Walz D, Caplan S R
Biozentrum, University of Basel, Switzerland.
Biophys J. 1995 Nov;69(5):1698-707. doi: 10.1016/S0006-3495(95)80039-1.
A minimal kinetic scheme for a system displaying sustained chemical oscillations is presented. The system is isothermal, and all steps in the scheme are kinetically reversible. The oscillations are analyzed and the crucial points elucidated. Both positive and negative feedback, if properly introduced, support oscillations, provided the state responsible for feedback is optimally buffered. It is shown that the requisite nonlinearity is introduced at the kinetic level because of feedback regulation and not, as is usually assumed, by large affinities that introduce nonlinearity at the thermodynamic level. Hence, sustained oscillations may occur near equilibrium.
提出了一个用于展示持续化学振荡系统的最小动力学方案。该系统是等温的,并且方案中的所有步骤在动力学上都是可逆的。对振荡进行了分析并阐明了关键点。如果适当地引入,正反馈和负反馈都能支持振荡,前提是负责反馈的状态得到最佳缓冲。结果表明,所需的非线性是在动力学层面由于反馈调节而引入的,而不是像通常所假设的那样,由在热力学层面引入非线性的大亲和力所导致。因此,持续振荡可能在接近平衡的状态下发生。