Sterols sense swelling in lipid bilayers

Дата и время публикации : 1998-12-24T00:22:34Z

Авторы публикации и институты :
F. Richter (TU Munich, EMBL Hamburg)
L. Finegold (Drexel)
G. Rapp (EMBL Hamburg)

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: 11 pages, 7 ps figures included, to appear in Phys.Rev.E
Первичная категория: cond-mat.soft

Все категории : cond-mat.soft

Краткий обзор статьи: In the mimetic membrane system of phosphatidylcholine bilayers, thickening (pre-critical behavior, anomalous swelling) of the bilayers is observed, in the vicinity of the main transition, which is non-linear with temperature. The sterols cholesterol and androsten are used as sensors in a time-resolved simultaneous small- and wide angle x-ray diffraction study to investigate the cause of the thickening. We observe precritical behavior in the pure lipid system, as well as with sterol concentrations less than 15%. To describe the precritical behavior we introduce a theory of precritical phenomena.The good temperature resolution of the data shows that a theory of the influence of fluctuations needs modification. The main cause of the critical behavior appears to be a changing hydration of the bilayer.

Category: Physics