. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. ^^f. Uv5«ys.#«CV^ lsa: RZ' 0k. PhT Fig. 9.—Effect of radium upon cells of Polycelis nigra. Left—a sagittal section through posterior end of a head piece, used as control and killed 4 days after operation, showing normal accumulation of cells that form the cap of regenerative tissue visible externally. Right—sagittal section through posterior end of an irradiated head piece exposed 6 hr., cut
. Biological effects of radiation; mechanism and measurement of radiation, applications in biology, photochemical reactions, effects of radiant energy on organisms and organic products. Radiation; Biology. ^^f. Uv5«ys.#«CV^ lsa: RZ' 0k. PhT Fig. 9.—Effect of radium upon cells of Polycelis nigra. Left—a sagittal section through posterior end of a head piece, used as control and killed 4 days after operation, showing normal accumulation of cells that form the cap of regenerative tissue visible externally. Right—sagittal section through posterior end of an irradiated head piece exposed 6 hr., cut immediately thereafter, and killed 6 days after such exposure and operation. Compare the parenchyma with that shown in Fig. 5, right. There is no cap of regenerative cells. The wound has been healed by extension of the old epithelium. Da, gut lobe; Ep, epithe- lium; Pa, parenchyma; Ph, pharynx; PhT, pharynx sheath; Pig, pigment; RZ, regenerative cells. (From Weigand, 67.) 4 or 5 days after the exposure. In worms cut immediately after irradia- tion of from 3 to 15 hr. (Fig. 9) healing occurred in the irradiates in the same manner as in controls by extension of the old epithelium; but there. 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 Duggar, Benjamin M. (Benjamin Minge), 1872-1956; National Research Council (U. S. ). Committee on the Effects of Radiation on Living Organisms; Clark, Janet Howell, b. 1889; Cole, Kenneth Stewart, 1900-; Daniels, Farrington, 1889-1972. New York and London, McGraw-Hill Book Co.
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