抄録
1. The capacity of D. discoideum to form the pseudoplasmodium and the fate of morphogenesis under the influence of various external agents were studied.
2. The formation of the pseudoplasmodium and further processes of morphogenesis were remarkably checked and delayed by KCN whereas inhibition by compounds such as monoiodoacetic acid and NaF was not conspicuous.
3. The presence of oxygen was required for the movement of the myxamoebae towards an aggregation center and the further stages of morphogenesis are increasingly sensitive to low oxygen tension. On the other hand, high oxygen tension such as that of pure oxygen had no effect on morphogenesis.
4. The pseudoplasmodium formation was remarkably inhibited by DNP and NaN3 even at the concentration where the respiration of the myxamoebae was rather stimulated than reduced.
5. Potassium and calcium ions showed contradictory effects on the number and the size of pseudoplasmodia as well as on the rate of morphogenesis.
6. The normal processes of morphogenesis were observable at pH 5, 6 and 7, but not at pH 3 and pH 8.
7. The morphogenetic process in relation to the population densities of the myxamoebae was investigated.
