Discrimination of Geographical Origin of Asian Garlic Using Isotopic and Chemical Datasets under Stepwise Principal Component Analysis

Isotopic compositions of δ²H, δ¹⁸O, δ¹³C, and δ¹⁵N and concentrations of 22 trace elements from garlic samples were analyzed and processed with stepwise principal component analysis (PCA) to discriminate garlic's country of origin among Asian regions including South Korea, Vietnam, Taiwan, and China. Results indicate that there is no single trace‐element concentration or isotopic composition that can accomplish the study's purpose and the stepwise PCA approach proposed does allow for discrimination between countries on a regional basis. Sequentially, Step‐1 PCA distinguishes garlic's country of origin among Taiwanese, South Korean, and Vietnamese samples; Step‐2 PCA discriminates Chinese garlic from South Korean garlic; and Step‐3 and Step‐4 PCA, Chinese garlic from Vietnamese garlic. In model tests, countries of origin of all audit samples were correctly discriminated by stepwise PCA. Consequently, this study demonstrates that stepwise PCA as applied is a simple and effective approach to discriminating country of origin among Asian garlics.     

Sequencing,resistance and forced innovation: a longer view of china's financial reforms

Gradualist in nature, China's economic reform has been criticized as being wrongly sequenced. Serious problems of inertia and delayed changes, particularly in the macroeconomic and financial spheres have built up since 1979. To rectify the situation, the Chinese government launched in 1994 major reform initiatives covering taxation, central and commercial banking, and the foreign exchange system. This paper looks at the historical background to these financial reforms from the perspective of sequencing and examines the factors behind their partial and uneven successes.     

An extremely sensitive species-specific ARMs PCR test for the presence of tiger bone DNA

The survival of the tiger (Panthera tigris) is seriously threatened by poaching to provide raw materials for Traditional Chinese Medicines (TCMs). Most highly prized are the tiger's bones, which are used in combination with other animal and plant derivatives in pills and plasters for the treatment of rheumatism and other ailments. Hundreds of patent remedies have been produced which claim to contain tiger bone, but proof of its presence is needed, if legislation prohibiting the trade in endangered species is to be enforced. A highly sensitive tiger-specific real-time PCR assay has been developed to address this problem. Using primers specific to the tiger mitochondrial cytochrome b gene, successful amplification has been reliably achieved from blood, hair and bone as well as from a range of TCMs spiked with 0.5% tiger bone. Although capable of detecting fewer than 10 substrate molecules, the seven varieties of TCM pills and plasters tested showed no detectable trace of tiger DNA before spiking. Furthermore, sequencing several "tiger bone" fragments seized from TCM shops has shown that they actually originated from cattle and pigs. The potential effects of traditional bone preparation methods, evidence that much lower concentrations are used than alleged on TCM packaging, and substitution of bones from other species all suggest a low likelihood of detecting tiger DNA in patent medicines. Despite this, the basic methods have been thoroughly proven and can be readily applied to derivatives from other CITES protected species providing a rapid and highly sensitive forensic test for species of origin. Potential applications to the monitoring of wild populations are demonstrated by the successful identification of shed hairs and faecal samples.     

A note on the aggregation of slack and shortage in centrally planned economies

This note attempts to identify the key methodological problems that remain unsolved in the controversy about the aggregation of slack and shortage in disequilibrium econometric models of centrally planned economies (CPEs). The procedure of ‘smoothing by aggregation’ implemented by Burkett (1988) is critically reviewed and found wanting, despite possible attribution to Kornai (1980) for justification. We argue that the procedure neglects the problems of resource immobility and hoarding that have prevailed in CPEs. Even from a neo-Keynesian perspective, it is at odds with a rigorous microeconomics of rationing that takes into full account the substitution and income effects of spillovers. One important issue is that saving may actually be reduced because of a tightening of the ration. These considerations throw serious doubt on the validity of the smooth trade-off between slack and shortage that forms the basis for econometric estimation and lead to concern that the Walrasian configuration cannot be identified from the estimation results.     

Ma Ying-jeou's re-election: implications for Taiwan and East Asia

Abstract

Ma Ying-jeou's re-election means that there will not be a leadership change in Taiwan, but it still has significant implications. It forces the opposition Democratic Progressive Party (DPP) to work out a succession for itself and confront the political reality that it must now persuade voters in Taiwan that it can manage relations with mainland China effectively in order to win the presidency again. It also requires Ma to define clearly the limits of his mainland policy in order to minimize Beijing's expectations of his second term, as no president of Taiwan can agree to move towards political integration without a popular mandate. On its part, Beijing has taken on board the significance of Taiwan's electoral cycle for managing cross-Strait ties and will put pressure on Ma to move forward over political integration and thus reduce the scope for a future DPP administration to reverse course. This notwithstanding, Beijing's Taiwan policy will ultimately be determined more by the result of the leadership succession in mainland China itself in the autumn of 2012. For USA and East Asia, Ma's re-election is a positive development as it minimizes the risk of a confrontation or a crisis across the Taiwan Strait. But it will not remove the main problems they have with China that are Taiwan related. For USA, arms sales to Taiwan will still be needed and will remain a source of tension with Beijing. For Southeast Asia, stability across the Taiwan Strait implies that Beijing can devote more attention and resources to the South China Sea territorial disputes and that it is likely to behave in a more assertive way.     

Comparative advantage and trade liberalization in China

The relevance of Ricardo's theory of comparative advantage to the design of trade policy by developing and socialist countries is the subject of heated argument, particularly among Marxists who have yet to produce a satisfactory theory of international exchange based on value analysis. The debates among economists in China on their country's ‘open-door’ policy revealed the complexity of the central and related issues. Besides the possibility of being exploited and becoming dependent on developed economies, on which theorists of unequal exchange have sounded a good many warnings, developing countries also face other problems and dangers when they allow themselves to be guided by Ricardo's doctrine in conducting external trade, as the Chinese experience of trade liberalization in 1979–85 vividly demonstrated. This paper first presents an interpretative summary of the debates among the Chinese economists and then analyses what went wrong in the process of liberalization.     

Inferring the population of origin of DNA evidence within the UK by allele-specific hybridization of Y-SNPs

Marked differences in Y-SNP allele frequencies between continental populations can be used to predict the biogeographic origin of a man's ancestral paternal lineage. Using 627 samples collected from individuals within the UK with pale-skinned Caucasian, dark-skinned Caucasian, African/Caribbean, South Asian, East Asian or Middle Eastern appearance we demonstrate that an individual's Y-SNP haplogroup is also strongly correlated with their physical appearance. Furthermore, experimental evaluation of the Marligen Signet Y-SNP kit in conjunction with the Luminex 100 detection instrument indicates that reliable and reproducible haplogrouping results can be obtained from 1 ng or more of target template derived from a variety of forensic evidence types including, blood, saliva and post-coital vaginal swabs. The test proved highly male-specific with reliable results being generated in the presence of a 1000-fold excess of female DNA, and no anomalous results were observed during degradation studies despite a gradual loss of typable loci. Hence, Y-SNP haplogrouping has considerable potential forensic utility in predicting likely ethnic appearance.     

The Hong Kong economy: Opportunities out of the crisis?

The Hong Kong economy has been heavily influenced by the ‘China factor’ and an imbalance in the property sector. Down the path of ‘Manhattanization’, a lopsided economic structure emerged in the pre‐1997 era, which would be inconsistent with the framework of ‘one country, two systems‘. While transition politics resulted in a lack of effective responses by the last colonial government, after the take‐over the SAR Chief Executive Tung Chee Hwa unveiled a partial reform package with long‐term targets. His attempt met with the unanticipated consequences of the bursting of the local economic bubble and the East Asian financial crisis. The prospect of a structural reform for the Hong Kong economy is hanging in the balance. This paper looks at the factors that have been shaping the Hong Kong economy and speculates about the direction in which it may be heading in a time of global turbulence.