Complex Systems and Statistical Mechanics, Department of Physics and Materials Science, University of Luxembourg, L-1511 Luxembourg City, Luxembourg.
J Chem Phys. 2022 Jan 7;156(1):014116. doi: 10.1063/5.0076134.
We investigate the thermodynamic implications of two control mechanisms of open chemical reaction networks. The first controls the concentrations of the species that are exchanged with the surroundings, while the other controls the exchange fluxes. We show that the two mechanisms can be mapped one into the other and that the thermodynamic theories usually developed in the framework of concentration control can be applied to flux control as well. This implies that the thermodynamic potential and the fundamental forces driving chemical reaction networks out of equilibrium can be identified in the same way for both mechanisms. By analyzing the dynamics and thermodynamics of a simple enzymatic model, we also show that while the two mechanisms are equivalent at steady state, the flux control may lead to fundamentally different regimes where systems achieve stationary growth.
我们研究了两种控制开放化学反应网络的热力学含义。第一种控制与环境交换的物质的浓度，而另一种控制交换通量。我们表明，这两种机制可以相互映射，并且通常在浓度控制框架下发展的热力学理论也可以应用于通量控制。这意味着对于这两种机制，可以以相同的方式确定热力学势和推动化学反应网络远离平衡的基本力。通过分析简单酶模型的动力学和热力学，我们还表明，虽然两种机制在稳态时等效，但通量控制可能导致系统实现稳定生长的根本不同的状态。
