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(E,F) are reprinted with permission from Chakraborty et al [ The upright positioning of cholesterol along lipid tails induces tighter molecular packing or condensing of fluid phospholipid membranes, a phenomenon explained by the umbrella model whereby the phospholipid headgroups shield the non-polar cholesterol from unfavorable interactions with the aqueous medium [ 2 H-NMR [ 2 H-NMR studies on lipid membranes with varying degrees of chain unsaturation show an increase in quadrupolar splitting with increasing cholesterol content, indicating greater acyl chain ordering (see example in Figure 2C) [ 2 H-NMR studies and MD simulations [, obtained from Langmuir pressure area isotherms (see Figure 2D), illustrating the role of molecular interactions between lipids and cholesterol in determining the membrane structural properties [ values indicate stronger attractions between lipids and cholesterol
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Basel Switz., tom 19, nr 11, s
