Liquid-crystalline collapse of pulmonary surfactant monolayers.
Liquid-crystalline collapse of pulmonary surfactant monolayers.
复制标题
肺表面活性剂单层的液晶塌陷。
DOI:
10.1016/s0006-3495(03)75107-8
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发表时间:
2003
影响因子:
3.4
通讯作者:
Vogel,Viola
中科院分区:
文献类型:
--
作者:
Schief,WilliamR;Antia,Meher;Discher,BohdanaM;Hall,StephenB;Vogel,Viola
During exhalation, the surfactant film of lipids and proteins that coats the alveoli in the lung is compressed to high surface pressures, and can remain metastable for prolonged periods at pressures approaching 70mN/m. Monolayers of calf lung surfactant extract (CLSE), however, collapse in vitro, during an initial compression at ∼45mN/m. To gain information on the source of this discrepancy, we investigated how monolayers of CLSE collapse from the interface. Observations with fluorescence, Brewster angle, and light scattering microscopies show that monolayers containing CLSE, CLSE-cholesterol (20%), or binary mixtures of dipalmitoyl phosphatidylcholine(DPPC)-dihydrocholesterol all form bilayer disks that reside above the monolayer. Upon compression and expansion, lipids flow continuously from the monolayer into the disks, and vice versa. In several respects, the mode of collapse resembles the behavior of other amphiphiles that form smectic liquid-crystal phases. These findings suggest that components of surfactent films must collapse collectively rather than being squeezed out individually.
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影响因子:
3.4
作者:
L. D. Worthman;K. Nag;Philip J. Davis;K. Keough
通讯作者:
K. Keough
影响因子:
3.9
作者:
DEMUL, MNG;MANN, JA
通讯作者:
MANN, JA
影响因子:
3.9
作者:
de Mul, MNG;Mann, JA
通讯作者:
Mann, JA
DOI:
10.1021/j100162a052
发表时间:
1991
期刊:
The Journal of Physical Chemistry
影响因子:
--
作者:
D. Vollhardt;U. Retter
通讯作者:
U. Retter
DOI:
10.1016/s0927-7757(99)00555-5
发表时间:
2000
期刊:
Colloids and Surfaces A: Physicochemical and Engineering Aspects
影响因子:
--
作者:
J. Meunier
通讯作者:
J. Meunier