GC/MS衍生化测定精浆中游离支链氨基酸和果糖

目的 建立人精浆中支链氨基酸和果糖的气相质谱衍生化分析方法.方法 精液样本液化离心后,按精子活率的临床标准分为正常组和非正常组,经TMS微波衍生化,GC/MS分析两组支链氨基酸、果糖衍生物含量差异.结果 正常组与非正常组的缬氨酸,亮氨酸,异亮氨酸在相对含量上均有一定差异.正常组3种氨基酸相对含量高于非正常组.果糖分析观察到同样的特征,正常组相对含量高于非正常组.结论 精子活率低的精浆样本仍可检出支链氨基酸和果糖,其差异有助于无精子、少精子精斑的法医学鉴别.     

The patterns and prevalence of mass murder in twentieth-century America

Even though previous research has not examined mass murder prior to 1965, scholars have asserted that the mid-1960s marked the onset of an unprecedented and ever-growing mass murder wave. Using news accounts and the FBI's Supplementary Homicide Reports (SHR) as sources of data, this study analyzes 909 mass killings that took place between 1900 and 1999. Although the mid-1960s marked the beginning of a mass murder wave, it was not unprecedented, because mass killings were nearly as common during the 1920s and 1930s. The results also show that familicides, the modal mass murder over the last several decades, were even more prevalent before the 1970s. Moreover, mass killers were older, more suicidal, and less likely to use guns in the first two-thirds of the 20th century. Although some have claimed that workplace massacres represent a new “strain” in mass murder, the findings suggest that the only new type of mass killing that emerged during the 20th century was the drug-related massacre.     

GC/MS法联合分析生物检材中的尼美舒利、二氧丙嗪

目的建立生物检材中尼美舒利、二氧丙嗪的GC/MS检验方法。方法采用浸取法提取,GC/MS定性检验,内标法选择离子检测（SIM）模式定量检验。结果最低回收率为69%,尼美舒利的线性相关系数为0.998,克咳敏的线性相关系数为0.9973。结论该方法操作简便快速,提取率高,可用于实际案件中尼美舒利、二氧丙嗪的检验。     

顶空GC／MS法检验血液中的硫化氢

目的建立血液中硫化氢的气相色谱质谱联用分析方法。方法取心血3mL-5mL,置于20mL顶空瓶中,加入1g氯化钠,加3mL-5mL蒸馏水,加入2mol／L盐酸1mL,加盖密封,混匀后于80℃水浴中加热20min。取液上气体0．5mL进样分析。结果在中毒死亡者的心血中检出硫化氢,保留时间参考值为3．6min。结论该方法可用于刑事案件中硫化氢的快速分析。     

Toward multidimensional information: A derivatization-free UHPLC-QqQ MS/MS method for amino acid components of fingerprint

The analysis of fingerprint chemical composition is a meaningful way to excavate the multidimensional information of fingerprint, including the donor profiling information and the age of a fingerprint, which broadens the evidential values of fingerprint, especially for the partial and distorted fingerprint. But the research remains still in the pilot phases or is ongoing. Amino acids are the dominant organic substances in latent sweat fingerprint and influenced by many donor factors. Hence, their content reflects personal information of donors. Forensic science will be revolutionized if suspects can be individualized by their amino acid content. The diverse nature, distinct physicochemical properties, and ultra-micro levels of amino acids present in fingerprints make it hard to detect. A high sensitivity method for detecting and quantifying multiple amino acid components is required. UHPLC-QqQ MS/MS offers high sensitivity, high separation, simultaneous multicomponents detection, and no derivatization, making it an ideal method for detecting and analyzing amino acids in fingerprints. Therefore, in this study, we propose and validate an efficient UHPLC-QqQ MS/MS method for the extraction and analysis of 13 amino acids from fingerprint. We compared the results of amino acids of 10 different substrates and found that the inherent amino acids in most porous substrates would have been extracted along with the fingerprint amino acids, making them unsuitable for quantitative amino acid analysis. Instead, plastic sheets are ideal substrates for laboratory studies. Then, extensive experiments were conducted among 30 donors for multidimensional information analysis. The type of samples analyzed were eccrine-rich fingerprints. A Binary Logistic Regression (BLR) model was developed, and the female and male donors were successfully differentiated by amino acids in fingerprints. Two other mathematical models were also developed to verify the accuracy, and all three different mathematical models were able to identify donors of different genders with over 90% accuracy. This demonstrates that amino acids have the potential to provide more information for donors as metabolic markers. In the future, we will conduct a series of experiments to analyze more multidimensional information for individual identification by amino acid content in the fingerprint.     

SPE-GC／MS检测生物样品中利多卡因、罗哌卡因、布比卡因

目的建立生物样品中利多卡因、罗哌卡因、布比卡因的固相萃取提取方法和气质检测方法。方法采用Oasis HLB固相萃取柱,以GC／MS定性定量。结果生物样品中利多卡因、罗哌卡因、布比卡因平均萃取回收率达74％以上,检测限0．01μg／mL,线性关系良好,相关系数R2=0．9900以上。结论方法操作简便快速,萃取回收率高,重现性好,可用于实际案件。     

Oversight Effectiveness and Political Will: Some Lessons from West Africa

The purpose of the present note is to advance two theoretical claims. The first claim proposed is that the impact of the availability of oversight tools and of the most broadly understood legislative capacity (availability of material, technical, financial resources; availability of well-trained staff) on the effectiveness with which legislative oversight is performed is conditional. The second claim put forward, after reviewing a rich body of work on executive–legislative relations and legislative oversight in West Africa, is that, of the various conditions that promote or prevent the effective use of oversight tools and capacity, political will is the single most important. These claims have both theoretical and practical relevance, for if political will is as important as is claimed for the effective performance of the oversight function, then international organisations may have to reconsider their approach to legislative strengthening.     

GC Analysis of Black Gel Pen Ink Stored under Different Conditions

In many criminal and civil cases in China, the most commonly questioned documents are those written with gel pen ink. An important task for forensic document examiners is to identify whether two or more ink entries in one or more documents were written with the same ink type. The identification of the age of gel ink entries made poses an important and difficult problem for forensic document examiners. In this paper, the volatile components of gel ink were determined and the gel ink was classified by gas chromatography with a flame ionization detector. Calibration curves were created to express the relationship between the content of volatile gel ink components and the age of gel ink entries stored under natural and UV‐induced aging conditions. The correspondence between the natural and UV‐induced aging conditions was also established. The experimental results showed that GC was useful in the analysis of black gel ink and applicable for determining the relative age of gel ink entries under certain conditions.     

Subaltern connections: Brazilian critical geographers,development and African decolonisation

Abstract

This article explores the relations to Africa and African decolonisation of three key figures in Brazilian critical geographies and development studies, Manuel Correia de Andrade (1922–2007), Josué de Castro (1908–1973) and Milton Santos (1926–2001). Based on an analysis of their works and unpublished archives, I argue the radical Third World perspectives these intellectuals expressed anticipated later critiques of development as a neocolonial device. Drawing upon current literature on decolonisation, international conferencing and anti-racist solidarity networks, I discuss these matters in relation to these authors’ interest in cultural diversity and internal colonialism. Crucially, they developed this sensitivity in the Brazilian Northeast, a region especially shaped by Afro–Brazilian and Indigenous cultural legacies. While supporting anti-imperialist nationalisms in the Third World, these Brazilian scholars fostered multilingual, internationalist and cosmopolitan activism and scholarship. This is revealed by the study of the transnational networks they developed during exile and the various persecutions that many of them suffered after the 1964 military coup. Finally, I argue these works can substantiate recent claims to ‘decolonise’ geography and development studies, on the condition that these fields of study take seriously their anti-imperial traditions and their ‘voices from the South’.     

State transformation goes nuclear: Chinese National Nuclear Companies’ expansion into Europe

Abstract

Most of the literature on state transformation focuses on China’s relations with African, Asian and Latin American countries and the National Oil Companies’ overseas expansion to show that China has become fragmented, decentralised and internationalised. This article contributes novel findings by focusing on China’s relations with Europe and the actions of China’s National Nuclear Companies (NNCs). It shows that NNCs, which have become relatively autonomous actors, often pursue their agendas of expansion into Europe without much coordination with, or even in contradiction to, other ministries’ agendas and interests, especially the Ministry of Foreign Affairs. Instead of being orchestrated by the central government, their expansion reflects considerable disorganisation and sometimes undermines China’s official strategy. The article demonstrates this through case studies of NNCs’ involvement in the UK and Romania.