[Stable inheritable increase in the level of cell mortality (experiments on Amoeba proteus exposed to heat and radiation)]

Amoeba proteus cultivated as individual lines qt 24 degrees C were exposed to heating at 29 degrees C during three days or to X-rays of 200 kv at a dose of 5 kh or to combination of both. The original method -- periodical resumption of individual lines from sister-cells -- was used to observe the offspring of amoebae during 8 months. It is found that not only radiation but slight heating as well induce unusual hereditary effect in amoebae: stable increase of cell mortality level. The effect was the same at combination of both radiation and heating. It is likely that radiation as well as temperature act on one and the same cell responsible system.