. 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. REGENERATION 437 TrZ regeneration only to that extent. The cells that are important in the formation of new parts are certain undifferentiated cells of the meso- dermal region which Brien regards as representing an embryonic reserve to be found in tunicates and in many other animals. In a brief study of the effects of radium irradiation upon Clavelina lepadiformis, Weigand (67) has shown tha
. 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. REGENERATION 437 TrZ regeneration only to that extent. The cells that are important in the formation of new parts are certain undifferentiated cells of the meso- dermal region which Brien regards as representing an embryonic reserve to be found in tunicates and in many other animals. In a brief study of the effects of radium irradiation upon Clavelina lepadiformis, Weigand (67) has shown that the regeneration can be affected by this means in the same manner as in planarians. A retarda- tion appeared externally in the later appearance of the caps of cells at the injured regions and the slower regenerative growth and differentiation (Fig. 14). The effect increased with longer exposures, but a complete inhibition was not obtained with the maxi- mum ones used in Weigand's experiments. His study of the normal histology of the regeneration was brief and not conclusive, although he observed that regeneration of the branchial sac began without mitoses. The source of the regenerative cells was not clear, but the " Tropfenzellen " of Spek (54) did not participate. Mitoses were observed later in the regenerative cells as differentiation proceeded and mitoses were also observed in "; Histo- logical study of the irradiates showed abnormal mitoses which apparently even-. KIK -TrZ. 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 Lo
Size: 948px × 2637px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookau, bookcentury1900, booksubjectbiology, booksubjectradiation
