A remarkable feature of Mimosa pudica is its ability to deform in response to certain external stimuli. Here, a two-dimensional transient bio-chemo-electro-mechanical model of the rapid movement of the main pulvinus of Mimosa pudica is developed. Based on the laws of mass and momentum conservation, poroelasticity, and representative volume elements, a novel fluid pressure equation is proposed to characterize the cell elasticity. Experiments were conducted to measure the time and amplitude of the rapid movement. After examinations with the published experiments, it is confirmed that the model can predict well the ionic concentrations, petiole bending angle, and membrane potential. The simulation analysis of the biophysical properties provides insights to biomechanics: the hydrostatic pressure in the lowest extensor decreases from 0.35 to 0.05 MPa at t = 0.00 to 3.00 s; fluid pressure increases from 0.00 to 0.11 MPa at t = 0.00 to 0.14 s; and the peak bending angle increases from 57.0° to 70.9° when the reflection coefficient is assigned as 0.10 to 0.20 in the model. The results highlight the biochemical actuation mechanism of the Mimosa pudica movement, and they confirm the importance of ionic and water transports for causing changes in osmotic and hydrostatic pressures.

中文翻译：

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含羞草快速运动的生物化学-电子-机械模型。

含羞草的显着特征是其对某些外部刺激产生变形的能力。在此，建立了含羞草主果皮快速运动的二维瞬态生物化学-机电模型。基于质量和动量守恒，多孔弹性和代表性体积元素的定律，提出了一个新的流体压力方程来表征细胞的弹性。进行实验以测量快速运动的时间和幅度。经过已发表实验的检验，证实该模型可以很好地预测离子浓度，叶柄弯曲角度和膜电位。对生物物理特性的模拟分析为生物力学提供了见解：最低伸肌的静水压力从0.35降低至0。t = 0.00至3.00 s时为05 MPa; 在t = 0.00到0.14 s时流体压力从0.00 MPa增加到0.11 MPa; 在模型中将反射系数指定为0.10到0.20时，峰值弯曲角度从57.0°增大到70.9°。结果突出了含羞草运动的生物化学驱动机制，并证实了离子和水传输对于引起渗透压和静水压力变化的重要性。