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( Tian Zhou Liu ),( Bang Xing Wang ),( Jin Tao Guo ),( Yang Zhou ),( Mugweru Julius ),( Moses Njire ),( Yuan Yuan Cao ),( Tian Wu ),( Zhi Yong Liu ),( Chang Wei Wang ),( Yong Xu ),( Tian Yu Zhang ) 한국미생물 · 생명공학회 2015 Journal of microbiology and biotechnology Vol.25 No.9
The combination of trimethoprim (TMP) and sulfamethoxazole (SMX) has been shown to be active against Mycobacterium tuberculosis (Mtb) in clinical tuberculosis (TB) treatment. However, the mechanism of action of TMP-SMX against Mtb is still unknown. To unravel this, we have studied the effect of TMP and SMX by deleting the folP2 gene in Mycobacterium smegmatis (Msm), and overexpressing the Mtb and Msm folP1/2 genes in Msm. Knocking out of the folP2 gene in Msm reduced the minimum inhibitory concentration of SMX 8-fold compared with wild type. Overexpression of the folP1 genes from Mtb and Msm increased the MICs by 4- and 2-fold in Msm for SMX and TMP, respectively. We show a strong correlation between the expression of folP1 and folP2 genes and TMP-SMX resistance in mycobacteria. This suggests that a combination of FolP2 inhibitor and SMX could be used for TB treatment with a better outcome.
( Yong-sheng Tian ),( Jing Xu ),( Lei-chen ),( Xiao-yan Fu ),( Ri-he Peng ),( Quan-hong Yao ) 한국미생물생명공학회(구 한국산업미생물학회) 2017 Journal of microbiology and biotechnology Vol.27 No.10
Thermostability is an important property of xylanase because high temperature is required for its applications, such as wood pulp bleaching, baking, and animal feedstuff processing. In this study, XynB from Thermobacillus composti, a moderately thermophilic gram-negative bacterium, was modified via site-directed mutagenesis (based on its 3D structure) to obtain thermostable xylanase, and the properties of this enzyme were analyzed. Results revealed that the half-life of xylanase at 65°C increased from 10 to 50 min after a disulfide bridge was introduced between the α-helix and its adjacent β-sheet at S98 and N145. Further mutation at the side of A153E named XynB-CE in the C-terminal of this α-helix enhanced the half-life of xylanase for 60 min at 65°C. Therefore, the mutant may be utilized for industrial applications.
FINDING THE ACCELERATION PARAMETER IN MODIFIED NEWTONIAN DYNAMICS WITH ELLIPTICAL GALAXIES
TIAN, YONG,KO, CHUNG-MING The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
MOdified Newtonian Dynamics (MOND) is an alternative to the dark matter paradigm. MOND asserts that when the magnitude of acceleration is smaller than the acceleration parameter $a_0$, the response of the system to gravity is stronger (larger acceleration) than the one given by Newtonian dynamics. The current value of $a_0$ is obtained mostly by observations of spiral galaxies (rotation curves and the Tully-Fisher relation). We attempt to estimate $a_0$ from the dynamics of elliptical galaxies. We seek elliptical galaxies that act as the lens of gravitational lensing systems and have velocity dispersion data available. We analysed 65 Einstein rings from the Sloan Len ACS survey (SLACS). The mass estimates from gravitation lensing and velocity dispersion agree well with each other, and are consistent with the estimates from population synthesis with a Salpeter IMF. The value of $a_0$ obtained from this analysis agrees with the current value.
Yong Tian,Bizhong Xia,Zhihui Xu,Wei Sun 전력전자학회 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
The power?voltage (P?V) characteristic of a photovoltaic (PV) array is nonlinear and time varying with the change in atmospheric conditions. As a result, the maximum power point tracking (MPPT) technique must be applied in PV systems to maximize the generated energy. The incremental conductance (INC) algorithm, one of the MPPT strategies, is widely used for its high tracking accuracy, good adaptability to rapidly changing atmospheric conditions, and easy implementation. This paper presents a modified asymmetrical variable step size INC MPPT method that is based on the asymmetrical feature of the P?V curve. Compared with conventional fixed or variable step size method, the proposed method can effectively improve tracking accuracy and speed. The theoretical foundation and design principle of the proposed approach are validated by the simulation and experimental results.
DYNAMICS OF ELLIPTICAL GALAXIES IN THE FRAMEWORK OF MODIFIED NEWTONIAN DYNAMICS
TIAN, YONG,KO, CHUNG-MING The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
Planetary nebula in elliptical galaxies pose a problem in dark matter theory. Using data from the Planetary Nebula Spectrograph (PN. S), Romanowsky et al. (2003) reported that less dark matter than expected was found within 5 to 6 effective radii of three elliptical galaxies. We attempt to explain similar observations of elliptical galaxies with MOdified Newtonian Dynamics (MOND). We collect 16 elliptical galaxies with planetary nebulae from the public web data of PN. S. We investigate the dynamical behavior by analyzing the line-of-sight velocity dispersion in the framework of MOND.
Stereoselective Synthesis of L-threo-Sphingosine, L-threo-Sphinganine, D-threo-Sphingosine,,,,
Yong-Shou Tian,Jae-Eun Joo,Van-Thoai Pham,Kee-Young Lee,Won-Hun Ham 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.2
In this study, we explored a convenient and concise route for synthesis of L-threo-sphingosine, D-threo-sphingosine, L-threo-sphinganine and D-threo-sphinganine from commercially available L- or D-serine. The key steps are the simple preparation of trans-oxazoline and intermolecular olefin cross metathesis.
Tian, Yong-Shou,Joo, Jae-Eun,Pham, Van-Thoai,Lee, Kee-Young,Ham, Won-Hun 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.2
In this study, we explored a convenient and concise route for synthesis of L-threo-sphingosine, D-threo-sphingosino, L-threo-sphinganine and D-threo-sphinganine from commercially available L- or D-serine. The key steps are the simple preparation of trans-oxazoline and intermolecular olefin cross metathesis.
Radiation Hybrid Mapping and mRNA Expression of Chicken N- myc downregulated gene 4
Yong Tian,Li Zhi Lu,Yan Fu,Ai Ping Yuan,Guo Qin Li,Qing Yan Yuan,Zheng Rong Tao,Jin Zhao 한국유전학회 2007 Genes & Genomics Vol.29 No.4
N-myc downregulated gene 4 (NDRG4) is a member of the N-myc downregulated gene family which belongs to the alpha/beta hydrolase superfamily. The protein encoded by this gene is a cytoplasmic protein that may be involved in the regulation of mitogenic signalling in vascular smooth muscle cells. To map NDRG4 gene in chicken chromosome, a 6,000 rads chicken- hamster radiation hybrid panel was used. Primers were designed according to the published human sequence for amplification of chicken NDRG4. We compared the corresponding human mRNA sequence with the predicted coding sequence of chicken NDRG4, and found that the assembled contig shared a high percentage of similarity with that of human gene. PCR of samples from ChickRH6 revealed the locations of NDRG4 to be linked to the maker PARD6G (5 cR away) with a LOD score 20.46. In addition, we detected the mRNA expression and distribution of chicken NDRG4 in various tissues by RT-PCR, and found that NDRG4 was highly expressed in chicken brain and heart, whereas lowly but detectable in thymus. The mRNA expression of this gene in chicken liver, spleen, lung and muscle was rarely detectable under present experimental conditions.
Tian, Yong,Xia, Bizhong,Xu, Zhihui,Sun, Wei The Korean Institute of Power Electronics 2014 JOURNAL OF POWER ELECTRONICS Vol.14 No.1
The power-voltage (P-V) characteristic of a photovoltaic (PV) array is nonlinear and time varying with the change in atmospheric conditions. As a result, the maximum power point tracking (MPPT) technique must be applied in PV systems to maximize the generated energy. The incremental conductance (INC) algorithm, one of the MPPT strategies, is widely used for its high tracking accuracy, good adaptability to rapidly changing atmospheric conditions, and easy implementation. This paper presents a modified asymmetrical variable step size INC MPPT method that is based on the asymmetrical feature of the P-V curve. Compared with conventional fixed or variable step size method, the proposed method can effectively improve tracking accuracy and speed. The theoretical foundation and design principle of the proposed approach are validated by the simulation and experimental results.