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• W3099178466 endingPage "105011" @default.
• W3099178466 startingPage "105011" @default.
• W3099178466 abstract "Membrane elastic properties play a major role in membrane remodeling events, such as vesicle fusion and fission. They are also crucial in drug delivery by liposomes. Different experimental techniques are available to measure elastic properties. Among them, atomic force microscopy (AFM) presents the unique advantage of being directly applicable to nano-sized liposomes. Unfortunately, different AFM measures reported in the literature show little agreement among each other and are difficult to compare with measures of bending modulus obtained by other experimental techniques or by molecular simulations. In this work we determine the bending rigidity of Egg PC liposomes in terms of Young modulus via AFM measurements, using two different tip shapes and different cantilever force constants. We interpret the measures using the Hertz and Shell models, and observe a clear dependency of the Young modulus values on the tip properties and on the interpretative theory. The effect of the AFM tip shape is less important than the effect of the cantilever force constant, and the mathematical model has a major effect on the interpretation of the data. The Shell theory provides the closest agreement between AFM data and other experimental data for the membrane bending modulus. Finally, we compare the results to calculations of bending modulus from molecular dynamics simulations of membrane buckles. Simulations provide values of bending modulus consistent with literature data, but the agreement with AFM experiments is reasonable only for some specific experimental conditions." @default.
• W3099178466 created "2020-11-23" @default.
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• W3099178466 date "2021-01-01" @default.
• W3099178466 modified "2023-09-30" @default.
• W3099178466 title "Elastic moduli of lipid membranes: Reproducibility of AFM measures" @default.
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• W3099178466 doi "https://doi.org/10.1016/j.chemphyslip.2020.105011" @default.
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• W3099178466 hasPublicationYear "2021" @default.
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