首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   45篇
  免费   1篇
法律   43篇
政治理论   3篇
  2019年   1篇
  2017年   1篇
  2014年   2篇
  2013年   1篇
  2012年   2篇
  2011年   5篇
  2010年   2篇
  2009年   3篇
  2008年   4篇
  2007年   5篇
  2006年   12篇
  2003年   1篇
  2002年   1篇
  2001年   1篇
  2000年   1篇
  1999年   1篇
  1998年   1篇
  1997年   2篇
排序方式: 共有46条查询结果,搜索用时 15 毫秒
1.
The validity and feasibility of using DNA collection cards in the field for preservation and analysis of Cannabis sativa genotypes were investigated using a highly specific hexanucleotide marker. Collection cards were submitted to the National Marijuana Initiative, which selectively trained and managed the collection of specific types of samples from a variety of participating agencies. Samples collected at seizure sites included fresh marijuana leaf samples, dried "dispensary" samples, U.S. border seizures, and hashish. Using a standardized PCR kit with custom-labeled oligonucleotide primers specific to marijuana, collection cards produced eight genotypes and 13 different alleles, extremely low baselines, and no cross-reactivity with control plant species. Results were produced from all sample types with the exception of hashish. Plant DNA collection cards represent an easily implementable method for the genetic identification and relatedness of C. sativa street and grow site-seized samples with applications for databasing and market disruption.  相似文献   
2.
This paper aims to examine the role of individual resources in explaining African political participation. If political participation is costly and requires inputs in terms of individual resources, and citizens in young developing country democracies face comparatively high participation costs and have more limited individual resource endowments than citizens in more established democracies, a resource approach to political participation should be particularly relevant in the African setting. On the contrary, however, empirical findings drawing on recent data for more than 27,000 respondents in 20 emerging African democracies suggest weak explanatory power of the resource perspective. Often, the relatively resource poor actually participate to a greater extent than the more resource rich. The results are encouraging in that they suggest fairly broad-based political participation, but also call attention to the need to evaluate the motivational forces behind the decision to take part.  相似文献   
3.
Abstract: The quality and efficiency of a standard organic DNA isolation method and a silica‐based method using the QIAGEN Blood Maxi Kit were compared to obtain human DNA and short tandem repeats (STRs) profiles from 39 exhumed bone samples for paternity testing. DNA samples were quantified by real‐time PCR, and STR profiles were obtained using the AmpFlSTR® Identifiler® PCR amplification kit. Overall, the silica‐based method recovered less DNA ranging from 0 to 147.7 ng/g (average 7.57 ng/g, median = 1.3 ng/g) than did the organic method ranging from 0 to 605 ng/g (average 44.27 ng/g, median = 5.8 ng/g). Complete profiles (16/16 loci tested) were obtained from 37/39 samples (95%) using the organic method and from 9/39 samples (23%) with the silica‐based method. Compared with a standard organic DNA isolation method, our results indicate that the published silica‐based method does not improve neither the quality nor the quantity of DNA for STR profiling.  相似文献   
4.
Abstract: We have developed a concept to enable the analyzing of degraded stains with limited DNA template quantity. Therefore we have constructed a short tandem repeat (STR) multiplex including the German DNA database systems (Q8). The amplicon lengths are smaller than 280 bp. For the validation of Q8 over 50 degraded samples were investigated. Amplifications were performed with “low copy number” PCR, the number of PCR cycles was increased to 33 and the reaction volume was decreased to 12.5 μL. Compared with the MPX2 and Nonaplex kit, the average success rate was increased using the Q8 kit by approximately 20% and 30%, respectively. The efficiency of a sensitive STR multiplex with reduced amplicon lengths was confirmed in comparing the success rates of Q8 for typing degraded samples and samples with limited amount of DNA template while partial profiles were observed with the majority of the samples using commercially available kits.  相似文献   
5.
FUT2/01基因座在中国北方汉族人群中的多态性   总被引:1,自引:0,他引:1  
目的调查STR基因座FUT2/01在中国人群中的基因结构特征及其在中国人群中的多态性分布特点,并对其法医学应用前景进行探讨。方法应用PCR方法扩增FUT2/01基因,DNA测序确定所有等位基因的序列;常规聚丙烯酰胺凝胶电泳调查中国人群中FUT2/01基因座的多态性分布,同时应用荧光标记引物进行自动化检测分析和基因型鉴定。结果DNA测序结果仅显示核心序列的重复数目变化所导致的长度差异;在所调查的中国汉族人群162例个体中共发现9种等位基因和28种基因型,系统的个体识别率为0.9639,父权排除率为0.6266。此外,荧光标记引物经自动化检测可对该基因座进行良好的分型。结论FUT2/01基因座在中国汉族人群中表现出高度的杂合性和个体特异性,在法医学鉴定中具有较高的应用价值。  相似文献   
6.
A developmental validation study based on recommendations of the Scientific Working Group on DNA Analysis Methods (SWGDAM) was conducted on a multiplex system of 10 Cannabis sativa short tandem repeat loci. Amplification of the loci in four multiplex reactions was tested across DNA from dried root, stem, and leaf sources, and DNA from fresh, frozen, and dried leaf tissue with a template DNA range of 10.0-0.01 ng. The loci were amplified and scored consistently for all DNA sources when DNA template was in the range of 10.0-1.0 ng. Some allelic dropout and PCR failure occurred in reactions with lower template DNA amounts. Overall, amplification was best using 10.0 ng of template DNA from dried leaf tissue indicating that this is the optimal source material. Cross species amplification was observed in Humulus lupulus for three loci but there was no allelic overlap. This is the first study following SWGDAM validation guidelines to validate short tandem repeat markers for forensic use in plants.  相似文献   
7.
8.
POPULATIONS: This study reports the genetic polymorphism observed at 15 short tandem repeat loci D3S1358, TH01, D21S11, D18S51, D5S818, D13S317, D7S820, D16S539, CSF1PO, vWA, D8S1179, TPOX, D2S1338, D19S433, and FGA in four aboriginal populations of Bengal. The analysis was performed to decipher the suitability of CODIS as well as six other highly polymorphic and unlinked markers in Forensic Testing. Studied populations include four tribes: Karmali, Kora, Maheli, and Lodha.  相似文献   
9.
采用复合扩增、PAG电泳分离和银染检测技术,对广西壮、汉族人群的F13A01、FESFPS、vWA等3个STR基因座进行遗传多态性研究.3个基因座的基因型在广西壮、汉族人群的频率分布均符合Hardy-wein-berg平衡.3个STR基因座在广西壮族人群的个体识别力(DP)分别为0.8205、0.8566和0.9239;在广西汉族人群的个体识别力(DP)分别为0.8256、0.8455、0.9191.  相似文献   
10.
Sudden infant death syndrome (SIDS) constitutes a considerable percentage of infant death of unknown etiology. Individual catecholamine response variation is suspected to play a role in SIDS. TH01 is a tetrameric short tandem repeat marker in the tyrosine hydroxylase gene, which regulates gene expression and catecholamine production with allele 9.3 exerting a particularly strong effect on noradrenaline production. We investigated in an age-controlled study the TH01 allele frequencies in 127 cases of SIDS and 406 control cases to assess whether in SIDS cases a distinct TH01 allele distribution could be determined as has been reported by a previous study. We found that genotypes containing one or two 9.3 alleles were significantly more frequent in SIDS patients (58.2%) than in control subjects (48.4%, p=0.038), whereas all other alleles were more frequent in the control subjects. Our findings support the notion that there exists a significant association between TH01 gene configuration and SIDS.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号