Analysis of Ecstasy Tablets Using Capillary Electrophoresis with Capacitively Coupled Contactless Conductivity Detection

A method for the identification of 3,4‐methylenedioxymethamphetamine (MDMA) and meta‐chlorophenylpiperazine (mCPP) was developed employing capillary electrophoresis (CE) with capacitively coupled contactless conductivity detection (C⁴D). Sample extraction, separation, and detection of “Ecstasy” tablets were performed in <10 min without sample derivatization. The separation electrolyte was 20 mm TAPS/Lithium, pH 8.7. Average minimal detectable amounts for MDMA and mCPP were 0.04 mg/tablet, several orders of magnitude lower than the minimum amount encountered in a tablet. Seven different Ecstasy tablets seized in Rio de Janeiro, Brazil, were analyzed by CE‐C⁴D and compared against routine gas chromatography‐mass spectrometry (GC‐MS). The CE method demonstrated sufficient selectivity to discriminate the two target drugs, MDMA and mCPP, from the other drugs present in seizures, namely amphepramone, fenproporex, caffeine, lidocaine, and cocaine. Separation was performed in <90 sec. The advantages of using C⁴D instead of traditional CE‐UV methods for in‐field analysis are also discussed.     

中等强国的变迁与全球治理体系的演进

在全球治理体系的更替演进中,大国始终占据着绝对优势地位,是处于国际矛盾和重大事件中心的主要角色,也是决定全球治理机制创建进度和主导过程控制的核心要素。从21世纪第2个十年开始,中等强国在推动全球治理体系的创设过程中开始发挥着重要作用,并借助二十国集团机制实现从治理参与者向治理推动者的进阶升迁,不仅标志着中等强国与全球治理体系变革已经初步形成良性的互动关系,还意味着全球治理的制度设计和运作模式步入新的时代。因此,世界政治将逐步朝着代表更多数国家和人民的政治方向转变,国际体系也将逐步转化为全方位发展更具整体性的全球形态。     

G20与市民社会

本文主要探讨G20与市民社会的互动及其作用.首先将区分市民社会和非市民社会两个核心概念,然后探讨市民社会与G20互动的种类与方式.在此基础上,本文将分析市民社会对G20的影响,并概括市民社会与G20互动的类型、目标和参与方式.本文认为,市民社会通过对话、监督与评估、政策文件、替代峰会、抗议等方式对G20的进程、问责制、议程设置产生了积极影响,但这种影响目前还未能充分发挥.     

二十国集团在全球治理结构中的角色分析

二十国集团作为国际经济合作的主要平台,要在全球经济治理中发挥核心作用,需要处理好与其他国际机构的关系。二十国集团取代了八国集团在国际经济合作中的地位,并相对明确地划分了各自的议题领域;帮助国际货币基金组织和世界银行筹措资金,推动它们进行配额改革,并取得一定进展;承诺抵制贸易保护主义,推动世界贸易组织多哈回合谈判尽快结束;正努力与联合国建立互利合作的关系。     

行气调神针刺疗法对缺血性卒中后抑郁大鼠左前皮质及海马CREB和PDE4 mRNA表达的影响

目的 观察cAMP反应元件结合蛋白(cAMP response element binding protein,CREB)和磷酸二酯酶4(phosphodiesterase 4,PDE4)在缺血性卒中后抑郁(post stroke depression,PSD)发病中的作用及行气调神针刺疗法对其的影响。方法 将SD大鼠随机分为正常组、模型组、行气调神针刺组、西药组,每组各20只。采用大脑中动脉电凝结合应激和孤养的方法复制PSD模型。针刺组取“人中”、双侧“合谷”和双侧“太冲”,针刺治疗6周,西药组予以盐酸氟西汀灌胃治疗6周。采用RT-PCR检测左前皮质及海马CREB mRNA和PDE4 mRNA的表达水平。结果 最终各组样本量为11。与正常组比较,模型组大鼠左前皮质及海马CREB mRNA表达水平显著下调(P<0.01),PDE4 mRNA表达水平显著上调(P<0.01);与模型组比较,西药组及针刺组大鼠左前皮质及海马CREB mRNA表达水平显著上调(P<0.01),PDE4 mRNA表达水平显著下调(P<0.01)。结论 行气调神针刺疗法治疗PSD的机制与上调脑组织CREB mRNA的表达和下调PDE4 mRNA的表达有关。     

化瘀温经利湿法治疗慢性盆腔炎20例临床观察

目的观察化瘀温经利湿中药对慢性盆腔炎患者的疗效及对外周血CD4^＋CD25^＋CD127^lo调节性T细胞（regulative Tcells，Treg）的影响。方法将40例慢性盆腔炎患者按随机数字表法分为化瘀温经利湿中药治疗组20例和西药对照组20例，两组均以1个月为1个疗程，均治疗1个疗程，观察临床疗效及对症状出现率的影响；采用流式细胞术检测患者治疗前后外周血CD4^＋CD25^＋CD127^loTreg的数量及其在CD4^＋T淋巴细胞中所占的比例；并检测治疗前后血沉（erythrocyte sedimentation rate，ESR）和C反应蛋白（C—reactive peptide，CRP）水平。结果与对照组比较，治疗组总有效率和CD4^＋CD25^＋CD127^loTreg表达水平显著升高，ESR、CRP及症状出现率显著降低（P〈0．05）。结论化瘀温经利湿中药治疗慢性盆腔炎的作用机制，可能与其上调CD4^＋CD25^＋CD127^loTreg表达水平，促进免疫调节，降低炎症反应有关。     

多花黄精多糖PcUER1基因的克隆与表达分析

目的探究安徽生产的多花黄精多糖3,5-异构酶/4-还原酶基因(PcUER1)的结构基因信息及其在多花黄精中单糖鼠李糖化合物生源路径中的表达调控机制。方法以多花黄精为研究对象,基于其转录组学数据,克隆PcUER1基因并针对该cDNA序列展开生物信息学分析,采用实时荧光定量PCR方法检测多花黄精不同组织中PcUER1基因的表达水平。结果多花黄精多糖PcUER1基因的cDNA序列长度为900 bp,编码299个氨基酸;序列分析表明多花黄精与百合科虎眼万年青的相似度达到92.03%;实时荧光定量PCR检测结果显示,PcUER1基因在多花黄精的根、须根、茎、叶中表达水平逐渐降低,茎和叶中PcUER1基因表达水平的差异无统计学意义。结论多花黄精多糖PcUER1基因的活性位点有辅因子结合基序和催化四分体基序,其蛋白表达产物理化性质稳定。     

Lipidic compounds found in soils surrounding human decomposing bodies and its use in forensic investigations – A narrative review

Following decomposition of a human body, a variety of decomposition products, such as lipids, are released into the surrounding environment, e.g. soils. The long-lasting preservation in soils and their high diagnostic potential have been neglected in forensic research. Furthermore, little is known about the preservation, chemical transformation, or degradation of those human derived lipids in soils. To date, several studies identified various lipids such as long-chain free fatty acids and steroids in soils that contained decomposition fluids. Those lipids are preserved in soils over time and could serve as markers of human decomposition in forensic investigations, e.g. for estimating the post-mortem interval or identifying the burial location of a human body. Therefore, this review focuses on the current literature regarding fatty acid and steroid that have been detected in soils and associated with human body decomposition. After a short introduction about human decomposition processes, this review summarises fatty acid and steroid analysis applied in current case studies and studies related to taphonomic research. This review provides an overview of the available studies that have used fatty acids and steroids as identifiers of human decomposition fluid in soils in a forensic context and discusses the potential for developing this innovative field of research with direct application in a forensic context.     

Informing regional taphonomy research using retrospective forensic anthropology cases in the Western Cape,South Africa

The post-mortem interval (PMI) is important in death investigations as it can assist in reconstructing the context of the case and the identification of the unknown individual. However, in some instances the PMI is challenging to estimate due to the absence of regional taphonomy standards. To conduct accurate and locally relevant forensic taphonomy research, investigators require insight into the regional hotspot recovery areas. Thus, forensic cases examined by the Forensic Anthropology Cape Town (FACT) in the Western Cape (WC) province of South Africa between 2006 and 2018 (n = 172 cases; n = 174 individuals) were retrospectively reviewed. In our study, a considerable number of individuals did not have the PMI estimations (31 %; 54/174) and the ability to estimate a PMI was significantly associated with skeletal completeness, unburnt remains, absence of clothing and the absence of entomological evidence (p < 0.05 for each). Significantly fewer cases had the PMI estimated after FACT was formalised in 2014 (p < 0.0001). One third of cases with PMI estimations were made with large open-ended ranges, making them less informative. Factors significantly associated with these broad PMI ranges were fragmented remains, absence of clothing and absence of entomological evidence (p < 0.05 for each). Most decedents (51 %; 87/174) were discovered in police precincts from high crime areas, yet a considerable number (47 %; 81/174) were also found in low crime and sparsely populated areas regularly used for recreational activities. Common sites of body discovery were vegetated areas (23 %; 40/174), followed by the roadside (15 %; 29/174), aquatic environments (11 %; 20/174) and farms (11 %; 19/174). Decedents were discovered exposed (35 %; 62/174), covered with items such as bedding or shrubs (14 %; 25/174) or buried (10 %; 17/174). Our data highlight gaps in forensic taphonomy studies and clearly informs what regional research is needed. Overall, our study demonstrates how forensic case information can inform regional forensic taphonomy studies to locate common areas and contexts for the discovery of decomposed bodies and encourages similar studies in other areas of the world.