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Eighteen external quality assessment (proficiency testing) samples were prepared from client specimens collected with the Intercept® oral fluid collection device and by spiking drug-free oral fluid. Samples were circulated in pairs at quarterly intervals to 13 UK and USA based laboratories for analysis by a panel of OraSure micro-plate Intercept® enzyme immunoassay kits and hyphenated mass spectrophotometric techniques. During the survey, there was a single case of non-specificity in a false report for methadone. The major errors were of lack of sensitivity relative to the concentration thresholds specified for the immunoassays. The sensitivity for overall ‘present’/‘not found’ reports calculated as true positives/(true positives + false negatives) were for the amfetamine specific assay 50%, methyl-amfetamines 93%, barbiturates 64%, cannabinoids 73%, cocaine and metabolites 100%, benzodiazepines 69%, methadone 95%, opiates 79% (opiates excluding oxycodone 93%), phencyclidine 93% and human gamma-globulin 97%. A small number of the sensitivity errors were attributable to errors in chromatographic confirmation techniques.  相似文献   
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Reviews     
Susan Gross Solomon (ed.), Beyond Sovietology: Essays in Politics and History. New York and London: M.E. Sharpe, 1993, 254 pp., £38.00.

Alice H. Amsden, Jacek Kochanowicz & Lance Taylor, The Market Meets Its Match. Restructuring the Economics of Eastern Europe. Cambridge, MA: Harvard University Press, 1994, 250 pp.

Robert E. Ebel, Energy Choices in Russia. Washington, DC: Center for Strategic and International Studies, 1994, xii + 152 pp., $16.95.

Michael Waller, The End of the Communist Power Monopoly. Manchester: Manchester University Press, 1993, viii + 287 pp., £35.00 h/b., £9.99 p/b.

Minxin Pei, From Reform to Revolution: The Demise of Communism in China and the Soviet Union. Cambridge, MA: Harvard University Press, 1994, 253 pp., £29.95.

William G. Rosenberg & Lewis H. Siegelbaum (eds), Social Dimensions of Soviet Industrialisation. Bloomington and Indianapolis, IN: Indiana University Press, 1993, xix + 296 pp., £12.99 p/b.

Taras Kuzio & Andrew Wilson, Ukraine: Perestroika to Independence. Basingstoke: Macmil‐lan Press, 1994, xiv + 260 pp., £40.00.

Russell F. Farnen (ed.), Nationalism, Ethnicity, and Identity. Cross National and Comparative Perspectives. New Brunswick, NJ, and London: Transaction, 1994, xiv + 538 pp., £49.95.

Edwin Thomas Bacon, The Gulag at War: Stalin's Forced Labour System in the Light of Archives. Basingstoke: Macmillan, 1994, xii + 190 pp.

Robert S. Ross, China, the United States and the Soviet Union: Tripolarity and Policy Making in the Cold War. Armonk, NY: M. E. Sharpe, 1993, x + 204 pp., £42.00.  相似文献   

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If manufacturing a safer cigarette is technically possible--an open question--then mandating that tobacco manufacturers improve the safety of cigarettes would likely have both positive and negative implications for the nation's health. On the one hand, removing toxins may reduce the incidence of smoking-related diseases and premature mortality in smokers. On the other hand, smokers might be less inclined to quit, those who have quit might resume the habit, and youth who have never smoked will have one less reason to avoid tobacco use. To assess the expected population health impacts of a legislative or regulatory mandate, we created the Tobacco Policy Model, a system dynamics computer simulation model. The model relies on secondary data and simulates the U.S. population over time spans as long as 50 years. Our simulation results reveal that even if requiring cigarettes to be safer makes smoking more attractive and increases tobacco use, a net gain in population health is still possible.  相似文献   
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As digital era open government initiatives are deployed globally, researchers are debating their effects on democratic governance. We develop a framework to evaluate whether these initiatives improve or undermine democratic governance and apply it to the case of Government of Canada Wikipedia editing and an automated Twitter account (@gccaedits) tracking this activity. Through content analysis of edits and analysis of access to information requests we show that while most edits made are useful and non-partisan, the response of news media and government managers ultimately renders the editing a threat to democratic governance. This complexity highlights the importance of assessing the merits of open government initiatives in their broader socio-political context. The findings also suggest that more fundamental shifts in contemporary political, media and administrative cultures are necessary before the potential benefits of open government reforms can materialize.  相似文献   
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In the context of the ongoing international debate concerning the efficacy or otherwise of the NPT and IAEA in preventing or managing nuclear proliferation, Australia's undertaking to enter a nuclear cooperation agreement with the People's Republic of China (PRC), once identified as a “strategic competitor” of Australia's major alliance partner the United States (US), suggests that Australia's approach to proliferation issues is being re-evaluated. This paper argues, utilising an analysis of the relationship between the evolving US approach to nuclear issues and Australian policy, that the Howard government's evolving approach to nuclear issues can be characterised as an attempt to balance the competing imperatives of maintaining Australia's reputation as a nuclear non-proliferation standard bearer, regional strategic and economic considerations and the weight of the Australia-US alliance.  相似文献   
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