Download Cytokinesis in Animal Cells (Developmental and Cell Biology by R. Rappaport PDF

By R. Rappaport

ISBN-10: 0511529767

ISBN-13: 9780511529764

ISBN-10: 0521019362

ISBN-13: 9780521019361

ISBN-10: 0521401739

ISBN-13: 9780521401739

This publication strains the heritage of a few of the key rules within the box and provides an account of our present wisdom of animal cytokinesis. It includes descriptions of department in numerous types of cells and the proposed motives of the mechanisms underlying the obvious occasions. the writer additionally describes and explains experiments devised to check mobilephone department theories. The forces helpful for cytokinesis now seem to originate from the interplay of linear polymers and motor molecules that experience roles in strength construction, movement and form swap that happen in different stages of the biology of the cellphone. The localization of the force-producing mechanism to a constrained linear a part of the subsurface is attributable to the mitotic gear, a similar cytoskeletal constitution that insures orderly mitosis.

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Additional info for Cytokinesis in Animal Cells (Developmental and Cell Biology Series)

Example text

2. Cortical tension is generated by an initially even distribution of randomly oriented linear tension producing elements that are free to move in the plane of the cortex. 3. These elements are brought into a state of uniform activation. 4. " A rigorous description of the conditions that distribute the relaxing effect of the asters is necessary, and, in the original form of the theory, it was assumed that (1) the stimulus from the asters induces a relaxation of cortical tension proportional to the magnitude of the stimulus; (2) the stimulatory effect of each aster is spherically symmetrical and obeys an inverse power law; and (3) the level of stimulation at each point on the surface is the scalar sum of the stimulation from each aster.

At the same time that the equator constricted, McClendon saw surface movement from the poles that converged at the equator and then returned poleward through the axis of the elongated drop. Spek (1918) restudied the currents in cleaving nematode eggs and emphasized the similarity of the patterns in the oil drop models and the living eggs. Because of this great similarity, it was tempting to assume that the boundary forces that operated in the eggs originated in the same way as those that divided the oil drop.

The additional surface, he thought, was not formed by simple stretching of original surface. The role of the rays, he posited, was to move the newly available surface and prepare the way as the cleavage furrow cut through the cell. Ziegler (1895) pointed out that traction fiber theories were based on studies of stained, fixed cells. This line of speculation reached its apogee with Heidenhain and Rhumbler. The idea that traction fibers could explain the entire process of cytokinesis fell into disfavor, but the idea that their activity could account for some aspects of cytokinesis lingered in several theories that invoked multiple causal mechanisms.

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Cytokinesis in Animal Cells (Developmental and Cell Biology Series) by R. Rappaport


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