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. Author manuscript; available in PMC: 2014 May 30.
Published in final edited form as: J Clin Exp Ophthalmol. 2014 Feb 21;5(1):326. doi: 10.4172/2155-9570.1000326

Figure 5.

Figure 5

Profiles of the oxygen diffusion-concentration product across the dimyristoylphosphatidylcholine membrane measured at 25°C in the absence (○) and presence (●) of 50 mol% cholesterol (A) and 10 mol% zeaxanthin (B). Measurements in (A) were done using saturation-recovery EPR approach with phospholipid-type spin labels. Measurements in (B) were done using line-broadening EPR approach with stearic acid spin labels (SASLs). Approximate locations of the nitroxide moieties of spin labels are indicated by arrows. The nitroxide attached to C16 may pass through the center of the bilayer and stay in the other leaflet of the membrane. Schematic drawings indicate relative positions of membrane modifiers (cholesterol and zeaxanthin) in the lipid bilayer. Figure was made based on data presented in [52] and [54].