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Biol Bull 93: 139-162. (October 1947)
© 1947 Marine Biological Laboratory
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BEHAVIOR OF THE CELL SURFACE DURING CLEAVAGE. VII. ON THE DIVISION MECHANISM OF CELLS WITH EXCENTRIC NUCLEI

KATSUMA DAN 1 and JEAN CLARK DAN 1

1 Misaki Marine Biological Station, Misaki, Kanagawa-ken and Zoology Department, Faculty of Science, Tokyo Imperial University, Tokyo

1. Study was made of the cleavage of cells with excentric mitotic figures.

2. In the division of such cells, (a) the cleavage furrow appears from the side of the cells nearest to the mitotic figure, (b) the asters rotate, causing the animal hemispheres to converge, and (c) the spindle bends, with the convex side directed toward the vegetal pole.

3. This situation can be explained by thinking that the mechanical resistance for the elongating spindle is different in magnitude on its two sides as a result of the excentricity of the mitotic figure.

4. The above situations can be artificially induced in materials which never show them normally, by producing a similar unbalanced resistance on the two sides of the spindle.

5. Gray's theory concerning the mechanism of the formation of one-sided cleavage furrows is discussed.






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Copyright © 1947 by the Marine Biological Laboratory.