Animal DNA in PCR reagents plagues ancient DNA research

Molecular archaeology brings the tools of molecular biology to bear on fundamental questions in archaeology, anthropology, evolution, and ecology. Ancient DNA research is becoming widespread as evolutionary biologists and archaeologists discover the power of the polymerase chain reaction (PCR) to amplify DNA from ancient plant and animal remains. However, the extraordinary susceptibility of PCR to contamination by extraneous DNA is not widely appreciated. We report the independent observation of DNA from domestic animals in PCR reagents and ancient samples in four separate laboratories. Since PCR conditions used in ancient DNA analyses are extremely sensitive, very low concentrations of contaminating DNA can cause false positives. Previously unidentified animal DNA in reagents can confound ancient DNA research on certain domestic animals, especially cows, pigs, and chickens.     

The role of the chair in informal international organisations: Australia’s Group of Twenty presidency

Scholars of international relations have devoted significant effort to understanding international organisations. However, two areas have been understudied: the role of the chair in international multilateral negotiations and the role of informal international organisations. Yet informal international organisations are increasingly important in international affairs as world leaders turn to smaller and more flexible forums to address global challenges. This article addresses these two blind spots in the literature by considering the role of Australia as chair in one of the most important yet most understudied informal international organisations: the Group of Twenty (G20). Drawing on primary interview data and the participant observations of the first author, who was a member of the G20 chair in 2013–14 during Australia’s presidency, the authors examine two theoretical puzzles: (1) why states delegate control of the negotiation process to a chair and (2) how the chair can, and does, influence the negotiation process. It is argued that member states delegate control to the chair to overcome specific institutional failures and, in doing so, provide the chair with the power to influence the negotiation process. The authors also argue that the G20 case indicates that existing theory overlooks key factors which restrict the capacity of the chair to influence the negotiation outcome.     

The Genealogical Society Library of Salt Lake City: A Source of Data for Economic and Social Historians

Abstract. Some important novelists have written a great novel early in their careers and have produced lesser works thereafter, whereas others have improved their work gradually over long periods and have made their major contributions late in their lives. Which of these patterns a novelist follows appears to be systematically related to the nature of his work. Conceptual writers typically have specific goals for their books, and they produce novels that emphasize plot; experimental writers' intentions are often uncertain, and their novels more often stress characterization. By examining the careers of 12 important modern novelists, the author demonstrates that conceptual novelists—including Herman Melville, F. Scott Fitzgerald, and Ernest Hemingway—are generally those who have declined after writing landmark early novels, while, in contrast, experimental novelists—including Charles Dickens, Mark Twain, and Virginia Woolf—have typically arrived at their most important work later in their careers. As is the case for modern painting and poetry, the ranks of great modern novelists have included both conceptual young geniuses and experimental old masters.     

A tribute and a review

On 8–9 May 2010, a deprived chengzhongcun (urban village) in the city of Hefei hosted a session of the Second Hefei Contemporary Art Biennale. In this article, we focus on the artistic practices and the online and offline discussions that they evoked. Drawing upon literature on citizenship, public art, public space and public pedagogy, we analyse the exhibition and its social and political potentialities. Looking at a case study in a country where fear of an aggressive crackdown is part and parcel of the psychology of urban protest, we reflect upon the pedagogical potential of public art in the struggle for equal rights to housing, education and urban space. By paying special attention to the geographical and the pedagogical dimensions of this extraordinary event, we demonstrate that public art can play a role in Chinese citizenship struggles.