 .2x> a. a> o a. _3 o s. mm. Fig. 1. Disappearance of labelled acid-soluble P from corpuscles, injected into the circulation of a rabbit. DISCUSSION The sole difference between the normal and the labelled corpuscles is that in some of the molecules present in the normal ones P (having the mass number 31) is replaced by radioactive P (having the mass number 32). In 1 cc. corpuscles of rabbit B, mgm phosphatide P was present. Of these mgm, lO^^^ mgm were radioactive ^^P atoms. As 1 cc. contains about 3 • 10^ corpuscles, one corpuscle contains on an average 10^^^ mgm 32p or only about one corpuscle in a hundred contained an active phos- phatide molecule. After injecting the blood sample of rabbit B into rabbit A, a strong dilution of the labelled phosphatides took place: only one in about three thousand corpuscles now contains a radioactive phospha- tide P atom. The replacement of a minute percentage of the ^ip atoms by 32p atoms in the P compounds of the corpuscles can hardly influence to any noticeable extent the chemical properties of the corpuscles and. 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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