Journal ArticleDOI
Phospholipid Monolayer Density Distribution Perpendicular to the Water Surface. A Synchrotron X-Ray Reflectivity Study
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TLDR
In this paper, a simple model of the density with adjustable values for the densities and the projected lengths of the aliphatic tail and the polar head as well as an overall Gaussian smearing of densities is presented.Abstract:
Phospholipid monolayers at the air-water interface have been studied by synchrotron x-ray reflection methods. The range of momentum transfers (perpendicular to the surface) exceeded 2π/(layer thickness) thus yielding information about the density distribution across the layer. Data for a monolayer of L-α-dipalmitoylphosphatidylcholine (DPPC) in the solid phase (surface pressure 40 mN/m) are interpreted in terms of a simple model of the density with adjustable values for the densities and the projected lengths of the aliphatic tail and the polar head as well as an overall Gaussian smearing of the densities. We find that the tails are close-packed but uniformly tilted 30° relative to the interface normal.read more
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Journal ArticleDOI
Supported Membranes: Scientific and Practical Applications
TL;DR: Supporting lipid-protein bilayers form versatile models of low-dimensionality complex fluids, which can be used to study interfacial forces and wetting phenomena, and enable the design of phantom cells to explore the interplay of lock-and-key forces and universal forces for cell adhesion.
Journal ArticleDOI
Principles and applications of grazing incidence X-ray and neutron scattering from ordered molecular monolayers at the air-water interface
Jens Aage Als-Nielsen,D. Jacquemain,Kristian Kjaer,F. Leveiller,Meir Lahav,Leslie Leiserowitz +5 more
TL;DR: The use of surface-specific X-ray diffraction and fluorescence techniques has recently revolutionized the study of Langmuir monolayers at the air-liquid interface as mentioned in this paper.
Journal ArticleDOI
Some simple ideas on X-ray reflection and grazing-incidence diffraction from thin surfactant films
TL;DR: In this paper, a slide rule is used to evaluate the horizontal and vertical components of the scattering angle for Langmuir films of long linear amphiphilic molecules at the air-water interface.
Journal ArticleDOI
Lipid headgroup discrimination by antimicrobial peptide LL-37: insight into mechanism of action.
Frances Neville,Marjolaine Cahuzac,Oleg Konovalov,Yuji Ishitsuka,Ka Yee C. Lee,Ivan Kuzmenko,Girish M. Kale,David Gidalevitz +7 more
TL;DR: Grazing incidence x-ray diffraction demonstrated significant peptide insertion and lateral packing order disruption of the DPPG monolayer by LL-37 insertion, demonstrating its nonhemolytic activity and lipid discrimination.
References
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Intermolecular and surface forces
TL;DR: The forces between atoms and molecules are discussed in detail in this article, including the van der Waals forces between surfaces, and the forces between particles and surfaces, as well as their interactions with other forces.
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Ordering in lipid monolayers studied by synchrotron x-ray diffraction and fluorescence microscopy.
TL;DR: In this paper, x-ray diffraction results of phospholipid monolayers at an air/water interface are reported and compared with fluorescence microscopic observations of the fluid-gel lipid phase transition.
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Surface roughness of water measured by X-ray reflectivity
TL;DR: The roughness of the liquid-vapor interface for pure water was measured by a technique of x-ray reflectivity and a fit to the data by a theory with only one adjustable parameter obtains 3.2 \AA{}A for the root-mean-square roughs of the water surface.
Journal ArticleDOI
Smectic-A Order at the Surface of a Nematic Liquid Crystal: Synchrotron X-Ray Diffraction
TL;DR: In this paper, a large-diameter drop of octyloxycyanobiphenyl (8OCB) on a glass plate treated for homeotropic alignment yields perfect alignment of the smectic-$A$ layers at the top surface over an area of several square millimeters.