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Uri Raviv
Researcher at Hebrew University of Jerusalem
Publications - 113
Citations - 5416
Uri Raviv is an academic researcher from Hebrew University of Jerusalem. The author has contributed to research in topics: Membrane & Tubulin. The author has an hindex of 36, co-authored 107 publications receiving 4901 citations. Previous affiliations of Uri Raviv include Weizmann Institute of Science & Technion – Israel Institute of Technology.
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Lubrication by charged polymers
TL;DR: It is shown that brushes of charged polymers (polyelectrolytes) attached to surfaces rubbing across an aqueous medium result in superior lubrication compared to other polymeric surfactants.
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Fluidity of water confined to subnanometre films
TL;DR: It is observed that the effective viscosity of water remains within a factor of three of its bulk value, even when it is confined to films in the thickness range 3.5 ± 1 to 0.0 ± 0.4 nm, which contrasts markedly with the behaviour of organic solvents, whose visCosity diverges when confined to Films thinner than about 5–8 molecular layers.
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Fluidity of bound hydration layers.
TL;DR: It is found that the bound water molecules retain a shear fluidity characteristic of the bulk liquid, even when compressed down to films 1.0 ± 0.3 nanometer thick, due to the ready exchange of water molecules within the hydration layers as they rub past each other under strong compression.
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Higher-order assembly of microtubules by counterions: from hexagonal bundles to living necklaces.
Daniel J. Needleman,Miguel A. Ojeda-Lopez,Uri Raviv,Herbert P. Miller,Leslie Wilson,Cyrus R. Safinya +5 more
TL;DR: A living necklace bundle phase is discovered, comprised of 2D dynamic assemblies of MTs with linear, branched, and loop topologies, which may be used as templates for miniaturized materials with applications in nanotechnology and biotechnology.
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Synchrotron X-ray diffraction study of microtubules buckling and bundling under osmotic stress: a probe of interprotofilament interactions.
Daniel J. Needleman,Miguel A. Ojeda-Lopez,Uri Raviv,Kai K. Ewert,Jayna B. Jones,Herbert P. Miller,Leslie Wilson,Cyrus R. Safinya +7 more
TL;DR: Synchrotron x-ray diffraction of microtubules under increasing osmotic stress shows they transition to rectangular bundles with noncircular buckled cross sections, followed by hexagonally packed bundles, yielding insight into the mechanism by which associated proteins and the chemotherapy drug taxol stabilize microtubule wall.