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Relevant bibliographies by topics / Chiral Geometries

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Journal articles

Academic literature on the topic 'Chiral Geometries'

Author: Grafiati

Published: 6 September 2023

Last updated: 7 September 2023

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Journal articles on the topic "Chiral Geometries"

1

De Santo, Maria Penelope, Lorenza Spina, and Federica Ciuchi. "Chiral Chromonics Confined in Spherical Geometries." Applied Sciences 13, no. 7 (2023): 4507. http://dx.doi.org/10.3390/app13074507.

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Chromonic liquid crystals have recently received a lot of attention due to their spontaneous self-assembly in supramolecular columnar structures that, depending on their concentration in water, align to form a nematic liquid crystalline phase. The chirality may be induced in chromonics by adding chiral moieties to the nematic phase or enhanced by confining them in curved geometrical constraints. This review summarizes the recent research developments on chiral chromonic liquid crystals confined in spherical geometry, relating the results to what was observed for thermotropic liquid crystals in the same conditions. The review focuses on the studies carried out on commercially available nematic chromonics, investigating the effects on their topologies in different anchoring conditions and different chiral dopants and suggesting an application in the sensor field.

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2

Leemans, Dimitri, and Philippe Tranchida. "On residual connectedness in chiral geometries." Algebraic Combinatorics 4, no. 3 (2021): 491–99. http://dx.doi.org/10.5802/alco.162.

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3

Lowe, David A., and Shubho Roy. "Chiral geometries of (2+1)-d AdS gravity." Physics Letters B 668, no. 2 (2008): 159–62. http://dx.doi.org/10.1016/j.physletb.2008.08.026.

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4

Öeren, Mario, Elena Shmatova, Toomas Tamm, and Riina Aav. "Computational and ion mobility MS study of (all-S)-cyclohexylhemicucurbit[6]uril structure and complexes." Phys. Chem. Chem. Phys. 16, no. 36 (2014): 19198–205. http://dx.doi.org/10.1039/c4cp02202e.

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5

Ma, Wei, Changlong Hao, Maozhong Sun, Liguang Xu, Chuanlai Xu, and Hua Kuang. "Tuning of chiral construction, structural diversity, scale transformation and chiroptical applications." Materials Horizons 5, no. 2 (2018): 141–61. http://dx.doi.org/10.1039/c7mh00966f.

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Dissymmetry is crucial for chiral geometries that utilize either intrinsic anisotropy forces around nanoparticles (NPs) or external organization associated with templates or applied fields and alignment.

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6

Chen, Sicong, Qiwen Teng та Shi Wu. "Theoretical studies on the binding affinities of β-cyclodextrin to small molecules and monosaccharides". Open Chemistry 4, № 2 (2006): 223–33. http://dx.doi.org/10.2478/s11532-006-0013-5.

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AbstractEquilibrium geometries and electronic structures of complexes between β-cyclodextrin (β-CD) and some small molecules as well as monosaccharides were investigated by Austin Model 1 (AM1) to obtain binding energy of the complexes. It was indicated that β-CD could bind the structurally similar solvent molecules and monosaccharides because of the negative binding energy of the complexes, and especially could show the chiral binding ability to monosaccharides with more hydroxyl groups, due to its chiral characteristics. The complexes were stabilized by the hydrogen bonding between β-CD and guests. Based on the AM1 optimized geometries, the IR spectra were calculated by AM1 method. Vibration frequencies of O-H bonds in the guests were red-shifted owing to the weakening of the O-H bonds with the formation of the complexes.

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7

Skolnick, Jeffrey, Hongyi Zhou, and Mu Gao. "On the possible origin of protein homochirality, structure, and biochemical function." Proceedings of the National Academy of Sciences 116, no. 52 (2019): 26571–79. http://dx.doi.org/10.1073/pnas.1908241116.

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Living systems have chiral molecules, e.g., native proteins that almost entirely contain L-amino acids. How protein homochirality emerged from a background of equal numbers of L and D amino acids is among many questions about life’s origin. The origin of homochirality and its implications are explored in computer simulations examining the stability and structural and functional properties of an artificial library of compact proteins containing 1:1 (termed demi-chiral), 3:1, and 1:3 ratios of D:L and purely L or D amino acids generated without functional selection. Demi-chiral proteins have shorter secondary structures and fewer internal hydrogen bonds and are less stable than homochiral proteins. Selection for hydrogen bonding yields a preponderance of L or D amino acids. Demi-chiral proteins have native global folds, including similarity to early ribosomal proteins, similar small molecule ligand binding pocket geometries, and many constellations of L-chiral amino acids with a 1.0-Å RMSD to native enzyme active sites. For a representative subset containing 550 active site geometries matching 457 (2) 4-digit (3-digit) enzyme classification (E.C.) numbers, native active site amino acids were generated at random for 472 of 550 cases. This increases to 548 of 550 cases when similar residues are allowed. The most frequently generated sequences correspond to ancient enzymatic functions, e.g., glycolysis, replication, and nucleotide biosynthesis. Surprisingly, even without selection, demi-chiral proteins possess the requisite marginal biochemical function and structure of modern proteins, but were thermodynamically less stable. If demi-chiral proteins were present, they could engage in early metabolism, which created the feedback loop for transcription and cell formation.

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8

Cirilo-Lombardo, Diego Julio. "Born-Infeld generalization: Axion and Kalb-Ramond from dynamical torsion fields." Europhysics Letters 135, no. 6 (2021): 61001. http://dx.doi.org/10.1209/0295-5075/ac2cfa.

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Abstract We show that in theories of gravitation based on affine geometries the torsion field, that takes a dynamical character, not only the chiral magnetic effect (CME) intervenes in the wash up of the chiral anomaly but also the chiral vortical effect (CVE) and the coupled chiral effect (CCE) coming from the hypermagnetic field interaction with the primordial plasma are crucial in a realistic physical scenario, as in the case of the early universe. We also show that the equation governing the wash up takes the form given in this paper, supplemented with the dynamical equation for the torsion vector containing the helicities and other axial couplings. The role played by the neutrinos in the interaction with the axion field in this theoretical framework is briefly discussed.

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9

BRACKEN, PAUL. "LINKS BETWEEN THE QUANTUM HALL EFFECT, CHIRAL BOSON THEORIES AND STRING THEORY." International Journal of Modern Physics E 13, no. 05 (2004): 961–71. http://dx.doi.org/10.1142/s021830130400251x.

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Chiral boson theory is introduced and its relevance to the quantum Hall effect is explained. It is shown that the chiral boson theory admits mode expansions which are essentially those which appear and are made use of in bosonic string theories. This immediately leads to a way of quantizing the theory. Restrictions on various parameters appearing in the model can be imposed in a natural way. Finally, it is suggested that some of these ideas have important applications to other geometries which could give rise to new types of physical behavior.

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10

Sevrin, Alexander, Wieland Staessens, and Alexander Wijns. "AnN= 2 worldsheet approach to D-branes in bihermitian geometries: I. Chiral and twisted chiral fields." Journal of High Energy Physics 2008, no. 10 (2008): 108. http://dx.doi.org/10.1088/1126-6708/2008/10/108.

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