Aquatic resources in human diet in the Late Mesolithic in Northern France and Luxembourg: insights from carbon,nitrogen and sulphur isotope ratios

We investigated the contribution of freshwater resources to the diet of seven Late Mesolithic hunter-gatherers (ca. 5300–7000 BC) from Northern France and Luxembourg using stable isotope ratios. In addition to the carbon and nitrogen stable isotope ratios (δ¹³C, δ¹⁵N), we explored the potential of the sulphur isotopic ratios (δ³⁴S) to detect and quantify the proportion of protein derived from aquatic foodstuff. In only two sites, animal remains from an associated settlement were available and subsequently examined to decipher the isotopic differential between terrestrial and freshwater resources. The quantification of their relative contribution was simulated using a Bayesian mixing model. The measurements revealed a significant overlap in δ¹³C values between freshwater and terrestrial resources and a large range of δ¹⁵N values for each food category. The δ³⁴S values of the aquatic and terrestrial animals were clearly distinct at the settlement in the Seine valley, while the results on fish from Belgium demonstrated a possible overlap in δ³⁴S values between freshwater and terrestrial resources. Local freshwater ecosystem likely contributed to ca. 30–40 % of the protein in the diet of the individuals found in the Seine settlement. Out of this context, the isotopic signature and thus contribution of the available aquatic foods was difficult to assess. Another potential source of dietary protein is wild boar. Depending on the local context, collagen δ³⁴S values may contribute to better assessment of the relative contribution of freshwater and terrestrial resources.     

EMERGENCE OF LEAPFROGGING FROM RESIDENTIAL CHOICE WITH ENDOGENOUS GREEN SPACE: ANALYTICAL RESULTS

Leapfrog development is a typical form of sprawl. This paper aims at analyzing the existence, size, and persistence of leapfrogging in a dynamic urban economic model with endogenous green amenities. We analyze whether incoming households choose to settle at the fringe of the city or to jump further away depending on their preferences and the structure of the city. We first provide an analytical treatment of the conditions and characteristics under which a first leapfrog occurs and show how the optimal choice is affected by the size of the city, income, commuting costs, as well as the size of the area where green amenities are considered. We then study how further leapfrogging and multiple urban rings may appear and be maintained in the long‐run equilibrium, and how infill processes take place through time.     

All Aboard! Travel Films,Railroads, and the North American West, 1897–1910

Beginning with the first travelogues of the late 1890s, the film and tourism industries collaborated both directly and indirectly to shape representations of North America’s western landscape and its people. These non-narrative motion pictures intersected with the rise of mass consumerism, modern tourism, the forces of imperialism and colonialism, as well as industrialized forms of transportation. In particular, railroad travel films from the Canadian Pacific Railway Company and the Northern Pacific Railway Company transformed motion-picture goers into armchair tourists, exposing audiences to the scenic wonders of the West. These transcontinental railroads, themselves products of nation-building initiatives, competed against one another to increase passenger traffic by marketing the sublime and often overlapping landscapes of the American and Canadian Wests as potent nationalist and unifying symbols that heralded each country’s uniqueness.     

A Covering Tour Model for Planning Mobile Health Care Facilities in SuhumDistrict, Ghama

The provision of adequate primary health care in developing countries is often troublesome. The problem is to provide a sufficient number of facilities to be geographically accessible, yet few enough to be properly stocked and staffed. In many less developed countries accessibility problems are exacerbated by extensive rainy seasons in which travel is only possible on paved roads. Using the covering tour model we investigate the use of mobile facilities to resolve this dilemma in Suhum District, Ghana. The model minimizes a mobile facility's travel while serving all population centers within range of a feasible stop. Computational results show that in the rainy season the model cannot provide full coverage; over six percent of the population is beyond a covering distance of eight kilometers. In the dry season, 99 percent of the population can be served by a tour at a covering distance of seven kilometers.Beyond a distance of four kilometers, the dry season problem becomes a trade-off between the distance traveled by healthcare patrons and mobile facilities. These results illustrate the importance of flexibility of mobile systems: if accessibility cannot be provided in all seasons it may still be provided at favorable times of the year.     

La philosophie dans les sciences

Sans résumé novembre 2000 Dominique Lecourt est président du Comité d'éthique de l'Institut de recherche pour le développement (IRD) et professeur de philosophie à l'université de Paris 7 où il dirige le centre Georges-Canguilhem (case courrier 7041, 2 place Jussieu, F-75251 Paris Cedex 05).     

Thirty years of science studies: knowledge,society and the political

This article explores the last 30 years of science studies. It presents what the author takes to be some of the main questions raised in this field, the solutions most of its practitioners advocated, and what informed their intellectual and political attitudes. It tries to place the social studies of knowledge in a broader perspective, linking it to parallel changes in anthropology, sociology and history, and it questions its relations to social change on the one hand, and to the political on the other. It closes with a critique of some, often dominant, attitudes in the STS field.