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.     

THE IMPACT OF ECONOMIC OPPORTUNITY, AMENITIES AND FISCAL FACTORS ON AGE-SPECIFIC MIGRATION RATES

ABSTRACT. Migration models have considered several different categories of determinants, including economic opportunities, amenities, and state and local fiscal factors. Migration has also been shown to depend on the individual's position in the life cycle. This paper represents a first attempt to integrate all three categories of determinants of migration into a life-cycle framework. Empirical findings generated from a countrywide model of white male migration, over the period 1970 to 1980, reveal that all three types of determinants are important. Specifically, economic opportunities are most influential for males during their working years. Amenities are also found to follow a life-cycle pattern with older migrants more attracted to amenable locations than their younger cohorts. Finally, state income and death taxes display life-cycle effects; working males in their peak earning years are detracted by high income taxes while all migrants aged 55 to 69 avoid counties in states with high inheritance and estate taxes.     

Doubts about How the Middle Horizon Collapsed (ca. A.D. 1000) and Other Insights from the Looted Cemeteries of the Lower Ica Valley,South Coast of Peru

This paper presents new information from funerary contexts in the lower Ica Valley, on the south coast of Peru, spanning two millennia from the end of the Early Horizon to the Late Intermediate Period. Although severely looted, these sites can still yield valuable information. We discuss their architecture and material culture in the context of radiocarbon dates. Among other findings, these cast new light on the poorly understood transition from the Middle Horizon to the Late Intermediate Period, for which a paucity of archaeological data from ca. a.d. 1000–1250 has long been taken as evidence of an environmentally- or socially-induced demographic collapse. Yet the data we present here suggest that the basins of the lower Ica Valley were likely occupied continuously over this period, and that the echoes of Wari influence here may have lasted longer than previously thought.     

France’s ‘elites’, Islamophobia,and communities of friendship in Sabri Louatah’s Les Sauvages

Sabri Louatah’s Les Sauvages (2011–2016) joins an ongoing discussion over the French political class’s relationship with the racial and religious divides in contemporary French society. Louatah portrays the political class as imposing from above a divide between French descendants of Muslim immigrants and their majority-culture compatriots, and suggests that the functioning of the modern state makes this necessary: states are founded upon communities of belonging which require the exclusion of given minorities, and will reimpose that exclusion with force if a more inclusive model of community threatens to emerge. Two readings of how Les Sauvages suggests we should respond to this are possible. One suggests that subjects should reject the state entirely, seeking to form inclusive communities escaping its control. Another suggests that the structures of the modern state should be appropriated to promote inclusion, but that the nature of modern democracy will prevent such action from succeeding completely; as such, traditional political engagement must work in conjunction with more radical attempts to form communities free from exclusion. Both readings, however, hold in common the idea that racial and religious divides are imposed from above and that these divides cannot be completely overcome while working within mainstream political structures.     

The coastal landslides of Shetland

Little is known of hard-rock coastal landsliding in Scotland. We identify 128 individual coastal landslides or landslide complexes >50 m wide along the coasts of Shetland. Most are apparently translational slides characterized by headscarps, displaced blocks and/or debris runout, but 13 deep-seated failures with tension cracks up to 200 m inland from cliff crests were also identified. Thirty-one sites exhibit evidence of at least localized recent activity. Landslide distribution is primarily determined by the distribution of coastal cliffs >30 m high, and they are preferentially developed on metasedimentary rocks. Analysis of 16 landslides on Fetlar (NE Shetland) indicates that most are translational dip-slip failures; 3 represent deep-seated failures and several exhibit active frontal erosion attributable to basal sapping by storm waves. As these landslides terminate in shallow water, failure was probably initiated when rising sea level resulted in footslope erosion and upslope propagation of instability, causing downslope displacement of landslide blocks on upper slopes. ¹⁰Be exposure dating of two headscarps yielded ages of 4.8?±?0.2 ka and 4.4?±?0.2 ka, consistent with the onset of footslope erosion as sea level rose. Our results suggest that landslides have played a hitherto undocumented but important role in retreat of cliffed coastlines in Scotland.     

Death by a Thousand Cuts: an archaeological assessment of souveniring and salvage on the Australian cruiser HMAS Perth (I)

In 2014, the Australian National Maritime Museum (ANMM) received reports from recreational divers that the shipwreck site of HMAS Perth (I) was being systematically salvaged by commercial divers. After extensive discussions with Indonesian Government departments and agencies the ANMM led the first Australian/Indonesian remote sensing survey of Perth in December 2016. This was followed by an in‐water survey in May 2017. These investigations revealed Perth has been devastated by systematic, large‐scale unauthorized salvage. Following the survey, ANMM and its Indonesian research partner Pusat Penelitian Arkeologi Nasional (ARKENAS), working in conjunction with the Royal Australian Navy and Australian Department of Foreign Affairs and Trade, successfully lobbied the Indonesian Government to have the site declared Indonesia's first Marine Protected Area.     

Beyond NIMBY

Using survey data, this study tests competing hypotheses about the nature of opposition to a hazardous waste incinerator. Using a multivariate model, we challenge some of the basic assumptions of the Not In My Backyard (NIMBY) label typically used to characterize opposition. We find little evidence for components of the NIMBY label such as concern about property values and aesthetics, but find instead that opposition is related primarily to trust in government, fear of health consequences, and other ideological or demographic factors. We conclude with a discussion urging facility proponents to gain a better understanding of the nature of opposition and of the complexities of public opinion.     

Modeling the Uncertainty of Slope and Aspect Estimates Derived from Spatial Databases

Estimates of slope and aspect are commonly made from digital elevation models (DEMs), and are subject to the uncertainty present in such models. We show that errors in slope and aspect depend on the spatial structure of DEM errors. We propose a general-purpose model of DEM errors in which a spatially auto-regressive random field is added as a disturbance term to elevations. In addition, we propose a general procedure for propagating such errors through GIS operations. In the absence of explicit information on the spatial structure of DEM errors, we demonstrate the potential utility of a worst-case analysis. A series of simulations are used to make general observations about the nature and severity of slope and aspect errors.