By Emanuel Schneck

Systematic investigations of the constitution, mechanics, and dynamics of organic surfaces aid us comprehend extra approximately organic tactics happening at mobilephone and micro organism surfaces. offered here's a learn of the function membrane-bound saccharides play within the modulation of interactions among cells/bacteria and their environments. during this thesis, membrane constructions have been probed perpendicular and parallel to the skin, and complicated planar types of biomembranes composed of glycolipids of assorted structural complexities have been designed. additionally, specular and off-specular X-ray and neutron scattering experiments have been performed. This study has resulted in the improvement of a number of new tools for extracting details at the constitution and mechanics of saccharide-rendered biomembranes from the measured scattering signs. actually, extra is referred to now in regards to the impression of the saccharide constitution. those effects reveal that the learn of planar version platforms with X-ray and neutron scattering suggestions grants entire perception into the constitution and mechanics of complicated organic surfaces.

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Extra info for Generic and Specific Roles of Saccharides at Cell and Bacteria Surfaces: Revealed by Specular and Off-Specular X-Ray and Neutron Scattering (Springer Theses)

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Rev. E 63, 051709 (2001) 20. W. Helfrich, Steric interaction of fluid membranes in multilayer systems. Z. Naturforsch. 33a, 305 (1978) 21. W. Helfrich, Lyotropic lamellar phases. J. Phys. Condens. Matter 6, A79 (1994) 22. A. Parsegian, N. P. Rand, Measured work of deformation and repulsion of lecithin bilayers. Proc. Natl. Acad. Sci. USA 76, 2750 (1979) 23. D. M. Lifshitz, Statistische Physik Teil 1 (Akademie Verlag, Berlin, 1987) 24. H. Möhwald, in Structure and Dynamics of Membranes, ed. by R.

The scattering function can be expressed [34, 40, 42, 43] in terms of the height height correlation C(r) of the interface (see Sect. 2). In Kinematical approximation, the scattering function is given as: À Á e S qz ; qjj / q2z r2 q2z Z1 2 eqz C ð r Þ e iqjj r dr 1 The expression comprises a Fourier-transformation which has to be evaluated numerically in general. 17 (left) shows the calculated total (specular and diffuse) scattering intensity I(qz, q||) from a single topologically rough interface (q0 = 0, q1 = 20 9 10-6 Å-2) in color coded logarithmic scale.

11) can be calculated using the formalisms introduced by Parratt [34, 49]. Based on the Fresnel amplitude reflection coefficients,   z kjz À kjþ1 1 2 2 F Á exp À qz rj; jþ1 rj; jþ1 ¼ z z kj þ kjþ1 2 the effective amplitude reflection coefficient of the stratified system r0,N is calculated recursively starting from the last interface (between medium N - 1 and medium N): rN 1;N ¼ rNF 1;N z rj;N ¼ rj;F jþ1 þ rjþ1;N Á e2ikjþ1 djþ1 z 1 þ rj;F jþ1 Á rjþ1;N Á e2ikjþ1 djþ1 j counting downwards from N - 2 to 0, dj = zj+1 - zj denotes the thickness of medium j.

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