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Wei Tong,Qiang He,Xiao-Qiang Wang,Min-Young Yoon,Won-Hee Ra,Feng Peng Li,Jie Yu,Win Htet Oo,Sun-Kyung Min,Buung Choi,Eun-Beom Heo,Byoung-Kook Yun,Kyu-Won Kim,Tae-Sung Kim,Chang-Yong Lee,Yong-Jin Park 한국육종학회 2015 한국육종학회 심포지엄 Vol.2015 No.07
Although the overall structure of the chloroplast genome is generally conserved, a number of sequence variations have been identified, which are valuable for plant population and evolutionary studies. Here, we constructed a chloroplast variation map of 30 landrace rice strains of Korean origin, using the Oryza rufipogon chloroplast genome (Genbank: NC_017835) as a reference. Differential distribution of single nucleotide polymorphisms (SNPs) and indels across the rice chloroplast genome is suggestive of a region-specific variation. Population structure clustering revealed the existence of two clear subgroups (indica and japonica) and an admixture group (aus). Phylogenetic analysis of the 30 landrace rice strains and six rice chloroplast references suggested and supported independent evolution of O. sativa indica and japonica. Interestingly, two “aus” type accessions, which were thought to be indica type, shared a closer relationship with the japonica type. One hypothesis is that “Korean aus” was intentionally introduced and may have obtained japonica chloroplasts during cultivation. We also calculated the nucleotide diversity of 30 accessions and compared to six rice chloroplast references, which shown a higher diversity in the indica and aus groups than in the japonica group in lower level substitution diversity.
Association study of vitamin E content in rice using whole genome re-sequencing
Xiao-Qiang Wang,Qiang He,Wei Tong,Byung-Kook Yun,Young-Sang Lee,Tae-Sung Kim,Chang-Yong Lee,Yong-Jin Park 한국육종학회 2014 한국육종학회 심포지엄 Vol.2014 No.07
Rice is the major food for half of the world population. The nutrition component in rice is critical for improvement of people’s health. Vitamin E serves as important antioxidant by quenching the free radical intermediates and thus protects the cell membrane. Because of the high nutritional value and the benefits of vitamin E in human health, increasing the tocochromanol content of major agricultural crops has long been in the focus of breeding programs and genetic engineering approaches. The key genes involved in tocopherol biosynthesis have been elucidated in Arabidopsis and other model organisms. Quantitative trait locus (QTL) study performed in Arabidopsis suggested that some of these key genes and a few additional loci contribute to natural tocopherol variations. Identifying such genetic variations in rice, enrich our understanding of the genetic mechanisms controlling tocopherol variation, which can be directly applied to rice breeding programs. In this study, we used genome-wide association mapping with high-resolution density SNPs of rice core set to identify natural allelic variations, which contribute to tocopherol increase in rice
Jin-Wei Yang,Cui Li,Xiao-Peng He,Hong Zhao,Li-Xin Gao,Wei Zhang,Xiao-Xin Shi,Yun Tang,Jia Li,Guo-Rong Chen 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
The incorporation of microwave irradiation with the prevalent “click chemistry” is currently of considerable synthetic interest. We describe here the introduction of such laboratorial shortcut into carbohydrate-based drug discovery,resulting in the rapid formation of a series of triazole-linked salicylic β-D-O-glycosides with biological activities. All “clicked” products were achieved in excellent yields (≈ 90%) within only a quarter. In addition, based on the structural characteristics of the afforded glycomimetics, their inhibitory activities were evaluated toward protein tyrosine phosphatases 1B (PTP1B) and a panel of homologous protein tyrosine phosphatases (PTPs). Docking simulation was also conducted to plausibly propose binding modes of this glycosyl salicylate series with the enzymatic target.
Li, Xiao-Fei,He, Hua-Bin,Zhu, Yan-Shuang,He, Jin-Ke,Ye, Wei-Wei,Chen, Yong-Xin,Lou, Lian-Qing Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.9
The objective of this study was to evaluate the influence of a genetic variant in the multidrug resistance 1 gene (MDR1) on hepatocellular carcinoma (HCC) risk. This case-control study was conducted in a Chinese population of 645 HCC cases and 658 cancer-free controls. The genotype of the c.3751G>A genetic variant in the MDR1 gene was investigated by created restriction site-polymerase chain reaction (CRS-PCR) and DNA sequencing methods. Our data demonstrated significantly differences detected in the allelic and genotypic frequencies between HCC cases and those of cancer-free controls. Association analyses indicated that there were statistically increased risk of HCC in the homozygote comparison (AA versus (vs.) GG: OR=2.22, 95% CI 1.51-3.27, ${\chi}^2$=16.90, P<0.001), dominant model (AA/GA vs. GG: OR=1.25, 95% CI 1.00-1.55, ${\chi}^2$=3.98, P=0.046), recessive model (AA vs. GA/GG: OR=2.14, 95% CI 1.47-3.09, ${\chi}^2$=16.68, P<0.001) and allele comparison (A vs. G: OR=1.33, 95% CI 1.13-1.57, ${\chi}^2$=11.66, P=0.001). The allele-A and genotype-AA may contribute to HCC susceptibility. These preliminary findings suggest that the c.3751G>A genetic variant in the MDR1 gene is potentially related to HCC susceptibility in a Chinese Han population, and might be used as a molecular marker for evaluating HCC susceptibility.
기업특성 및 사외이사 특징이 기업의 부정행위에 미치는 영향 : 중국상장기업을 중심으로
소유하(Wei-He Xiao),백혜원(Hye-Won Paik) 강원대학교 경영경제연구소 2021 Asia-Pacific Journal of Business Vol.12 No.3
Purpose - Our study examines the determinant factors of corporate financial fraud and whether the characteristics of outside directors tend to decrease the fraud in China. Design/methodology/approach - The data come from the enforcement actions of the Chinese Securities Regulatory Commission (CSRC). The multiple regression analysis were hired in order to analyze the data. Findings - Firms that have smaller size, higher debt ratio, or lower return of assets are associated with the incidence of fraud. However, the firms that have a high proportion of outside directors on the board or whose outside directors have a high compensation are less likely to engage in fraud. Our results show that outside directors monitor the actions of managers and thus help deter fraudulent acts. On the other hand, fraud is more associated with the local outside directors rather than outside directors who are from other locations. Since local outside directors tend to be more related with managers of firms, they can lose their independence. Research implications or Originality - Our findings have implications for the design of appropriate outside directors systems for China-listed firms. Moreover, our results imply that recruiting outside directors from other regions can improve the expertise and independence of outside directors in China. Our study contributes to provide more useful information about investors’ investment decisions or management oversight and regulators decisions on audit activities by disclosing information relating to the characteristics of outside directors.
Yang, Jin-Wei,Li, Cui,He, Xiao-Peng,Zhao, Hong,Gao, Li-Xin,Zhang, Wei,Shi, Xiao-Xin,Tang, Yun,Li, Jia,Chen, Guo-Rong Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.11
The incorporation of microwave irradiation with the prevalent "click chemistry" is currently of considerable synthetic interest. We describe here the introduction of such laboratorial shortcut into carbohydrate-based drug discovery, resulting in the rapid formation of a series of triazole-linked salicylic $\beta$-D-O-glycosides with biological activities. All "clicked" products were achieved in excellent yields ($\approx$ 90%) within only a quarter. In addition, based on the structural characteristics of the afforded glycomimetics, their inhibitory activities were evaluated toward protein tyrosine phosphatases 1B (PTP1B) and a panel of homologous protein tyrosine phosphatases (PTPs). Docking simulation was also conducted to plausibly propose binding modes of this glycosyl salicylate series with the enzymatic target.
( Wei Bing Zhang ),( Xiao Ling He ),( Hong Na Liu ),( Hui Yuan Guo ),( Fa Zheng Ren ),( Wei Dong Gao ),( Peng Cheng Wen ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.8
In this paper, two statistical methods were applied to optimize medium components to improve the production of the milk-clotting enzyme by Bacillus amyloliquefaciens D4. First, wheat bran juice, skim milk powder, and Na2HPO4 were shown to have significant effects on D4 enzyme production using the Plackett?Burman experimental design. Subsequently, an optimal medium was obtained using the Box?Behnken method, which consisted of 3.31 g/l of skim milk powder, 5.0 g/l of sucrose, 0.1 g/l of FeSO4?7H2O, 0.1 g/l of MgSO4?7H2O, 0.1 g/l of MnSO4?2H2O, 0.1 g/l of ZnSO4?7H2O, 1.52 g/l of Na2HPO4, and 172.45 g/l of wheat bran juice. With this optimal medium, the milk-clotting enzyme production was remarkably enhanced. The milk-clotting enzyme activity reached 3,326.7 SU/ml after incubation of 48 h, which was 1.76-fold higher than that of the basic medium, showing that the Plackett?Burman design and Box?Behnken response surface method are effective to optimize medium components, and B. amyloliquefaciens D4 possessed a high rennet-producing capacity in the optimal medium.
( Wei Li ),( Han Fan ),( Chao He ),( Xuecheng Zhang ),( Xiaotang Wang ),( Jing Yuan ),( Zemin Fang ),( Wei Fang ),( Yazhong Xiao ) 한국미생물 · 생명공학회 2016 Journal of microbiology and biotechnology Vol.26 No.11
A novel α-glucoside hydrolase (named PspAG97A) from glycoside hydrolase family 97 (GH97) was cloned from the deep-sea bacterium Pseudoalteromonas sp. K8, which was screened from the sediment of Kongsfjorden. Sequence analysis showed that PspAG97A belonged to GH97, and shared 41% sequence identity with the characterized α-glucosidase BtGH97a. PspAG97A possessed three key catalytically related glutamate residues. Mutation of the glutamate residues indicated that PspAG97A belonged to the inverting subfamily of GH97. PspAG97A showed significant reversibility against changes in salt concentration. It exhibited halophilic ability and improved thermostability in NaCl solution, with maximal activity at 1.0 M NaCl/KCl, and retained more than 80% activity at NaCl concentrations ranging from 0.8 to 2.0 M for over 50 h. Furthermore, PspAG97A hydrolyzed not only α-1,4-glucosidic linkage, but also α-1,6- and α-1,2-glucosidic linkages. Interestingly, PspAG97A possessed high catalytic efficiency for long-chain substrates with α-1,6-linkage. These characteristics are clearly different from other known α-glucoside hydrolases in GH97, implying that PspAG97A is a unique α-glucoside hydrolase of GH97.
( Xiao Juan Xing ),( Yong Sheng Tian ),( Ri He Peng ),( Jing Xu ),( Wei Zhao ),( Quan Hong Yao ),( Sheng Sun ) 한국미생물 · 생명공학회 2014 Journal of microbiology and biotechnology Vol.24 No.10
Although a large number of AroA enzymes (EPSPS: 5-enopyruvylshikimate-3-phosphate synthase) have been identified, cloned, and tested for glyphosate resistance, only two AroA variants, derived from Agrobacterium tumefaciens strain CP4 and Zea mays, have been utilized to produce the commercial glyphosate-resistant crops. Here, we have used a PCR-based twostep DNA synthesis method to synthesize an aroA gene (aroAA. metalliredigens) from Alkaliphilus metalliredigens, encoding a new EPSPS. Furthermore, transgenic Arabidopsis with the new aroAA. metalliredigens gene was obtained to confirm the potential of the novel aroA gene in developing glyphosate-resistant crops.
Wettability contrast on the surface of CuO nanostructures for highly efficient fog harvesting
He Wen-xin,Jin Lian-lian,Ma Xiu-jia,Li Xiao,Li Jia,Wang Xue-wei 한국물리학회 2023 Current Applied Physics Vol.53 No.-
Fog collection can provide a sustainable and efficient method for solving the shortage of water resources. In this article, CuO nanostructures were designed and synthesized on the Cu mesh by a one-step oxidation method and used to collect water from fog. Their morphology and surface wettability are characterized through scanning electron microscopy and dynamic contact angle measuring device, while the process of fog collection is investigated by a high-speed camera. The fog collection efficiency depends on the microstructure of the sample surface, which could be well controlled by adjusting the reaction temperature. Compared with CuO nanoneedles and CuO nanowire clusters, CuO nanosheets promote the rapid falling of liquid droplets, improving the fog harvesting efficiency, which can achieve 3168 mg/cm2 within 120 s. CuO nanosheets have ultra-low adhesion due to high roughness and high air restraint ability, accelerating the transport of water droplets and reducing the re-evaporation of water droplets.