. Biophysical science. Biophysics. (b) Metaphase. Chromosome B' does not line up on equatorial plate. (c) Anaphase. Chromosome B'drifts to one side without separating. (d) Telophase. Chromosome B' forms extra lobe on upper nucleus. Lower cell lacks B. Figure 6. Diagrammatic representation of abnormality result- ing from bombarding centromere of one chromosome with ionizing radiation. Similar results are obtained if the centromere is irradiated during metaphase. The reader is reminded that the chromosome shapes and numbers are purely diagrammatic. ionization is necessary in this critical volume
. Biophysical science. Biophysics. (b) Metaphase. Chromosome B' does not line up on equatorial plate. (c) Anaphase. Chromosome B'drifts to one side without separating. (d) Telophase. Chromosome B' forms extra lobe on upper nucleus. Lower cell lacks B. Figure 6. Diagrammatic representation of abnormality result- ing from bombarding centromere of one chromosome with ionizing radiation. Similar results are obtained if the centromere is irradiated during metaphase. The reader is reminded that the chromosome shapes and numbers are purely diagrammatic. ionization is necessary in this critical volume. In contrast, the changes induced by uv photons in the spindle were not direct effects; they could be induced by irradiation of any part of the cytoplasm. Thus, both direct and indirect effects are important. There are several exceptions to the rule that rapidly dividing cells are more sensitive to ionizing radiations than are other cells. Some types of rapidly growing tumors are quite insensitive, whereas lymphocytes which divide only occasionally are among the most sensitive. The reasons for these differences are not known. In all cases tested, a decrease of oxygen tends to decrease the effect of the ionizing radiation. Furthermore, certain substances such as the. 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 Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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