Liquid crystal organization of self-assembling cyclic peptides

2014 ◽  
Vol 50 (6) ◽  
pp. 688-690 ◽  
Author(s):  
Manuel Amorín ◽  
Ana Pérez ◽  
Joaquín Barberá ◽  
Haxel Lionel Ozores ◽  
José Luis Serrano ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cyclic Peptides ◽  
Self Assembling

scholarly journals Optical Response Associated with the Orientation and Structure of Liquid Crystals with Respect to Phosphatidylcholine Concentration

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 678
Author(s):  
Yuqi Han ◽  
Yan Jiang ◽  
Wei Guo ◽  
Bing Li ◽  
Lu Zhang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Reflectance Spectrum ◽  
Optical Response ◽  
The Self ◽  
Cholesteric Liquid Crystals ◽  
Anchoring Effect ◽  
Self Assembling ◽  
Sensitization Effect ◽  
Structure Of Liquid

Based on the anchoring effect due to the self-assembling behavior of the phospholipid molecules at the interface between the liquid crystal and water phases on the orientation of liquid crystals, the optical response associated with the orientation and structure of liquid crystals with respect to the concentration of 1,2-didodecanoyl-sn-glycero-3-phosphocholine solution has been investigated. The optical response owing to changes in the orientation and structure of the mixed cholesteric liquid crystals with respect to the change in the concentration of phosphatidylcholine has been obtained. Moreover, the feasibility of using as-prepared mixed cholesteric liquid crystals to measure the phosphatidylcholine concentration has been verified. A methodology to measure the reflectance spectrum by using mixed cholesteric liquid crystals to sensitize the phosphatidylcholine concentration has been further realized. The sensitization effect of the mixed cholesteric liquid crystals on the measurement of phosphatidylcholine concentration was also verified.

A Biological System Producing a Self-Assembling Cholesteric Protein Liquid Crystal

1971 ◽  
Vol 8 (1) ◽  
pp. 93-109
Author(s):  
A. C. NEVILLE ◽  
B. M. LUKE
Keyword(s):  
Liquid Crystal ◽  
Electron Density ◽  
Electron Micrographs ◽  
Self Assembly ◽  
Liquid Crystalline ◽  
Density Variation ◽  
Self Assembling ◽  
The Matrix ◽  
Electron Density Variation ◽  
Helicoidal Structure

The protein in the oothecal glands of praying mantids (Sphodromantis tenuidentata, Miomantis monacha) exists in the form of lamellar liquid crystalline spherulites, which coalesce as they flow out of a punctured gland tubule. Electron micrographs of sections of these spherulites after fixation show parabolic patterns of an electron-light component, set in a continuous matrix of protein. Such patterns arise in helicoidal systems (e.g. arthropod cuticle) and microdensitometric scans of the matrix show a rhythmical electron-density variation consistent with helicoidal structure. Double spiral patterns identical to those seen in liquid crystal spherulites are illustrated. These properties resemble those of cholesteric liquid crystals. The constructional units appear to be molecular rather than fibrillar as described by previous authors. The helicoidal architecture arises by self-assembly in the gland lumen. Lamellar surface structures self-assembled spontaneously on glass coverslips when the protein was left to stand for several days. When heated to 55 °C, the birefringent liquid crystalline protein abruptly changes to an isotropic gel, with associated loss of parabolic patterning in electron micrographs and of the rhythmical electron-density variation on microdensitometric scans. This behaviour is compared to the formation of gelatin from collagen, in terms of the randomization of an originally ordered secondary structure.

Liquid crystal properties of a self-assembling viral coat protein

2011 ◽  
Vol 38 (9) ◽  
pp. 1153-1157
Author(s):  
S.E. Fiester ◽  
A. Jákli ◽  
C.J. Woolverton
Keyword(s):  
Liquid Crystal ◽  
Coat Protein ◽  
Viral Coat Protein ◽  
Self Assembling ◽  
Crystal Properties ◽  
Viral Coat

Controlled Multistep Self-Assembling of Colloidal Droplets at a Nematic Liquid Crystal–Air Interface

2019 ◽  
Vol 123 (8) ◽  
Author(s):  
Nan Wang ◽  
Julian S. Evans ◽  
Chenxi Li ◽  
Victor M. Pergamenshchik ◽  
Ivan I. Smalyukh ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Self Assembling ◽  
Air Interface

scholarly journals Self-Assembling Behavior of Smart Nanocomposite System: Ferroelectric Liquid Crystal Confined by Stretched Porous Polyethylene Film

Nanomaterials ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1498
Author(s):  
Alexej Bubnov ◽  
Alexey Bobrovsky ◽  
Ivan Rychetský ◽  
Ladislav Fekete ◽  
Věra Hamplová
Keyword(s):  
Liquid Crystal ◽  
Dielectric Spectroscopy ◽  
Helical Structure ◽  
Dielectric Behavior ◽  
Ferroelectric Liquid Crystal ◽  
Porous Polyethylene ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Self Assembling ◽  
Nanocomposite System

The control and prediction of soft systems exhibiting self-organization behavior can be realized by different means but still remains a highlighted task. Novel advanced nanocomposite system has been designed by filling of a stretched porous polyethylene (PE) film with pore dimensions of hundreds of nanometers by chiral ferroelectric liquid crystalline (LC) compound possessing polar self-assembling behavior. Lactic acid derivative exhibiting the paraelectric orthogonal smectic A* and the ferroelectric tilted smectic C* phases over a broad temperature range is used as a self-assembling compound. The morphology of nanocomposite film has been checked by Atomic Force Microscopy (AFM). The designed nanocomposite has been studied by polarizing optical microscopy (POM), differential scanning calorimetry (DSC), small and wide-angle X-ray scattering and broadband dielectric spectroscopy. The effect of a porous PE confinement on self-assembling, structural, and dielectric behavior of the chiral LC compound has been established and discussed. While the mesomorphic and structural properties of the nanocomposite are found not to be much influenced in comparison to that of a pure LC compound, the polar properties have been toughly suppressed by the specific confinement. Nevertheless, the electro-optic switching was clearly observed under applied electric field of low frequency (210 V, 19 Hz). The dielectric spectroscopy and X-ray results reveal that the helical structure of the ferroelectric liquid crystal inside the PE matrix is completely unwound, and the molecules are aligned along stretching direction. Obtained results demonstrate possibilities of using stretched porous polyolefins as promising matrices for the design of new nanocomposites.

Molecular Pom Poms from Self-Assembling α,γ-Cyclic Peptides

2014 ◽  
Vol 20 (33) ◽  
pp. 10260-10265 ◽  
Author(s):  
Michele Panciera ◽  
Manuel Amorín ◽  
Juan R. Granja
Keyword(s):  
Cyclic Peptides ◽  
Self Assembling

scholarly journals Functional Smart Dispersed Liquid Crystals for Nano- and Biophotonic Applications: Nanoparticles-Assisted Optical Bioimaging

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
N. V. Kamanina ◽  
S. V. Likhomanova ◽  
Yu. A. Zubtcova ◽  
A. A. Kamanin ◽  
A. Pawlicka
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Solid Substrate ◽  
Holographic Recording ◽  
Self Assembling ◽  
Aligned Carbon Nanotubes ◽  
Vertically Aligned ◽  
Crystal Cells ◽  
Modified Functional

Functional nematic liquid crystal structures doped with nano- and bioobjects have been investigated. The self-assembling features and the photorefractive parameters of the structured liquid crystals have been comparatively studied via microscopy and laser techniques. Fullerene, quantum dots, carbon nanotubes, DNA, and erythrocytes have been considered as the effective nano- and biosensitizers of the LC mesophase. The holographic recording technique based on four-wave mixing of the laser beams has been used to investigate the laser-induced change of the refractive index in the nano- and bioobjects-doped liquid crystal cells. The special accent has been given to novel nanostructured relief with vertically aligned carbon nanotubes at the interface: solid substrate-liquid crystal mesophase. It has been shown that this nanostructured relief influences the orienting ability of the liquid crystal molecules with good advantage. As a result, it provokes the orientation of the DNA. The modified functional liquid crystal materials have been proposed as the perspective systems for both the photonics and biology as well as the medical applications.

scholarly journals Self-Assembling Cyclic Peptides:  Molecular Dynamics Studies of Dimers in Polar and Nonpolar Solvents†

2006 ◽  
Vol 110 (38) ◽  
pp. 18965-18972 ◽  
Author(s):  
Ekta Khurana ◽  
Steven O. Nielsen ◽  
Bernd Ensing ◽  
Michael L. Klein
Keyword(s):  
Molecular Dynamics ◽  
Cyclic Peptides ◽  
Nonpolar Solvents ◽  
Self Assembling

scholarly journals Stability and growth mechanism of self-assembling putative antifreeze cyclic peptides

2017 ◽  
Vol 19 (29) ◽  
pp. 19032-19042 ◽  
Author(s):  
Z. Faidon Brotzakis ◽  
Mascha Gehre ◽  
Ilja K. Voets ◽  
Peter G. Bolhuis
Keyword(s):  
Growth Mechanism ◽  
Cyclic Peptides ◽  
Cyclic Peptide ◽  
Growth Mechanisms ◽  
Self Assembling ◽  
Peptide Nanotube ◽  
Cyclic Peptide Nanotube

From right to left: three distinct growth mechanisms of a pentamer to a hexamer putative antifreeze cyclic peptide nanotube.

Sign in / Sign up

Export Citation Format

Share Document