刺芫荽挥发性成分研究

以野生刺芫荽为原料,采用同时蒸馏萃取法提取其挥发性成分,应用气相色谱—质谱法对提取物进行化学成分分析.实验结果表明,野生刺芫荽提取物中共鉴定出24种化合物,占总峰面积的65.94％,质量分数达到1.00％以上的有6种物质,其挥发性成分中醛酮类化合物相对质量分数达到58.05％.     

国标中食品硼砂检测方法的比较分析

对食品中硼砂含量的分光光度法、电感耦合等离子体发射光谱法（ICP—AES）和电感耦合等离子体质谱法（ICP—MS）、离子色谱法（IC）等检测方法进行比较研究。结果表明,虽然分光光度法、ICP—AES、ICP—MS为国标GB／T21918--2008中采用的方法,但均存在一定的局限性,离子色谱法因快速、方便、环保而被逐步推广。     

Investigation of the materials found in the studio of Francis Bacon (1909–1992)

Abstract

The investigation of materials found in Bacon's studio is reported. The contents of the studio are examined and interpreted to identify the materials and colours most favoured by Bacon, and the range of media used. A small number of colours appear to have been heavily used. Some objects used as tools in the painting process are also investigated and explain textures seen in paint in his works. Samples of selected materials from the studio are analysed to identify the components of paints (pigments, extenders, and binders) used by Bacon. This investigation is part of a wider project examining his materials and techniques. The analytical information obtained here from the studio helps to clarify the statements made by Bacon in interviews regarding his use of materials and is proving useful in the identification of materials in his paintings, in order to help with the conservation and authentication of his works.     

ICP—MS测定木瓜中26种微量元素

采用电感耦合等离子体质谱仪（ICP—MS）,同时测定了木瓜中的26种微量元素。结果表明木瓜中K、Na、Ca、Mg等元素的含量都比较丰富,并讨论了这些有益元素与人体健康的关系。该方法的回收率为96．5％-105．6％,RSD值为0．26％-2．03％,结果可信度高。该法精密度高、准确性好、干扰较少、快速简单,可用于质量控制。并为中药材木瓜中26种元素含量测定提供了方法。为进一步开发和利用木瓜提供了科学依据。     

中小强度有氧运动后大鼠右心室肌蛋白质组差异表达的研究

目的:运用蛋白质组学的理论和方法来研究中小强度有氧运动对大鼠右心室肌蛋白质组的影响。方法:将20只SD雄性大鼠随机分为对照组和运动组(各1组,每组n=10)。采用中小强度运动负荷跑台训练建立运动实验模型,提取右心室肌组织全蛋白样品,采用双向凝胶电泳进行蛋白样品分离。运用ImageMaster 2D Platinum图像分析软件对2-DE胶进行分析,通过图像分析,选取运动后差异表达量≥5倍的蛋白点,用串联飞行时间质谱蛋白质仪(ULGRAFL-FLEX-TOF/TOF)进行质谱鉴定。结果:经过8周运动后,在2-DE图谱上运动组和对照组检测到的蛋白质点分别为(547±18)个和(530±14)个,匹配率分别为(71.34±3.25)%和(70.28±2.38)%。运动后共有58个蛋白质点发生了变化:表达量上调≥2倍的点有33个,下调≥2倍的点有25个,其中上调≥5倍的点有8个,下调≥5倍的点有8个。选择差异表达量≥5倍的蛋白质点为目标蛋白质进行质谱分析,共鉴定出了5个差异表达蛋白质点。结论:在长期中小强度有氧运动后,大鼠右室肌蛋白质组发生了明显的差异性表达,这些差异性表达的蛋白质点为进一步观察在运动应激状态下对心脏...     

Relationship between alanine aminotransferase levels and metabolic syndrome in nonalcoholic fatty liver disease

Objective:To investigate the relationship between alanine aminotransferase (ALT)levels and metabolic syndrome (MS)in nonalcoholic fatty liver disease(NAFLD).Methods:A total of 26527 subjects who received medical health checkup in our hospital from January 2005 to July 2007 were enrolled in the study.The diagnosis of fatty liver was based on ultrasound imaging.MS Was defined according to the criteria of the Adult Treatment Panel Ⅲ.ALT,triglyceride(TG),high density lipoprotein cholesterol(HDL-c),fasting plasma glucose(FPG),height,weight,waist circumference(WC),systolic blood pressure (SBP)and diastolic blood pressure(DBP)were measured in each subject to analyze the relationship between MS and ALT activity.Results:(1)The prevalence of NAFLD in men(30.94%)was significantly higher than that in women(15.65%);(2)The incidence of MS in NAFLD(33.83%)was significantly greater than that in non-NAFLD(10.62%);(3)Of the 6470 subjects with NAFLD,in the age-adjusted partial correlation analysis,there were statistically significant correlations between the ALT levels and most metabolic risk factors in each sex(P＜0.01),except that ALT levels had no correlation with HDL-c in women.Moreover,in the multiple stepwise regression analysis,SBP lost its significance,and WC,body mass index(BMI),age,DBP,TG and FPG were independently associated with ALT levels in both sexes (P＜0.05).HDL-c remained significant and was independently related to ALT leveis in men;(4)ALT levels were significantly higher in subjects with MS compared to those without MS(P＜0.001).Mean ALT levels increased with the number of MS cornponents in each sex (P.＜0.05 for trend).Conelusion:We found a strong relationship between ALT leveIs and MS in NAFLD and revealed that the cluster of MS components might be the predictor for ALT elevations.     

有机改性膨润土与沉积物中有机物的相互作用研究

以CTAB一次改性的天然膨润土为分散介质,以沉积物中芳香烃类化合物为目标分析物,对有机改性膨润土与待测沉积物的相互作用进行了实验研究,并以气相色谱/质谱法对提取物进行了分析.实验表明:改性膨润土对沉积物中的芳香烃类化合物具有很强的吸附能力,并与改性膨润土中有机碳含量有关;在提取沉积物中萘时,改性膨润土的使用显著提高了萘的回收率.因此,改性膨润土作为分散剂对提取过程的作用主要是净化作用和分散作用,可大大提高溶剂对沉积物中芳香烃类化合物的提取效率.     

茼蒿挥发性成分的分析

采用同时蒸馏-萃取的方法，对辽宁鞍山、铁岭、抚顺、阜新产的茼蒿的挥发性成分进行了提取，采用GC／MS方法对挥发油进行了鉴定，并对四产地的挥发油化学成分进行了比较．     

基于B/S的高校动态网站的设计与实现

以一具体的高校动态网站的规划与建设为例,运用ASP编程技术和Microsoft Access 2003数据库技术,以Windows 2000 Server or windows 2000 Advanced Server为运行平台,介绍了高校动态网站在日常管理工作中所发挥的巨大作用。包括学院信息自动发布系统,院系管理系统,学生成绩管理系统,电子公告板系统,用户注册模块,用户调查系统。针对当前多数高校的校园网建设,提出了加强“动态交互能力”以提高网站的应用效率的新思路。     

材料模拟软件在半导体物理教学中的应用研究

根据半导体物理课程的教学内容和特点引入材料模拟和计算软件Materials Studio(MS)进行辅助教学,使抽象的理论知识通过模拟软件和计算实验形象化地展示出来,引导学生应用模拟和计算软件深入了解半导体材料的结构和理论性质,在使用MS软件模拟计算过程中加深对课堂上理论知识的理解,提高学生的学习兴趣与积极性,在促进学生们半导体物理学习和掌握方面取得良好的实际效果。