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Rock-salt and helix structures of silver iodides under ambient conditions

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National Science Review 2019年第4期6卷 767-774页

作者： Hongyang Huang Jinying Zhang Yifan Zhang Chengcheng Fu Jialiang Huang Yonghong Cheng Chunming Niu Xinluo Zhao Hisanori Shinohara State Key Laboratory of Electrical Insulation and Power Equipment Center of Nanomaterials for Renewable Energy (CNRE) School of Electrical EngineeringXi'an Jiaotong University Department of Physics Shanghai University Department of Chemistry and Institute for Advanced Research Nagoya University

Many different phase structures have been discovered for silver iodides. The β and γ phases were found to be the most common ones at ambient conditions, while the rock-salt phase was found to be stable under pressures between 400 MPa and 11.3 GPa. Recently, the α phase was demonstrated to be stable under ambient conditions when the particle sizes were reduced to below 10 nm. However, no other phase has been reported to be stable for silver iodides under ambient conditions. Rock-salt and helix structures have been found to be stable under ambient conditions in this study. The structures have been characterized by elemental mapping, Raman scattering, and high-resolution transmission electron microscopy. The stabilities of these structures were also confirmed by molecular dynamics and density functional theory.

关键词： carbon nanotubes silver iodides rock salt helix ambient conditions

Supramolecular Polymerization Driven by the Dimerization of Single-stranded helix to Double-stranded helix

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Chinese Journal of Polymer Science 2018年第3期36卷 261-261,262-265页

作者： Chao Zeng Chen-Yang Zhang Jun-Yan Zhu Ze-Yuan Dong State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

We reported a type of strong and highly directional non-covalent interactions based on the dimerization of single-stranded helix to double-stranded helix that can achieve supramolecular polymerization, giving rise to ... 详细信息

关键词： helix Double-stranded helix Supramolecular polymers Supramolecular polymerization Dimerization

Halogen bonding-driven formation of supramolecular macrocycles and double helix

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Chinese Chemical Letters 2019年第5期30卷 953-956页

作者： Chuan-Zhi Liu Satish Koppireddi Hui Wang Dan-Wei Zhang Zhan-Ting Li Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM) Fudan University

The crystal structures of three intramolecularly hydrogen bonded rigid aromatic amide derivatives,which all bear one iodine atom at one end as the donor and one pyridine unit at the other end as the acceptor,have been described to reveal the utility of halogen bonding in inducing the formation of supramolecular *** the three compounds formed intermolecular I···N halogen *** short compound 1,halogen bonding induced the formation of an extended supramolecular *** longer folded compounds 2 and 3,halogen bonding could hold two molecules to form supramolecular macrocycles even by adopting a highly distorted,energetically less favorable conformation(for 3).Depending on the solvent for the growth of crystals,compound 3 could also gave rise to a halogen bonded supramolecular double helix.

关键词： Halogen bond Hydrogen bond Macrocycle Foldamer Double helix

The basic helix-loop-helix transcription factor TabHLH1 increases chlorogenic acid and luteolin biosynthesis in Taraxacum antungense Kitag

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Horticulture Research 2021年第1期8卷 2756-2769页

作者： Qun Liu Li Li Haitao Cheng Lixiang Yao Jie Wu Hui Huang Wei Ning Guoyin Kai Laboratory for Core Technology of TCM Quality Improvement and Transformation College of PharmacySchool of Pharmaceutical SciencesThe Third Affiliated HospitalZhejiang Chinese Medical UniversityHangzhouZhejiang 310053PR China College of Horticulture Shenyang Agricultural UniversityShenyang 110866China Institute of Botany Jiangsu Province and Chinese Academy of Sciences(Nanjing Botanical Garden Mem.Sun Yat-Sen)Nanjing 210014China College of Traditional Chinese Materia Medica Shenyang Pharmaceutical UniversityShenyang 110016PR China Guangxi Botanical Garden of Medicinal Plants Nanning 530023PR China College of Life Sciences and Engineering Shenyang UniversityShenyang 110044PR China

Polyphenols are the main active components of the anti-inflammatory compounds in dandelion,and chlorogenic acid(CGA)is one of the primary ***,the molecular mechanism underlying the transcriptional regulation of CGA biosynthesis remains ***-CoA:quinate hydroxycinnamoyl transferase(HQT2)is the last rate-limiting enzyme in chlorogenic acid biosynthesis in Taraxacum ***,using the TaHQT2 gene promoter as a probe,a yeast one-hybrid library was performed,and a basic helix-loop-helix(bHLH)transcription factor,TabHLH1,was identified that shared substantial homology with Gynura bicolor DC *** TabHLH1 transcript was highly induced by salt stress,and the TabHLH1 protein was localized in the *** and luteolin concentrations in TabHLH1-overexpression transgenic lines were significantly higher than those in the wild type,while CGA and luteolin concentrations in TabHLH1-RNA interference(RNAi)transgenic lines were significantly *** real-time polymerase chain reaction demonstrated that overexpression and RNAi of TabHLH1 in *** significantly affected CGA and luteolin concentrations by upregulating or downregulating CGA and luteolin biosynthesis pathway genes,especially TaHQT2,4-coumarate-CoA ligase(Ta4CL),chalcone isomerase(TaCHI),and flavonoid-3′-hydroxylase(TaF3′H).Dual-luciferase,yeast one-hybrid,and electrophoretic mobility shift assays indicated that TabHLH1 directly bound to the bHLH-binding motifs of proTaHQT2 and *** study suggests that TabHLH1 participates in the regulatory network of CGA and luteolin biosynthesis in *** and might be useful for metabolic engineering to promote plant polyphenol biosynthesis.

关键词： HLH luteolin helix

Two New Coordination Polymers Containing Metal-carboxylate helix

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Chinese Journal of Structural Chemistry 2014年第5期33卷 764-770页

作者：李桂连刘广臻辛凌云李晓玲 College of Chemistry and Chemical Engineering Luoyang Normal University

Two novel compounds, {[Cd（nbdc）（bpp）（H2O）]·H2O}n 1 and {[Cd（nbdc）（dpds）-（H2O）]·H2O}n 2（H2nbdc = 4-nitro-1,2-benzenedicarboxylic acid, bpp = 1,3-bis（4-pyridyl）propane and dpds = 4,4ˊ-dipyridyldisulfide）, were solvothermally synthesized and characterized by elemental analysis, IR spectroscopy, thermogravimetric analysis（TGA）, fluorescent analysis and single-crystal X-ray diffraction. Complex 1 is of monoclinic system, space group P21/c with a = 14.4370（17）, b = 8.4090（10）, c = 19.168（2） , β = 104.5050（10）°, V = 2252.8（5） 3, Dc = 1.639 g/cm3, Mr = 555.81, Z = 4, F（000） = 1120, μ = 1.022 mm-1, the final R = 0.0269 and wR = 0.0599 for 16656 observed reflections with I 〉 2σ（I）. 2 is isostructural to 1 with a = 14.4175（11）, b = 8.4737（7）, c = 18.0120（14） , β = 106.7220（10）°, V = 2107.5（3）3, Dc = 1.821 g/cm3, Mr = 577.85, Z = 4, F（000） = 1152, μ = 1.287 mm-1, the final R = 0.0280 and wR = 0.0705 for 15136 observed reflections with I〉 2σ（I）. Both complexes present intimately related structures featuring infinite Cd-carboxylate helix of [CdⅡ（nbdc）（H2O）]n connected by bpp（or dpds） molecule to produce the 2D layer frameworks.

关键词： 1 2-benzenedicarboxylate solvothermal helix

Quasiparticle approach to diffusional atomic scale self-assembly of complex structures: from disorder to complex crystals and double-helix polymers

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npj Computational Materials 2016年第1期2卷 256-264页

作者： Mykola Lavrskyi Helena Zapolsky Armen G Khachaturyan GPM UMR 6634University of RouenSaint-Etienne du RouvrayFrance Department of Materials Science&Engineering Rutgers UniversityPiscatawayNJUSA Department of Materials Science&Engineering University of CaliforniaBerkeleyBerkeleyCAUSA

A self-organisation is an universal phenomenon in nature and,in particular,is highly important in materials *** goal was to develop a new theory that provides a computationally effective approach to this *** this paper a quasiparticle theory of a diffusional self-organisation of atoms in continuum space during the diffusional time scale has been *** became possible due to two novelties,a concept of quasiparticles,fratons,used for a description of dynamic degrees of freedom and model Hamiltonian taking into account a directionality,length and strength of interatomic *** illustrate a predictive power and achievable level of complexity of self-assembled structures,the challenging cases of self-assembling of the diamond,zinc-blende,helix and double-helix structures,from a random atomic distribution,have been successfully *** approach opens a way to model a self-assembling of complex atomic and molecular structures in the atomic scale during diffusional time.

关键词： diffusion helix particle

Regulation of B-1a cells: another novel function of the basic helix-loop-helix transcriptional regulator BHLHE41

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Cellular & Molecular Immunology 2017年第10期14卷 802-804页

作者： Buka Samten The Department of Pulmonary Immunology the University of Texas Health Science CenterTylerTX 75708USA

The basic helix-loop-helix transcription factors e40(BHLHE40)and e41(BHLHE41)were originally discovered as regulators of the proliferation and differentiation of chondrocytes and nerve cells.1–3 Later studies showed that these transcriptional regulators participate in a variety of physiological processes for the maintenance of homeostasis,such as the regulation of endothelial cells,4 adipocytes,5 circadian rhythms,6 and tumor development.7 Interest in the significance of these transcriptional regulators in the immune response was spurred by the finding that the deletion of BHLHE40 leads to abnormal activation of T cells and B cells with resistance to activation induced cell death and accumulation of autoreactive T and B cells resulting in autoimmune diseases in aged animals.

关键词： homeostasis helix diseases

helix Induction to Polysilane Chain Upon Wrapping by Sugar Derivatives and Related Chemistry

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复旦学报（自然科学版） 2007年第5期46卷 618-619页

作者： M.Tanaka T.Sanji Nobu Kato Y.Sato Chemical Resources Laboratory Tokyo Institute of Technology 4259-R1-13 NagatsutaMidori-ku Yokohama 226-8503Japan

1 Results helix induction to polymer chains is an active area of research these days. In most cases,optically-active units are attached to the polymers to induce helical conformation. Scheme 1Since the properties of σ-conjugated polymers like polysilanes are dependent on the conformation of the chain,it is particularly interesting to induce helix to oligo-and polysilanes. We have been working on the helix induction by host-guest complexation with sugar derivatives such as cyclodextrine and *** l...

关键词： polysilane inclusion complex helix supramolecular chemistry

Possibility of “Comet-Like” Transport of Acetylcholine Receptors in Command <i>helix</i>Neurons in Cellular Analog of Habituation

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World Journal of Neuroscience 2014年第2期4卷 133-143页

作者： Arkady S. Pivovarov Galina B. Murzina Denis A. Makhnovsky Mariya S. Tret’yakova Department of Higher Nervous Activity Faculty of Biology Moscow Lomonosov State University Moscow Russia Institute of Higher Nervous Activity and Neurophysiology Russian Academy of Sciences Moscow Russia

The presence of "comet-like" radial transport of acetylcholine receptors by actin microfilaments without the participation of myosin motors in the depression of acetylcholine-induced inward chloric current (ACh-current) in command neurons of defensive behavior of the land snail, helix lucorum, in a cellular analog of habituation was investigated. For that purpose the effects of CK548, CK-636 (inhibitors of actin-related protein complex Arp2/3, whose activation triggers rapid actin polymerization and the formation of the "comet-like" tail on the actinic filament) and wiskostatin (an N-WASP protein inhibitor, activating Arp2/3) on the depression of ACh-current were studied. The attenuation of ACh-current depression was observed upon the addition of CK548. At the same time, CK-636 and wiskostatin irreversibly strengthened the depression of this current and suppressed its spontaneous recovery. The results of CK-548 action and its mathematical modeling allow suggesting the presence of "comet-like" transport of acetylcholine receptors, initiated by Arp2/3 protein complex in receptor endo and exocytosis in command neurons of helix lucorum in a cellular analog of habituation. Irreversible inhibition of vital metabolic processes of the neuron by wiskostatin and CK-636, which lead to the decrease in the level of ATP, could have caused irreversible effects of these blockers on current depression.

关键词： CK-548 CK-636 Wiskostatin Depression of Acetylcholine-Induced Inward Current Command Neurons helix lucorum Cellular Analog of Habituation