Self-assembly of multiple stimulus response copolymer by ATRP in different media

2021 ◽  
pp. 1-14
Author(s):  
Xilai Zhou ◽  
Yazhen Wang ◽  
Hanwen Xin ◽  
Shaobo Dong ◽  
Tianyu Lan ◽  
...  
Keyword(s):  
Self Assembly ◽  
Stimulus Response ◽  
Multiple Stimulus

Cross-linked supramolecular polymer metallogels constructed via a self-sorting strategy and their multiple stimulus-response behaviors

2015 ◽  
Vol 51 (94) ◽  
pp. 16813-16816 ◽  
Author(s):  
Xu-Qing Wang ◽  
Wei Wang ◽  
Guang-Qiang Yin ◽  
Yu-Xuan Wang ◽  
Chang-Wei Zhang ◽  
...  
Keyword(s):  
Supramolecular Polymer ◽  
Stimulus Response ◽  
Multiple Stimulus ◽  
External Stimuli ◽  
Response Behaviors

Novel cross-linked supramolecular polymer metallogels were successfully constructed from four components via a self-sorting strategy, and feature interesting multiple stimulus-response behaviors under various external stimuli, including halide, base, and competitive guests.

scholarly journals Synthesis, Self-Assembly and Photoresponsive Behavior of Liquid Crystals Based on Azobenzene

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1560
Author(s):  
Yaming Wu ◽  
Yuhai Liu ◽  
Jianxiang Chen ◽  
Runmiao Yang
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Self Assembly ◽  
Driving Force ◽  
1H Nmr Spectroscopy ◽  
Uv Light ◽  
Light Exposure ◽  
Scanning Calorimetry ◽  
Stimulus Response ◽  
Cis Isomer

A new amphiphilic surfactant (C4-Azo-C5-HDA) was formed by liquid crystals (LCs) based on azobenzene, whose structures were characterized by 1H-NMR spectroscopy. The reversible hydrogelation upon changes in temperature and light exposure was also studied. Under the irradiation of UV light, the trans-isomer of C4-Azo-C5-HDA rapidly photoisomerized to the cis-isomer, resulting in rapid disruption of the gel. The thermotropic liquid crystal behavior of the gelator was investigated via Differential Scanning Calorimetry (DSC) and Polarizing Optical Microscopy (POM). The biocompatibility experiment of multi-stimulus response of the liquid crystal provides a potential driving force for the development of biomaterials.

Rational Design of Multiple-Stimulus-Responsive Materials via Supramolecular Self-Assembly

2015 ◽  
Vol 119 (28) ◽  
pp. 16349-16357 ◽  
Author(s):  
Yanjun Gong ◽  
Tiliu Jiao ◽  
Qiongzheng Hu ◽  
Ni Cheng ◽  
Wenwen Xu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Rational Design ◽  
Responsive Materials ◽  
Multiple Stimulus ◽  
Stimulus Responsive

scholarly journals Why sensory neurons are tuned to multiple stimulus features

2020 ◽  
Author(s):  
Matthew V. Macellaio ◽  
Bing Liu ◽  
Jeffrey M. Beck ◽  
Leslie C. Osborne
Keyword(s):  
Sensory Neurons ◽  
Movement Behavior ◽  
Sensory Stimuli ◽  
Stimulus Response ◽  
Pursuit Eye Movements ◽  
Multiple Stimulus ◽  
Computational Advantage ◽  
Information Advantage ◽  
Stimulus Features ◽  
The Brain

Many sensory neurons encode information about more than one stimulus feature. Multidimensional tuning increases ambiguity in stimulus-response relationships, but we find that it also offers an unexpected computational advantage, allowing the brain to better reconstruct sensory stimuli. From the responses of sensory neurons, populations, and sensory-driven movement behavior, more information can be recovered about a stimulus vector than about its individual components. We term this coding advantage “stimulus synergy” and show that it is distinct from other coding synergies, arising from inseparability of the response-conditioned stimulus distribution along individual stimulus dimensions. From extracellular recordings in motion sensitive cortex and measurements of pursuit eye movements, we demonstrate that stimulus synergy in cortical populations is preserved downstream in the precision of pursuit, and that a common decoding model predicts the level of synergy in pursuit behavior. This suggests that the brain exploits the information advantage afforded by multidimensional sensory tuning.

UV and pH-responsive supra-amphiphiles driven by combined interactions for controlled self-assembly behaviors

Soft Matter ◽  
2018 ◽  
Vol 14 (11) ◽  
pp. 2112-2117 ◽  
Author(s):  
Shangyang Li ◽  
Aiyou Hao ◽  
Jian Shen ◽  
Ningzhao Shang ◽  
Chun Wang
Keyword(s):  
Self Assembly ◽  
Building Blocks ◽  
Ph Responsive ◽  
Stimulus Properties ◽  
Multiple Stimulus

In order to fabricate a novel supra-amphiphile with multiple stimulus properties, we developed the strategy of introducing a bi-functional linker to bridge the hydrophilic and hydrophobic building blocks together, by utilizing more than one kind of interaction.

scholarly journals Mapping the Elicitor and Necrotic Sites of Phytophthora Elicitins with Synthetic Peptides and Reporter Genes Controlled by Tobacco Defense Gene Promoters

1997 ◽  
Vol 10 (6) ◽  
pp. 750-760 ◽  
Author(s):  
Valérie Perez ◽  
Jean-Claude Huet ◽  
Claude Nespoulous ◽  
Jean-Claude Pernollet
Keyword(s):  
Synthetic Peptides ◽  
Plant Pathogens ◽  
Site Directed Mutagenesis ◽  
Gene Promoters ◽  
Defense Gene ◽  
Stimulus Response ◽  
Pathogenesis Related ◽  
Multiple Stimulus ◽  
Glucuronidase Reporter ◽  
Pathogenesis Related Gene

Elicitins are 10-kDa proteins secreted by Phytophthora and Pythium fungi that elicit a hypersensitive-like necrotic reaction, leading to resistance against fungal and bacterial plant pathogens. Induction of necrosis and resistance were previously shown to be borne by different sites of the molecule. Furthermore, sequence comparison indicated several potential residues necessary for necrosis. The role of one of these residues was previously evidenced with site-directed mutagenesis. In order to locate other necrosis-determining sites and reveal the defense-eliciting sites, we synthesized a series of synthetic peptides. Tests were performed on two types of transgenic tobacco plants, both transformed with a construction containing the β-glucuronidase reporter gene, in one case controlled by the promoter of the multiple stimulus response gene str 246C and in the other by the promoter of the pathogenesis-related gene PR1a. We report that only certain peptides were found to be active. Whereas PR1a induction was consistently correlated with induction of necrosis, four peptides were observed to induce only str 246C expression without necrosis, which led to differentiate the defense-eliciting sites from the necrotic sites. From the structure-function relationships thus obtained, two different defense pathways were inferred to be independently induced by elic-itins.

In vitro and in vivo polysaccharides assembly: ultrastructural and cytochemical study of growing plant cell wall components.

1978 ◽  
Vol 36 (2) ◽  
pp. 434-435
Author(s):  
D. Reis ◽  
B. Vian ◽  
J. C. Roland
Keyword(s):  
Cell Wall ◽  
Self Assembly ◽  
Plant Cell Wall ◽  
Higher Plants ◽  
Three Dimensional ◽  
Cytochemical Study ◽  
Wall Components

Wall morphogenesis in higher plants is a problem still open to controversy. Until now the possibility of a transmembrane control and the involvement of microtubules were mostly envisaged. Self-assembly processes have been observed in the case of walls of Chlamydomonas and bacteria. Spontaneous gelling interactions between xanthan and galactomannan from Ceratonia have been analyzed very recently. The present work provides indications that some processes of spontaneous aggregation could occur in higher plants during the formation and expansion of cell wall.Observations were performed on hypocotyl of mung bean (Phaseolus aureus) for which growth characteristics and wall composition have been previously defined.In situ, the walls of actively growing cells (primary walls) show an ordered three-dimensional organization (fig. 1). The wall is typically polylamellate with multifibrillar layers alternately transverse and longitudinal. Between these layers intermediate strata exist in which the orientation of microfibrils progressively rotates. Thus a progressive change in the morphogenetic activity occurs.

The Nature of Rapidly Extracted Phycocyanin from the Blue-Green Alga Plectonema Boryanum

1971 ◽  
Vol 29 ◽  
pp. 366-367
Author(s):  
M. Kessel ◽  
R. MacColl
Keyword(s):  
Self Assembly ◽  
Analytical Ultracentrifugation ◽  
Uranyl Acetate ◽  
The Self ◽  
Major Protein ◽  
Subunit Structure ◽  
Blue Green Alga ◽  
Thin Sections ◽  
Blue Green Algae ◽  
Cacodylate Buffer

The major protein of the blue-green algae is the biliprotein, C-phycocyanin (Amax = 620 nm), which is presumed to exist in the cell in the form of distinct aggregates called phycobilisomes. The self-assembly of C-phycocyanin from monomer to hexamer has been extensively studied, but the proposed next step in the assembly of a phycobilisome, the formation of 19s subunits, is completely unknown. We have used electron microscopy and analytical ultracentrifugation in combination with a method for rapid and gentle extraction of phycocyanin to study its subunit structure and assembly.To establish the existence of phycobilisomes, cells of P. boryanum in the log phase of growth, growing at a light intensity of 200 foot candles, were fixed in 2% glutaraldehyde in 0.1M cacodylate buffer, pH 7.0, for 3 hours at 4°C. The cells were post-fixed in 1% OsO4 in the same buffer overnight. Material was stained for 1 hour in uranyl acetate (1%), dehydrated and embedded in araldite and examined in thin sections.

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