In an attempt to elucidate the influence of the substances of allithiamine group on the growth and development, the author, as the first step, planned to conduct a comparative examination of the influences of TPD and vitamin B
1 on the general development of chick embryo. Simultaneously, the excretion of vitamin B
1 into the allantoic fluid of the developing eggs treated with vitamin B
1 or with TPD, and the total vitamin B
1 content in the liver were examined, thereby the author attempted to get further clearer biological significance of TPD. The following is the results thus obtained.
No remarkable influence of vitamin B
1 or TPD on the general development of chick embryo was recognized. However, when treated with a large dose, certain inhibition on the development was recognized, and a stronger inhibitive tendency was noted in the case of TPD.
The excretion of vitamin B
1 into the allantoic fluid and the total vitamin B
1 content in the liver were found increased by the treatment with vitamin B1 or with TPD. Especially, the excretion of vitamin B
1 was found more strongly increased generally in the case of TPD. On the other hand, the total vitamin B
1 content in the liver showed a tendency to be larger in the case of vitamin B
1 compared with the case of TPD.
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