A coculture of Syntrophobacter fumaroxidans and Methanospirillum hungatei was modeled using four biokinetic models, which only differed by the functions used to describe the growth yields (dynamic or constant) and the hydrogen inhibition function (noncompetitive or based on thermodynamics). First, a batch experiment was used to train the model and analyze the fitted parameters. Two fitting procedures were followed by minimizing the error on different indicators. Second, a chemostat experiment was used as a test data set to assess the predictive power of the models. Overall, the four models were able to accurately fit the train data set following both fitting procedures. However, some parameters fitted with the ADM1-like model differed significantly from values reported in the literature and were dependent on the fitting procedure. When applied to the test data set it systematically resulted in positive Gibbs free energy changes values for propionate oxidation, in contradiction with the second law of thermodynamics. On the opposite, the parameters fitted with model including both a thermodynamic-based inhibition function and a dynamic computation of growth yields were more consistent with values reported in the literature and repeatable whatever the fitting procedure. The results highlight the potential of implementing thermodynamic-based functions in biokinetic models.

中文翻译：

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使用热力学原理模拟丙酸氧化共养共培养

Syntrophobacter fumaroxidans和Methanospirillum hangatei的共培养使用四种生物动力学模型进行建模，其不同之处仅在于用于描述生长产量（动态或恒定）的函数和氢抑制函数（非竞争性或基于热力学）。首先，使用批量实验来训练模型并分析拟合参数。通过最小化不同指标的误差，遵循两个拟合程序。其次，使用恒化器实验作为测试数据集来评估模型的预测能力。总体而言，这四个模型能够按照两个拟合程序准确拟合训练数据集。然而，与 ADM1 样模型拟合的一些参数与文献中报道的值显着不同，并且取决于拟合程序。当应用于测试数据集时，它系统地导致丙酸盐氧化的吉布斯自由能变化值为正，这与热力学第二定律相矛盾。相反，与包括基于热力学的抑制函数和生长产量的动态计算在内的模型拟合的参数与文献中报道的值更一致，并且无论采用何种拟合程序都是可重复的。结果突出了在生物动力学模型中实现基于热力学的功能的潜力。拟合模型的参数包括基于热力学的抑制函数和生长产量的动态计算与文献中报道的值更一致，并且无论拟合程序如何都是可重复的。结果突出了在生物动力学模型中实现基于热力学的功能的潜力。拟合模型的参数包括基于热力学的抑制函数和生长产量的动态计算与文献中报道的值更一致，并且无论拟合程序如何都是可重复的。结果突出了在生物动力学模型中实现基于热力学的功能的潜力。