scholarly journals Photothermal Regenerated Fibers with Enhanced Toughness: Silk Fibroin/MoS2 Nanoparticles

Polymers ◽  
2021 ◽  
Vol 13 (22) ◽  
pp. 3937
Author(s):  
Jianjun Guo ◽  
Bo Yang ◽  
Qiang Ma ◽  
Sandra Senyo Fometu ◽  
Guohua Wu
Keyword(s):  
Silk Fibroin ◽  
Self Assembly ◽  
Molybdenum Sulfide ◽  
Dependent Manner ◽  
Hybrid Fibers ◽  
Concentration Dependent Manner ◽  
Good Thermal Stability ◽  
Regenerated Silk Fibroin ◽  
Mos2 Nanoparticles ◽  
Regenerated Fibers

The distinctive mechanical and photothermal properties of Molybdenum sulfide (MoS2) have the potential for improving the functionality and utilization of silk products in various sectors. This paper reports on the preparation of regenerated silk fibroin/molybdenum disulfide (RSF/MoS2) nanoparticles hybrid fiber with different MoS2 nanoparticles contents by wet spinning. The simulated sunlight test indicated that the temperature of 2 wt% RSF/MoS2 nanoparticles hybrid fibers could rise from 20.0 °C to 81.0 °C in 1 min and 98.6 °C in 10 min, exhibiting good thermal stability. It was also demonstrated that fabrics made by manual blending portrayed excellent photothermal properties. The addition of MoS2 nanoparticles could improve the toughness of hybrid fibers, which may be since the mixing of MoS2 nanoparticles hindered the self-assembly of β-sheets in RSF solution in a concentration-dependent manner because RSF/MoS2 nanoparticles hybrid fibers showed a lower β-sheet content, crystallinity, and smaller crystallite size. This study describes a new way of producing high toughness and photothermal properties fibers for multifunctional fibers’ applications.

scholarly journals Terminal short arm domains of basement membrane laminin are critical for its self-assembly.

1990 ◽  
Vol 110 (3) ◽  
pp. 825-832 ◽  
Author(s):  
J C Schittny ◽  
P D Yurchenco
Keyword(s):  
Self Assembly ◽  
Affinity Column ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Calcium Dependent ◽  
Domain Specific ◽  
Binding Domains ◽  
Individual Domain ◽  
The Individual

Laminin self-assembles into large polymers by a cooperative two-step calcium-dependent mechanism (Yurchenco, P. D., E. C. Tsilibary, A. S. Charonis, and H. Furthmayr. 1985. J. Biol. Chem. 260:7636-7644). The domain specificity of this process was investigated using defined proteolytically generated fragments corresponding to the NH2-terminal globule and adjacent stem of the short arm of the B1 chain (E4), a complex of the two short arms of the A and B2 chains attached to the proximal stem of a third short arm (E1'), a similar complex lacking the globular domains (P1'), and the distal half of the long arm attached to the adjacent portion of the large globule (E8). Polymerization, followed by an increase of turbidity at 360 nm in neutral isotonic TBS containing CaCl2 at 35 degrees C, was quantitatively inhibited in a concentration-dependent manner with laminin fragments E4 and E1' but not with fragments E8 and P1'. Affinity retardation chromatography was used for further characterization of the binding of laminin domains. The migration of fragment E4, but not of fragments E8 and P1', was retarded in a temperature- and calcium-dependent fashion on a laminin affinity column but not on a similar BSA column. These data are evidence that laminin fragments E4 and E1' possess essential terminal binding domains for the self-aggregation of laminin, while fragments E8 and P1' do not. Furthermore, the individual domain-specific interactions that contribute to assembly are calcium dependent and of low affinity.

scholarly journals Fluorescein-Labeled Starch Maleate Nanoparticles as Sensitive Fluorescent Sensing Probes for Metal Ions

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Suk Fun Chin ◽  
Aressa Azman ◽  
Suh Cem Pang ◽  
Sing Muk Ng
Keyword(s):  
Particle Size ◽  
Metal Ions ◽  
Self Assembly ◽  
Detection Limits ◽  
Emission Wavelength ◽  
Dependent Manner ◽  
Ethanolic Solution ◽  
Concentration Dependent Manner ◽  
Maximum Emission ◽  
Fluorescent Sensing

Fluorescein 5(6)-isothiocyanate starch maleate (FISM) nanoparticles were prepared by covalently attached fluorescein 5(6)-isothiocyanate (FITC) with starch maleate. FISM nanoparticles with a mean particle size of 87 nm were formed via self-assembly upon precipitation in ethanolic solution. FISM nanoparticles were strongly fluorescent with maximum emission wavelength of 518 nm. The fluorescence of FISM nanoparticles can be quenched by silver (Ag+) and lead (Pb2+) ions in a concentration dependent manner. We have demonstrated the first use of FISM nanoparticles as cheap and effective fluorescent sensing probes for Ag+and Pb2+ions with detection limits as low as 2.55×10−5 M and 3.64×10−5 M, respectively.

Self-assembling triazolophanes: from croissants through donuts to spherical vesicles

2015 ◽  
Vol 51 (32) ◽  
pp. 6905-6908 ◽  
Author(s):  
V. Haridas ◽  
Appa Rao Sapala ◽  
Jerry P. Jasinski
Keyword(s):  
Crystal Structure ◽  
Self Assembly ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
X Ray ◽  
Self Assembling ◽  
Assembly Mechanism ◽  
Spherical Vesicles

A detailed ultramicroscopic analysis of three novel triazolophanes demonstrated a hierarchical self-assembly mechanism. These macrocycles self-assemble in a concentration dependent manner to hemi-toroids, toroids and finally to vesicles. The finding was supported by ultramicroscopy and X-ray crystal structure studies.

scholarly journals Structure of KAP1 tripartite motif identifies molecular interfaces required for retroelement silencing

2019 ◽  
Vol 116 (30) ◽  
pp. 15042-15051 ◽  
Author(s):  
Guido A. Stoll ◽  
Shun-ichiro Oda ◽  
Zheng-Shan Chong ◽  
Minmin Yu ◽  
Stephen H. McLaughlin ◽  
...  
Keyword(s):  
Self Assembly ◽  
Coiled Coil ◽  
Structural Data ◽  
Higher Order ◽  
Significant Loss ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Krab Domain ◽  
Genome Damage ◽  
Tripartite Motif

Transcription of transposable elements is tightly regulated to prevent genome damage. KRAB domain-containing zinc finger proteins (KRAB-ZFPs) and KRAB-associated protein 1 (KAP1/TRIM28) play a key role in regulating retrotransposons. KRAB-ZFPs recognize specific retrotransposon sequences and recruit KAP1, inducing the assembly of an epigenetic silencing complex, with chromatin remodeling activities that repress transcription of the targeted retrotransposon and adjacent genes. Our biophysical and structural data show that the tripartite motif (TRIM) of KAP1 forms antiparallel dimers, which further assemble into tetramers and higher-order oligomers in a concentration-dependent manner. Structure-based mutations in the B-box 1 domain prevent higher-order oligomerization without significant loss of retrotransposon silencing activity, indicating that, in contrast to other TRIM-family proteins, self-assembly is not essential for KAP1 function. The crystal structure of the KAP1 TRIM dimer identifies the KRAB domain binding site in the coiled-coil domain near the dyad. Mutations at this site abolished KRAB binding and transcriptional silencing activity of KAP1. This work identifies the interaction interfaces in the KAP1 TRIM responsible for self-association and KRAB binding and establishes their role in retrotransposon silencing.

Effect of incubation temperature on the self-assembly of regenerated silk fibroin: A study using AFM

2015 ◽  
Vol 76 ◽  
pp. 195-202 ◽  
Author(s):  
Jian Zhong ◽  
Xunwei Liu ◽  
Daixu Wei ◽  
Juan Yan ◽  
Ping Wang ◽  
...  
Keyword(s):  
Silk Fibroin ◽  
Self Assembly ◽  
Incubation Temperature ◽  
The Self ◽  
Regenerated Silk Fibroin

Self-assembly of regenerated silk fibroin from random coil nanostructures to antiparallel β-sheet nanostructures

Biopolymers ◽  
2014 ◽  
Vol 101 (12) ◽  
pp. 1181-1192 ◽  
Author(s):  
Jian Zhong ◽  
Mengjia Ma ◽  
Wenying Li ◽  
Juan Zhou ◽  
Zhiqiang Yan ◽  
...  
Keyword(s):  
Silk Fibroin ◽  
Self Assembly ◽  
Random Coil ◽  
Regenerated Silk Fibroin ◽  
Β Sheet

scholarly journals Microstructural evolution of regenerated silk fibroin/graphene oxide hybrid fibers under tensile deformation

RSC Advances ◽  
2017 ◽  
Vol 7 (6) ◽  
pp. 3108-3116 ◽  
Author(s):  
Chao Zhang ◽  
Yaopeng Zhang ◽  
Jie Luo ◽  
Jingru Shi ◽  
Huili Shao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Silk Fibroin ◽  
Tensile Deformation ◽  
Strain Curve ◽  
Microstructural Change ◽  
Stress Strain Curve ◽  
Hybrid Fibers ◽  
Proposed Model ◽  
Regenerated Silk Fibroin ◽  
Stretching Deformation

The stress–strain curve and proposed model of microstructural change of silk fibroin/GO hybrid fibers during the stretching deformation.

Preparation and properties of photochromic regenerated silk fibroin/Tungsten trioxide nanoparticles hybrid fibers

2021 ◽  
pp. 100810
Author(s):  
Qiang Ma ◽  
Bo Yang ◽  
HuiHui Li ◽  
JianJun Guo ◽  
ShenQiang Zhao ◽  
...  
Keyword(s):  
Silk Fibroin ◽  
Tungsten Trioxide ◽  
Hybrid Fibers ◽  
Regenerated Silk Fibroin

scholarly journals Ferrocene-Labelled Electroactive Aptamer-Based Sensors (Aptasensors) for Glycated Haemoglobin

Molecules ◽  
2021 ◽  
Vol 26 (23) ◽  
pp. 7077
Author(s):  
Xue-Qing Feng ◽  
Yi Ju ◽  
Wei-Tao Dou ◽  
Qing Li ◽  
Zhong-Gan Jin ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrochemical Sensors ◽  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Glycated Haemoglobin ◽  
Dependent Manner ◽  
Concentration Dependent Manner ◽  
Pulse Voltammetry ◽  
Insight Into

Glycated haemoglobin (HbA1c) is a diagnostic biomarker for type 2 diabetes. Traditional analytical methods for haemoglobin (Hb) detection rely on chromatography, which requires significant instrumentation and is labour-intensive; consequently, miniaturized devices that can rapidly sense HbA1c are urgently required. With this research, we report on an aptamer-based sensor (aptasensor) for the rapid and selective electrochemical detection of HbA1c. Aptamers that specifically bind HbA1c and Hb were modified with a sulfhydryl and ferrocene group at the 3′ and 5′-end, respectively. The modified aptamers were coated through sulfhydryl-gold self-assembly onto screen printed electrodes, producing aptasensors with built in electroactivity. When haemoglobin was added to the electrodes, the current intensity of the ferrocene in the sensor system was reduced in a concentration-dependent manner as determined by differential pulse voltammetry. In addition, electrochemical impedance spectroscopy confirmed selective binding of the analytes to the aptamer-coated electrode. This research offers new insight into the development of portable electrochemical sensors for the detection of HbA1c

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