File:Radium, X rays and the living cell (1915) (14582080849).jpg

Identifier: radiumxrayslivin00colwrich (find matches)
Title: Radium, X rays and the living cell
Year: 1915 (1910s)
Authors: Colwell, Hector Alfred Russ, Sidney
Subjects: X-rays -- Physiological effect
Publisher: London, G. Bell and sons
Contributing Library: University of California Libraries
Digitizing Sponsor: MSN

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the results depicted in Fig. 46. It will be seen that, as a resultof irradiation for 30 minutes, there is a slower growth of theirradiated than of the untreated tumour when the inoculationsare made into the same rat. When the period of irradiation isincreased to 90 minutes, the inoculated material, although MALIGNANT CELLS 257 apparently increasing in size for some days, was eventuallyabsorbed in the animal, which was simultaneously supportingthe growth of the control tumour ; extension of the period ofirradiation to three hours ensures the progressive and completeabsorption of the tumour cells. Exposure of an emulsion of these malignant cells to radiumemanation may in a similar manner prevent their growth wheninoculated into animals. If the exposure be not too prolonged,there is a delayed onset of growth when the cells are inoculated,and it is interesting to find that the rate of growth of the tumours Days a ft eh I/voculatioi-v. 7 10 f 7 12- 7 ^o /^ 7 zz 7 C /■ 7 ti. 3 ^/SadihJed,
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//.w^..°_..°....©.-f.y XydcLcUoykcLV^adia^ed. o D 0 o 0 0 ■t 0. OfliJ.U ^.3.9^. <B <Q Fig. 46. resulting therefrom is markedly less than that of the normaltumour. By exposing an emulsion of Jensens rat sarcoma to.275 milli-curie for 30 minutes and inoculating the emulsion,tumours grew, but very slowly, actually about one-third of thenormal rate, and by successive transplantations from this slowly-growing tumour for more than a year, the tumour was stillfound to be growing at about one-third of the normal rate ; thispersistence of a lowered rate of growth is analogous to the per-sistence of new histological characters imposed upon a tumourby X rays (ijide p. 273). Tumour cells therefore, if irradiated outside the animal, may 258 MALIGNANT CELLS be given an accurately measured quantity of beta rays, so thatwhen the cells are re-inoculatcd, they will not produce growingtu

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