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Mixtures of cholesterol with dimyristoyl phosphatidylserine or deuterated dimyristoyl phosphatidylserine were investigated by polarized and non polarized attenuated total reflection (ATR) Fourier transform infrared (FTIR) Spectroscopy. From polarized spectra the dichroic ratios of various vibrations as a function of cholesterol were calculated. Dichroic ratios of methylene vibration (CH 2 ...
About seven water molecules adhere to one molecule of dipalmitoylphosphatidyl serine (DPPS) in an oriented surface layer as inferred from the increase of the dichroic ratio R of their OH stretching vibration band (3400 cm -1 ) from 2 in the random bulk state to about 2.8 when adhering to DPPS. In DPPS-cholesterol mixtures the number of water molecules adhering to the phospholipid molecules...
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