title: [Reproductive death and population kinetics of survived hamster cells in vitro during 48 hours following x-ray doses up to 800 Rad. II].
abstract: By means of a quantitative analysis, the time dependency of the number of dead cells and the resulting statement of cell numbers are compared with colony survival curves and with the distribution of colony sizes. The obtained periodical variation of reproductively killed cells is analyzed through population kinetics and is reduced to the number of those among the irradiated cells which show radiation-induced  lethal reproductive damage. Therefrom, together with both sorts of interphase-dead cells, the dose dependency of the three lethal fractions results, taking into consideration the quantitative cellular statement. The formation of maxima of reproductively killed cells at the intervals of generation time until F3-generation is explained by an autosynchronization of partly lethally injured cell populations. From colony size distributions a linear dose dependency of the mean colony size group can be derived; this is discussed in connection with DNA double strand breaks regarded as a possible cause of reproductive lethal damages. The data obtained concerning the development of a cell population with radiation damages are evaluated by the construction of phylogenetic schedules for every 300 rd and 500 rd. By this means, the underlying population kinetics is being revised quantitatively.
mesh_terms: D000818:Animals; D002455:Cell Division / Q000528:radiation effects*; D002470:Cell Survival / Q000528:radiation effects; D002478:Cells, Cultured / Q000528:radiation effects*; D006224:Cricetinae; D066298:In Vitro Techniques; D011830:Radiation Effects
vernacular_title: Reproduktivtod und Populationskinetik überlebender Hamsterzellen in vitro während 48 Stunden nach Röntgenstrahlendosen bis 800 Rad. II. Mitteilung