Abstract
Summary
The water content of pellets of a myelin extract of bovine optic nerve decreased with increasing salt concentration of the medium in which they were spun down. This water content was always less when Ca was the medium cation than when either equiequivalent Na or K was present. The pellet water cation concentration was always greater than that of the medium for the above 3 cation species. It is concluded that the extracted material carried a net negative charge. Extract Ca could not be completely exchanged by Li; Na, K, Rb, Cs, or Mg. At higher salt concentrations the ease of exchange of Ca by monovalent cations was in the same sequence as their hydrated diameters, the smallest counterions exchanging most readily.
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