The advantage of mucus for adhesive locomotion in gastropods
The advantage of mucus for adhesive locomotion in gastropods
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DOI：
10.1016/j.jtbi.2014.02.024
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发表时间：
2014-07-21
影响因子：
2
通讯作者：
Kobayashi, Ryo
中科院分区：
文献类型：
--
作者：
Iwamoto, Mayuko;Ueyama, Daishin;Kobayashi, Ryo
对于许多腹足动物来说，运动是由沿着足部移动的一系列周期性肌肉波（收缩和松弛）驱动的。这些波产生的力通过一层薄薄的踏板粘液耦合到基质上。腹足足足粘液具有不同寻常的物理性质：粘液是一种小变形的粘弹性固体，并显示出尖锐的屈服点；然后，在更大的压力下，粘液是一种粘性液体，尽管如果允许愈合一定时间它会恢复其固体状态。在本文中，为了阐明粘液和柔性肌波在粘附运动中的作用，我们使用一个简单的数学模型来验证可以通过周期性肌波与粘液的特定物理特征之间的相互作用来实现定向迁移。我们的结果表明，粘液的滞后特性对于控制动摩擦以实现爬行运动至关重要。此外，我们的数值计算表明，粘液的滞后特性和肌肉的收缩率都会产生两种运动方式：直行波和逆行波，迄今为止，这两种运动方式都通过不同的机制进行了解释。还讨论了粘液在粘附运动中的生物力学有效性。 (C) 2014 Elsevier Ltd. 保留所有权利。
For many gastropods, locomotion is driven by a succession of periodic muscular waves (contractions and relaxations) moving along the foot. The force generated by these waves is coupled to the substratum by a thin layer of pedal mucus. Gastropod pedal mucus has unusual physical properties: the mucus is a viscoelastic solid at small deformation and shows a sharp yield point; then, at greater strains, the mucus is a viscous liquid, although it will recover its solidity if allowed to heal for a certain period. In this paper, to clarify the role of the mucus and the flexible muscular waves in adhesive locomotion, we use a simple mathematical model to verify that directional migration can be realized through the interaction between the periodic muscular waves and the specific physical features of mucus. Our results indicate that the hysteresis property of mucus is essential in controlling kinetic friction for the realization of crawling locomotion. Furthermore, our numerical calculations show that both the hysteresis property of mucus and the contraction ratio of muscle give rise to two styles of locomotion, direct waves and retrograde waves, which until now have been explained by different mechanisms. The biomechanical effectiveness of mucus in adhesive locomotion is also discussed. (C) 2014 Elsevier Ltd. All rights reserved.