チオ尿素による渦虫の眼色素消失と飢餓による体色素消失

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Effects of thiourea on the eye pigment and culture conditions which bring about the disappearance of skin pigment are here studied in Dugesia gonocephala. When the planaria is cultured in thiourea solution, only the pigment granules in the eyes desappear as already pointed out by KAMBARA ('54). When the normal worm is kept in starvation, the eye pigment is not affected at all, while the body pigment disappears. The skin-depigmentation progresses from the head-end towards the pharyngeal base, and then from the tail end. Pharyngeal region and its neighborhood are most slow in the depigmentation (Fig. 1). When the 5-cut-pieces are cultured in the solution of 0.1% thiourea, the eye pigment of the regenerating head is of lighter colour than the pigment of the normal eye, and later the eye-spots become gradually decolorized. The speed of the disappearance of these eye-spots is rapid in pieces A and C (Fig. 2, B) which are taken from the region of high head-frequency. In this case, the effect of the solution of thiourea on the formation of head form is not recognized. When the pieces of the worm, the eye-spots of which have been depigmented by thiourea, are cultured in well water, the head-frequency on the eighth day after the cutting shows higher rate than in the control (Fig. 2, A). In the present, other effects on regeneration than those described above are not recognized. When the decerebrated worm is cultured in thiourea solution, the eye pigment takes more days to disappear than in the control (Table 2).
社団法人日本動物学会の論文
1956-10-15

チオ尿素による渦虫の眼色素消失と飢餓による体色素消失

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