活性离子输运的热力学模型
A Thermodynamic Model for Active Ion Transport
摘要：
离子的主动转运对维持细胞内、外环境的正常运转至关重要。已知腺苷5 '-三磷酸（ATP）是一种通用的能量源，其为泵施加键能以克服离子浓度梯度。在这项研究中，我们介绍了一种新的热力学模型的主动离子传输，它允许泵作为一个“麦克斯韦的恶魔”，也符合热力学第二定律。逆梯度输运是由ATP流中记录信息的热力学涨落引起的。此外，本文还对红细胞血影系统中Na-K ATP酶的实验结果进行了详尽的分析和验证，所有的实验结果都支持了恶魔泵工作机理的可解性理论。我们的研究结果表明ATP可能是一种信息载体，而不是能量货币。高能磷酸键可以提高与离子传输相关的信息记录效率，并且可以主要转化为热。
英文摘要：
Active ion transport is very critical for living cells to maintain and regular internal and external environment. It is known that adenosine 5'-triphosphate (ATP) is a general energy source that applies bond energy for pumps to overcome ion concentration gradient. In this study, we introduce a novel thermodynamic model for active ion transport, which allows the pump to act as a 'Maxwell's demon', and also conforms to the second law of thermodynamics. Transport against the gradient is caused by the thermodynamic fluctuation with information recording in ATP stream. Besides, exhaustive experiments about Na-K ATPase performed in the red cell ghost system are reviewed to verify this model, and all the results can support the solvable theory about the working mechanism of demon pumps. Our findings indicate the possible role of ATP as an information carrier but not energy currency. The high-energy phosphate bonds can improve the efficiency of information recording in relevance to ion transport and may mainly convert to heat.
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