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arXiv 2604.01435cond-mat.softcond-mat.stat-mechq-bio.SC
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膜泡的渗透诱导形状变化

Osmotically Induced Shape Changes in Membrane Vesicles

Kansas State University(堪萨斯州立大学);NewOrbit Space Ltd(NewOrbit空间有限公司);University of Sheffield(谢菲尔德大学);Kaplan International College(凯伦国际学院);Université Paris-Saclay(巴黎萨克雷大学)

Rajiv G Pereira, Biswaroop Mukherjee, Sanjeev Gautam, Mattiangelo D'Agnese, Subhadip Biswas, Rachel Meeker, Buddhapriya Chakrabarti

AI总结:

研究通过自洽自由能框架探讨膜泡形状和渗透压的协同确定机制,揭示非线性耦合对球形膜稳定性条件的影响,提出新的临界压力预测方法。

摘要:

我们开发了一个自洽自由能框架,其中膜形状和渗透压在有限储库中同时确定,通过最小化弯曲弹性和溶质熵来实现。溶质守恒使渗透压成为热力学变量而非外加参数,产生膜力学与溶剂熵之间的非线性耦合。这种耦合修改了经典球形膜稳定性条件:不稳定性源于全局自由能竞争而非线性Helfrich稳定性准则。所得临界压力与Helfrich预测相差数量级,并与小和大单层膜泡的模拟结果一致。该框架适用于涉及生物分子凝聚物限制的细胞环境以及合成膜泡和渗透压驱动封装平台的发展。

英文摘要:

We develop a self-consistent free-energy framework in which membrane shape and osmotic pressure are determined simultaneously in a finite reservoir by minimizing bending elasticity and solute entropy. Solute conservation makes osmotic pressure a thermodynamic variable rather than an externally prescribed parameter, producing a nonlinear coupling between membrane mechanics and solvent entropy. This coupling modifies the classical stability condition for spherical vesicles: instability emerges from global free-energy competition rather than the linear Helfrich stability criterion. The resulting critical pressures differ by orders of magnitude from Helfrich predictions and agree with simulations for small and large unilamellar vesicles. The framework is relevant to cellular environments involving biomolecular condensate confinement as well as synthetic vesicles and the development of osmotic-pressure-driven encapsulation platforms.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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