Towards an early warning system for oxidative degradation of protein fibres in historical tapestries by means of calibrated amino acid analysis

Flemish 15–17th century tapestries are among the most precious testimonies of European cultural heritage. Even in their deteriorated condition, they are still highly valued and exhibited in many museums all over the world. The present state of degradation evidenced by visual assessment in conservation practice, and confirmed with macro-scaled tensile strength tests, reveals the vulnerability of the wool and silk fibres to light exposure.     

Early iron age buffalo hunters on the Kadzi river, Zimbabwe

The faunal sample from Kadzi, an Early Iron Age site in the Zambezi Valley, is the first substantial sample for that period and region in Zimbabwe. The site appears to have been a permanent or semipermanent settlement. The sample consists mainly of bovid remains, dominated by buffalo as a single species, suggesting special hunting skills. The presence of some domestic animals proves that these animals were available to the inhabitants of the site. Their status in the community is, however, uncertain. Possible explanations for the small number of cattle fragments could be the result of paucity of livestock for environmental or other reasons, or may reflect differential disposal of cattle bones as part of ritual expression. Environmental conditions, particularly the possible presence of the tsetse fly, could also have been a factor in determining the distribution of livestock and herd sizes in the region. The faunal remains provide valuable insight into the subsistence strategies of the period. They also provide evidence about animals present in the region during the first millennium AD.

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Résumé  Des restes animaux provenant du Kadzi, un site de l’age du fer supérieur dans la vallée du Zambeze, fournissent pour la première fois des données pour cette période et cette région du Zimbabwe. Le site a été probablement occupée d’une manière permanente ou semipermanente. Les restes se composent principalement d’ossements bovins, dominés par le Buffle comme seule espèce, ce qui temoigne de techniques de chasse avancées. La présence (parmi les ossements) d’un certain nombre d’animaux domestiques indique qu’ils étaient disponibles pour les habitants du site, mais leur statut dans la communauté reste ambigu. Le nombre peu élève de fragments d’ossements de boeuf est peutêtre lié à la taille réduite du troupeau pour des raisons environnementales ou autres ou bien résulte de l’utilisation rituelle de certains ossements. Les conditions environnementales et plus particulièrement la présence probable de la mouche Tse Tse ont pu également être des facteurs determinant pour la repartition du boeuf dans la région et la taille du troupeau. Ces restes faunistiques fournissent ainsi des informations importantes aussi bien sur les stratégies de subsistance pour la période considérée que sur les animaux présents dans la région au cours du 1er millénaire AD.

     

Removal of natural organic dyes from wool–implications for ancient textile provenance studies

Ancient wool textiles recovered from archaeological sites are in many cases originally dyed with natural organic dyestuffs from vegetable sources. These include among others woad (Isatis tinctoria L.), weld (Reseda luteola L.), and madder (Rubia tinctorum L.). These dyestuffs could be a threat to the use of the strontium isotopic system as a tracer for provenance studies of ancient wool, because they could potentially contaminate the signature of the textile's raw material. We present a novel method which allows for efficient removal of organic dyestuffs in wool prior to strontium isotopic analysis. Our method is based on an oxidative release of the dyestuff constituents by ammonium peroxodisulfate [(NH₄)₂S₂O₈] solution, combined with hydrofluoric acid (HF) that has shown to effectively remove/dissolve adhering dust micro-particles. Our multi-analytical results show that such a pretreatment is capable of removing >98% of the originally present organic dyestuffs without significantly destroying the wool structure. The strontium isotopic ratios of the residual wool fraction after the application of the pretreatment are sensitive to the origin and, therefore, can be used as tracers for the provenance of the raw material. We propose to apply this method to ancient wool textiles in which positive identification of organic dyestuff constituents by High Performance Liquid Chromatography (HPLC) was made.     

Meaning in the making: The potter’s wheel at Phylakopi,Melos (Greece)

It is now commonly accepted that technology is, to its very core, a social product through which we can explore cultural choices. This cultural dimension of technology will be examined with reference to the introduction and use of the potter’s wheel at Phylakopi on Melos (Greece) during the Late Bronze Age. At this site, the co-existence of two different manufacturing techniques was so deeply embedded that, despite the presence of hybrid vessels, many aspects of the pottery production had become linked to either a local (hand-built) or Minoanising (wheel-thrown) tradition. It will be argued that the traditional hand-building technique was associated with individual and rooted facets of the Melian identity (such as kinship, social class, or gender). Reasons for the initial stimulus for adoption of the potter’s wheel are considered to lie in its potential for competitive social practice through association with exotic, symbolically laden technologies, craft products and consumption rituals. The gradual application of the technology to ever more complex vessels, on the other hand, corresponds to the apprenticeship sequence outlined by Roux and Corbetta and may indicate an incomplete learning process or a certain lack of practice opportunities among local potters.     

Location and collaboration: Manufacturing firms' use of knowledge intensive services in product innovation

The paper addresses the relation between geographical location of firms and collaboration with knowledge intensive service providers on product innovation in a small country setting. The analysis shows that even in a small country with limited geographical distances firms located in peripheral areas are less likely to be broad users of collaboration with knowledge intensive service providers in the process of product innovation than firms located in major urban areas. However, it is only amongst firms located in the periphery that collaboration strategy seems to matter in the sense that differences in development in employment can be detected between broad and rare users of collaboration.     

Immigration,new religious symbols,and the dynamics of neighborhoods

Last decades' non-western immigration to Europe has resulted in culturally and religiously more diverse populations in many countries. One manifestation of this diversification is new features in the cityscape. Using a quasiexperimental approach, in which an unexpected political process that led way to the first public call to prayer from a mosque in Sweden is combined with rich, daily, information on housing sales and detailed monthly information on internal migration, this paper examines how one such new feature affects neighborhood dynamics. While our results indicate that the calls to prayer increased house prices closer to the mosque, we find no evidence of increased residential segregation between natives and immigrants.