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• W424442076 abstract "Red blood cell (RBC) membrane skeletons were observed during and after detergent extraction from RBC ghosts, using video microscopy, light scattering, and synchrotron-based small angle X-ray scattering. Optical tweezers were employed to trap and manipulate single cells under the light microscope. Immediately after extraction, the skeletons, which are two-dimensional protein networks, exhibited large thermal undulations and deformed strongly in response to small shear flow. Shrinkage by a factor of about two could be induced by screening the electrostatic repulsion in the network. Skeletons ceased to shrink at a monovalent salt concentration larger than 100 mM, which leads to an estimate of ≈120Å for the intrinsic persistence length of spectrin tetramers. Intriguingly, inspite of their large microscopic flexibility, the skeletons maintained roughly spherical shapes, and the static structure factor, measured over four orders of magnitude in length scale in the scattering experiments, displayed a power law exponent close to 2. This provides experimental evidence for the theoretically predicted flat phase of elastic tethered membranes, although a crumpled phase with a fractal dimension of Df=2.2±0.2 is also within the error limits of the data.KeywordsOptical TweezerStatic Light ScatteringMembrane SkeletonStatic Structure FactorDetergent ExtractionThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
• W424442076 created "2016-06-24" @default.
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• W424442076 date "1992-01-01" @default.
• W424442076 modified "2023-09-25" @default.
• W424442076 title "The Isolated Human Red Blood Cell Skeleton: An Example of a Flexible Tethered Membrane" @default.
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• W424442076 doi "https://doi.org/10.1007/978-3-642-84763-9_24" @default.
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