Petri 网研究与中国计算机学会同步存在与发展。前者始于1962年 Carl Adam Petri的一篇著名论文,后者成立于1962年6月4日,这不能不说是历史的巧合。Petri 网研究三十年有了丰硕成果。每年一次的国际会议已过十二届(91年第十二届年会在...Petri 网研究与中国计算机学会同步存在与发展。前者始于1962年 Carl Adam Petri的一篇著名论文,后者成立于1962年6月4日,这不能不说是历史的巧合。Petri 网研究三十年有了丰硕成果。每年一次的国际会议已过十二届(91年第十二届年会在丹麦阿呼斯召开),每两年一次的国际会议专门讨论 Petri 网与系统性能,已过四届(91年第四届 PNPM 国际会议在澳大利亚墨尔本召开)。国际著名出版社 Spri-nger-Verlag 在其灰皮书系列中(LectureNotes in Computer Science)每年至少出一卷 Petri 网研究专集,称为 Advances展开更多
To study the chemical constituents of Sappan Lignum. Chemical constituents were isolated by method of solvent extraction, repeated chromatography with silica gel, Sephadex LH-20, and ODS. The structures were elucidate...To study the chemical constituents of Sappan Lignum. Chemical constituents were isolated by method of solvent extraction, repeated chromatography with silica gel, Sephadex LH-20, and ODS. The structures were elucidated based on spectro- scopic data. Fourteen compounds were isolated and their structures were identified as brazilin （1）, sappanone B （2）, （E）-3-（3,4- dihydroxybenzylidene）-7-hydroxychroman-4-one （3）, 3-deoxysappanone B （4）, brazilide A （5）, euxanthone （6）, quercetin （7）, rhamnetin （8）, sappanchalcone （9）, 3-deoxysappanchalcone （10）, butein （11）, 2,4,5-trihydroxybenzaldehyde （12）, 3,8,9-trihydroxy- 6H-benzo[c]chromen-6-one （13） and 13-sitosterol （14）. Compounds 12 and 13 were two new natural compounds, and the ^13C NMR data of compound 13 were reported for the first time. Compound 6 was the first xanthone isolated from the genus Caesalpinia.展开更多
Aim To study the chemical constituents from the stems of Xylosma controversum Clos. Methods The constituents were isolated by solvent extraction, repeated chromatography with silica gel, Sephadex LH-20, and RP-18 colu...Aim To study the chemical constituents from the stems of Xylosma controversum Clos. Methods The constituents were isolated by solvent extraction, repeated chromatography with silica gel, Sephadex LH-20, and RP-18 columns. The structures were elucidated by spectral analysis. Results Thirteen compounds were isolated and their structures were identified as （-）-syringaresinol （1）, syringaresinol-4-O-β-D-glucopyranoside （2）, syringaresinol-4,4′-bis-O-β-D-glucopyranoside （3）, （±）-catechin （4）, catechin-3-O- β-D-glucopyranoside （5）, catechin-5-O-β-D-glucopyranoside （6）, 1,3-bis-（4-hydroxy-3,5-dimethoxyphenyl）-1,3-propanediol （7）, （R）-（＋）-chaulmoogric acid （8）, friedelin （9）, uracile （10）, benzoic acid （11）, vaniUic acid （12）, and 4-hydroxybenzoic acid （13）. Conclusion All the compounds described above were isolated from this genus for the first time.展开更多
文摘Petri 网研究与中国计算机学会同步存在与发展。前者始于1962年 Carl Adam Petri的一篇著名论文,后者成立于1962年6月4日,这不能不说是历史的巧合。Petri 网研究三十年有了丰硕成果。每年一次的国际会议已过十二届(91年第十二届年会在丹麦阿呼斯召开),每两年一次的国际会议专门讨论 Petri 网与系统性能,已过四届(91年第四届 PNPM 国际会议在澳大利亚墨尔本召开)。国际著名出版社 Spri-nger-Verlag 在其灰皮书系列中(LectureNotes in Computer Science)每年至少出一卷 Petri 网研究专集,称为 Advances
文摘To study the chemical constituents of Sappan Lignum. Chemical constituents were isolated by method of solvent extraction, repeated chromatography with silica gel, Sephadex LH-20, and ODS. The structures were elucidated based on spectro- scopic data. Fourteen compounds were isolated and their structures were identified as brazilin （1）, sappanone B （2）, （E）-3-（3,4- dihydroxybenzylidene）-7-hydroxychroman-4-one （3）, 3-deoxysappanone B （4）, brazilide A （5）, euxanthone （6）, quercetin （7）, rhamnetin （8）, sappanchalcone （9）, 3-deoxysappanchalcone （10）, butein （11）, 2,4,5-trihydroxybenzaldehyde （12）, 3,8,9-trihydroxy- 6H-benzo[c]chromen-6-one （13） and 13-sitosterol （14）. Compounds 12 and 13 were two new natural compounds, and the ^13C NMR data of compound 13 were reported for the first time. Compound 6 was the first xanthone isolated from the genus Caesalpinia.
基金Program for Changjiang Scholar and InnovativeTeam in Peking University (Grant number: 985-2-063-112).
文摘Aim To study the chemical constituents from the stems of Xylosma controversum Clos. Methods The constituents were isolated by solvent extraction, repeated chromatography with silica gel, Sephadex LH-20, and RP-18 columns. The structures were elucidated by spectral analysis. Results Thirteen compounds were isolated and their structures were identified as （-）-syringaresinol （1）, syringaresinol-4-O-β-D-glucopyranoside （2）, syringaresinol-4,4′-bis-O-β-D-glucopyranoside （3）, （±）-catechin （4）, catechin-3-O- β-D-glucopyranoside （5）, catechin-5-O-β-D-glucopyranoside （6）, 1,3-bis-（4-hydroxy-3,5-dimethoxyphenyl）-1,3-propanediol （7）, （R）-（＋）-chaulmoogric acid （8）, friedelin （9）, uracile （10）, benzoic acid （11）, vaniUic acid （12）, and 4-hydroxybenzoic acid （13）. Conclusion All the compounds described above were isolated from this genus for the first time.
