Serra Roberto, Villani Marco
Department of Physics, Informatics and Mathematics, Modena and Reggio Emilia University via Campi 213a, 41125 Modena, Italy.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Jun;87(6):062814. doi: 10.1103/PhysRevE.87.062814. Epub 2013 Jun 20.
We describe and theoretically analyze here a phenomenon which can take place in a system with two different compartments, each containing the same chemicals, which undergo reactions on the surface of both sides of the membrane which separates the two compartments, in the case where the membrane permeabilities to the various chemicals are different and diffusion is fast. There are two main reasons of interest for this kind of system. First, if the overall system is isolated, starting from the case where the initial concentrations of the chemicals are the same in the two phases, one observes the formation of a transient concentration difference. This difference eventually vanishes, although it might last for a long time, depending upon the value of the relevant parameters. The second reason of interest is that, in the case of an open system, one can achieve a steady-state value of the concentration of some chemicals in the smaller compartment which is higher than that in the external one. These results may prove important, inter alia, to understand the behavior of lipid vesicles in water, a topic which is important for studies on the origin of life as well as for possible future applications.
我们在此描述并从理论上分析一种现象，该现象可能发生在具有两个不同隔室的系统中，每个隔室都含有相同的化学物质，这些化学物质在分隔两个隔室的膜的两侧表面发生反应，条件是膜对各种化学物质的渗透率不同且扩散很快。对于这种系统，有两个主要的研究兴趣点。首先，如果整个系统是孤立的，从两个相中化学物质的初始浓度相同的情况开始，会观察到瞬态浓度差的形成。尽管这个差异可能会持续很长时间，具体取决于相关参数的值，但最终它会消失。第二个研究兴趣点是，在开放系统的情况下，可以在较小隔室中实现某些化学物质的浓度稳态值，该值高于外部隔室中的浓度。这些结果可能尤其对理解水中脂质囊泡的行为很重要，这一主题对于生命起源的研究以及未来可能的应用都很重要。
