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  • Swelling  (1)
  • acyl chain ordering  (1)
  • 1
    Electronic Resource
    Electronic Resource
    The effects of acyl chain ordering and crystallization on the main phase transition of wet lipid bilayers (1987)
    Springer
    European biophysics journal 15 (1987), S. 77-86 
    Details
    ISSN: 1432-1017
    Keywords: Lipid bilayer ; acyl chain ordering ; crystallization ; grain-boundary formation ; interfacial melting
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract The main gel-fluid phase transition of wet lipid bilayers is examined in terms of a microscopic interaction model which incorporates both trans-gauche isomerism of the lipid acyl chains and crystal orientation variables for the lipid molecules. The model gives two scenarios for the phase behavior of wet lipid bilayers in terms of temperature: (i) chain melting occurs at a higher temperature than crystallization, or (ii) chain melting and crystallization occur at the same temperature. Experimental data for lipid bilayers is consistent with the second scenario. In this case, computer simulation is used to investigate the non-equilibrium behaviour of the model. The numerical data is intepreted in terms of interfacial melting on heating and grain formation on cooling through the main phase transition. Interfacial melting is a non-equilibrium process in which the grains of a polycrystalline bilayer melt inwards from the boundaries. The prediction of interfacial melting in wet lipid bilayers is examined in relation to data from both equilibrium and nonequilibrium measurements, to corresponding phase behavior in monolayers, and to previous theoretical work.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257501
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  • 2
    Electronic Resource
    Electronic Resource
    Solutes in small amounts provide for lipid-bilayer softness: cholesterol, short-chain lipids, and bola lipids (1996)
    Springer
    European biophysics journal 25 (1996), S. 61-65 
    Details
    ISSN: 1432-1017
    Keywords: Key words Lipid bilayer ; Softness ; Swelling ; Cholesterol ; Short-chain lipid ; Bola lipid ; Small-angle neutron scattering ; Calorimetry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Physics
    Notes: Abstract The effect of the incorporation of small amounts (∼1 mole%) of amphiphilic solutes, such as cholesterol, a short-chain lipid (DC10PC), and a bola lipid, into multilamellar DMPC bilayers is studied by small-angle neutron scattering and differential-scanning calorimetry. The anomalous swelling behavior observed in the transition region of pure DMPC bilayers is interpreted as an indication of bilayer softening and thermally reduced bending rigidity. Small amounts of the solutes are found to maintain or even enhance the bilayer softness. In the case of cholesterol, a systematic study shows that the well-known rigidification effect is observed only for cholesterol concentrations above 3–4 mole%. The results are discussed in relation to the physical properties of internal cell membranes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002490050018
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