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Phosphatidylserine and cholesterol are two major components of the cytoplasmic leaflet of the plasma membrane. The arrangement of cholesterol is markedly affected by the presence of phosphatidylserine in model membranes. At relatively low mol fractions of cholesterol in phosphatidylserine, compared with other phospholipids, cholesterol crystallites are formed that exhibit both thermotropic phase transitions...
There is a marked hysteresis between the heating and cooling polymorphic phase transition of anhydrous cholesterol. At a scan rate of 0.05°C/min the difference in transition temperatures between heating and cooling scans is ∼10°C. This phenomenon also occurs with mixtures of cholesterol with phosphatidylserine and can result in an underestimation of the amount of crystalline cholesterol in a sample...
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