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Qi L, Bi Z. Adsorption kinetics investigation for alkyltrimethylammonium bromides on ITO-aqueous interface. COLLOID JOURNAL 2011. [DOI: 10.1134/s1061933x08020099] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Dyachok O, Zhabyeyev P, McDonald TF. Electroporation-induced inward current in voltage-clamped guinea pig ventricular myocytes. J Membr Biol 2010; 238:69-80. [PMID: 21104181 DOI: 10.1007/s00232-010-9320-z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2010] [Accepted: 10/29/2010] [Indexed: 01/29/2023]
Abstract
Electroporation induced by high-strength electrical fields has long been used to investigate membrane properties and facilitate transmembrane delivery of molecules and genes for research and clinical purposes. In the heart, electric field-induced passage of ions through electropores is a factor in defibrillation and postshock dysfunction. Voltage-clamp pulses can also induce electroporation, as exemplified by findings in earlier studies on rabbit ventricular myocytes: Long hyperpolarizations to ≤-110 mV induced influx of marker ethidium and irregular inward currents that were as large with external NMDG(+) as Na(+). In the present study, guinea pig ventricular myocytes were bathed with NMDG(+), Na(+) or NMDG(+) + La(3+) solution (36°C) and treated with five channel blockers. Hyperpolarization of myocytes in NMDG(+) solution elicited an irregular inward current (I (ep)) that reversed at -21.5 ± 1.5 mV. In myocytes hyperpolarized with 200-ms steps every 30 s, I (ep) occurred in "episodes" that lasted for one to four steps. Boltzmann fits to data on the incidence of I (ep) per experiment indicate 50% incidence at -129.7 ± 1.4 mV (Na(+)) and -146.3 ± 1.6 mV (NMDG(+)) (slopes ≈-7.5 mV). I (ep) amplitude increased with negative voltage and was larger with Na(+) than NMDG(+) (e.g., -2.83 ± 0.34 vs. -1.40 ± 0.22 nA at -190 mV). La(3+) (0.2 mM) shortened episodes, shifted 50% incidence by -35 mV and decreased amplitude, suggesting that it inhibits opening/promotes closing of electropores. We compare our findings with earlier ones, especially in regard to electropore selectivity. In the Appendix, relative permeabilities and modified excluded-area theory are used to derive estimates of electropore diameters consistent with reversal potential -21.5 mV.
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Affiliation(s)
- Oksana Dyachok
- Department of Physiology and Biophysics, Dalhousie University, Halifax, NS, B3H 1X5, Canada
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Edwards MA, Martin S, Whitworth AL, Macpherson JV, Unwin PR. Scanning electrochemical microscopy: principles and applications to biophysical systems. Physiol Meas 2006; 27:R63-108. [PMID: 17135697 DOI: 10.1088/0967-3334/27/12/r01] [Citation(s) in RCA: 95] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
This review highlights numerous and wide ranging biophysical and biochemical applications of scanning electrochemical microscopy (SECM). SECM instrumentation and theoretical modelling, necessary for experimental interpretation, are outlined, followed by a detailed discussion of the diverse applications of this technique. These include the measurement of flow through membranes, the determination of kinetic parameters of reactions, the investigation of the permeability of small molecules in tissues and monitoring biological processes, such as the production of oxygen or nitric oxide by cells. The significant impact of micro-electrochemical techniques on our understanding of basic physicochemical processes at biologically relevant interfaces is also considered. Studies reviewed include transport across and within bilayers and monolayers. Recent advances in SECM include the combination of SECM with other techniques, such as atomic force microscopy and optical microscopy. These developments are highlighted, along with prospects for the future.
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Affiliation(s)
- Martin A Edwards
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
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Qi L, Liao W, Bi Z. Adsorption investigation of two surfactants at solid/aqueous interface by a cyclic voltammetry method. Colloids Surf A Physicochem Eng Asp 2005. [DOI: 10.1016/j.colsurfa.2004.10.089] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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5
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Shirai O, Yoshida Y, Matsui M, Maeda K, Kihara S. Voltammetric Study on the Transport of Ions of Various Hydrophobicity Types through Bilayer Lipid Membranes Composed of Various Lipids. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 1996. [DOI: 10.1246/bcsj.69.3151] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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6
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Effect of taste substances on electric characteristics of a lipid cast membrane with a single pore. ACTA ACUST UNITED AC 1989. [DOI: 10.1016/0250-6874(89)80003-4] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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7
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Smith J, Coster H, Laver D. The dependence of the conductance of phosphatidylcholine bilayers upon the concentration and composition of the external electrolyte. BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES 1985. [DOI: 10.1016/0005-2736(85)90537-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Effect of discrete charges on membrane conductance and stability in electrical fields. ACTA ACUST UNITED AC 1983. [DOI: 10.1016/0302-4598(83)80096-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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10
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Effect of discrete charges on membrane conductance and stability in electrical fields. J Electroanal Chem (Lausanne) 1983. [DOI: 10.1016/s0022-0728(83)80671-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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11
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12
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Criteria for the Reconstitution of Ion Transport Systems. ACTA ACUST UNITED AC 1980. [DOI: 10.1016/s0070-2161(08)60115-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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Abstract
The effects of continuous wave ultrasound at a frequency of 1 MHz in the intensity range of 0-1.4 W/cm2 on an oxidized cholesterol bilayer lipid membrane (BLM) were observed. Ultrasound at 1.5 W/cm2 broke the membrane; in the range from 0.5 to 1.4 W/cm2, it accelerated the draining of the bulk lipid solution from the annulus to the Teflon support. At all intensities it has no effect on the conductance, the capacitance, or the dependence of each on the voltage applied across the membrane. Electrical parameters were measured in the presence of aqueous solutions of NaCl, KCl, and distilled water. The motivation and results of this project are explained in relation to an overall objective of determining the specific effects of ultrasound on biological membranes.
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Zimmermann U, Beckers F, Coster HG. The effect of pressure on the electrical breakdown in the membranes of Valonia utricularis. BIOCHIMICA ET BIOPHYSICA ACTA 1977; 464:399-46. [PMID: 831801 DOI: 10.1016/0005-2736(77)90014-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The interpretation of electrical breakdown in terms of electro-mechanical instabilities, predicts that the breakdown potential should decrease with increasing cell turgor pressure. Experiments were conducted to test this hypothesis on cells of Valonia utricularis over a turgor pressure range of 0.5-10(5)-5.0-10(5) N/m2. Electrical breakdown was measured using intracellular electrodes and 500 mus current pulses. The pressure was monitored by an intracellular micropipette pressure transducer. The results obtained show a linear decrease in the critical breakdown potential with pressure. The effective compressive modulus of the cell membrane, gamma, is calculated from the slope of this line to 69+/-10-10(5) N/m2 (average value of seven measurements). This is consistent with the theoretical prediction of the electromechanical model using our previously determined values of the elastic modulus of the membrane. A theoretical analysis is given of the effects of pressure on the breakdown, This includes also considerations of the indirect effect of pressure on the membrane via stretching of the cell wall with a possible coupling of such strains to the cell membrane. The results and analysis presented allow us to conclude on the basis of the experimentally determined breakdown P.K. of 959 mV that the region of membrane where electrical breakdown occurs is a dielectric with one of the following combinations of parameters: (A) a thickness delta=7-9 nm with a dielectric constant epsilon=greater than 10, e.g. a hydrated protein spanning the whole membrane. (B) delta=4-5 nm with epsilon=3-8, e.g. a lipoprotein of lipid bilayer dimensions. (C) delta approximately 2 nm with epsilon=2-3, e.g. a half lipid bilayer. If we assume that the breakdown P.D. of the tonoplast and plasmalemma are identical, that is 480 mV, then there is only one reasonable choice for the membrane thickness and the dielectric constant: delta=2 nm, epsilon=3-8, e.g. a (lipo) proteinaceous module facing a half life lipid bilayer.
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Coster HG, Simmermann U. The mechanism of electrical breakdown in the membranes of Valonai utricularis. J Membr Biol 1975; 22:73-90. [PMID: 1127686 DOI: 10.1007/bf01868164] [Citation(s) in RCA: 177] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The dielectric breakdown in the membranes of cells of Valonia utricularis was investigated using intracellular electrodes and 500 mu sec current pulses. Electrical breakdown, which occurs when the membrane potential reaches a well-defined critical value, is not associated with global damage to the cell or its membranes (the membrane reseals in smaller than 5 sec). It was thus possible to investigate the effect of temperature on dielectric breakdown in single cells. It was found that the critical potential for breakdown was strongly dependent on temperature, decreasing from similar to 100 mV at 4 degrees C to similar to 640 mV at 30 degrees C. The decrease in the breakdown potential with increasing temperature and the very short rise-time of the breakdown current (similar to 1mu sec) suggests that the Wien field dissociation does not play a major role in the breakdown process. It is shown that the nonlinear I-V characteristics observed at different temperatures can be accurately accounted for with no adjustable parameters, by considerations of the mechanical compression of the membrane due to stresses induced by the electric field. Electrical breakdown on this scheme results from an electromechanical instability in the membrane. On this basis the present results indicate that the elastic modulus of the region of the membrane where breakdown occurs, decreases by a factor of 2 with increasing temperature from 4 to 30 degrees C. On the assumption of a thickness of 4.0 nm and a dielectric constant of 5, the elastic modulus is estimated to have a value of 5 times 10-6Nm- minus 2 at 20 degrees C.
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Requena J, Haydon D. The lippmann equation and the characterization of black lipid films. J Colloid Interface Sci 1975. [DOI: 10.1016/0021-9797(75)90119-8] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Wei LY, Woo BY. Semiconductor theory of ion transport in thin lipid membranes. I. Potential and field distributions. Bull Math Biol 1974; 36:229-46. [PMID: 4418425 DOI: 10.1007/bf02461326] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Abstract
The bimolecular lipid membrane (BLM) is modeled as a bulk elastic layer subject to a compressive electric force caused by applied voltages. Analysis of this model shows that a compressive instability develops when the electric stress exceeds a critical value. This instability tends to crush the film and thus rupture it. The predicted breakdown voltage, when compared with measured values for phosphatidylcholine and cholesterol, shows fair agreement, considering the uncertainty in the estimate of elastic parameters.
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Torch WC, Abood LG. Effect of calcium, sodium, and aluminum ions on electrical and physical properties of bimolecular lipid membranes. Int J Neurosci 1973; 5:143-51. [PMID: 4724246 DOI: 10.3109/00207457309149466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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22
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Sweeney GD, Blank M. Some electrical properties of thin lipid films formed from cholesterol and cetyltrimethylammonium bromide. J Colloid Interface Sci 1973. [DOI: 10.1016/0021-9797(73)90306-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Montal M. Lipid-polypeptide interactions in bilayer lipid membranes. J Membr Biol 1972; 7:245-66. [PMID: 24177509 DOI: 10.1007/bf01867918] [Citation(s) in RCA: 34] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/1971] [Indexed: 10/25/2022]
Abstract
The modifications of the electrical properties of bilayer lipid membranes (BLM) composed of cholesterol and an ionic surfactant upon interaction with charged polypeptides were studied. The addition of 10(-8) M polylysine (Ps(+)) to one side of anionic cholesterol dodecylphosphate BLM increases the specific membrane conductance over 1000-fold (from 10(-8) to 10(-5) mho/cm(2)) and develops a cationic transmembrane potential larger than 50 mV. This potential is reverted by addition of polyanions such as RNA, polyglutamic or polyadenilic acid to the same side on which Ps(+) is present, by addition of Ps(+) to the opposite side, or by addition of trypsin to either side. Both conductance and potential changes are hindered by increasing the ionic strength or by raising the pH of the bathing medium, disappearing above pH 11.5 where it is known that Ps(+) folds into an α-helix. The interaction of polyglutamic acid (PGA) with a cationic cholesterol-hexadecyltrimethylammonium bromide BLM results in increased membrane conductance and development of an anionic transmembrane potential which is reverted by addition of polycations to the same aqueous phase where PGA is present. Addition of either Ps(+) or PGA to one or both sides of a neutral BLM composed of 7-dehydrocholesterol induces no significant change. The observations suggest the formation of a lipid polymer membrane resultant from the interaction, predominantly electrostatic, of the isolated components. The implications of these results are discussed in terms of the current models of membrane structure.
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Affiliation(s)
- M Montal
- Department of Biochemistry, Center for Research and Advanced Studies, National Polytechnic Institute, P.O. Box 14-740, México 14, D.F., México
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Minassian-Saraga LT, Wietzerbin J. The action of hexadecyltrimethyl ammonium bromide on bilayer lipid membranes. Biochem Biophys Res Commun 1970; 41:1231-7. [PMID: 5483625 DOI: 10.1016/0006-291x(70)90218-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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25
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Ting HP, Wilson DF, Chance B. Effects of uncouplers of oxidative phosphorylation on the specific conductance of bimolecular lipid membranes. Arch Biochem Biophys 1970; 141:141-6. [PMID: 5480108 DOI: 10.1016/0003-9861(70)90116-5] [Citation(s) in RCA: 65] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Dennis VW, Stead NW, Andreoli TE. Molecular aspects of polyene- and sterol-dependent pore formation in thin lipid membranes. J Gen Physiol 1970; 55:375-400. [PMID: 4938534 PMCID: PMC2203000 DOI: 10.1085/jgp.55.3.375] [Citation(s) in RCA: 58] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Amphotericin B modifies the permeability properties of thin lipid membranes formed from solutions containing sheep red cell phospholipids and cholesterol. At 10(-6)M amphotericin B, the DC membrane resistance fell from approximately 10(8) to approximately 10(2) ohm-cm(2), and the membranes became Cl(-)-, rather than Na(+)-selective; the permeability coefficients for hydrophilic nonelectrolytes increased in inverse relationship to solute size, and the rate of water flow during osmosis increased 30-fold. These changes may be rationalized by assuming that the interaction of amphotericin B with membrane-bound sterol resulted in the formation of aqueous pores. N-acetylamphotericin B and the methyl ester of N-acetylamphotericin B, but not the smaller ring compounds, filipin, rimocidin, and PA-166, produced comparable permeability changes in identical membranes, and amphotericin B and its derivatives produced similar changes in the properties of membranes formed from phospholipid-free sterol solutions. However, amphotericin B did not affect ionic selectivity or water and nonelectrolyte permeability in membranes formed from solutions containing phospholipids and no added cholesterol, or when cholesterol was replaced by either cholesterol palmitate, dihydrotachysterol, epicholesterol, or Delta5-cholesten-3-one. Phospholipid-free sterol membranes exposed to amphotericin B or its derivatives were anion-selective, but the degree of Cl(-) selectivity varied among the compounds, and with the aqueous pH. The data are discussed with regard to, first, the nature of the polyene-sterol interactions which result in pore formation, and second, the functional groups on amphotericin B responsible for membrane anion selectivity.
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The Effect of Modifiers on the Intrinsic Properties of Bilayer Lipid Membranes (BLM). ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 1970. [DOI: 10.1007/978-1-4615-9005-7_8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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Abstract
As one of the methods of finding out the structural change of lipid bilayers due to change of environmental solution, the capacitances of phosphatidyl choline (egg lecithin) and phosphatidyl serine (bovine brain) bilayer membranes in solutions of various pH and salt contents were measured. It was found that the capacitance of the bilayer depended upon pH and salt content. The capacitance had a minimum value around pH 4 for phosphatidyl choline and around pH 3-4 for phosphatidyl serine bilayers, respectively. The value of the capacitance increased as the pH of the solution became lower or higher. As the concentration of cholesterol in the phosphatidyl choline bilayer increased, the capacitance increased and reached a saturation value. A DC voltage across the phosphatidyl choline bilayer did not affect the value of the capacitance practically.
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Bernardo PD, Russo EJ. Pharmaceutical sciences--1968. A literature review of pharmaceutics. J Pharm Sci 1969; 58:777-812. [PMID: 4898312 DOI: 10.1002/jps.2600580702] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Miller IR, Bach D. Structure and membrane properties of lecithin monolayers at the polarized mercury-water interface. J Colloid Interface Sci 1969; 29:250-60. [PMID: 5776569 DOI: 10.1016/0021-9797(69)90194-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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36
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Ting HP, Huemoeller WA, Lalitha S, Diana AL, Tien HT. Properties of black lipid membranes of chloroplast pigments. BIOCHIMICA ET BIOPHYSICA ACTA 1968; 163:439-50. [PMID: 5727388 DOI: 10.1016/0005-2736(68)90073-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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37
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Vaidhyanathan VS, Goel NS. Stability of lipid films in aqueous electrolyte media: electrostatic interactions. J Theor Biol 1968; 21:331-47. [PMID: 5719248 DOI: 10.1016/0022-5193(68)90119-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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Lippe C. Effects of Amphotericin B on thiourea permeability of phospholipid and cholesterol bilayer membranes. J Mol Biol 1968; 35:635-7. [PMID: 5673698 DOI: 10.1016/s0022-2836(68)80019-1] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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39
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Ohki S, Goldup A. Influence of pH, sodium and calcium ions on the d.c. resistance of black egg lecithin-cholesterol films. Nature 1968; 217:458-9. [PMID: 5641760 DOI: 10.1038/217458a0] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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