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  • 1
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    Automated Shell Theory for Rotating Structures (ASTROS) (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Computer program can be used to analyze any disk or shell of revolution of arbitrary cross section under inertial loads caused by rotation about shell axis and under various static loads, including thermal gradients. Geometric shapes incorporated in program are ellipsoidal, spherical, ogival, toroidal, conical, circular plate, cylindrical, and parabolic.
    Keywords: MATHEMATICS AND INFORMATION SCIENCES
    Type: MFS-21970
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Lymphoid cell kinetics under continuous low dose-rate gamma irradiation: A comparison study (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: A comparison study was conducted of the effects of continuous low dose-rate gamma irradiation on cell population kinetics of lymphoid tissue (white pulp) of the mouse spleen with findings as they relate to the mouse thymus. Experimental techniques employed included autoradiography and specific labeling with tritiated thymidine (TdR-(h-3)). The problem studied involved the mechanism of cell proliferation of lymphoid tissue of the mouse spleen and thymus under the stress of continuous irradiation at a dose rate of 10 roentgens (R) per day for 105 days (15 weeks). The aim was to determine whether or not a steady state or near-steady state of cell population could be established for this period of time, and what compensatory mechanisms of cell population were involved.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-143262
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Lymphoid cell kinetics under continuous low dose-rate gamma irradiation: A comparison study (1975)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The mechanism of cell proliferation is studied in the lymphoid tissue of the mouse spleen under the stress of continuous irradiation at a dose-rate of 10 roentgens per day for 105 days. Autoradiography and specific labeling with tritiated thymidine were utilized. It was found that at least four compensatory mechanisms maintained a near-steady state of cellular growth: (1) an increase in the proportion of PAS-positive cells which stimulate mitotic activity, (2) maturation arrest of proliferating and differentiating cells which tend to replenish the cells damaged or destroyed by irradiation, (3) an increase in the proportion of cells proliferating, and (4) an increase in the proportion of precursor cells. The results are compared to previous findings observed in the thymus.
    Keywords: AEROSPACE MEDICINE
    Type: NASA-CR-142068
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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