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横坑切梢小蠹寄主云南松针叶及树皮的挥发性成分 被引量:3
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作者 徐颖凯 冯先慧 +2 位作者 王红伟 杨伟 杨桦 《四川林业科技》 2018年第3期88-92,115,共6页
揭示横坑切梢小蠹对寄主云南松的选择机制,为筛选对横坑切梢小蠹具有生物活性的植物源引诱剂,实现对该虫的生态控制提供理论指导。采用萃取蒸馏结合气相色谱-质谱(GC-MS)联用技术,分析了云南松针叶和树皮中的挥发性成分。云南松针叶挥... 揭示横坑切梢小蠹对寄主云南松的选择机制,为筛选对横坑切梢小蠹具有生物活性的植物源引诱剂,实现对该虫的生态控制提供理论指导。采用萃取蒸馏结合气相色谱-质谱(GC-MS)联用技术,分析了云南松针叶和树皮中的挥发性成分。云南松针叶挥发性成分主要包括7类35种,分别是24种萜烯类、5种醇类、2种酮类、1种醚类、1种酚类、1种酯类和1种烷烃类;云南松树皮挥发性成分主要包括7类34种,分别是22种萜烯类、5种醇类、2种酮类、2种烷烃类、1种醚类、1种酚类和1种酯类。 展开更多
关键词 云南松松针 云南松树皮 气相色谱-质谱联用 挥发性成分
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Isolation of Hemicellulose from Wood Chips via Extraction with Kraft Green Liquor 被引量:2
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作者 SUN Hui xu ying-kai xu Guo-zhi 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第4期667-671,共5页
The present paper covers the extraction of hemicelluloses from woods, i.e., Eucalyptus Globulus, white fir and Douglas fir via green liquor pretreatment and alkali post-treatment with sodium hydroxide. The effects of ... The present paper covers the extraction of hemicelluloses from woods, i.e., Eucalyptus Globulus, white fir and Douglas fir via green liquor pretreatment and alkali post-treatment with sodium hydroxide. The effects of such extraction conditions as extraction time, temperature on the yields of hemicellulose and the degree of deliginification were investigated. Sugar analyses using Dionex indicate that xylose, glucose and mannose are the main sugar types present in the hemicellulose from Eucalyptus. Other sugar components such as arabinose and galactose were also found in Dogulas fir hemicellulose. The highest yield of hemicellulose was 8.4% for Eucalyptus extracted with green liquor at 130 ℃ for 3.5 h. Further sodium hydroxide extraction for 5 h gave a hemicellulose yield of about 20%. The use of green liquor for the extraction of wood hemicellulose is believed to be the first attempt. 展开更多
关键词 HEMICELLULOSE LIGNIN WOOD Green liquor Alkali extraction
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Quantitative ^(31)P NMR Analysis of Lignocellulosic Materials in Ionic Liquids
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作者 SUN Hui xu ying-kai xu Guo-zhi 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第3期488-490,共3页
In an effort to utilize NMR technique for the analysis of the structural components of wood and biomasses such as lignin, we made a comparative study of lignin contents of several types of lignocellulosie materials bo... In an effort to utilize NMR technique for the analysis of the structural components of wood and biomasses such as lignin, we made a comparative study of lignin contents of several types of lignocellulosie materials both before and after enzymatic hydrolyses. To this end, Eucalyptus Globulus, Norway spruce thermomeehanieal pulp(TMP) corn stover and Eucalyptus kraft pulp were ball-milled and treated with cellulase to prepare materials with high lignin contents. These materials were analyzed via ^31p NMR in ionic liquids. The results show that the contents of various functional groups for the lignocellulosic materials after enzymatic hydrolyses are generally in agreement with those from their corresponding enzymatic mild acidolysis liginins(EMALs), indicating that ^31p NMR analysis of lignocellulosic materials in ionic liquids is a promising method for quantitative characterization of lignocellulosic materials. 展开更多
关键词 Structural characterization ^31p NMR Enzymatic mild acidolysis lignin(EMAL)
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乙肝病毒感染相关性肝病外周血Th1/Th2型细胞因子和miR-122与miR-155表达及意义
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作者 周智峰 徐英凯 黄勇 《中华医院感染学杂志》 CAS CSCD 北大核心 2024年第14期2094-2098,共5页
目的 探究乙型肝炎病毒(HBV)感染相关性肝病外周血辅助型T细胞(Th)1/Th2细胞因子和微小RNA(miR)-122与miR-155表达及意义.方法 选择2020年1月-2023年3月海安市中医院收治的HBV感染相关性肝病患者102例为研究对象,按照病情严重程度分为... 目的 探究乙型肝炎病毒(HBV)感染相关性肝病外周血辅助型T细胞(Th)1/Th2细胞因子和微小RNA(miR)-122与miR-155表达及意义.方法 选择2020年1月-2023年3月海安市中医院收治的HBV感染相关性肝病患者102例为研究对象,按照病情严重程度分为慢性乙型肝炎组45例、乙型肝炎肝硬化组36例、乙型肝炎肝癌组21例.另选取40名同期医院体检的健康人员为对照组.采用实时荧光聚合酶链反应检测血清中miR-122及miR-155表达水平,流式细胞仪检测Th1、Th2及Th1/Th2,电化学发光法使用全自动免疫分析仪测定肝功能指标,比较各组患者检测结果,并采用Spearman相关性分析血清Th1/Th2型细胞因子、miR-122和miR-155与病情严重程度之间的关系.结果 四组患者外周血Th1、Th2、Th1/Th2、miR-122、miR-155和肝功能指标水平比较,差异有统计学意义(P<0.05);与慢性乙型肝炎组相比,乙型肝炎肝硬化组、乙型肝炎肝癌组Th1、Th1/Th2水平降低,Th2、miR-122、miR-155水平升高,乙型肝炎肝癌组Th1、Th1/Th2水平最低,Th2、miR-122、miR-155水平最高,差异均有统计学意义(P<0.05).Spearman相关性分析结果显示,HBV感染相关性肝病血清Th1、Th1/Th2与患者病情严重程度呈负相关,Th2、miR-122和miR-155与病情严重程度呈正相关(P<0.05).结论 Th1/Th2型细胞因子、miR-122和miR-155在HBV感染相关性肝病患者血清中呈高表达状态,且与患者病情严重程度具有相关性. 展开更多
关键词 微小RNA miRNA-155 miRNA-122 辅助型T细胞1/2 乙型肝炎病毒
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