Elemental analysis and characterization of ochre sources from Southern Arizona

Iron oxides and other associated minerals (ochre) were widely used in ancient times, however, the use and procurement of these materials is not well understood and there has been little research on the elemental characterization of the material compared to other artifact classes. To assess the possibility of identifying ochre differences between locations, the original potential geological sources should be thoroughly characterized. This paper describes the collection of potential geologic sources of ochre in the Tucson basin of Arizona, sampling of those sources, instrumental neutron activation analysis (INAA), and subsequent multivariate analysis of the data. This paper has several goals, including characterizing geochemical trends within and between ochre sources, identifying the important elements in geochemical characterization of ochre, and establishing a database for further investigations. This preliminary study indicates that the inter- and intra-source variations in geological sources of ochre in the Tucson basin region can be differentiated. Future analysis of iron oxide artifacts will be performed to examine correlations between artifacts and sources and provide a basis for further deductions concerning ancient ochre procurement.     

The effect of charring and burial on the biochemical composition of cereal grains: investigating the integrity of archaeological plant material

Stable isotope analysis of charred archaeobotanical cereal grains has the potential to provide direct evidence of crop growing conditions in the past and to refine palaeodietary predictions. If isotope values of archaeobotanical material are to be considered robust, it is necessary to characterise the compositional changes associated with their charring and burial. This study used a suite of analytical techniques, including FT-IR and solid state ¹³C NMR, to characterise changes in the biochemical composition of modern einkorn grains with heating at 230 °C for 2 h, 4 h, 8 h and 24 h, encompassing conditions that replicate their undistorted ancient counterparts. The biochemical composition of archaeobotanical charred einkorn grains was also investigated by FT-IR and solid state ¹³C NMR in order to assess the changes in composition which occur during burial. Results of FT-IR and solid-state ¹³C NMR show that heating of modern einkorn grains resulted in Maillard reactions between cereal proteins and starch, forming high molecular weight melanoidins, which contain both alkyl and aromatic carbon. Loss of low molecular weight carbon and nitrogen-containing volatiles resulted in a slight but non-systematic increase in the δ¹³C values and a systematic increase of 0.8‰ in the δ¹⁵N values of the charred einkorn grains. Solid-state ¹³C NMR shows that the ancient charred einkorn grains consisted entirely of aromatic carbon and retained a similar proportion of nitrogen to their modern 24 h charred counterparts, despite a significantly lower concentration of amino acids. This indicates that the amino acid nitrogen in the ancient charred grains was retained in the stable melanoidins whose polymeric structure makes them resistant to subsequent degradation.     

‘Working of the Train Gang’: Alienation,Liminality and Communitas in the UK Preserved Railway Sector

The article initially draws upon the notion of non‐alienated labour to explain the motivations of volunteers who offer their time and expertise freely to the running of steam and diesel locomotives within UK preserved railways. It suggests that in this instance the concept is flawed in that volunteers operate outside the cash nexus. In drawing upon the anthropological concepts of liminality and communitas it aims to develop the notion of non‐alienated labour by adding a subjective dimension. It argues that volunteers working on preserved railways are modern‐day pilgrims through their moving in and out of different identities as they seek solace in the certainty of operating and working in complex and highly satisfying workplaces.     

Gentrification Interrupted in Salford,UK: From New Deal to “Limbo‐Land” in a Contemporary Urban Periphery

This paper examines two potential lacunae in understanding low‐income residents’ experiences of contemporary state‐led gentrification via a study of neighbourhood restructuring in Salford, UK, 2004–2014. The first is the localised politics preparing the ground for neighbourhood “redevelopment” and housing demolition. The second is the blighted social landscape which emerges with the subsequent stalling of this project. A focus on “before” and “after” is adopted in order to disrupt the linear policy and “effects” temporalities that much qualitative gentrification research tends to inhabit. We see how state‐led neighbourhood restructuring does not simply displace, but carries residents from “empowerment” to abandonment and transfers them from active struggle into devitalised limbo. As such, the paper demarcates challenges and opportunities for resident mobilisation inherent in a vacillating urban renewal programme, powerful in its inception but which has since “hit the buffers” (Lees 2014, Antipode 46(4):921–947) in light of global and municipal fiscal crises.