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The pmr spectra of aqueous solutions of uracil, uridine, deoxyuridine, uridine 3'-monophosphate (3'-UMP), and uridine 5 '-monophosphate (5 '-UMP) have been studied as a function of electrolyte concentration. The addition of a "solvent-structure breaking" salt such as Mg(C104)2 or NaC104 to solutions of the nucleosides and nucleotides was found to result in significant upfield shifts of the uracil Hs resonance.

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Adsorption-desorption isotherms were obtained for water binding by 1,2-dimyristoylphosphatidylcholine in the temperature range 15 degrees-35 degrees C. The isotherms were analyzed by Brunauer et al.'s (BET) theory and also a polarization theory, the latter being more successful in fitting the data. There was some evidence for a change in the surface field of the lipid bilayer around 25 degrees C. Proton T1 and T2 measurements were used to obtain a log-normal molecular correlation time distribution for water protons in these systems. This distribution was compared with the isotherm data to effect a description of several classes of water molecules.

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