Odd dynamics of living chiral crystals
Odd dynamics of living chiral crystals
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DOI：
10.1038/s41586-022-04889-6
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发表时间：
2022-07-14
期刊：
影响因子：
64.8
通讯作者：
Fakhri, Nikta
中科院分区：
文献类型：
--
作者：
Tan, Tzer Han;Mietke, Alexander;Fakhri, Nikta
活性晶体是运动物体自组织产生的高度有序结构，在合成（1，2）和细菌（3，4）活性物质中得到了广泛的研究。持久的水晶秩序是否能在自主发育的多细胞生物群体中出现，目前尚不清楚。在这里，我们展示了游泳的海星胚胎自发地组装成手性晶体，这些晶体跨越数千个旋转的生物体，并持续数十小时。结合实验，理论和模拟，我们证明，这些活晶体的形成，动力学和溶解的流体动力学特性和胚胎的自然发育控制。值得注意的是，活的手性晶体表现出自维持的手性振荡以及最近预测的奇弹性材料（5，6）的各种非常规变形响应行为。我们的研究结果提供了直接的实验证据，如何自主多细胞组件之间的非互惠相互作用可能会促进手性活性物质的非平衡相。
Active crystals are highly ordered structures that emerge from the self-organization of motile objects, and have been widely studied in synthetic(1,2) and bacterial(3,4) active matter. Whether persistent crystalline order can emerge in groups of autonomously developing multicellular organisms is currently unknown. Here we show that swimming starfish embryos spontaneously assemble into chiral crystals that span thousands of spinning organisms and persist for tens of hours. Combining experiments, theory and simulations, we demonstrate that the formation, dynamics and dissolution of these living crystals are controlled by the hydrodynamic properties and the natural development of embryos. Remarkably, living chiral crystals exhibit self-sustained chiral oscillations as well as various unconventional deformation response behaviours recently predicted for odd elastic materials(5,6). Our results provide direct experimental evidence for how non-reciprocal interactions between autonomous multicellular components may facilitate non-equilibrium phases of chiral active matter.