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- 저자 : Wang Yuchang (검색결과 3 건)
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Wang Yuchang,Shen Bingqi,Yang Lin,Wang Dawei 한국식물생명공학회 2022 Plant biotechnology reports Vol.16 No.5
Yunnanopilia longistaminea is a unique flavor forest vegetable that is mainly determined by the vitamins, amino acids and derivatives, and flavonoids detected in its leaves. This experiment applied to broad targeted metabolomics approach based on UPLC-MS/MS to evaluate metabolic changes and the assessment of differential genes by transcriptome sequencing using the IlluminaHiSeq platform between the Y. longistaminea young leaves (YYL) and mature leaves (YML). The present results showed that a total of 488 compounds in the leaves, of which 275 (56.53%) significantly changed metabolites (SCMs). Compared to young leaves, the abundance of 163 SCMs was down-regulated and 112 SCMs were significantly increased in mature leaves. The results show that flavonoids, amino acids and derivatives, coumarins, nucleotides and derivatives, vitamins, saccharides and alcohol, tannin, and organic acids were significantly downregulated in mature leaves, whereas mature leaves had higher lipids and alkaloids than young leaves. A total of 2082 DEGs were identified, with 939 down- regulated genes and 1143 up-regulated genes in mature leaves compared to young leaves. The experimental work presented here provides the first investigations into Y. longistaminea with metabolic group and transcriptome. This study will prove useful in expanding our understanding of how to analyze biosynthesis at the molecular level, which will encourage further utilization of the Y. longistaminea and its relevant forest vegetables.
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Tian, Fengshou,Chen, Han,Du, Yuchang,Chen, Junhui,Wang, Xiaohong,Lu, Hongbo,Cho, Kilwon,Zhang, Guobing,Qiu, Longzhen The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.37
<P>Achieving good electrical properties and ductility of polymer semiconductors has always been challenging. In this work, a series of isoindigo derivative-based conjugated polymers was studied in an effort to gain a better understanding of the influence of polymer main and side chain structures on their electrical and mechanical properties. The results suggested that the introduction of alkyl side chains onto the donors can significantly enhance the mechanical properties of isoindigo-based polymers; however, the electrical properties of the films greatly deteriorated due to the large steric hindrance by the chain. The insertion of strong electron-withdrawing units, such as benzodifurandione, into the isoindigo chain during the synthesis of a bis(2-oxoindolin-3-ylidene)-benzodifuran-dione (BIBDF)-based polymer (PBIBDF-BT) significantly boosted the electrical properties of the films without decreasing their mechanical properties. The crack onset in PBIBDF-BT thin films was observed at 50% tensile strain. In addition, PBIBDF-BT thin films exhibited bipolar transport properties with both electron and hole mobilities greater than 0.1 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP> at 100% strain. It is found that the improvement of PBIBDF-BT performance is attributed to its proper molecular structure. The long alkyl side chains significantly increase the ductility of PBIBDF-BT thin films, and the strong electron-withdrawing BIBDF unit in the main chains enhances the local aggregation, resulting in a significant increase in mobility. These results indicate that the mechanical and electrical properties of conjugated polymers could simultaneously be improved through reasonable molecular design.</P>
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Huang, Kaiqiang,Zhao, Xue,Du, Yuchang,Kim, Sanghyo,Wang, Xiaohong,Lu, Hongbo,Cho, Kilwon,Zhang, Guobing,Qiu, Longzhen The Royal Society of Chemistry 2019 Journal of Materials Chemistry C Vol.7 No.25
<P>Six donor-acceptor (D-A) conjugated polymers, P1-P6, based on the novel electron acceptors bis-isoindigo (BIID) and bis-azaisoindigo (BAID), were designed and synthesized for solution-processed organic field-effect transistors with high-performance optical and electrical properties. Energy level regulation was achieved by incorporation of nitrogen and fluorine heteroatoms and side chain optimization to reduce side chain density and extend branching point positions. Both the hole (<I>μ</I>h) and electron mobilities (<I>μ</I>e) significantly increased from P1 to P6, and there was an obvious transition from hole-dominated ambipolar charge transport behavior to highly-balanced ambipolar behavior. Since aza-substitution strengthened the electron-deficient property of the acceptor units, the entire molecular skeleton of BAID-based polymers has a high electron affinity and a low-lying lowest unoccupied molecular orbital (LUMO) level according to ultraviolet photoelectron spectroscopy (UPS) and cyclic voltammetry (CV) measurements. The <I>μ</I>e of BAID-based polymers is an order of magnitude higher than that of BIID-based polymers. In addition, side chain optimization was shown to significantly influence intermolecular interactions and supramolecular self-assembly. The stepwise reduction of the π-π stacking distances of P1-P6 calculated by GIXRD curves supports this conclusion. Finally, in P6 (PBAID3-2FBT), a maximum absorption wavelength (<I>λ</I>max) was observed at 797 nm, a low optical band gap (<I>E</I>g) of 1.27 eV, a low LUMO level of −3.90 eV, and an average <I>μ</I>h and <I>μ</I>e of 1.31 cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. This paper offers an available molecular design strategy to achieve highly-balanced and high-performance ambipolar charge carrier transport D-A conjugated polymers.</P>
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