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Synthesis and Structural Studies of an Organic Complex and its Association with BSA
Fa-Yan Meng,Jin-Mei Zhu,Li Wang,Xue-Ping Zhong,Li-Xi Liang,Sheng-Rong Yu,Cui-Wu Lin 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.7
The self-assembly of one novel organic complex based on chlorogenic acid (HCA) and 2,2'-bipyridine (2,2'-bipy) has been synthesized and characterized. The complex achieved by hydrogen-bonding interactions,adopted a 1:1 stoichiometry in a solid state. The proton transfer occurred from the carboxyl oxygen to the aromatic nitrogen atom to form salts CA·(2,2'-Hbipy), the 2,2'-Hbipy molecule individually occupies the pseudo-tetragonum that is formed with CA. In this paper, the interactions of CA·(2,2'-Hbipy) with bovine serum albumin (BSA) were studied by fluorescence spectrometry. For CA·(2,2'-Hbipy), HCA and 2,2'-bipy,the average quenching constants for BSA were 2.4384 × 10^4, 4.653 × 10^3, and 3.059 × 10^3 L·mol^−1, respectively. The mechanism for protein fluorescence quenching is apparently governed by a static quenching process. The Stern-Volmer quenching constants and corresponding thermodynamic parameters ΔH, ΔG and ΔS were calculated. The binding constants and the number of binding sites were also investigated. The conformational changes of BSA were observed from synchronous fluorescence spectra.
Research on surface-modification of Nano-TiO₂ by span 60
Fa-Tang Li,Di-Shun Zhao,Qing-Zhi Luo,Rui-Hong Liu,Rong Yin 한양대학교 세라믹연구소 2008 Journal of Ceramic Processing Research Vol.9 No.4
Nano-TiO2 is likely to agglomerate easily because of its high surface energy, which decreases its photocatalytic activity. Also the hydrophilic nature of the TiO2 restricts its usefulness in organic materials and in solution. Nano-TiO2 particles were modified by Span 60 in anhydrous ethanol in this paper. The powders were characterized by Fourier transform infrared (FTIR) and transmission electron microscopy (TEM). The results showed that there were characteristic absorption peaks of Span 60 from the surface of TiO2 nanoparticles and the degree of aggregation of TiO2 particles has been decreased effectively after modification. The surface of TiO2 changed from hydrophilic to hydrophobic. Nano-TiO2 is likely to agglomerate easily because of its high surface energy, which decreases its photocatalytic activity. Also the hydrophilic nature of the TiO2 restricts its usefulness in organic materials and in solution. Nano-TiO2 particles were modified by Span 60 in anhydrous ethanol in this paper. The powders were characterized by Fourier transform infrared (FTIR) and transmission electron microscopy (TEM). The results showed that there were characteristic absorption peaks of Span 60 from the surface of TiO2 nanoparticles and the degree of aggregation of TiO2 particles has been decreased effectively after modification. The surface of TiO2 changed from hydrophilic to hydrophobic.
Isolation, Culture and Identification of Porcine Skeletal Muscle Satellite Cells
Li, Bo-jiang,Li, Ping-hua,Huang, Rui-hua,Sun, Wen-xing,Wang, Han,Li, Qi-fa,Chen, Jie,Wu, Wang-jun,Liu, Hong-lin Asian Australasian Association of Animal Productio 2015 Animal Bioscience Vol.28 No.8
The objective of this study was to establish the optimum protocol for the isolation and culture of porcine muscle satellite cells. Mononuclear muscle satellite cells are a kind of adult stem cell, which is located between the basal lamina and sarcolemma of muscle fibers and is the primary source of myogenic precursor cells in postnatal muscle. Muscle satellite cells are a useful model to investigate the mechanisms of muscle growth and development. Although the isolation and culture protocols of muscle satellite cells in some species (e.g. mouse) have been established successfully, the culture system for porcine muscle satellite cells is very limited. In this study, we optimized the isolation procedure of porcine muscle satellite cells and elaborated the isolation and culture process in detail. Furthermore, we characterized the porcine muscle satellite cells using the immunofluorecence. Our study provides a reference for the isolation of porcine muscle satellite cells and will be useful for studying the molecular mechanisms in these cells.
Fa-YanMeng,Bing-Li Jiang,Cui-Wu Lin,Li Wang,Xiao-He Tan 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
Two new benzimidazolyl-containing complexes have been synthesized by reactions of Cu^II salts and 1,2-bis(benzimidazolyl)benzene (H_2bbbz) with two different dicarboxylate ligands.When phthalate acid (H2pt) was employed as secondary ligand, a 0Dmolecular complex Cu(H_2bbbz)(pt)·(H_2pt) (1)was furnished and when the secondary ligand was instead by a linear bridging ligand of terephthalic acid (H_2tp) a 1D zipper-like coordination polymer [Cu(H_2bbbz)(tp)·2(C_2H_5OH)·H_2O]n (2) was obtained, suggesting the structure-direction effect of the secondary dicarbxylate ligand. The preliminary investigation on the spectral properties of the complexes was also presented.
Two New Bibenzyl Glucosides from Dendrobium chrysotoxum
Fa-Wu Dong,Huai-Rong Luo,Qin-Li Wan,Feng-Qing Xu,Weiwei Fan,Kai-Jin Wang,Ning Li,Jiang-Miao Hu 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.7
Two new bibenzyl glucosides, 3,3',4',5-tetramethoxybibenzyl-4-O-β-D-glucopyranoside (1) and 3,4,4',5- tetramethoxybibenzyl-3'-O-β-D-glucopyranoside (2), together with five known ones, chrysotobibenzyl (3), erianin (4), chrysotoxine (5), gigantol (6) and tristin (7) were isolated from the stems of Dendrobium chrysotoxum. The structures of those compounds were elucidated by extensive spectroscopic analysis. Moreover, compounds 1-7 were assessed for inhibitory activity of two enzymes-AChE (acetylcholine esterase) and BChE (butyrylcholine esterase).
Li Li Han,En Tao Wang,Yang Li Lu,Yong Fa Zhang,Xin Hua Sui,Wen Feng Chen,Wen Xin Chen 한국미생물학회 2009 The journal of microbiology Vol.47 No.3
Adzuki bean (Vigna angularis) is an important legume crop native to China, but its rhizobia have not been well characterized. In the present study, a total of 60 rhizobial strains isolated from eight provinces of China were analyzed with amplified 16S rRNA gene RFLP, IGS-RFLP, and sequencing analyses of 16S rRNA, atpD, recA, and nodC genes. These strains were identified as genomic species within Rhizobium, Sinorhizobium, Mesorhizobium, Bradyrhizobium, and Ochrobactrum. The most abundant groups were Bradyrhizobium species and Sinorhizobium fredii. Diverse nodC genes were found in these strains, which were mainly co-evolved with the housekeeping genes, but a possible lateral transfer of nodC from Sinorhizobium to Rhizobium was found. Analyses of the genomic and symbiotic gene backgrounds showed that adzuki bean shared the same rhizobial gene pool with soybean (legume native to China) and the exotic Vigna species. All of these data demonstrated that nodule formation is the interaction of rhizobia, host plants, and environment characters.
Li, Xiao-Li,Zhou, Fa-Ming,Shangguan, Shou-Qin,Zou, Wen-Qin,Deng, Yan-Qing,Chen, Tao,Chen, Guang-Hui Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.8
Objective: To explore the value of computed tomography (CT) in the differential diagnosis of glioma stroke and simple cerebral hemorrhage. Materials and Methods: A total of 45 patients with glioma stroke and stroke as the initial symptom in our hospital from Jun., 2009 to Oct., 2013 were selected along with 50 individuals with simple cerebral hemorrhage in the same period randomly collected as a control group. The CT results in both groups were analyzed and compared. Results: In the observation group, there were 25 patients with astrocytoma (55.6%), 11 with oligodendroglioma (24.4%), 8 with ependymoma (17.2%) and 1 with glioblastoma multiforma (GBM, 2.22%). Additionally, the major CT manifestation was coexistence of hemorrhage and tumor signs. By comparison, it could be found that the proportions of patients respectively with peripheral edema and space-occupying effect in the observation group were significantly higher than in the control group (P<0.01). Conclusions: Application of CT examination combined with medical history in patients has very important clinical value in the differential diagnosis of glioma stroke and simple cerebral hemorrhage.
Li Shen,Li Rong-Rong,Wang De-Fa,Pan Xiu-Zhen,Guo Hong-Chao 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.5
A Y-shaped eccentrically braced high-strength steel frame is a novel structure. For such structure to exhibit good plastic deformation ability under severe earthquake, the links are made of ordinary steel ( f y ≤ 345 MPa), whereas high-strength steel ( f y ≥ 460 MPa) is used in the frame beam and column to reduce the cross section while ensuring the elasticity of the non-energy consuming component. The new structure has good ductility and energy-dissipating capacity. The response modifi cation factor R is crucial to the performance-based seismic design. For an appropriate and economical seismic design, the R value should be reasonably selected. In the 2016 edition of China's code for Seismic Design of Buildings (GB50011- 2010), it is obviously not reasonable to hide the R concept and adopt a constant value for all structural systems. It is important to study R and C d of a Y-shaped eccentrically braced high-strength steel frame, it can not only improve the structural performance design, but also provide reference for the future, and promotes the application of the structure in seismic areas, which presents excellent seismic performance. Therefore, in this study, structures with diff erent stories (4, 8, 12, and 16 stories) and link lengths (700, 900, and 1100 mm) were designed via the performance-based seismic design method. A static elastic–plastic analysis (Pushover analysis) and an incremental dynamic analysis (IDA) were conducted and the data thus obtained was fi tted to reach the IDA performance curve of the structure. The R and C d value of each prototype were calculated using the capability spectrum method, the number of structural story N and the link length e is considered. The results of the pushover analysis and IDA were compared; the values of each performance coeffi cient obtained can serve as a reference for the performance design of the new structural systems in the future.
Meng, Fa-Yan,Jiang, Bing-Li,Lin, Cui-Wu,Wang, Li,Tan, Xiao-He Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.3
Two new benzimidazolyl-containing complexes have been synthesized by reactions of $Cu^{II}$ salts and 1,2-bis(benzimidazolyl) benzene ($H_2bbbz$) with two different dicarboxylate ligands. When phthalate acid ($H_2pt$) was employed as secondary ligand, a 0D molecular complex Cu$(H_2bbbz)(pt){\cdot}(H_2pt)$ (1)was furnished and when the secondary ligand was instead by a linear bridging ligand of terephthalic acid ($H_2tp$) a 1D zipper-like coordination polymer $[Cu(H_2bbbz)(tp){\cdot}2(C_2H_5OH){\cdot}H_2O]_n$ (2) was obtained, suggesting the structure-direction effect of the secondary dicarbxylate ligand. The preliminary investigation on the spectral properties of the complexes was also presented.