中西医治疗子宫内膜异位症性不孕的现状

本文综述了近年来现代医学及祖国传统医学对子宫内膜异位症(EMT)导致不孕的发病机理及治疗方面进展的概况。     

原子荧光法测定田七中砷的含量

采用了硝酸+高氨酸消化样品,AFS-2202原子荧光光谱仪测定中药田七中砷的含量,该方法的检出限可达0.09μg·L~(-1),回收率在91.0％～109.2％之间。     

汉字识别的加工模型

通过文献分析,概述了认知心理学关于汉字识别过程及其加工机制研究的几种主要的加工模型,即经成分识别模型、多层次交互激活模型、连接主义模型、合体汉字字形识别模型和汉字识别的多层次格式塔双向加工模型.     

怎样写论文摘要

除论文标题之外 ,读者是通过摘要来决定是否继续阅读整篇论文 .因而摘要是一篇论文的窗口 .要在最小的空间内阐述问题、描述方法、总结贡献 ,是需要运用技巧与经验的 .一、摘要的内容摘要 (包括中、英文摘要 )的内容应包括目的、方法、结果、结论四个部分。重点应突出文章在结果和结论方面的创新之处 .二、摘要长度中文摘要长度一般不超过 30 0字 ,不少于 2 0 0字 ;英文摘要应比中文摘要有所扩展 ,以便使非汉语读者更多地了解文章的内容 .长度一般不超过 15 0 words,不少于 10 0 words。少数情况允许例外 ,但主题概念不得遗漏 .为了使在较短…     

A text-to-speech system with high intelligibility and naturalness for Chinese

I.IntroductionResearchesonChinesesynthesisdisclosethatonlywhenboththesegmentalandsupraseg-melltalfeaturesofthesyntheticspeecharesimilartothoseofthellaturalone,thesyntheticspeechwillsoundintelligibleandnatural[1].Amongekistingsynthetictechniques,theapproachbasedonacousticparametersca-nadustboththesegmentalandsuprasegmentalfeaturesofsyntheticunitsfiekiblyandcanbeconsideredasthemostreasonablesynthetictechniqueintheory.However,theparameterbasedsynthesizerisoverAfependentonthedevelopmentsofparamet…     

中药川白芷化学成分的研究

中药川白芷为伞形科当归属杭白芷 (Ａｎｇｅｌｉｃａｄａｈｕｒｉｃａ (Ｆｉｓｃｈ .ｅｘＨｏｆｆｍ .)Ｂｅｎｔｈ .ｅｔＨｏｏｋ .ｃｖｈａｎｇ ｂａｉｚｈｉＨｏｒｔ)的干燥根。川白芷为我国传统中药 ,主治头疼、鼻炎、癣症等疾病。现代药理实验表明白芷中所含的呋南香豆素具有平喘、降压、抗菌、解痉、光敏、活化交感系激素等多种药理作用[1] 。已有文献对白芷的化学成分进行了研究 ,发现白芷中主要含香豆素成分[2～ 4] 。四川遂宁产川白芷为道地白芷 ,其药性好 ,为进一步研究其活性成分 ,本文对遂宁产川白芷进行化学成分研究。共分离、…     

中医药抗衰老与微量元素的相关性

重点讨论了各类抗衰老中药和微量元素的相关性，探讨了中医中药衰老和现代微量元素的关系，为人类健康防病抗衰、益寿延年做出新的贡献。     

Use of Two-Dimensional Liquid Chromatography Combined with Diode-Array and Mass Spectrometric Detection for Analysis of Compounds in Flos Lonicera

Comprehensive two-dimensional liquid chromatographic separation by means of a combination of ion-exchange chromatography (IEC) and reversed-phase liquid chromatography (RPLC) has been realized and applied to the analysis of components of a traditional Chinese medicine Flos Lonicera. In the first dimension the components of a Flos Lonicera extract is separated on strong anion-exchange (SAX) column according to the charge-exchange properties of the components. In the second dimension the components are further fractionated by reversed-phase liquid chromatography (on ODS) on the basis of their hydrophobicity. The RPLC effluent is desalted and split and the components are identified on-line by use of both diode-array detection and mass spectrometry with atmospheric pressure chemical ionization (APCI–MS). In this way, the extract of Flos Lonicera can be rapidly separated, desalted, and analyzed, with determination of molecular weight. More than 58 components of an extract of Flos Lonicera were well resolved and six were tentatively identified from their UV and mass spectra.     

Headspace Solid-phase Microextraction–Gas Chromatographic–Mass Spectrometric Analysis of the Essential Oils of Two Traditional Chinese Medicines, Angelica pubescens and Angelica sinensis

Angelica pubescens and Angelica sinensis belong to the Umbelliferae family and both are used as traditional Chinese medicines. In the present study, headspace solid-phase microextraction (HS-SPME) with gas chromatography-mass spectrometry (GC-MS) was used for the analysis of the volatile constituents present in their roots. Eighty-seven compounds in Angelica pubescens and thirty-six compounds in Angelica sinensis were identified by GC-MS. Their relative contents were calculated by the peak area ratio. HS-SPME was compared to steam distillation (SD) by analyzing the volatile constituents of Angelica sinensis root. A good agreement between results obtained with both techniques was found. As a conclusion, HS-SPME is a powerful tool for determining the volatile constituents present in the TCMs.