Bauer Wolfgang R, Nadler Walter
Department of Internal Medicine I, University Hospital of Würzburg, Oberdürrbacher Strasse 6, D-97080 Würzburg, Germany.
Phys Rev E Stat Nonlin Soft Matter Phys. 2013 Jul;88(1):010703. doi: 10.1103/PhysRevE.88.010703. Epub 2013 Jul 8.
Channel transport of different species of particles is viewed usually only in terms of competition and selectivity. In this paper we show that transport of one species may be promoted by the presence of another and that both may even mutually cooperate. We investigate a discretized Markovian model of nanochannel transport via in-channel sites, allowing for the simultaneous transport of several different species of particles; interaction between transported particles is included via the condition of single occupancy on a channel site. By numerically solving the model exactly, particularly an analysis of situations of crowding in the channel is possible and we observe three situations: mutual cooperation, promotion of one species at the cost of the other, and mutual competition. The physical situation has a strong nonequilibrium character as Onsager's relations on coupled flows do not hold.
通常，不同种类粒子的通道传输仅从竞争和选择性的角度来看待。在本文中，我们表明一种粒子的传输可能会因另一种粒子的存在而得到促进，甚至两者可能相互协作。我们研究了通过通道内位点进行纳米通道传输的离散马尔可夫模型，该模型允许几种不同种类的粒子同时传输；通过通道位点上单占据条件来纳入被传输粒子之间的相互作用。通过精确地对模型进行数值求解，尤其能够对通道拥挤情况进行分析，我们观察到三种情况：相互协作、以牺牲另一种粒子为代价促进一种粒子传输以及相互竞争。由于耦合流的昂萨格关系不成立，这种物理情况具有很强的非平衡特性。
