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The effect of centrifugal force on the spermatocyte of grasshopper with special reference to the structure of the spindle and the formation of the furrow



The effect of centrifugal force on the spermatocyte of grasshopper with special reference to the structure of the spindle and the formation of the furrow



Sci Rep Tohoku Univ Ser Iv Biol 30(3/4): 171-178



The effects of centrifugal force on the spermatocyte of the grasshopper, Mecosthetus magister, were studied in living and fixed materials. From the distortion of the mitotic spindle and the behavior of the chromosomes as seen in fixed preparation, it is concluded that the mitotic apparatus of this species is a coherent body characterized as a gel, and the chromosomal fibers, connecting kinetochores and the poles anchored in the superficial cytoplasm of the cell, have a morphological basis in the living state. The living spermatocytes so treated continue their mitotic activity. From this observation, it is considered that the plane of division is formed in correlation with the position of the mitotic apparatus of anaphase; however, beyond the late anaphase stage, it is formed independently irrespective of the position of the mitotic apparatus. Judging from the present results, it is concluded that not only the mitotic apparatus but also the mitochondria and the other cellular component cooperating with each other, take part in the normal course of cell division.

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