Analysis of Phenylethanoid Glycosides and Flavonoid Glycosides from Scutellaria galericulata

Objective:To investigate the chemical constituents of Scutellaria galericulata.Method: The herb of S.galericulata was crushed and then extracted with 95% ethanol.The extracts were combined and concentrated under reduced pressure.The extracts were dispersed in water and respectively extracted with petroleum ether, ethyl acetate, chloroform and n-butanol to get petroleum ether fraction, ethyl acetate fraction, chloroform fraction and n-butanolfraction.Ethyl acetate fraction were separated and purified by silica gel column chromatography, Sephadex LH-20 and HPTLC.The structures of the glycosides compounds were identified by their physico-chemical properties and spectral data.Result: Eleven compounds were isolated and purified as: isocrenatoside (1),osmanthuside B_6 (2), eutigoide A (3), plantainoside C (4), calceorioside B (5), isomartynoside (6), verbascoside (7), acteoside (8), desrhamnosyl acteoside (9), 5,7-dihydroxy-8,2'-dimethoxyflavone-7-O-beta-D-glucopyranoside (10), and apigenin-7-O-rhamnoside (11).Conclusion: Compounds 1-4 and 7-11 were isolated from S.galericulata for the first time, and the literature review showed that plantainoside C, apigenin-7-O-rhamnoside and other compounds had anti-inflammatory and antioxidant activities, providing a good reference for further studies onpharmacodynamic material basis and the development and utilization of S.galericulata

Phase-Transfer Technique for Polymer-Protected Noble Metal Nanoparticles

依据聚乙烯吡咯烷酮(PVP)在水中的溶解度随温度升高而降低的特性,建立了将PVP保护的金、银、铂纳米粒子从水相转移到油相的简单而有效的相转移技术.方法是利用电化学还原法先于水溶液中制备粒度均匀的金属纳米粒子,然后向电化学合成后的金属纳米水溶胶中加入适量正丁醇,在搅拌条件下升温至80℃即可使金属纳米粒子从水相转移至有机相.纳米粒子的相转移效率很高,而且相转移后粒子在油相中分散很好,没有团聚现象发生.在此基础上进一步建立在油水混合体系电化学合成金属纳米粒子的实验方法,为收集纳米粒子和制备纳米粒子薄膜提供了新的有效途径.A novel phase-transfer method was developed based on the decrease of PVP's solubility in water with increasing temperature,by means of which PVP-protected gold,silver and platinum nanoparticles can be conveniently transferred from aqueous phase to 1-butanol phase.Monodispersed metal nanoparticles were electrochemically synthesized at first in the aqueous,and then 1-butanol of appropriate volume was added to the aqueous phase.Heating the oil-water mixture to 80 ℃ under vigorous stirring would make metal nanoparticles leave the aqueous phase and enter into the 1-butanol phase,with high phasetransfer efficiency and without aggregation between nanoparticles.An electrochemical method to synthesize metal nanoparticles in the oil-water mixtures was further established,which provides a new path for collection of nanoparticles and preparation of metal nanofilms.作者联系地址：山东大学化学与化工学院,哈尔滨工业大学(威海)海洋学院,山东师范大学理化分析测试中心,山东大学化学与化工学院,山东大学化学与化工学院,山东大学化学与化工学院 山东济南250100,山东威海264209,山东济南250014,山东济南250100,山东济南250100,山东济南250100Author's Address: 1,HUANG Ming-hu~2,ZHANG Xiao-kai~3, HUANG Shao-xin~1,PAN Wei~1,MA Hou-yi~*11.School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,Shandong,China,2.School of the Ocean,Harbin Institute of Technology at Weihai,Weihai 264209,Shandong,China;3.Analysis and Testing Center,Shandong Normal University,Jinan 250014,Shandong,Chin

Novel Electrochemical Method for Synthesis of Nanostructured Materials of Noble Metals Based on Poly(N-Vinylpyrrolidone) (PVP)

以不同聚合度的聚乙烯吡咯烷酮(PVP)作为金纳米团簇的稳定剂和形状控制剂,应用电化学还原方法制备尺寸可控的金纳米晶体.借助PVP聚合物的动态伸缩和卷曲特性将电化学还原得到的金纳米粒子前驱体组装成线状和环状的纳米粒子聚集体,再由不稳定前驱体粒子的定向聚集制备厚度为几十纳米的金纳米棱柱.并用分步电化学还原法合成核壳结构的金银纳米复合粒子.本文为制备不同形状和结构的贵金属纳米结构材料提供了一种可行的电化学合成新方法.Gold nanocrystals with controllable size were synthesized through a simple electroreduction method using poly(N-vinylpyrrolidone)(PVP) of different polymerization degree as both stabilizer and shape-controller for gold nanoclusters.Individual gold nanoparticles spontaneously assembled into the wire-and ring-shaped nanoparticle aggregates depending on the PVP's dynamic stretching and curling,and precursor nanoparticles grew into flat,single-crystalline nanoprisms with thickness of dozens of nanometers based on the oriented aggregation between particles.Besides,core-shell Au/Ag nanoparticles were conveniently synthesized through two-step electroreduction of noble metal ions in the presence of PVPK30.The electrochemical synthetic method based on PVP provides a new path for preparation of noble metal nanostructured materials with different shape and structure.作者联系地址：山东大学化学与化工学院,山东师范大学理化分析测试中心,哈尔滨工业大学(威海)海洋学院,山东大学化学与化工学院,山东大学化学与化工学院,山东大学化学与化工学院 山东济南250100,山东济南250014,山东威海264209,山东济南250100,山东济南250100,山东济南250100Author's Address: 1,ZHANG Xiao-kai~2,HUANG Ming-hu~3,HUANG Shao-xin~1,FENG Xing-li~1,MA Hou-yi~*11.School of Chemistry and Chemical Engineering,Shandong University,Jinan 250100,Shandong,China,2.Analysis and Testing Center,Shandong Normal University,Jinan 250014,Shandong,China,3.School of the Ocean,Harbin Institute of Technology at Weihai,Weihai 264209, Shandong,Chin

Cry1Ab毒蛋白对亚洲玉米螟生长发育的影响[J]

为了明确Cry1Ab毒蛋白是否对亚洲玉米螟具有控害作用,采用实验种群生命表的方法,研究了Cry1Ab毒蛋白对亚洲玉米螟的生长发育和种群增长的影响.结果表明,亚洲玉米螟在各个发育阶段对高浓度(50μg/mL)的Cry1Ab毒蛋白敏感,而对低浓度(0.1 μg/mL)的Cry1Ab毒蛋白不敏感.10.0 μg/mL Cry1Ab毒蛋白处理的亚洲玉米螟幼虫历期显著低于对照和其它处理(P＜ 0.05) 50.0 μg/mL Cry1Ab毒蛋白处理的亚洲玉米螟雌成虫产卵前期、单雌产卵量和雌成虫寿命均显著低于对照(P＜0.05).1.0 μg/mL Cry1Ab毒蛋白处理的亚洲玉米螟蛹重显著低于对照(P＜0.05).50.0、10.0、1.0、0.1 μg/mL Cry1Ab毒蛋白的人工饲料处理的亚洲玉米螟净增长率显著低于对照(P＜0.05).而0.1 tμg/mL Cry1Ab毒蛋白处理的净增长率和世代平均周期均显著短于对照(P＜0.05).结果表明,Cry1Ab毒蛋白对亚洲玉米螟的种群增长有一定影响,且对亚洲玉米螟具有一定的控制作用

新疆抗虫棉区域棉铃虫庇护所的评估/Evaluation of the Refuge for Cotton Bollworm (Helicoverpa armigera) in Xinjiang[J]

【目的】转 Bt 基因抗虫棉大规模种植以来，棉铃虫对转基因棉花抗性风险在逐渐上升，“庇护所”是抗性治理的有效策略之一，玉米被认为是我国棉区重要的庇护所，在新疆兵团和地方作物结构﹑耕作制度不同的情况下，系统评估玉米的庇护所功能。【方法】基于新疆作物种植统计数据(2002~2012)，通过时间序列分析﹑评估不同地区和不同管理模式下(兵团规模化种植和地方小农户模式下)，玉米种植面积变化对庇护所功能的影响，并采用方差分析南﹑北疆的兵团和地方之间是否存在差异性。【结果】南﹑北疆的庇护所―玉米种植面积间无明显差异性(P ﹥0.05)，兵团和对应地方间存在差异性(P ﹤0.01)，兵团种植比例小于地方。【结论】玉米作为棉铃虫有效庇护所不仅需要在景观尺度上考虑其种植规模和空间分布，同时在田间尺度上结合棉铃虫的生物学特性，合理布局不同的品种资源(不同熟性)和种植模式(春玉米和夏玉米；条带种植和条块种植)

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies