Read e-book online Library of Little Masterpieces 30 Science PDF

By George Iles (editor)

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X. Some Views on a Mechanical Approach t o Ontogenetic Processes Mechanical stresses, in their simplest form being osmotically driven, should be considered as one of the most universal and phylogenetically ancient physical properties of living cells, including the Prokaryota (Harold, 1990). , Allan and Harrison, 1980; Ben Ze’ev, 1985; Braam and Davis, 1990). The idea has also been put forward that mechanically mediated cytoskeleta1 mechanisms may play a crucial role in developmental phenomena related traditionally to chemical inducers (Gordon and Brodland, 1987).

The protrusion-generating regime typical for the stretched suprablastoporal cells (arrows) is abruptly shifted to the microvilligenerating regime in the invaginating blastoporal cells (F, pointer). In E, the protrusive regime of a suprablastoporal cell is combined with the production of a few microvilli by the same cell. In B, E, and F, the outer cell membranes are stained with Ruthenium red. Bar = I gm. , 1988). 21 22 L. V. BELOUSSOV €7 AL. to-volume ratio (Fig. 8E-G). On the other hand, as shown earlier, tissue stretching promotes cell intercalation (Fig.

Bretcher, M. S. (1988). Fibroblasts on the move. J. Cell Biol. 106, 235-237. Burnside, B . (1971). Microtubules and microfilaments in newt neurulation. Deu. Biol. 26, 416-441. Christensen, 0. (1987). Mediation of cell volume regulation by Ca influx through stretchactivated channels. Nature (London) 330, 66-68. Dennerly, T. , Buxbaum, R. , and Heidemann, S. R. (1989). The cytomechanics of axonal elongation and retraction. J . Cell B i d . 109, 3073-3083. , and Wohlfarth-Bottermann, K. E. (1975).

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Library of Little Masterpieces 30 Science by George Iles (editor)


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