Holographic interferometry of ultrasmall-pressure-induced curvature changes of bilayer lipid membranes

Picard, G.; Schneider-Henriquez, Juan E.; Fendler, János H.

doi:10.1021/j100365a005

Cited by 6 publications

(3 citation statements)

References 2 publications

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“…Credence to our methodology was provided by the excellent agreement between <n and (XL(calc) values at all measured SLM thicknesses. Similarly, it was gratifying to find that extrapolation of the SLM data to flat BLM and bulk GMO led to ctl values which were identical to those determined directly in earlier work.10, 18,19 It is important to recognize the difference between the present approach used for SLMs and that employed previously for BLMs. In our approach, all of the terms required for the elucidation of A<h> (ctl and 714) have been directly measured on the same SLM.…”

Section: Introductionsupporting

confidence: 55%

Surface forces in supported spherical lipid membranes

Schneider-Henriquez¹,

Denicourt²,

Fendler³

1992

Langmuir

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Section: Introductionsupporting

confidence: 55%

Surface forces in supported spherical lipid membranes

Schneider-Henriquez¹,

Denicourt²,

Fendler³

1992

Langmuir

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“…A torus would not have been present in the model membrane system described herein. With BLMs, membrane geometry can be monitored with high precision using a holographic interference technique (Picard et al 1990). By using static pressure to impose a membrane curvature and by observing the sum or the difference of the flexoelectric response and the "condenser microphone effect" (see Theoretical remarks), an unambiguous determination of the sign of f for a BLM can be made.…”

Section: Evaluation Of the Flexoelectric Coefficientmentioning

confidence: 99%

Flexoelectric effects in model and native membranes containing ion channels

et al. 1993

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An experimental study of flexoelectricity in model membranes containing ion pores and native membranes containing ion channels has been undertaken with the objective of determining the relationship, if any, between flexoelectricity and ion transport. Model membrane patches containing ion pores induced by a blue-green algal toxin, microcystin-LR, and locust muscle membrane patches containing potassium channels were studied using patch-clamp techniques. A correspondence was established between the presence of open channels and pores and the amplitude of the 1st harmonic of the total membrane current when the membranes or patches were subjected to pressure oscillations. The 2nd harmonic of the membrane current provided a measure of the amplitude of a membrane curvature induced by pressure, thus making it possible to determine the membrane flexoelectric coefficient. This study shows that flexoelectricity could be an effective driving force for ion transport through membrane pores and channels, thus further highlighting the possible biological significance of this mechano-electric phenomenon.

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“…The electron donor 1,2,3-trimethoxybenzene (TMB) has been used as reductive quencher for the excited state of the Rh(phen)2-(Me2bpy)3+ model complex (eq 12). The choice of this quencher *Rh(phen)2(Me2bpy)3+ + TMB Rh(phen)2(Me2bpy)2+ + TMB+ (12) (£1/2 = 1.42 V vs SCE in CH3CN) is based on previous knowledge of its behavior (diffusion-controlled quenching constant, high cage escape yield) in analogous experiments with Rh(phen)33+.26 In (19) Watts, R. J.; Van Houten, J. J. Am.…”

Section: Methodsmentioning

confidence: 99%

Intramolecular charge shift following bimolecular reductive quenching of a rhodium(III) polypyridine-diquat dyad

Indelli¹,

Polo²,

Bignozzi³

et al. 1991

J. Phys. Chem.

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The Rh(NN)$+-w+ dyad, which contains a Rh(II1) polypyridine moiety (Rh(NN)f+) and a N,N'-bridged diquatemarized 4,4'dimethyl-2,2'-bipyridine (p) as covalently linked components, has been synthesized and used in the study of intramolecular electron transfer. The study, performed by laser flash photolysis, makes use of a relatively unconventional reaction scheme. First, bimolecular electron-transfer quenching of the Rh(NN)t+-localized excited state of the dyad (using 1,2,3-trimethoxybenzene as external reductant) is used to generate the reduced dyad in the thermodynamically unfavored Rh(NN),"-w+ form. Then, this species is observed to relax by a fast (k = (3 f 1) X 10's-I) intercomponent charge-shift process to the stable (AGO, ca. 0.2 eV) Rh(NN)?+-DQ+ form. A slower bimolecular back-electron-transfer reaction with the radical cation of the external quencher (k = 3.3 X lo9 M-I s-l) finally brings back the dyad to its original oxidation state.

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Holographic interferometry of ultrasmall-pressure-induced curvature changes of bilayer lipid membranes

Cited by 6 publications

References 2 publications

Surface forces in supported spherical lipid membranes

Surface forces in supported spherical lipid membranes

Flexoelectric effects in model and native membranes containing ion channels

Intramolecular charge shift following bimolecular reductive quenching of a rhodium(III) polypyridine-diquat dyad

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