Die Wirkung eines Komplexbildners und von Metallionen auf die Ausprägung dessnaky- undMonstra-Charakters beiParamaecium aurelia

Summary

This paper presents new facts on the problem of the inherited defects of cell separation inParamecium aurelia (Mo-strain andsnaky, cf.Maly 1958, 1960).

The complexing agent EDTA, when added to the culture medium, causes a drastic increase in monster formation in thesnaky-strain, a much smaller increase in theMo-strain and no effect in the normal strain. This effect can be compensated by the addition of different metal ions and evidence is presented that the addition of iron or cobalt to the medium normalises thesnaky- andMo-strains: the separation of the cells runs normally. It is suggested that the aldolase in thesnaky-strain and in the „defective” particles of theMo-strain differs from that in the normal strain.