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Synthesis and self-assembly of rod-coil molecules with n-shaped rod building block
Zhong, Ke-Li,Huang, Zhegang,Man, Zhijin,Jin, Long Yi,Yin, Bingzhu,Lee, Myongsoo Wiley Subscription Services, Inc., A Wiley Company 2010 Journal of polymer science Part A, Polymer chemist Vol.48 No.6
<P>The rod-coil molecules with n-shaped rod building block, consisting of an anthracene unit and two biphenyl groups linked together with acetylenyl bonds at the 1,8-position of anthracene as a rigid rod segment, and the alkyl or alkyloxy chains with various length (i.e., methoxy- (1), octyl- (2), hexadecyl- (3)) at the 10-position of anthracene and poly(ethylene oxide) with the number of repeating units of 7 connected with biphenyl as coil segments were synthesized. The molecular structures were characterized by <SUP>1</SUP>H NMR and MALDI-TOF mass spectroscopy. The self-assembling behavior of new type of molecules 1–3 was investigated by means of DSC, POM, and SAXS at the bulk state. These molecules with a n-shaped rod building block segment self-assemble into supramolecular structures through the combination of π–π stacking of rigid rod building blocks and microphase separation of the rod and coil blocks. SAXS studies reveal that molecules 1 and 2 show hexagonal columnar and rectangular columnar structures in the liquid crystalline phase, respectively; meanwhile, molecules 1–3 self-organize into lamellar structures in the crystalline state. In addition, self-assembling studies of molecules 1–3 by DLS and TEM indicated that these molecules self-assemble into elongated nanofibers in aqueous medium. © 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 1415–1422, 2010</P> <B>Graphic Abstract</B> <P>Rod-coil molecules with n-shaped rod building block were successfully synthesized. In the melt state, molecule with a methoxy group at 10 position of anthracene self-assembles into hexagonal columnar structure, Whereas molecule with an octanyl group at 10 position of anthracene self-organizes into rectangular columnar structure. Further increasing the length of alkyl chain suppresses a liquid crystalline phase and exhibits only a lamellar structure in the solid state. In aqueous medium, these molecules can self-assemble into elongated nanofiber structure with a radial aggregation of aromatic segments. <img src='wiley_img/0887624X-2010-48-6-POLA23909-gra001.gif' alt='wiley_img/0887624X-2010-48-6-POLA23909-gra001'> </P>
Ke Ding,Yu Long Zhang,Zhong Yang,Jian Zhong Xu 한국생물공학회 2013 Biotechnology and Bioprocess Engineering Vol.18 No.1
Chitosan/β-glycerophosphate/collagen (C/GP/Co)is a promising injectable scaffold in the bone tissue engineering. In this study, we prepared this scaffold and evaluated its biocompatibility and effects on the osteogenic differentiation of mesenchymal stem cells (MSCs). After fabrication, the C/GP/Co hydrogel was examined in a scanning electron microscope (SEM) and showed a porous microstructure. Its biocompatibility was assessed by cell morphology and cell viability assays. Cell morphological observations were performed by fluorescent microscope in 2D cultivation and by laser confocal scanning microscope (LCSM) in 3D cultivation, respectively. Cell viability in 2D and that in 3D cultivation were both evaluated by the Cell Counting Kit-8 (CCK-8) assay. Its effect on osteogenic differentiation of MSCs in vitro was clarified by alkaline phosphatase (ALP) activity, Alizarin Red staining, and real-time polymerase chain reaction (Real-time PCR). An additional experiment of the ectopic bone formation in nude mice was conducted to investigate its effects on osteogenic differentiation of MSCs after subcutaneous injection. The results proved that C/GP/Co hydrogel exhibited good biocompatibility and enhanced the in vitro osteogenic differentiation of MSCs. In the experiment of ectopic bone formation, this hydrogel demonstrated its capability of supporting neovascularization and differentiation of MSCs toward osteogenic lineage. Therefore, C/GP/Co hydrogel scaffold holds a great promise for the bone tissue engineering applications.
Ke-li Zhong,Chunchang Yang,Bingzhu Yin,Long Yi Jin,Zhegang Huang,이은지 한국고분자학회 2010 Macromolecular Research Vol.18 No.3
An aromatic amphiphilic molecule consisting of three biphenyl groups and one styrene unit linked together with ether bonds as a rigid rod segment, and poly(ethylene oxide) with 17 repeating units as a coil segment was synthesized and its self-assembly behavior in the bulk state and aqueous solution was examined by DSC, X-ray scattering, DLS and TEM. This molecule based on a rod building block self-assembles into lamellar or hexagonal perforated layer (HPL) structures in the crystalline phase or liquid crystalline mesophase. In an aqueous medium,the molecule self-assembles into cylindrical aggregates and can be used as a supramolecular reactor for the Suzuki coupling reaction.
A New Technology of Anti-corrosive of Metals in Atmospheric Environment
Zhong, Chen Ke 한국부식방식학회 2003 Corrosion Science and Technology Vol.2 No.4
In this paper, a newest kind of anti-atmospheric corrosion method is introduced. This method does not adopt organic coating, plastic layer or metal plating, instead it adopts a kind of aqueous emulsion containing numerous fine solid compounds that are absorbed onto the component surface, which play the role of anti-electrochemical corrosion.
Cough Inhibition Activity of Schisandra chinensis in Guinea Pigs
Shan Zhong,Li-Ping Bai,Xiao-Dong Liu,Die-Yi Cai,Lee-Fong Yau,Chu-Qin Huang,Jia-Qi Zhang,Ke-Fang Lai,Nan-Shan Zhong 한국식품영양과학회 2021 Journal of medicinal food Vol.24 No.4
Chronic cough is very common in respiratory clinics, and no effective drugs are available. Schisandra chinensis (Turcz.) Baill. (S. chinensis), an important traditional Chinese medicine, has been extensively prescribed for patients with a persistent cough. Preliminary research indicated that 95% ethanol extracts (EE) of S. chinensis showed remarkable antitussive activity in guinea pigs exposed to cigarette smoke (CS). To find out the antitussive ingredients of S. chinensis, EE was divided into four fractions according to the polarity: petroleum ether extract (PEE), ethyl acetate extract (ECE), n-butyl alcohol extract, and residue extract. The antitussive, antioxidant, and anti-inflammatory effects of the four fractions were evaluated in a guinea pig model of cough hypersensitivity induced by CS exposure. Eighteen main constituents of the two effective fractions, PEE and ECE, were identified using ultra-high-pressure liquid chromatography electronic spray ion time-of-flight mass spectrometry. The cough inhibition activities of compound 1, 3, 9, 10, 17 were evaluated on citric acid induced acute cough guinea pigs. The results showed that the antitussive activity of EE was almost all contained in PEE and ECE. The 16 major peaks in PEE were identified as 15 lignans (1–12 and 14–16) and 1 triterpene (compound 13), and 3 major peaks (1, 17, and 18) in ECE were also identified as lignans. Three doses of five compounds brought about a significant decrease in number of cough efforts (P < .01), and the cough inhibition rates were between 40.9% and 85.1%. Therefore, lignans are the antitussive ingredients of S. chinensis.
Wavelet Multiresolution Complex Network for Analyzing Multivariate Nonlinear Time Series
Gao, Zhong-Ke,Li, Shan,Dang, Wei-Dong,Yang, Yu-Xuan,Do, Younghae,Grebogi, Celso World Scientific 2017 International journal of bifurcation and chaos in Vol.27 No.8
<P>Characterizing complicated behavior from time series constitutes a fundamental problem of continuing interest and it has attracted a great deal of attention from a wide variety of fields on account of its significant importance. We in this paper propose a novel wavelet multiresolution complex network (WMCN) for analyzing multivariate nonlinear time series. In particular, we first employ wavelet multiresolution decomposition to obtain the wavelet coefficients series at different resolutions for each time series. We then infer the complex network by regarding each time series as a node and determining the connections in terms of the distance among the feature vectors extracted from wavelet coefficients series. We apply our method to analyze the multivariate nonlinear time series from our oil-water two-phase flow experiment. We construct various wavelet multiresolution complex networks and use the weighted average clustering coefficient and the weighted average shortest path length to characterize the nonlinear dynamical behavior underlying the derived networks. In addition, we calculate the permutation entropy to support the findings from our network analysis. Our results suggest that our method allows characterizing the nonlinear flow behavior underlying the transitions of oil-water flows.</P>