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Chemical constituents from the leaves of Juglans mandshurica
Da Lei Yao,Chang Hao Zhang,Jie Luo,Mei Jin,Ming Shan Zheng,Jiong Mo Cui,손종근,Gao Li 대한약학회 2015 Archives of Pharmacal Research Vol.38 No.4
Two new (1 and 3) and two known diarylheptanoids(2 and 4), along with two tetralones (5 and 6), onenaphthoquinone (7), four phenylpropanoids (8–11), andone phenol (12) were isolated from the leaves of Juglansmandshurica. Their structures were elucidated on the basisof spectral and chemical data. Compounds 2 and 10 arefirstly isolated from this plant and 8 and 12 were isolatedfrom the Juglans genus for the first time. Among thesecompounds, only 7 exhibited moderate cytotoxicitiesagainst cultured MGC-803, A549, K562, and HeLa tumorcell lines with IC50 values of 25.90, 28.60, 39.06,44.90 lM, respectively.
( Da Lei Yao ),( Chang Hao Zhang ),( Jie Luo ),( Mei Jin ),( Ming Shan Zheng ),( Jiong Mo Cui ),( Jong Keun Son ),( Gao Li ) 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
Two new (1 and 3) two known diarylhep-tanoids (2 and 4), along with two tetralones (5 and 6), one naphthoquinone (7), four phenylpropanoids (8-11), and phenol (12) were isolated from the leaves of Juglans mandshurica. Their structures were elucidated on the basis of spectral and chemical data. Compounds 2 and 10 are firstly isolated from this plant and 8 and 12 were isolated from the Juglans genus for the first time. Among these compounds, only 7 cxhibitcd moderate cytotoxicities against cultured Mgc-803, A549, K562, and Hela tumor cell lines with IC50 values of 25.90, 28.60, 39.06, 44.90 LLM, respectively.
( Yao Da Lei ),( Zhang Chang Hao ),( Li Ren ),( Luo Jie ),( Jin Mei ),( Piao Jin Hua ),( Zheng Ming Shan ),( Cui Jiong Mo ),( Son Jong Keun ),( Li Gao ) 영남대학교 약품개발연구소 2015 영남대학교 약품개발연구소 연구업적집 Vol.25 No.-
The present study was designed to isolate and characterize novel chemical constituents of the stem bark of Juglans mandshurica Maxim. (Juglandaceae).The chemical constituents were isolated and purified by various chromatographic techniques. The structures of the compounds were elucidated on the basis of spectral data (1D and 2D NMR, HR-ESI-MS, CD, UV, and IR) and by the comparisons of spectroscopic data with the reported values in the literatures. Two long chain polyunsaturated fatty acids (1 and 2) were obtained and identified as (S)-(8E, 10E)-12-hydroxy-7-oxo-8, 10-octadecadienoic acid (1) and (S)-(8E, 10E)-12-hydroxy-7-oxo-8,10-octadecadienoic acid methyl ester (2). To the best of our knowledge, this is the first report on the isolation and structural elucidation of the two new conjugated ketonic fatty acids from this genus.
Yao, Da Hu,Sun, Kyung Bok,Li, Peng,Lee, Joong Hee Trans Tech Publications 2010 Advanced materials research Vol.123 No.-
<P>The curing reaction of the system bisphenol-A glycidol ether epoxy resin modified by poly (ethylene glycol) (PEO) and flexible amine (D-230) as curing agent has been studied by means of differential scanning calorimetry (DSC) and thermal scanning rheometry. The curing kinetic parameters have been calculated from the non-thermal DSC curve. The kinetic analysis suggests that the two-parameter autocatalytic model is more appropriate to describe the kinetics of the curing reaction of the system. Increasing the PU content leads to an increase in the heat of curing and has a little effect on the kinetic parameters apparent activation energy (Ea), pre-exponential factor (A), and order of the reaction (m and n). The rheological properties were measured by isothermal curing evolution. Introduction of PEO flexible chains delayed the polymerization. It has been confirmed that the introduction of PEO chains in the structure of the epoxy resin increases the mobility of the molecular segment of the epoxy networks and results in the decrease in glass transition temperature.</P>
요대용 ( Da Yong Yao ) 중국어문학회 2012 中國語文學誌 Vol.41 No.-
身爲宋代的文壇巨擘, 陸遊不僅擅長寫詩作文, 且喜塡詞, 對詞學也有精彩論述。根據他留下的序跋、題記等材料, 可見他較爲豊富的詞學思想。他繼承幷發展了自蘇軾以來詩詞合一的觀點, 對詞的源起、創作、評析以及詞與詩的關係等方面, 均有自己的認識和主張。他的詞學思想是他整體文學思想的一部分, 其中有的看似矛盾之處, 其實幷非眞正的違逆, 相互之間亦有理脈可尋。對詞的認識也深刻影響了他的詞體創作, 他在推尊詞體的同時, 對詞的創作也提出了新的看法和要求。他以作詩的方法塡詞, 從理論和實踐兩方面共同推進了詞的發展。 As Chinese famous writer in Song Dynasty, Lu You was good at writing poems, essays and ci. His thought of ci is also wonderful. According to his text materials, we can find his abundant thoughts of ci. Lu You inherited and developed the view, advocated by Su Shi, that poem and ci was the same in essence. He had his own view of ci`s origin, creation, criticism, as well as the relationship between poem and ci. His idea of ci is a part of his whole literary theory. Sometimes his idea of Ci seemed contradictory, but in fact there is no contradiction, and we can satisfactorily explain this problem now. His recognition of ci deeply affected his ci creation. He not only admired ci but also put forward new opinions and requirements on ci creation. He used a method of poem to write ci. From two aspects of theory and practice, he effectively promoted the development of ci.
Study on the Kinetics and Mechanism of Grain Growth during the Thermal Decomposition of Magnesite
Da-xue Fu,Nai-xiang Feng,Yao-wu Wang 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.8
The X-ray line broadening technique was used to calculate the grain size of MgO at 1023, 1123, 1223 K respectively either in CO2 or during the thermal decomposition of magnesites in air as well as in vacuum. By referring to the conventional grain growth equation, Dn = kt, the activation energy and pre-exponential factor for the process in air are gained as 125.8 kJ/mol and 1.56 × 108 nm4/s, respectively. Ranman spectroscopy was employed to study the surface structure of MgO obtained during calcination of magnesite, by which the mechanism of grain growth was analyzed and discussed. It is suggested that a kind of highly reactive MgO is produced during the thermal decomposition of magnesites, which is exactly the reason why the activation energy of the grain growth during the thermal decomposition of magnesite is lower than that of bulk diffusion or surface diffusion.