生物离子交换树脂。II. 夸普水与离子交换选择性。
Biological ion exchanger resins. II. QUERP water and ion exchange selectivity.
作者信息
Damadian R, Goldsmith M, Zaner K S
出版信息
Biophys J. 1971 Sep;11(9):761-72. doi: 10.1016/S0006-3495(71)86252-5.
Abstract
Biological selectivity is shown to vary with medium osmotic strength and temperature. Selectivity reversals occur at 4 degrees C and at an external osmolality of 0.800 indicating that intracellular hydration and endosolvent (intracellular water) structure are important determinants in selectivity. Magnetic resonance measurements of line width by steady-state nuclear magnetic resonance (NMR) indicate a difference in the intracellular water signal of 16 Hz between the K form and Na form of Escherichia coli, providing additional evidence that changes in the ionic composition of cells are accompanied by changes in endosolvent structure. The changes were found to be consistent with the thermodynamic and magnetic resonance properties of aqueous electrolyte solutions. Calculation of the dependence of ion-pairing forces on medium dielectric reinforces the role of endosolvent structure in determining ion exchange selectivity.
摘要
生物选择性随介质渗透压强度和温度而变化。在4℃和外部渗透压为0.800时会发生选择性逆转，这表明细胞内水合作用和内溶剂（细胞内水）结构是选择性的重要决定因素。通过稳态核磁共振（NMR）对线宽进行的磁共振测量表明，大肠杆菌的K型和Na型细胞内水信号相差16Hz，这进一步证明细胞离子组成的变化伴随着内溶剂结构的变化。发现这些变化与水性电解质溶液的热力学和磁共振特性一致。离子对力对介质介电常数依赖性的计算强化了内溶剂结构在决定离子交换选择性方面的作用。
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