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Marta Concheiro Ana de Castro Oscar Quintela Manuel Lpez-Rivadulla Angelines Cruz 《Forensic Science International Supplement Series》2005,150(2-3):221
This paper describes the analytical methodology for the determination of MDMA, MDA, MDEA and MBDB in oral fluid. After a liquid–liquid extraction, the analysis was carried out by high performance liquid chromatography (HPLC), with fluorescence detection. The detector wavelength was fixed at 285 nm for excitation and 320 nm for emission. The mobile phase, a mixture of phosphate buffer (pH = 5) and acetonitrile (75:25), and the column, Kromasil 100 C8 5 μm 250 mm × 4.6 mm, allowed good separation of the compounds in an isocratic mode in only 10 min. The method was validated and showed good limits of detection (2 ng/mL) and quantitation (10 ng/mL) for all the amphetamine derivatives. No interfering substances were detected. A stability study of these compounds in oral fluid stored at three different temperatures (−18, 4 and 20 °C) over 10 weeks was conducted, showing a time-dependent degradation of the four compounds. 相似文献
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Marc Allen Eisner 《管理》2004,17(2):145-167
Increasingly, corporations are proactively managing environmental impacts in response to pressures from the consumer, business-to-business, financial, and government procurement markets. In many cases, these efforts have produced results well beyond what could be required under public regulations. Although the U.S. Environmental Protection Agency began a process of regulatory reinvention in the 1990s as a means of promoting such innovations, the results have been somewhat disappointing. This article examines the recent trends in corporate environmental management and regulatory reform. It concludes with a discussion of changes in regulatory design that could promote ongoing gains in corporate environmental performance through the creation of a hybrid system combining elements of public regulation, government-supervised corporate self-regulation, mandatory information disclosure, and green procurement. 相似文献
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The 2000 presidential election of opposition candidate Vicente Fox signaled an end to seven decades of Mexico's single-party regime and seemed to herald the advent of truly competitive politics. But by 2003, economic reform had largely stalled, and Fox's party suffered a historically unprecedented midterm' loss in the congress. This article analyzes the underpinnings of policy gridlock in the Fox administration. Fox inherited the need for microeconomic restructuring and increased competitiveness, more innovative and pragmatic state policies, the need to pay attention to the country's sharp income inequalities, and the challenge of crafting a political strategy that could build a middle ground and foster policy consensus. With his party's minority standing in the congress, Fox was constrained from the start by divided government. But more effective statecraft and coalition building would have helped. These will be essential elements for the success of any post-Fox regime. 相似文献
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Nine STRs loci have been typed in a sample from Córdoba (Argentina). 相似文献