X-Ray Studies on Paramecins and Kappas of Variety 4 of Paramecium aurelia

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Abstract
One of the problems raised in connection with the killer character in P. aurelia concerns the relationship between the killer cytoplasmic factor, kappa, and its killing agent, paramecin. This study represents an attempt to elucidate the relationship through a comparison of the relative X-ray sensitivities of the 2 kinds of particles. The fact that kappa particles are much more readily inactivated (37% survival at about 1860r) than are paramecin particles (37% survival at about 26,000r) demonstrates that kappa activity and paramecin activity do not have identical " physical bases. It is considered possible, however, that the 2 kinds of activities are associated with the same particles, those identified cytologically as kappa.