http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Synthesis of methoxybenzoflavones and assignments of their NMR data
Hwang, Doseok,Jo, Geunhyeong,Hyun, Jiye,Lee, Sung Dae,Koh, Dongsoo,Lim, Yoongho John Wiley Sons, Ltd 2012 Magnetic resonance in chemistry Vol.50 No.1
<P>A phytotoxic root exudate from <I>Acroptilon repens</I> was identified as 7,8‐benzoflavone, an inhibitor of cytochrome P450 1A2 and activator of cytochrome P450 3A4. The synthetic 5,6‐benzoflavone also is a potent phytotoxin. Six 7,8‐benzoflavones and eight 5,6‐benzoflavones were synthesized in this study. The NMR data for a few of these compounds have been previously reported; however, the NMR data for most of them have not been reported. For reference purposes, the complete NMR data for the 14 benzoflavones are described. Copyright © 2012 John Wiley & Sons, Ltd.</P>
Synthesis and complete assignment of NMR data of 20 chalcones
Hwang, Doseok,Hyun, Jiye,Jo, Geunhyeong,Koh, Dongsoo,Lim, Yoongho John Wiley Sons, Ltd. 2011 Magnetic resonance in chemistry Vol.49 No.1
<P><B>Abstract</B></P><P>Chalcones, intermediates in flavonoid biosynthesis, can exhibit antibacterial, antiproliferative, and anti‐inflammatory properties. Chalcones contain two benzene rings and both hydroxylated and methoxylated analogs are frequently produced by hydroxylases and <I>O</I>‐methyltransferases in plant biosynthetic pathways. Assignments of NMR peaks in the spectra of hydroxylated and/or methoxylated chalcones can help in identifying novel chalcone derivatives isolated from natural sources by referencing these data against NMR spectra obtained from known chalcones. We report here the syntheses of 20 chalcones and complete assignments of <SUP>1</SUP>H and <SUP>13</SUP>C NMR spectra. Copyright © 2010 John Wiley & Sons, Ltd.</P>
A Peptide Produced by Pseudomonas tolaasi, Tolaasin Binds to Metal Ions
Geunhyeong Jo,Doseok Hwang,Yoonkyung Woo,Younggiu Lee,Yeonjoong Yong,강경래,Jiye Hyun,Young-Kee Kim,Dong-Woon Kim,Yoongho Lim 한국응용생명화학회 2011 Applied Biological Chemistry (Appl Biol Chem) Vol.54 No.4
Brown blotch disease in mushrooms is caused by Pseudomonas tolaasin, which produces a peptide toxin, tolaasin I, and zinc ion inhibits the channel formed by tolaasin I. NMR experiments revealed that zinc, sodium, and calcium ions can bind to tolaasin I and their binding position on tolaasin I is the lactone ring.
Jo, Geunhyeong,Hyun, Jiye,Hwang, Doseok,Lee, Young Han,Koh, Dongsoo,Lim, Yoongho John Wiley Sons, Ltd. 2011 Magnetic resonance in chemistry Vol.49 No.6
<P><B>Abstract</B></P><P>Resveratrol is a polyphenol isolated from many natural sources including grapes, mulberries, eucalyptus, spruce, lilies, and peanuts. The hydroxyl groups in polyphenols can be substituted with various functional groups, allowing production of multiple derivatives. NMR spectroscopy is used to identify new derivatives. Since the complete NMR data of the known derivatives can be useful for identification of the newly isolated derivatives, here, we report the synthesis of 14 methoxylated stilbenes and four 1,2‐diphenylethanes and their NMR data. Copyright © 2011 John Wiley & Sons, Ltd.</P>
Conversion of Flavonoids and Their Conformation by NMR and DFT
Yong, Yeonjoong,Shin, Soon Young,Hwang, Doseok,Ahn, Seunghyun,Koh, Dongsoo,Lim, Yoongho The Korean Society for Applied Biological Chemistr 2014 Applied Biological Chemistry (Appl Biol Chem) Vol.57 No.5
Wide range of various biological activities of chalcones motivated the syntheses of three chalcone derivatives. The conversion to flavanones was confirmed by $^1H$-nuclear magnetic resonance (NMR) spectral data. The reason for the aforesaid conversion was elucidated based on the potential energy values of the derivatives, calculated using the density functional theory based on the Hatree-Fock method with B3LYP functional and the $6-31G^*$ basis set. The rate constants of the derivatives were obtained from the NMR data, and the relevant transition states were considered to explain the relationship between the rate constants and the potential energy differences. These findings can help us predict the molecular stabilities of flavonoids, including chalcones and flavanones, using density functional theory calculations.
Chae, Soo Sang,Min, Haesik,Lee, Jeong Hun,Hwang, Byounghar,Sung, Woong Mo,Jang, Woo Soon,Yoo, Young Bum,Oh, Jinyoung,Park, Jee Ho,Kang, Daeseung,Kim, Doseok,Kim, Youn Sang,Baik, Hong Koo WILEY‐VCH Verlag 2013 ADVANCED MATERIALS Vol.25 No.10
<P><B>A compartmentalized multidomain alignment state</B> of a layer of liquid crystal display is achieved using an ultrathin, highly transparent, and ultrafast‐responsive alignment layer fabricated by a simple method. The ultrathin alignment layer consists of a self‐assembled oligomer layer of poly(dimethylsiloxane) (PDMS) formed by utilizing the oligomers that diffuse out from a PDMS elastomer stamp during a contact printing process.</P>