Critical Slowing Down in Lipid Bilayer Membrane Studied by a Differential Ultrasonic Resonator

Mitaku, Shigeki; Jippo, T.; Kataoka, Ryoichi; Date, Takeshi

doi:10.7567/jjaps.21s3.86

Cited by 4 publications

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“…The qualitative features of the results, the anomalous softening and slowing-down, lead to the conclusion that the gel-to-liquid crystal transition is accompanied by an increased fluctuation near the transition temperature, as discussed previously (9,13,20). A qualitative discussion may be outlined as follows.…”

Section: Discussionsupporting

confidence: 54%

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Thermodynamic properties of the lipid bilayer transition. Pseudocritical phenomena

Mitaku¹,

Jippo²,

Kataoka³

1983

Biophysical Journal

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Ultrasonic relaxation of multilamellar liposomes formed from dipalmitoylphosphatidylcholine was measured near the gel-to-liquid crystal transition by a differential ultrasonic resonator. The relaxation time and strength increased remarkably near the transition temperature, indicating a pseudocritical phenomenon. A quantitative analysis of the relaxation in terms of thermodynamic relationships between specific heat, thermal-expansion coefficient, and compressibility showed that more than 90% of the total endothermic heat of the transition arises from the latent heat. The temperature dependence of the ultrasonic relaxation parameters was also analyzed by the Landau theory; we obtain a small but finite difference, 0.6 degree C, between the pseudocritical temperature and the transition temperature. These results provide a quantitative description of both the first-order and second-order characters of the gel-to-liquid crystal transition.

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Section: Discussionsupporting

confidence: 54%

“…The high accuracy was realized by the least square analysis of ultrasonic resonance curves as follows. The output voltage, U, from the receiving transducer is related to the frequency,f (20,21),…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic properties of the lipid bilayer transition. Pseudocritical phenomena

Mitaku¹,

Jippo²,

Kataoka³

1983

Biophysical Journal

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Ultrasonic studies of membrane suspensions

Mitaku¹,

Kataoka²,

Aruga³

et al. 1984

Il Nuovo Cimento D

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Quasielastic Light-Scattering Study on Changes in Sizes of Native White Membranes after Addition of Retinal

Marque¹,

Ikegami²,

Kubota³

et al. 1986

Biophysical Journal

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Aqueous suspensions of native white membranes from Halobacterium halobium, strain JW2N, have been studied by quasielastic light scattering. The intensity autocorrelation functions of polarized scattered light from suspensions of white membranes themselves and of white membranes after reconstitution with retinal were measured at various K(2), K being the magnitude of the scattering vector. The first cumulant or the average decay rate of the correlation function was obtained by a cumulant expansion method. The first cumulant for the white membranes increased after retinal was added to the suspension. The first cumulants obtained before and after the addition of retinal were almost independent of pH in the range 7 to 11, and of temperature in the range 15 degrees to 40 degrees C after T/eta scaling, eta being the solvent viscosity. This suggests that photocycling in reconstituted membranes, induced by the probe laser-beam, did not cause any detectable change in spectra, and that the membrane flexibility, if present, was independent of the above conditions, so that the spectral changes after the addition of retinal could be attributed mostly to the changes in the sizes of the membranes. A theoretical formulation for the first cumulant for a rigid disk-like scatterer (Fujime, S. and K. Kubota, 1985, Biophys. Chem., 23:1-13.) was applied to the analysis of the spectra. The results suggest that the radii of the membrane patches decreased by several percent after the addition of retinal.

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Critical Slowing Down in Lipid Bilayer Membrane Studied by a Differential Ultrasonic Resonator

Cited by 4 publications

References 0 publications

Thermodynamic properties of the lipid bilayer transition. Pseudocritical phenomena

Thermodynamic properties of the lipid bilayer transition. Pseudocritical phenomena

Ultrasonic studies of membrane suspensions

Quasielastic Light-Scattering Study on Changes in Sizes of Native White Membranes after Addition of Retinal

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