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| 1 | Simultaneous determination of seven principal constituents in Asari Radix et Rhizoma by HPLC显示文摘建立了同时测定细辛中花椒酚、卡枯醇、甲基丁香酚、l–芝麻脂素、黄樟醚、细辛素和l–细辛脂素7种主要成分含量的HPLC方法,并测定了55份不同来源的细辛药材(35份北细辛、3份汉城细辛和17份华细辛)中这7种成分的含量,比较了不同品种细辛中7种成分含量差异。采用Agilent Zorbax SB–C18色谱柱(4.6 mm×25 cm,5μm),水(A)–乙腈(B)为流动相进行梯度洗脱55 min,DAD检测器检测,柱温20°C,检测波长287 nm。被测成分在测试范围内线性关系良好,r2>0.999;加样回收率96.0%–103.1%,RSD小于2.54%。该方法准确、灵敏、重复性好。测定结果表明不同来源的细辛样品中7种成分的含量差异显著,其中挥发性成分甲基丁香酚在辽细辛(汉城细辛与北细辛的根及根茎)中的含量为(6.17±5.13)mg/g,显著高于其在华细辛(华细辛的根及根茎)中的含量(0.58±0.39)mg/g,有毒成分黄樟醚在辽细辛中的含量为(2.66±2.16)mg/g,低于其在华细辛的含量(6.44±3.88)mg/g。本文首次报道了细辛中花椒酚和细辛素的含量。 | Chen Cao Jingzhe Wang Lu Wang Mingying Shang Guangxue Liu Feng Xu Xuan Wang Shaoqing Cai | 2015 | Journal of Chinese Pharmaceutical Sciences2015，24，8： | 6 |
| 2 | Diagenesis and Diagenetic Evolution of Deltaic and Neritic Gas-Bearing Sandstones in the Lower Mingyuefeng Formation of Paleogene, Lishui Sag, East China Sea Shelf Basin: Implications for Depositional Environments and Sequence Stratigraphy Controls显示文摘Gas-bearing deposits in the Lower Mingyuefeng Formation of Paleogene, Lishui Sag, East China Sea Shelf Basin consist of shoreface sandstones of the highstand systems tract(HST) and transgressive systems tract(TST), and deltaic sandstones of the lowstand systems tract(LST) and falling stage systems tract(FSST).Detailed petrographic observations suggest that the diagenetic features and related evolution of these deposits cannot be simply characterized and demonstrated in the depth domain.However, the occurrence of diagenetic minerals systematically depends on the studied interval within the HST, TST, LST, and FSST; therefore, diagenesis in this region can be better constrained when studied in the context of the depositional environments and sequence stratigraphic framework.The eogenetic processes in such settings include:(1) microcrystalline siderite precipitated as concretions in almost all environments and systems tracts, which inhibited further mechanical compaction;(2) grain dissolution and kaolinitization occurred in shoreface HST sandstones and deltaic LST and FSST sandstones;(3) glaucony was locally observed, which did not clearly reflect the controls of facies or sequence stratigraphy; and(4) cementation by pyrite aggregates occurred in the shoreface HST sandstones and deltaic LST sandstones.The mesogenetic diagenesis includes:(1) partial conversion of kaolinite into dickite in deltaic LST sandstones, and minor chlorite cementation in deltaic FSST sandstones;(2) transformation of kaolinite into illite and quartz cementation in deltaic LST and FSST sandstones;(3) frequent precipitation of ankerite and ferroan calcite in shoreface TST sandstones and early HST sandstones, forming baffles and barriers for fluid flow, with common calcite in shoreface HST sandstones as a late diagenetic cement; and(4) formation of dawsonite in the deltaic LST and FSST sandstones, which is interpreted to be a product of the invasion of a CO2-rich fluid, and acts as a good indicator of CO2-bearing reservoirs.This study has thus constructed a reliable conceptual model to describe the spatial and temporal distribution of diagenetic alterations.The results may provide an entirely new conceptual framework and methodology for successful gas exploration in the continental margins of offshore China, thus allowing us to predict and unravel the distribution and quality evolution of clastic reservoirs at a more detailed and reliable scale. | XU Fa ZHANG Penghui ZHANG Jinliang LIU Jinshui HOU Guowei ZHANG Ming LI Jingzhe LIU Shasha GUO Jiaqi MENG Ningning | 2015 | Acta Geologica Sinica(English Edition)2015，89，5： | 5 |
| 3 | Influence of extreme weather and meteorological anomalies on outbreaks of influenza A (H1N1)显示文摘Biological experiments and epidemiological evidence indicate that variations in environment have important effect on the occurrence and transmission of epidemic influenza.It is therefore important to understand the characteristic patterns of transmission for prevention of disease and reduction of disease burden.Based on case records,we analyzed the environmental characteristics including climate variables in Changsha,and then constructed a meteorological anomaly susceptive-infective-removal (SIR) model on the basis of the results of influenza A (H1N1) transmission.The results showed that the outbreak of influenza A (H1N1) in Changsha showed significant correlation with meteorological conditions;the spread of influenza was sensitive to meteorological anomalies,and that the outbreak of influenza A (H1N1) in Changsha was influenced by a combination of absolute humidity anomalous weather conditions,contact rates of the influenza patients and changes in population movements.These findings will provide helpful information regarding prevention strategies under different conditions,a fresh understanding of the emergence and re-emergence of influenza outbreaks,and a new perspective on the transmission dynamics of influenza. | XIAO Hong TIAN HuaiYu LIN XiaoLing GAO LiDong DAI XiangYu ZHANG XiXing CHEN BiYun ZHAO Jian XU JingZhe | 2013 | Science China(Technological Sciences)2013，56，3： | 2 |
| 4 | Total synthesis and stereochemistry establishmentof tumescenamide A显示文摘Tumescenamide A (1), isolated from Streptomyces tumescens YM23-20, consists of a cyclic depsipeptideand a side-chain 2,4-dimethylheptanoate (Dmh). Herein, we report the first total synthesis of tumescenamide A (1) and establish its stereochemistry. The configuration of Dmh is 2S,4S and, notably, the configuration of Val is revised as D. In addition, a mild and practical method for the β-elimination of derivatives ofserine and threonine by using nano-K_(2)CO_(3) as a base was established. A highly stereoselective synthesis ofthe Dmh substructure was also developed. | Hong Xue Shiming Fan Jingzhe Xu Shouxin Liu | 2022 | Organic Chemistry Frontiers2022，9，6： | 0 |
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