Ellipsoidal Relaxation of Deformed Vesicles

Yu, Miao; Lira, Raphael B.; Riske, Karin A.; Dimova, Rumiana; Lin, Hao

doi:10.1103/physrevlett.115.128303

Cited by 71 publications

(80 citation statements)

References 40 publications

(55 reference statements)

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“…where a and b are the lattice parameters of FeSe. The results indicated that the enhancement of S(Q, ω) is coupled to the orthorhombic phase, which is consistent with the theoretical proposals of a nematic order driven by spin fluctuations [74][75][76][77].…”

Section: Structural Phase Transition and Nematicitysupporting

confidence: 88%

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

Rößler

Koz

Wirth

et al. 2016

Physica Status Solidi (b)

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This article reviews recent experimental investigations on two binary Fe-chalcogenides: FeSe and Fe1+yTe. The main focus is on synthesis, single crystal growth, chemical composition, as well as on the effect of excess iron on structural, magnetic, and transport properties of these materials. The structurally simplest Fe-based superconductor Fe1+xSe with a critical temperature Tc ≈ 8.5 K undergoes a tetragonal to orthorhombic phase transition at a temperature Ts ≈ 87 K. No longrange magnetic order is observed down to the lowest measured temperature in Fe1+xSe. On the other hand, isostructural Fe1+yTe displays a complex interplay of magnetic and structural phase transitions in dependence on the tuning parameter such as excess amount of Fe or pressure, but it becomes a superconductor only when Te is substituted by a sufficient amount of Se. We summarize experimental evidence for different competing interactions and discuss related open questions.

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Section: Structural Phase Transition and Nematicitysupporting

confidence: 88%

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

Rößler

Koz

Wirth

et al. 2016

Physica Status Solidi (b)

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“…The microfluidic device was filled with 10% DOPG vesicles, as negative GUVs have been found to be more affected, and a solution of PILs at 0.1 × 10 −3 m was introduced (see Movie S1 in the Supporting Information). [28] Thus, vesicles having more excess area (low tension) could potentially wrap the particles while tense ones might already reach the lysis tension of ≈5-10 mN m −1 [29] after coming into contact with only a few particles and then burst. The particles may mediate adhesion of the vesicles to the glass leading to tension increase and rupture.…”

Section: Dynamics Of Guv Responsementioning

confidence: 99%

Poly(Ionic Liquid) Nanoparticles Selectively Disrupt Biomembranes

et al. 2018

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Polymer‐based nanoparticles have an increasing presence in research due to their attractive properties, such as flexible surface functionality design and the ability to scale up production. Poly(ionic liquid) (PIL) nanoparticles of size below 50 nm are very unique in terms of their high charge density and internal onion‐like morphology. The interaction between PIL nanoparticles and giant unilamellar vesicles (GUVs) of various surface charge densities is investigated. GUVs represent a convenient model system as they mimic the size and curvature of plasma membranes, while simultaneously offering direct visualization of the membrane response under the microscope. Incubating PIL nanoparticles with GUVs results in poration of the lipid membrane in a concentration‐ and charge‐dependent manner. A critical poration concentration of PILs is located and the interactions are found to be analogous to those of antimicrobial peptides. Microbial mimetic membranes are already affected at submicromolar PIL concentrations where contrast loss is observed due to sugar exchange across the membrane, while at high concentrations the collapse of vesicles is observed. Finally, a confocal microscopy–based approach assessing the particle permeation through the membrane is reported and a mechanism based on bilayer frustration and pore stabilization via particle integration in the membrane is proposed.

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“…Experiments on GUVs in alternating current (AC) fields have shown that the extent of membrane deformation depends on the bending rigidity of the membrane 48 . Additionally, in DC field experiments, non-electroporative pulses can be used to study the stiffness of the membrane 49 . In our experiments we focused on pulses around the transmembrane voltage of 1V, therefore we cannot derive the precise mechanical properties.…”

Section: Resultsmentioning

confidence: 99%

Unraveling the response of a biomimetic actin cortex to electric pulses in vesicles

Perrier

Vahid

Kathavi

et al. 2018

Preprint

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5The plasma membrane is essential for maintaining the integrity of living cells. Its shape and 6 mechanical properties are regulated by a subjacently attached interconnected network of 7 actin filaments, known as the "actin cortex". The actin cortex is a major factor influencing 8 the mechanical response of the cell to external physical cues. In this study, using giant unil-9 amellar vesicles (GUVs) as a model system, we investigate the role of the actin cortex during 10 the application of electric pulses that induce electroporation or electropermeabilization. We 11 demonstrate that the presence of an actin cortex inhibits the formation of macropores in the 12 electroporated GUVs and slows down the resealing process of the permeabilized membrane. 13We further analyze the stability of the actin cortex inside the GUVs exposed to high electric 14 pulses. We find disruption of the actin cortex that is likely due to the electrophoretic forces 15 acting on the actin filaments during the permeabilization of the GUVs. Our findings also 16 reveal that the current simplified experimental models of cells need to be endowed with an 17 actin cortex in order to more closely mimic the complex nature of cellular membranes.

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Ellipsoidal Relaxation of Deformed Vesicles

Cited by 71 publications

References 40 publications

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

Synthesis, phase stability, structural, and physical properties of 11‐type iron chalcogenides

Poly(Ionic Liquid) Nanoparticles Selectively Disrupt Biomembranes

Unraveling the response of a biomimetic actin cortex to electric pulses in vesicles

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