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- 저자 : Hong-Guan Xie (검색결과 5 건)
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Hong-Guan Xie,Yong-Gang Bao,Li-ping Bai,Jun-Jie Shan,Rong Jiang,Yang Zhang,Lian-Hong Guo,Ren Zhang,Yuan Li 한국미생물학회 2009 The journal of microbiology Vol.47 No.2
Streptomyces sp. 139 generates a novel exopolysaccharide (EPS) designated as Ebosin, which exerts an antagonistic effect on IL-1R in vitro and anti-rheumatic arthritis activity in vivo. A ste gene cluster for Ebosin biosynthesis consisting of 27 ORFs was previously identified in our laboratory. In this paper, ste16 was expressed in Escherichia coli BL21 and the recombinant protein was purified, which has the ability to catalyze the transfer of the methyl group from S-adenosylmethionine (AdoMet) to dTDP-4-keto-6-deoxy-D-glucos, which was thus identified as a methyltransferase. In order to determine the function of ste16 in Ebosin biosynthesis, the gene was disrupted with a double crossover via homologous recombination. The monosaccharide composition of EPS-m generated by the mutant strain Streptomyces sp. 139 (ste16-) was found to differ from that of Ebosin. The IL-1R antagonist activity of EPS-m was markedly lower than that of Ebosin. These experimental results have shown that the ste16 gene codes for a methyltransferase which is involved in Ebosin biosynthesis.
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Optimisation of bridge deck positioning by the evolutionary procedure
Guan, Hong,Steven, G.P.,Querin, O.M.,Xie, Y.M. Techno-Press 1999 Structural Engineering and Mechanics, An Int'l Jou Vol.7 No.6
This paper presents some simple thinking on an age-old question that given a bridge of a certain span and loading, from the point of view of the structural efficiency, where should the bridge deck be positioned? Generally, this decision is made for other reasons than structural efficiency such as aesthetics and the analyst is often presented with a fait accompli. Using the recently invented Evolutional Structural Optimisation (ESO) method, it is possible to demonstrate that having the deck at different vertical locations can lead to a very different mass and shape for each structural form resembling cable-stayed and cable-truss bridges. By monitoring a performance index which is the function of stresses and volume of discretised finite elements, the best optimised structure can be easily determined and the bridge deck positioning problem can be efficiently solved without resorting to any complex analysis procedures.
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Jingsong He,Ni Xie,Jianbo Yang,Hong Guan,Weicai Chen,Huisheng Wu,Zishan Yuan,Kun Wang,Guojin Li,Jie Sun,Limin Yu 한국유방암학회 2014 Journal of breast cancer Vol.17 No.3
Purpose: Synuclein-γ (SNCG), which was initially identified asbreast cancer specific gene 1, is highly expressed in advancedbreast cancers, but not in normal or benign breast tissue. Thisstudy aimed to evaluate the effects of SNCG siRNA-treatmenton breast cancer cells and elucidate the associated mechanisms. Methods: Vectors containing SNCG and negative control(NC) siRNAs were transfected into MDA-MB-231 cells; mRNAlevels were determined by real-time polymerase chain reaction. Cell proliferation was evaluated using the MTT assay, cell migrationwas assessed by the Transwell assay, apoptosis and cellcycle analyses were conducted with the flow cytometer, andWestern blot analysis was performed to determine the relativelevels of AKT, ERK, p-AKT, and p-ERK expression. Results:SNCG mRNA levels were significantly reduced in MDA-MB-231cells transfected with SNCG siRNA. Our results indicate that inSNCG siRNA-treated cells, cell migration and proliferation decreasedsignificantly, apoptosis was induced, and the cell cyclewas arrested. Western blot analysis indicated that the proteinlevels of p-AKT and p-ERK were much lower in the SNCG siRNA-treated groups, than in the control and NC groups. Conclusion:SNCG siRNA could decrease the migration and proliferationof breast cancer cells by downregulating the phosphorylationof AKT and ERK.
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First Report on Bacterial Heart Rot of Garlic Caused by Pseudomonas fluorescens in China
Bin Li,Rong Rong Yu,Shan Hong Yu,Wen Qiu,Yuan Fang,Guan Lin Xie 한국식물병리학회 2009 Plant Pathology Journal Vol.25 No.1
An unreported disease of garlic was observed in commercial fields in Jiangsu province, China. The symptoms started as water soaked lesions at the base of the leaves. Later, water-soaked areas developed on stems and spread to the internal tissues, followed by yellowing and necrosis along leaf edges and soft rot of the stems. The causal organism isolated from symptomatic plants was identified as Pseudomonas fluorescens based on its biochemical and physiological characteristics and confirmed by the cellular fatty acid composition and Biolog data as well as 16S rRNA gene sequence analysis. The bacterial isolates caused similar symptoms when inoculated onto garlic plants. In addition, leek and shallot were susceptible to the P. fluorescens pathogen. However, the P. fluorescens pathogen failed to cause any symptoms when it was inoculated onto 15 other plants. This is the first report of a bacterial disease of garlic caused by P. fluorescens in China.
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First Report on Bacterial Heart Rot of Garlic Caused by Pseudomonas fluorescens in China
Li, Bin,Yu, Rong Rong,Yu, Shan Hong,Qiu, Wen,Fang, Yuan,Xie, Guan Lin The Korean Society of Plant Pathology 2009 Plant Pathology Journal Vol.25 No.1
An unreported disease of garlic was observed in commercial fields in Jiangsu province, China. The symptoms started as water soaked lesions at the base of the leaves. Later, water-soaked areas developed on stems and spread to the internal tissues, followed by yellowing and necrosis along leaf edges and soft rot of the stems. The causal organism isolated from symptomatic plants was identified as Pseudomonas fluorescens based on its biochemical and physiological characteristics and confirmed by the cellular fatty acid composition and Biolog data as well as 168 rRNA gene sequence analysis. The bacterial isolates caused similar symptoms when inoculated onto garlic plants. In addition, leek and shallot were susceptible to the P. fluorescens pathogen. However, the P. fluorescens pathogen failed to cause any symptoms when it was inoculated onto 15 other plants. This is the first report of a bacterial disease of garlic caused by P. fluorescens in China.
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