扩增12S rRNA基因鉴定生物检材种属

目的建立一种能够在同一反应条件下鉴定多个具体物种．又满足简单、快速、特异、灵敏、准确等实用要求的种属鉴定方法。方法从GenBank中获取人、鸡、鸭、鹅、猪、兔、鼠、绵羊、水牛、狗、山羊等11个物种的12SrRNA基因序列．设计一对针对上述11个物种的通用引物和分别针对人、鸡和鸭的特异引物,同时扩增各物种12SrRNA基因。以通用引物扩增片段为内部对照．以特异引物扩增片段用于人、鸡和鸭的种属鉴定,并分别对人、鸡、鸭单一检材以及人和鸡、人和鸭、鸡和鸭等二元混合DNA进行鉴定。结果通用引物扩增,各物种均有400bp左右的扩增片段：特异引物只对各自目标种属有扩增产物,片段大小：人163bp、鸡286bp、鸭374bp;测序结果与GenBank既有序列比对,Identities分值：人100％、鸡99％、鸭100％;通用引物扩增人、鸡和鸭检材的灵敏度为2．5Pg;特异引物扩增灵敏度人为2．5pg,鸡、鸭均为200Pg;混合DNA中任一种DNA的含量只要高于检测灵敏度即可被准确检出．不受另一种DNA量的干扰：盲测结果准确。结论本方法可以利用同一种PCR反应条件鉴定多个物种的种属。     

Hair analysis for cocaine: factors in laboratory contamination studies and their relevance to proficiency sample preparation and hair testing practices

Since the introduction in 2001 of a urine-based detection method for recombinant erythropoietin (rHuEPO), transfusion-doping practices have regained interest. To address this problem, an efficient antidoping test designed to obtain direct proof of allogeneic blood transfusion was developed and validated. This test, based on flow cytometry analysis of red blood cell (RBCs) phenotypes, was used to determine the absence or the presence of numerous RBCs populations in a blood sample. A such, it may constitute a direct proof of an abnormal blood population resulting from homologous transfusion. Single-blind and single-site studies were carried out to validate this method as a forensic quality standard analysis and to allow objective interpretation of real cases. The analysis of 140 blood samples containing different percentages (0-5%) of a minor RBCs population were carried on by four independent analysts. Robustness, sensitivity, specificity, precision and stability were assessed. ISO-accredited controls samples were used to demonstrate that the method was robust, stable and precise. No false positive results were observed, resulting in a 100% specificity of the method. Most samples containing a 1.5% minor RBCs population were unambiguously detected, yielding a 78.1% sensitivity. These samples mimicked blood collected from an athlete 3 months after a homologous blood transfusion event where 10% of the total RBCs present in the recipient originated in the donor. The observed false negative results could be explained by differences in antigen expression between the donor and the recipient. False negatives were more numerous with smaller minor RBCs populations. The method described here fulfils the ISO-17025 accreditation and validation requirements. The controls and the methodology are solid enough to determine with certainty whether a sample contains one or more RBCs populations. This variable is currently the best indicator for homologous blood transfusion doping.     

Comparing the performance of IBIS and BulletTRAX-3D technology using bullets fired through 10 consecutively rifled barrels

This study evaluates the abilities of the Integrated Ballistics Identification System (IBIS) and BulletTRAX-3D electronic imaging systems to identify bullets fired by the same weapon in a large database of images. Ten consecutively rifled handgun barrels were test fired to obtain reference sample and known match sample pairs for upload onto both bullet acquisition systems. Both copper-jacketed and lead bullets were uploaded, to account for variations in the manner in which markings are reproduced on the different metal compositions. Ranked correlation lists were examined and evaluated. For copper-jacketed bullet correlations, both IBIS and BulletTRAX-3D identified all reference samples to their known matches within the top 10 positions. For lead bullets, BulletTRAX-3D identified all reference samples to their known match in the top 10 positions while IBIS identified only 30%. For inter composition comparisons, BulletTRAX-3D was more successful than IBIS, identifying 100% of reference samples to their known match in the top 20 for copper-jacketed to lead comparisons and 90% for lead to copper-jacketed comparisons. These results suggest that BulletTRAX-3D is more effective than IBIS in the analysis of a wider range of bullet types and it was also found to produce images of superior quality.     

Why football players may benefit from the ‘shadow of the transfer system’

Transfer restrictions have a long tradition in professional sports but came under heavy attack in recent years (e.g. Bosman ruling, Monti system). Based on a bargaining model with stochastic player productivity, we show that less restrictive transfer rules reallocate ex post bargaining power from players to clubs. This reallocation is efficient and in the ex ante self-interest of players. The right to charge transfer fees enables clubs to insure their players. The players, in turn, benefit by converting risky future income into riskless current income. Overall, player utility is higher under more than under less restrictive transfer rules.

Eintragung eines Bestandrechts ins Grundbuch – dingliche Wirkung der "Einverleibung"?

Zwar spricht § 19 GBG von der "Einverleibung oder Vormerkung von Bestandrechten" und § 1095 ABGB beim eingetragenen Bestandvertrag von einem dazu gewordenen "dinglichen Recht". In Wirklichkeit ?hnelt aber die grundbücherliche Eintragung eines Bestandrechts eher einer Anmerkung; ihre Rechtsfolgen beschr?nken sich – und zwar blo? im Verh?ltnis zwischen Bestandgeber und Bestandnehmer ohne allgemeine dingliche Wirkung gegenüber Dritten! – auf § 1120 und § 1121 ABGB.     

C/S、B/S结构相结合的公安院校远程招生系统设计

本文提出了建立基于C/S、B/S体系结构相结合的公安院校远程招生系统,给出了总体设计方案,包括系统结构、系统模块功能和数据库表结构,提出了系统设计的原则,介绍了系统所采用的软件平台和所使用的基本技术。     

复合扩增检测D9S302、D18S865和PLA2A基因座多态性

应用 PCR复合扩增技术、变性聚丙烯酰胺凝胶电泳和银染法显色检测技术,对云南省汉族人群 100名个体的 D9S302、 D18S865和 PLA2A基因座进行了研究,分别检出 10、 7和 7个等位基因,基因型频率分布均符合 Hardy－ Weinberg平衡,家系调查证实三基因座的传递遵循孟德尔遗传规律。三基因座累积个人识别率为 0.999 7,累积非父排除率为 0.992 9。证实了复合扩增 D9S302、 D18S865和 PLA2A三基因座是法医学个人识别和亲权鉴定中极有价值的检测方法。     

刑事诉讼的双重证明标准

刑事诉讼证明中程序证明标准是一个新概念 ,该概念与实体证明标准并列。通过对两者的比较、分析及其运行的探讨 ,为刑事诉讼证明标准科学化、理性化注入了诉讼公正与正当程序要求 ,为实现诉讼文明提供了实质性条件     

美国强大的原因及发展趋势

美国强大的原因可以从势、道、制、术、器与士（即国际格局与国际力量对比、美国的意识形态与核心价值体系、政治经济与社会制度、科技与战略政策制定、经济与军事硬实力、人才培养与储备机制等方面）进行分析。由于新兴国家崛起,美国单极体系已经终结,美国霸权相对削弱,但是美国仍将在相当长的一段时间之内维持“一超”的地位。从劳动生产率、基础科研实力及研发投入、高等教育体系、外资投资环境、人口结构以及新兴产业等因素考察,美国经济长远来看仍具有较大的相对优势。未来美国霸权依然存在,美国二战后所确立的以“结构自由主义”为特征的国际秩序是美国霸权能够持久的最重要的基础,也是二战后西方国家之间的关系能够超越“零和”博弈格局的重要原因。美国对华战略并非遏制,而是“对冲/两面下注”。中美之间存在超越历史上传统大国“零和”博弈的可能,中国领导人提出建立中美新型大国关系的建议反映了这种战略远见。