Yoneda Mitsuki
Department of Zoology, Faculty of Science, Kyoto University, Kyoto 606, Japan and Stazione Zoologica, Napoli, Italy.
Dev Growth Differ. 1980;22(1):39-47. doi: 10.1111/j.1440-169X.1980.00039.x.
Unfertilized eggs of the sea urchin, Paracentrotus lividus, were placed between two parallel plates and flattened by a definite force to 20% of their original diameter, with two-fold increase in their surface area. The resulting tension at their surface was calculated from the relation of force and deformation. In spite of this extensive stretching, the tension was found to be not more than 0.2 dyne/cm, while under conditions involving mild stretching (3%) the tension still amounted to 0.12 dyne/cm. These results do not support Mela's theory (7, 8), which predicts a transition of the mechanical properties of the egg surface from a 'subelastic' to 'elastic' state when the surface is stretched to beyond 34% of its initial area.
将海胆（Paracentrotus lividus）的未受精卵置于两块平行板之间，用一定的力将其压扁至原始直径的20%，表面积增加了两倍。根据力与变形的关系计算出其表面产生的张力。尽管进行了如此大幅度的拉伸，但发现张力不超过0.2达因/厘米，而在轻度拉伸（3%）的情况下，张力仍达0.12达因/厘米。这些结果不支持梅拉的理论（7, 8），该理论预测当卵表面拉伸超过其初始面积的34%时，卵表面的力学性质会从“亚弹性”状态转变为“弹性”状态。
