the effects of up to 20 mol % incorporation of all-trans-retinol ( vitamin a ) , retinal ( vitamin a aldehyde ) and retinoic acid ( vitamin a acid ) on acyl chain order and dynamics in liquid crystalline dipalmitoylphosphatidylcholine membranes at ph 7.5 were studied by electron spin resonance ( esr ) of 5- , 7- , 10- , 12- and 16-doxyl spin-labelled stearic acids intercalated into the membrane .
C0042839
vitamin a
C0040845
vitamin a acid