Shape selection and multi-stability in helical ribbons

Guo, Qiaohang; Mehta, Anil; Grover, Martha A.; Chen, Wenzhe; Lynn, David G.; Chen, Zi

doi:10.1063/1.4878941

Cited by 63 publications

(50 citation statements)

References 59 publications

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“…This arrangement has previously been suggested to stabilize sheet lamination, allowing access to helical ribbons and ultimately the nanotubes (Figure 2h). 11,18,30 The switch from antiparallel out-of-register strands to antiparallel in-register strands requires more than mere slippage, as the peptide must rotate 180° along its long axis, likely requiring dissociation from the β-sheet.…”

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confidence: 99%

Multistep Conformation Selection in Amyloid Assembly

et al. 2017

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confidence: 99%

Multistep Conformation Selection in Amyloid Assembly

et al. 2017

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“…Moreover, in the presence of μm is used as an initial shape. α A of 0.0214 (α GUV ) and P aff of 0.5% are used mechanical anisotropy (or misfit strains), shape transitions among multistable morphologies (e.g., flat shell, helical ribbon, saddle shape, and cylindrical configuration) have been found in many other physical and biological systems [38][39][40].…”

Section: A Formation and Disappearance Of The Cristaelike Structure mentioning

confidence: 99%

Effects of localpHon the formation and regulation of cristae morphologies

et al. 2014

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Cristae, folded subcompartments of the inner mitochondrial membrane (IMM), have complex and dynamic morphologies. Since cristae are the major site of adenosine triphosphate synthesis, morphological changes of cristae have been studied in relation to functional states of mitochondria. In this sense, investigating the functional and structural significance of cristae may be critical for understanding progressive mitochondrial dysfunction. However, the detailed mechanisms of the formation and regulation of these cristae structures have not been fully elucidated. Among the hypotheses concerning the regulation of cristae morphologies, we exclusively investigate the effects of the local pH gradient on the cristae morphologies by using a numerical model. An area-difference induced curvature of the membrane is modeled as a function of local pH. This curvature is then applied to the finite element model of a closed lipid bilayer in order to find the energetically favorable membrane configuration. From this study, we substantiate the hypothesis that a tubular crista structure can be formed and regulated by the local pH gradient. Through the simulations with various initial conditions, we further demonstrate that the diameter of a crista is mainly determined by the local pH gradient, and the energetically favorable direction of crista growth is perpendicular to the longitudinal axis of a mitochondrion. Finally, the simulation results at the mitochondrial scale suggest that the cristae membrane may have a lower local pH value and/or a higher cardiolipin composition than the other parts of the IMM.

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“…3)). The parental bulk material, especially for the local structure containing the sp 3 -hybridized trimer, is tantalum pentoxide Ta 2 O 5 [32,41]. It is an oxide with a high dielectric constant, and with a reported band gap of ∼ 1 -4 eV.…”

Section: Explanation Of Plaquette Shapes and Contrast Reversalmentioning

confidence: 99%

Atomically thin oxide layer on the elemental superconductor Ta(001) surface

Mozara

Kamlapure

Valentyuk

et al. 2019

Phys. Rev. Materials

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Recently the oxygen-reconstructed tantalum surface Ta(001)-p(3×3)-O has experienced considerable attention due its use as a potential platform for Majorana physics in adatom chains. Experimental studies using scanning tunneling microscopy and spectroscopy found rich atomic and electronic structures already for the clean Ta(001)-O surface, which we combine here with ab initio methods. We discover two metastable superstructures at the root of the different topographic patterns, discuss its emergence during annealing, and identify the electronic properties. The latter is determined as the sole origin for the contrast reversal seen at positive bias. The observed effects are essentially connected to the two distinct oxygen states appearing on the surface in different geometries. The second superstructure was found in simulations by introducing oxygen vacancies, what was also observed in tantalum pentoxide systems. Additionally we study the charge distribution on the oxidized surface and underline its importance for the adsorption process of polarizable atoms and molecules.

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Shape selection and multi-stability in helical ribbons

Cited by 63 publications

References 59 publications

Multistep Conformation Selection in Amyloid Assembly

Multistep Conformation Selection in Amyloid Assembly

Effects of localpHon the formation and regulation of cristae morphologies

Atomically thin oxide layer on the elemental superconductor Ta(001) surface

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