Simultaneous determination of thirteen beta-blockers and one metabolite by gradient high-performance liquid chromatography with photodiode-array UV detection

A new rapid and sensitive high-performance liquid chromatography (HPLC) method has been developed for the simultaneous identification and quantification in human plasma of the 13 most commonly prescribed beta-blockers and one active metabolite-atenolol, sotalol, diacetolol, carteolol, nadolol, pindolol, acebutolol, metoprolol, celiprolol, oxprenolol, labetalol, propranolol, tertatolol and betaxolol. It involves liquid-liquid extraction procedures followed by liquid chromatography coupled to photodiode-array UV detection with a fixed wavelength at 220 nm for quantification. Compounds were separated on a 5 microm Hypurity C(18) (ThermoHypersil) analytical column (250 mm x 4.6 mm, i.d.) using a gradient of acetonitrile-phosphate buffer pH 3.8 at a flow rate of 1.0 ml/min. The total analysis time was 26 min per sample. Extraction recoveries were between 74 and 113% for the polar compounds and between 20 and 56% for the most apolar compounds. Calibration lines were linear in the range from 25 to 1000 ng/ml for all compounds excepted carteolol and nadolol (50-1000 ng/ml), all of them with coefficients of determination (r2 values) >/=0.994. Limits of detection (LODs) ranged from 5 to 10 ng/ml. Intra-assay and inter-assay precision and accuracy were studied at two concentration levels (100 and 500 ng/ml). The intra-assay coefficients of variation (CVs) for all compounds were 相似文献   

Forensic value of 14 novel STRs on the human Y chromosome

We identified and characterized 14 novel short-tandem-repeats (STRs) on the Y chromosome and typed them in two samples, a globally diverse panel of 73 cell lines, and 148 individuals from a European-American population. These Y-STRs include eight tetranucleotide repeats (DYS449, DYS453, DYS454, DYS455, DYS456, DYS458, DYS459, and DYS464), five pentanucleotide repeats (DYS446, DYS447, DYS450, DYS452, and DYS463), and one hexanucleotide repeat (DYS448). Sequence data were obtained to designate a repeat number nomenclature. The gene diversities of an additional 22 Y-STRs, including the most commonly used in forensic databases, were directly compared in the cell line DNAs. Six of the 10 most polymorphic markers include the newly identified Y-STRs. Furthermore, these novel Y-STRs greatly improved the resolution of paternal lineages, above the level obtained with commonly used Y-STRs, in the European-American population.     

HIV-related stigma and discrimination--the epidemic continues

This article is one of a series commissioned to mark the tenth anniversary of the Canadian HIV/AIDS Legal Network, discussing past developments and future directions in areas of policy and law related to HIV/AIDS. It looks at HIV-related stigma and discrimination. The article summarizes the present situation as described in reports from numerous countries throughout the world. It reviews the institutional, non-institutional, and structural dimensions of HIV-related discrimination. It also identifies some essential components of anti-discrimination efforts: legal protection; public, workplace, and health-care programs; community mobilization; and strategizing on the determinants of health.     

Compulsory HIV testing after an occupational exposure

In December 2001, the Ontario legislature passed Bill 105, authorizing a Medical Officer of Health to order blood testing of a source person in the event that emergency service workers and "good Samaritans" (as well as other categories of people) may have been exposed to a communicable disease. Similar legislation (Bill C-217) is before a committee of the House of Commons. This article discusses the value of information about the health status of the source person, Bill C-217 and Bill 105, current public health guidelines, recent Canadian research, and the conclusions of Backgrounder prepared by the Canadian HIV/AIDS Legal Network.     

Pulmonary embolism: a rare cause of sudden infant death

Pulmonary embolism can be observed at any age, but it occurs very rarely in the infant. The authors report the case of a 12-month-old boy who suddenly died during clinical improvement of gastroenteritis associated with otitis. Autopsy showed signs of dehydration and acute left pulmonary embolism, which was the cause of death. Thrombosis of the inferior vena cava extending into renal veins was seen. In this case, plasma hyperosmolality caused by dehydration might have favored the formation of venous thromboses. The various risk factors of pulmonary embolism in the child are discussed, including genetic factors.     

The European Central Bank: Independence, accountability and strategy: A review

This paper reviews research on central banking and monetary policy, with special emphasis on the position of the future European Central Bank. Nowadays, it is often thought that an independent central bank with an explicit mandate to aim for price stability constitutes an important institutional device to assure price stability. Indeed, the ECB will be one of the most independent central banks as follows from the codings of various indicators measuring legal independence. Still, it does not follow straightforwardly from the literature that the Statute of the ECB is optimal. It is also argued that the accountability of the ECB is poorly arranged for in comparison with that of several national central banks. Finally, the discussion about the monetary strategy of the ECB is reviewed.     

西部大开发中的城乡结构与城市化发展

在西部大开发的战略性基点上 ,具有核心意义的问题不是区域经济问题而是民族发展问题。西部少数民族问题与农民问题的交织 ,使城乡结构调整与城市化发展成为实现西部大开发战略意义的最基本和最迫切的问题。应突破以往的城市化思路和模式 ,以制度创新作为整个战略选择的基点并把中等城市的发展作为主攻方向 ,才能真正实现西部大开发的战略性意义     

A new method for the evaluation of matches in non-recombining genomes: application to Y-chromosomal short tandem repeat (STR) haplotypes in European males

A 9-locus microsatellite framework (minimal haplotype), previously developed for forensic purposes so as to facilitate stain analysis, personal identification and kinship testing, has been adopted for the establishment of a large reference database of male European Y-chromosomal haplotypes. The extent of population stratification pertaining to this database, an issue crucial for its practical forensic application, was assessed through analysis of molecular variance (AMOVA) of the 20 regional samples included. Despite the notion of some significant haplotype frequency differences, which were found to correlate with known demographic and historic features of Europeans, AMOVA generally revealed a high level of genetic homogeneity among the populations analyzed. Owing to their high diversity, however, accurate frequency estimation is difficult for Y-STR haplotypes when realistic (i.e. moderately sized) datasets are being used. As expected, strong pair-wise and higher order allelic associations were found to exist between all markers studied, implying that haplotype frequencies cannot be estimated as products of allele frequencies. A new extrapolation method was therefore developed which treats haplotype frequencies as random variables and generates estimates of the underlying distribution functions on the basis of closely related haplotypes. This approach, termed frequency 'surveying', is based upon standard population genetics theory and can in principle be applied to any combination of markers located on the Y-chromosome or in the mitochondrial genome. Application of the method to the quality assured reference Y-STR haplotype database described herein will prove very useful for the evaluation of positive trace-donor matches in forensic casework.