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首页> 外文期刊>The FEBS journal >Optimal observability of sustained stochastic competitive inhibition oscillations at organellar volumes
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Optimal observability of sustained stochastic competitive inhibition oscillations at organellar volumes

机译:在细胞器体积上持续随机竞争抑制振荡的最佳可观察性

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摘要

When molecules are present in small numbers, such as is frequently the case in cells, the usual assumptions leading to differential rate equations are invalid and it is necessary to use a stochastic description which takes into account the randomness of reactive encounters in solution. We display a very simple biochemical model, ordinary competitive inhibition with substrate inflow, which is only capable of damped oscillations in the deterministic mass-action rate equation limit, but which displays sustained oscillations in stochastic simulations. We define an observability parameter, which is essentially just the ratio of the amplitude of the oscillations to the mean value of the concentration. A maximum in the observability is seen as the volume is varied, a phenomenon we name system-size observability resonance by analogy with other types of stochastic resonance. For the parameters of this study, the maximum in the observability occurs at volumes similar to those of bacterial cells or of eukaryotic organelles.
机译:当分子以少量存在时(例如细胞中的常见情况),导致差分速率方程的通常假设是无效的,因此有必要使用一种随机描述,其中考虑了溶液中反应性相遇的随机性。我们显示了一个非常简单的生化模型,即具有底物流入的普通竞争性抑制作用,该模型仅能够抑制确定性质量作用速率方程极限中的振荡,但在随机模拟中显示出持续的振荡。我们定义了一个可观察性参数,它实际上只是振荡幅度与浓度平均值的比值。随着体积的变化,可观察性达到最大值,这是我们将其称为系统大小可观察性共振的现象,类似于其他类型的随机共振。对于这项研究的参数,可观察性的最大值出现在与细菌细胞或真核细胞器相似的体积上。

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