Evaluating microfossil content of dental calculus from Brazilian sambaquis

To date, limited numbers of dental calculus samples have been analyzed by researchers in diverse parts of the world. The combined analyses of these have provided some general guidelines for the analysis of calculus that is non-destructive to archaeological teeth. There is still a need for a quantitative study of large numbers of calculus samples to establish protocols, assess the level of contamination, evaluate the quantity of microfossils in dental calculus, and to compare analysis results with the literature concerning the biology of calculus formation. We analyzed dental calculus from 53 teeth from four Brazilian sambaquis. Sambaquis are the shell-mounds that were established prehistorically along the Brazilian coast. The analysis of sambaqui dental calculi shows that there are relatively high concentrations of microfossils (phytoliths and starch), mineral fragments, and charcoal in dental calculus. Mineral fragments and charcoal are possibly contaminants. The largest dental calculi have the lowest concentrations of microfossils. Biologically, this is explained by individual variation in calculus formation between people. Importantly, starch is ubiquitous in dental calculus. The starch and phytoliths show that certainly Dioscorea (yam) and Araucaria angustifolia (Paraná pine) were eaten by sambaqui people. Araceae (arum family), Ipomoea batatas (sweet potato) and Zea mays (maize) were probably in their diet.     

Detecting the medieval cod trade: a new method and first results

This paper explores the potential of stable isotope analysis to identify the approximate region of catch of cod by analysing bones from medieval settlements in northern and western Europe. It measures the δ¹³C and δ¹⁵N values of cod bone collagen from medieval control samples collected from sites around Arctic Norway, the North Sea, the Kattegat and the Baltic Sea. These data were considered likely to differ by region due to, for example, variation in the length of the food chain, water temperature and salinity. We find that geographical structuring is indeed evident, making it possible to identify bones from cod caught in distant waters. These results provide a new methodology for studying the growth of long-range trade in dried cod and the related expansion of fishing effort—important aspects of the development of commercialisation in medieval Europe. As a first test of the method, we analyse three collections of cod bones tentatively interpreted as imported dried fish based on a priori zooarchaeological criteria. The results tentatively suggest that cod were being transported or traded over very long distances since the end of the first millennium AD.     

CONCEPTS OF RISK AND SAFETY IN TOXIC SUBSTANCES REGULATION: A COMPARISON OF FRANCE AND THE U.S.

The notions of risk and safety which play a conspicuous role in the regulation of toxic substances have shown a markedly different evolution in France and the United States. American law has moved toward the development of statutory criteria of risk assessment, balancing both the costs and benefits of regulation, while the French legislator has consistently avoided a substantive elaboration of safety concepts through legal texts. This contrast is documented and its implications for the discretionary authority of regulating agencies discussed. Divergent national patterns are explained with reference to four factors distinguishing the legal and political systems of the two countries.     

Reviews

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The Arts of Persia, ed. R. W. Ferrier, New Haven and London: Yale University Press, 1989, 334 pp, $60.00.

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Reviews

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Response from the author

This article is part of a review symposium of Sheila Cavanagh's book Queering bathrooms: gender, sexuality and the hygienic imagination, 2010, Toronto, University of Toronto Press, 295 pp., £19.94 (paperback), ISBN 978-1-4426-10736