By R. Rappaport
This booklet lines the heritage of a few of the main rules within the box and provides an account of our present wisdom of animal cytokinesis. It includes descriptions of department in numerous forms of cells and the proposed motives of the mechanisms underlying the noticeable occasions. the writer additionally describes and explains experiments devised to check telephone department theories. The forces priceless for cytokinesis now seem to originate from the interplay of linear polymers and motor molecules that experience roles in strength construction, movement and form switch that take place in different stages of the biology of the mobile. The localization of the force-producing mechanism to a constrained linear a part of the subsurface is because of the mitotic gear, a similar cytoskeletal constitution that insures orderly mitosis.
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Extra info for Cytokinesis in Animal Cells (Developmental and Cell Biology Series)
Scott (1946) concurred with the equatorial contracting ring hypothesis and focused his attention on the factors that determine the placement of the ring. Studies of the effects of cold and hypotonicity on the shape of cleaving sea urchin eggs led him to propose that any deforming force that established an isthmus in a cell would result in the development of a contracting ring, provided that the egg was in a cleavage phase. He considered an actively elongating spindle, enlarging gelated asters, and endoplasmic flow as potential causes of deformation.
The foregoing is, of course, not a hypothesis, but a description. It appears to contain all the structural elements and activities that would be necessary to divide a cell by a diastema mechanism and, in fact, it seems more complete than most of the theoretical mechanisms of this kind that were subsequently presented. Her observations, however, have not been confirmed, and it is unclear what they were based upon. The existence of diastema in a variety of cell types appears to have been widely accepted in the early years of the 20th century.
The granules were transformed into vacuoles by swelling. The vacuoles then fused to form the new cell surface between the daughter blastomeres. Motomura did not speculate about the mechanism that aligns the granules and vacuoles in the equatorial plane. Diastema activity appeared especially likely during the cleavage of the large, yolky, pigmented eggs of some amphibia and primitive fish. For not only has the existence of prefurrow platelike structures in the equatorial plane been reported in this cell type for many years, but the relatively unpigmented surface in the deepening furrow of some cells has also supported the idea that the furrow surface is newly formed and not simply stretched precleavage surface.
Cytokinesis in Animal Cells (Developmental and Cell Biology Series) by R. Rappaport