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151.
A gas chromatography–mass spectrometry (GC–MS) method was developed and validated for the simultaneous qualification and quantification of methamphetamine (MA), amphetamine (AP), 3,4-methylenedioxy-N-methylamphetamine (MDMA), 3,4-methylenedioxy-N-amphetamine (MDA), ketamine (KET) and norketamine (NKT) in fingernails. Fingernail samples (20 mg) were washed with distilled water and methanol, digested with 1.0 M sodium hydroxide at 95 °C for 30 min, and then extracted with ethyl acetate. Extract solutions were evaporated to dryness, derivatized using heptafluorobutyric anhydride (HFBA) at 60 °C for 30 min, and analyzed by GC–MS. The linear ranges were 0.1–20.0 ng/mg for AP, MDMA and NKT, 0.2–20.0 ng/mg for MA and MDA, and 0.4–20.0 ng/mg for KET, with the coefficients of determination (r2 ≥ 0.9989). The intra- and inter-day precisions were within 7.1% and 10.6%, respectively. The intra- and inter-day accuracies were ?10.9% to 0.8% and ?4.3% to 4.5%, respectively. The limits of detections (LODs) and the limits of quantifications (LOQs) for each analyte were lower than 0.094 ng/mg and 0.314 ng/mg, respectively. The recoveries were in the range of 72.3–94.9%. The average fingernail growth rates of two subjects for three years and six subjects for two months were 3.12 mm/month and 3.16 mm/month, respectively. The method proved to be suitable also for the simultaneous detection and quantification of MA, MDMA, KET and their metabolites in fingernails. 相似文献
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After Hong Kong is integrated with mainland China in July 1997, the economic and political environments of the two places will inevitably link up with each other. Economic modernization significantly not only improves the living conditions of the Chinese, but also alters their social structure and political values. As such, economic prosperity and democracy become the two conflicting values in Hong Kong and China during the transition to 2000. The people of Hong Kong and China are presented a choice over two mutually exclusive targets: economic prosperity vs. democracy. On the one hand, the choice for economic prosperity will imply no democracy because a conservative political system will be maintained to preserve the political status quo. On the other hand, the choice for democracy will imply no economic prosperity, because democratization will be suppressed and hence the economy will suffer as a result of political instability. However, neither of these two choices could offer the people of Hong Kong and China a genuine prosperity and stability. Therefore a congruent relationship between the economy and the political system must be established and maintained. As prosperity is contributed by both economic growth and political stability, neglection of either of these two elements will not result in a long‐lasting prosperity. Thus, economic development and democratization are two complementary rather than contradicting forces on the road to development in China. 相似文献
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Tae Ho Lee 《Communication Law & Policy》2016,21(2):251-279
The number of public records requests has significantly increased in recent years, burdening authorities with limited resources and manpower. State and local governments argue that they should be allowed to recoup more fees to recover the costs incurred for processing public records requests, but many commentators warn that exorbitant fees can function as a tactic of delay and intimidation. This article reviews public records statutes, case law and recent legislative reform efforts concerning the determination of the scope of public records fees, finding that unclear statutory language and widely different approaches have made the determination of public records fees difficult. The study argues that statutory reform is called for in order to clearly delineate the specific tasks for which public records fees can be imposed. 相似文献
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Political Behavior - Election reform has allowed citizens in many states to choose among convenience voting methods. We report on a field experiment that tests messages derived from theories about... 相似文献