试论欧美反倾销法GATT/WTO反倾销规则的相互影响

欧美反倾销法与GATT/WTO反倾销规则是在相互影响的过程中得以不断发展的,其中,前者对后者的影响更大,这体现在很多方面,如关于低于生产成本的销售、累积损害问题、司法审查、日落条款,等等.     

固相萃取、气相色谱法测定拟除虫菊酯农药

研究了水样中的微量拟除虫菊酯农药用固相萃取(C18)、GC/ECD法进行测定结果表明,250ml空白水中添加2μg混标拟除虫菊酯农药,氯氰菊酯、氰戊菊酯和溴氰菊酯回收率分别为37.7%、94.4%和78.2%.该方法简单快速、效果好,已成功应用于实际办案中.     

体液中常见滥用药物的系统筛选分析

本文建立了体液中常见滥用药物的筛选分析体系.尿液或血液经固相萃取(SPE)或液提取(LLE)后,直接用GC/NPD分析或经TFA、BSTFA衍生化后用GC/MS分析.方法适用于同时分析甲基苯丙胺、MDMA、度冷丁、去甲度冷丁、曲马多、美沙酮、EDDP、可卡因、苯甲酰芽子碱、可待因、安定、氯丙嗪、吗啡、单乙酰吗啡等十四种常见滥用药物及代谢物.SPE法和LLE法回收率分别为66～102%和50～86%,最低检出限为2-5ng/ml尿.涉毒案件的鉴定应用表明该分析方法简便、快速、可靠.     

桃红四物汤中5种主要成分在脑缺血再灌注模型大鼠体内组织分布的研究

目的 研究脑缺血再灌注模型大鼠在灌胃桃红四物汤(Taohong Siwu Decoction, THSWD)后,5种主要活性成分(藁本内酯、苦杏仁苷、芍药苷、羟基红花黄色素A、阿魏酸)在体内组织分布的差异和规律。方法 采用线栓法构建大鼠大脑中动脉闭塞(middle cerebral artery occlusion, MCAO)模型,然后再灌注24 h建立脑缺血再灌注大鼠模型;将模型复制成功的大鼠灌胃THSWD(50 g/kg)后,于不同时间点采集组织(心、肝、脾、肺、肾、脑),样品处理后采用UPLC-MS技术检测各组织中待测成分的含量。结果 各成分在模型大鼠各组织中分布广泛,在肝、肾组织中浓度较高,其中藁本内酯在脑组织中有较高浓度;苦杏仁苷在肺部具有组织分布特异性;芍药苷、羟基红花黄色素A在大鼠肝、脾、肺组织具有较高分布比例,阿魏酸在脑组织中未检出。结论 THSWD中5种主要活性成分在各组织中分布广泛,各组织不同时间点的分布趋势也存在较大差异。     

宁前胡内生真菌的培养分离与鉴定

目的 对安徽道地药材白花前胡内生真菌进行培养分离与鉴定。方法 通过组织块法对宁前胡进行内生真菌的分离,采用形态学和分子生物学相结合的手段进行鉴定。结果 从宁前胡中共计分离得到41株内生真菌,分属于10属21种,分别为Fusarium、Penicillium、Aspergillus、Alternaria、Tricladium、Phoma、Collariella、Rhizoctonia、Colletotrichum、Trichoderma。分布最广的类群是镰孢霉属Fusarium sp.,其分离频率为29.27%;其次是青霉属Penicillium sp.和链格孢属Alternaria sp.,其分离频率均为19.51%,为其优势种属。结论 宁前胡中含有丰富的内生真菌资源,进一步开发利用宁前胡中内生真菌资源具有重要意义。     

脑络欣通对大脑中动脉阻塞再灌注模型大鼠神经干细胞增殖分化的影响

目的 观察脑络欣通对大脑中动脉阻塞再灌注（middle cerebral artery occlusion-reperfusion,MCAO-R）模型大鼠神经干细胞增殖分化的影响。方法 采用线栓法复制MCAO-R大鼠模型,将30只健康雄性SD大鼠随机分成假手术组、模型组和给药组。分别采用神经功能评分和TTC染色鉴定模型大鼠的神经功能缺损和脑缺血面积,采用免疫荧光染色法观察大鼠海马CA1、CA2、CA3、齿状回（dentate gyrus,DG）区巢蛋白（Nestin）和神经丝蛋白-H（hypophosphorylated neurofilament-H,NF-H）表达水平。结果 给药组Nestin阳性表达主要发生在DG区,NF-H阳性表达主要发生在CA3区。脑络欣通促进神经干细胞增殖的作用在DG、CA1、CA2、CA3区均十分明显,以DG区尤为突出,促进神经干细胞分化的作用主要表现在CA3、DG、CA2、CA1区。与模型组比较,给药组大鼠海马各区的Nestin、NF-H阳性细胞均明显增多,差异具有统计学意义（P＜0.05）。结论 脑络欣通具有促进海马区神经干细胞增殖并分化为神经细胞的作用。     

From Reset to Restart: The US-Russia Cyclical Relationship in the Post-Cold War Era

ABSTRACT

After a quarter of a century of oscillating relations between Washington and Moscow, Trump’s 2017 National Security Strategy named Russia as one of the main challengers to the US-led order. Power transition theory is used to explain the alternating cooperative and competitive phases during each of the first three post-Cold War US presidencies: first, initial attempts at cooperation are driven by US willingness to integrate its former rival into the liberal order; then, regression into competition follows as Washington’s influence rises in territories that Moscow considers sensitive for its national security.     

Identification of furosemide in hair in a post‐mortem case by UHPLC‐MS/MS with guidance on interpretation

Testing for drugs in hair raises several difficulties. Among them is the interpretation of the final concentration(s). In a post‐mortem case, analyses revealed the presence of furosemide (12 ng/mL) in femoral blood, although it was not part of the victim's treatment. The prosecutor requested our laboratory to undertake an additional analysis in hair to obtain information about the use of furosemide. A specific method was therefore developed and validated to identify and quantify furosemide in hair by UHPLC‐MS/MS. After decontamination of 30 mg of hair, incubation in acidic condition, extraction with ethyl acetate, the samples were analyzed by UHPLC‐MS/MS. Furosemide was found in the victim's hair at 225 pg/mg. However, it was not possible to interpret this concentration due to the absence of data in the literature. Therefore, the authors performed a controlled study in two parts. In order to establish the basis of interpretation, several volunteers were tested (four after a single 20 mg administration and twenty‐four under daily treatment). The first part indicated that a single dose is not detectable in hair using our method. The second part demonstrated concentrations ranging from 5 to 1110 pg/mg with no correlation between dosage and hair concentrations. The decedent's hair result was interpreted as repeated exposures. In the case of furosemide analysis, hair can provide information about its presence but cannot give information about dosage or frequency of use.     

CSF1PO,TPOX和TH01基因座复合扩增及其在苗族人群中的基因频率分布

在同一反应体系中，对CSFIPO，TPOX和TH01三个STR基因座做复合扩增，采用高分辨率的聚丙烯酸胺凝胶电泳分离、银染法显影技术，对云南苗族的3个基因座基因频率分布进行调查。CSFIPO基因座，观察到8个等位基因，17个基因型；TPOX基因座，观察到6个等位基因，14个基因型；TH01基因座，观察到6个等位基因，19个基因型。     

应用SPME-GL／MS检测放火现场中助燃剂的研究

运用GC/MS拜利用自制的萃取、加热装置,研究在纵火现场助燃剂一汽油、煤油、柴油检测中固相微萃取的萃取温度和萃取时间对检测灵敏度的影响,确定了适于实际检案中采用的萃取时间和萃取温度.此法测定汽油、煤油、柴油的检出限分别为0.65 pl/ml、1.63pl/ml和1.63 pl/ml.