プラナリア(Dugesia gonocephala)の虫体抽出液が示す分裂促進作用(予報)

概要

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The effect of a planarian water extract on the occurrence of fission was studied in the planarian, Dugesia gonocephala. Intact worms were cultured in a dilute extract of anterior body-halves. It was found that fission was greatly promoted in worms cultured in the water extract as compared with controls. The active principle, which was contained in the water extract, as found to be heat stable (100℃, 30 min.) and acetone insoluble. In order to determine the distribution of the active principle along the body axis, tests were made with water extracts from the head, middle and tail regions respectively. The greatest fission-promoting activity was found in the head extract; the extract of the middle region showed considerable activity. The tail extract had little effect, if any, on the occurrece of fission. The fission-promoting substance seems to decrease gradually in quantity from head to tail. The possible mechanism of the action of the fission-promoting substance is discussed in relation to head dominance.
1964-02-15