. 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. KIK -TrZ. TrZ Fig. 14.—Effect of radium upon regeneration of Clavelina lepadi- formis. K, control. V, irradiate tuated in the degeneration of the injured exposed to radium 7 hr., cut for cells. The branchial sac regenerated more ^r'^T mS^TTZs 'laSt slowly because of the lesser number of Differentiation has not proceeded normal mitoses in the early stages of the -„S^,'» ^^ ':S^:r,Zt. h! regen
. 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. KIK -TrZ. TrZ Fig. 14.—Effect of radium upon regeneration of Clavelina lepadi- formis. K, control. V, irradiate tuated in the degeneration of the injured exposed to radium 7 hr., cut for cells. The branchial sac regenerated more ^r'^T mS^TTZs 'laSt slowly because of the lesser number of Differentiation has not proceeded normal mitoses in the early stages of the -„S^,'» ^^ ':S^:r,Zt. h! regeneration and the appearance of abnor- heart; Kik, brachial basket; RK, mal mitoses after the longer exposures to ru',^^;^^fS:^T?oTf;u?eiler'TFr.!;; the rays, while the number of "Tropfenzel- Weigand, 67.) len " was found reduced after such exposures. In view of his limited study of the histology in the normal and the irradiated specimens and the contradiction by Brien of Spek's inter- pretations, which Weigand accepted, it is impossible to draw any con- clusions from these experiments by Weigand, except that the irradiation exercised an inhibiting effect, as in other cases, and that abnormal mitoses were induced. If Brien's conclusions regarding undifferentiated mesenchyme cells are correct, these cells are presumably the ones most affected and the disturbance of their multiplication or their death would explain the retardation of regeneration that Weigand observed. AMPHIBIA In vertebrates the amphibia have presented the most favorable mate- rial for studies upon regeneration. The urodeles in particular have been. 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 Or
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Keywords: ., bookau, bookcentury1900, booksubjectbiology, booksubjectradiation
