The mechanism for the exclusion of sugars from the water in a model of the liveing cell: the ion-exchange resin: pore size or water structure?
The equilibrium distribution coefficients (p-value) of D-arabinose between the water in sulfonate ion-exchange resin and the external aqueous solution vary with the nature of the five alkali metal counterions studied. The strongest exclusion (lowest p-value) is found in the Li+ resin and the least exclusion (highest p-value) in the Cs+ resin. The p-value decreases with the increasing atomic weights for the alkali-metal ions: pCs+ greater than or equal to pRb+ greater than or equal to pRb+ greater than or equal to pK+ greater than pNa+ greater than pLi+. The water contents of these resins, on the other hand, vary in the opposite direction, being highest for the Li+ resin and lowest for the Cs+ resin. These data disprove the pore size theory but fully substantiate the predictions of the association-induction hypothesis.
D001089:Arabinose; D001665:Binding Sites; D001667:Binding, Competitive; D001692:Biological Transport; D002411:Cation Exchange Resins; D002414:Cations, Monovalent; D002586:Cesium; D007475:Ion Exchange Resins; D007700:Kinetics; D008094:Lithium; D008954:Models, Biological; D014867:Water
D002411:Cation Exchange Resins; D002414:Cations, Monovalent; D007475:Ion Exchange Resins; D014867:Water; D002586:Cesium; D008094:Lithium; D001089:Arabinose