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Symmetry, Volume 13, Issue 4

April 2021 - 209 articles

Cover Story: The gate of a potassium channel, from its X-ray structure, has been studied. Parts have been calculated, and, with protons properly placed, calculation and X-ray structure agree. The figure shows four S6 helices bordering the gate. The purple sphere is a K+ ion, the small central molecules are water molecules, and the outer lines are six amino acids. View this paper.
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Articles (209)

  • Article
  • Open Access
16 Citations
3,041 Views
13 Pages

20 April 2021

This paper describes the stability and Hopf bifurcation analysis of the Brusselator system with delayed feedback control in the single domain of a reaction–diffusion cell. The Galerkin analytical technique is used to present a system equation compose...

  • Article
  • Open Access
13 Citations
3,311 Views
16 Pages

New Method for Generating New Families of Distributions

  • Lamya A. Baharith and
  • Wedad H. Aljuhani

20 April 2021

This article presents a new method for generating distributions. This method combines two techniques—the transformed—transformer and alpha power transformation approaches—allowing for tremendous flexibility in the resulting distributions. The new app...

  • Article
  • Open Access
28 Citations
2,986 Views
15 Pages

20 April 2021

All external electromagnetic fields in which the Klein-Gordon-Fock equation admits the first-order symmetry operators are found, provided that in the space-time V4 a group of motion G3 acts simply transitively on a non-null subspace of transitivity V...

  • Article
  • Open Access
5 Citations
3,428 Views
16 Pages

Examination and Comparison of Theta Band Connectivity in Left- and Right-Hand Dominant Individuals throughout a Motor Skill Acquisition

  • Jessica McDonnell,
  • Nicholas P Murray,
  • Sungwoo Ahn,
  • Stefan Clemens,
  • Erik Everhart and
  • J. Chris Mizelle

20 April 2021

The majority of the population identifies as right-hand dominant, with a minority 10.6% identifying as left-hand dominant. Social factors may partially skew the distribution, but it remains that left-hand dominant individuals make up approximately 40...

  • Article
  • Open Access
5 Citations
2,819 Views
17 Pages

20 April 2021

In this paper a system of nonlinear Riemann–Liouville fractional differential equations with non-instantaneous impulses is studied. We consider a Riemann–Liouville fractional derivative with a changeable lower limit at each stop point of...

  • Article
  • Open Access
5 Citations
3,109 Views
24 Pages

Multi-Criteria Seed Selection for Targeting Multi-Attribute Nodes in Complex Networks

  • Artur Karczmarczyk,
  • Jarosław Jankowski and
  • Jarosław Wątrobski

20 April 2021

Online environments have evolved from the early-stage technical systems to social platforms with social communication mechanisms resembling the interactions which can be found in the real world. Online marketers are using the close relations between...

  • Article
  • Open Access
7 Citations
3,008 Views
19 Pages

Chirality, Gelation Ability and Crystal Structure: Together or Apart? Alkyl Phenyl Ethers of Glycerol as Simple LMWGs

  • Alexander A. Bredikhin,
  • Aidar T. Gubaidullin,
  • Zemfira A. Bredikhina,
  • Robert R. Fayzullin and
  • Olga A. Lodochnikova

20 April 2021

Chiral recognition plays an important role in the self-assembly of soft materials, in particular supramolecular organogels formed by low molecular weight gelators (LMWGs). Out of 14 pairs of the studied racemic and enantiopure samples of alkyl-substi...

  • Article
  • Open Access
24 Citations
6,277 Views
12 Pages

Room Temperature Syntheses of ZnO and Their Structures

  • Domenica Tommasa Donia,
  • Elvira Maria Bauer,
  • Mauro Missori,
  • Ludovica Roselli,
  • Daniele Cecchetti,
  • Pietro Tagliatesta,
  • Lorenzo Gontrani and
  • Marilena Carbone

20 April 2021

ZnO has many technological applications which largely depend on its properties, which can be tuned by controlled synthesis. Ideally, the most convenient ZnO synthesis is carried out at room temperature in an aqueous solvent. However, the correct temp...

  • Article
  • Open Access
8 Citations
3,580 Views
23 Pages

19 April 2021

When the double-rope winding hoisting system (DWHS) is in operation, tensions of two wire ropes of the DWHS will not be symmetrical because of some factors such as different manufacturing deviation between the twin winding drum and two wire ropes, di...

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Symmetry - ISSN 2073-8994