Berlin 2008 – wissenschaftliches Programm
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BP: Fachverband Biologische Physik
BP 9: Membranes and Interfaces
BP 9.4: Vortrag
Dienstag, 26. Februar 2008, 11:15–11:30, PC 203
Specular and Off-Specular Neutron Scattering from Solid-Supported Glycolipid Membrane Multilayers — •Emanuel Schneck1, Florian Rehfeldt2, Bruno Demé3, Christian Gege4, Richard Schmidt4, and Motomu Tanaka1 — 1Physikalisch-Chemisches Institut, Universität Heidelberg, INF 253, 69120 Heidelberg, Germany — 2Lehrstuhl für Biophysik E22, Technische Universität München, D-85748 Garching, Germany — 3Institut Laue-Langevin, B.P. 156, F-38042 Grenoble Cedex 9, France — 4Fachbereich Chemie, Universität Konstanz, Fach M 725, D-78457 Konstanz, Germany
Solid-supported glycolipid membrane multilayers, acting as well-defined model systems for the study of saccharide-mediated inter-membrane interactions, were studied by specular and off-specular neutron scattering. Experiments were carried out at controlled temperatures and humidities, as well as under bulk water using a self-developed liquid cell. Force-distance relationships were recorded by measuring at various osmotic pressures. Mechanical properties of the studied membranes (i.e. bending moduli and inter-membrane compression moduli) were extracted by comparing scattering signals to reciprocal space maps simulated in the framework of smectic crystal theory. The results demonstrate that distinct variations in the oligosaccharide headgroup structures of the glycolipid molecules can result in significant changes in bending modulus and inter-membrane interactions.