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Gewählte Publikation:

Hianik, T., Küpcü, S., Sleytr, U. B., Rybár, P., Krivánek, R., Kaatze, U..
(1999): Interaction of crystalline bacterial cell surface proteins with lipid bilayers in liposomes. A sound velocity study.
Colloids and Surfaces A, 147, 331-339

Sound velocity and density measurements have been used to study physical properties of plain unilamellar liposomes and covered by a crystalline cell surface layer (S-layer) of Bacillus coagulans, strain E38-66. The liposomes were composed of dipalmitoylphosphatidylcholine (DPPC), cholesterol and hexadecylamine. The measured parameters - velocity number [u] and density rho - decrease with increasing temperature for both suspensions of liposomes with S-layers (S-DPPC) and without S-layers. The values of [u] at T< 29 degrees C are smaller, and at T > 29 degrees C larger for S-DPPC than those of plain liposomes. The density of the S-DPPC system was slightly greater than those of plain bilayer suspensions. The specific adiabatic compressibility, phi(k)/beta(o), calculated from the values of [u] and of the specific volume, phi(k), increases with temperature for both liposome systems. The comparison of the parameter phi(k)/beta(0) for S-DPPC and DPPC indicates that the adiabatic compressibility of S-DPPC at T< 20 degrees C was higher and at T > 20 degrees C was lower in comparison with that of plain DPPC. This is evidence of an interesting phenomenon of softening and condensing effects of S-proteins on the lipid bilayer depending on the temperature. (C) 1999 Elsevier Science B.V. All rights reserved.
Autor*innen der BOKU Wien:
Küpcü Seta
Sleytr Uwe B.
BOKU Gendermonitor:

Find related publications in this database (Keywords)
crystalline bacterial surface layers
velocity of ultrasound
adiabatic compressibility

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