ウニ未受精卵表層の弾性 : 生物のレオロジー
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概要
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For the purpose of evaluating the surface of sea-urchin eggs the compression method developed by Cole (1932) was critically applied using unfertilized eggs of Hemicentrotus pulcherrimus. This method is to compress the egg between the two parallel plates with a known force (F), and to evaluate the surface force (t) by the equation, F/A=TC, where C is the average curvature of the egg surface and A is the area of contact area A was found to be technically difficult, since the angle of contact is usually close to 180^o. Relatively large error in the measurement of A invalidates Cole's conclusion that the surface force increases as the surface is streched on compression which, in turn, indicates elasticity of the cortex. The several attempts hitherto made to obtain reliable figures for the contact area were in vain. Therefore, avoiding such a parameter, the author derived a new equation F=-T×(dS/dZ), where S is the surface area of the cell. the evaluation by the new equation has given a result which sharply disagrees with Cole's result : that is, the surface force is found to remain constant in spite of the change in the surface area. As a matter of fact, the contour of the compressed egg could be faithfully reproduced by calculations, assuming no elasticity in the cortex. Further, the surface force did not significantly change on swelling or shrinkage of the egg by osmosis. It is concluded that the cortex of the sea-urchin egg has no appreciable elasticity, suggesting lability of the structure of the cell surface.
- 社団法人日本材料学会の論文
- 1964-05-15