Signature of a nonharmonic potential as revealed from a consistent shape and fluctuation analysis of an adherent membrane
The interaction of fluid membranes with a scaffold, which can be a planar surface or a more complex structure, is intrinsic to a number of systems from artificial supported bilayers and vesicles to cellular membranes. In principle, these interactions can be either discrete and protein mediated, or c...
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| Main Authors: | , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
5 May 2014
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| In: |
Physical review. X, Expanding access
Year: 2014, Volume: 4, Issue: 2 |
| ISSN: | 2160-3308 |
| DOI: | 10.1103/PhysRevX.4.021023 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevX.4.021023 Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevX.4.021023 
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| Author Notes: | Daniel Schmidt, Cornelia Monzel, Timo Bihr, Rudolf Merkel, Udo Seifert, Kheya Sengupta, and Ana-Sunčana Smith |
| Summary: | The interaction of fluid membranes with a scaffold, which can be a planar surface or a more complex structure, is intrinsic to a number of systems from artificial supported bilayers and vesicles to cellular membranes. In principle, these interactions can be either discrete and protein mediated, or continuous. In the latter case, they emerge from ubiquitous intrinsic surface interaction potentials as well as nature-designed steric contributions of the fluctuating membrane or from the polymers of the glycocalyx. Despite the fact that these nonspecific potentials are omnipresent, their description has been a major challenge from experimental and theoretical points of view. Here, we show that a full understanding of the implications of the continuous interactions can be achieved only by expanding the standard superposition models commonly used to treat these types of systems, beyond the usual harmonic level of description. Supported by this expanded theoretical framework, we present three independent, yet mutually consistent, experimental approaches to measure the interaction potential strength and the membrane tension. Upon explicitly taking into account the nature of shot noise as well as the nature of finite experimental resolution, excellent agreement with the augmented theory is obtained, which finally provides a coherent view of the behavior of the membrane in the vicinity of a scaffold. |
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| Item Description: | Gesehen am 24.08.2020 |
| Physical Description: | Online Resource |
| ISSN: | 2160-3308 |
| DOI: | 10.1103/PhysRevX.4.021023 |