Degradation of collagen in parchment under the influence of heat-induced oxidation: Preliminary study of changes at macroscopic,microscopic, and molecular levels

This paper examines the impact of heat-induced oxidation for new and historical parchment with the purpose of improving diagnostic tools for use in practical parchment conservation. Oxidation was generated by heat aging at 120°C in a dry oven for 24, 48, and 96 hours, respectively. The degradation was assessed on all samples at macrolevel by measuring color changes, at microlevel by measuring the shrinkage temperature as well as by performing a visual assessment of the fibers’ morphology and determining the amount of damaged fibers, and finally, at molecular level where amino acid analysis was used to reveal changes in the oxidized collagen. The study shows that the heat-induced oxidation leads to significant color changes, decrease in hydrothermal stability, as well as changes in the amino acid composition. Surprisingly, the results show that the historical parchment is more sensitive towards dry heat oxidation on a molecular level than is the new parchment. Furthermore, for the first time, we can show that physical damage reflected in the morphological characteristics of fibers can be attributed to oxidation by dry heat.     

Poststructuralist approaches to empirical analysis

This article develops a range of concrete analytic approaches to empirical studies inspired by poststructuralist thinking. The analytic strategies offered provide examples of "putting deconstruction to work" in the context of the analysis of qualitative data. The discourse-destabilizing impacts are shown by examples derived from the author's own research and that of others. Among the analytic strategies, the author discusses the ways in which constructions of discursive categories and storylines can be investigated. And as a means of sharpening the discourse-transgressing lens, the use of troubling and alienating concepts and models of analysis is explored, together with the use of paradoxes and nonconventional renarrations of data. The approaches are not presented as directly transferable techniques. They are meant to work as inspiration for other researchers in their methodological development of analytic tools.     

How to create an action learning environment that makes self and social awareness business-like

Promoting open reflection and exploration on group dynamics is delicate work and is often considered ‘not very business-like’ in a business context. How to approach this work is a constant balance and struggle for action learning practitioners. In this account of practice, we present central elements in our action learning framework – Action Lab^® – where the design builds on Business Driven Action Learning. We share core ideas and assumptions behind our action learning approach, which is informed by a systems psychodynamic understanding of groups. This account of practice aims at sharing and discussing ideas and distinctive work modes for creating double awareness – i.e. how to maintain a balanced awareness of task and process and how to increase self and social awareness – in a performance-driven business contexts.     

Dimensional studies of specific microscopic fibre structures in deteriorated parchment before and during shrinkage

This paper reports the first systematic study of the dimensions of morphological changed microscopic collagen fibres in historical and new reference parchments with the aim to improve the knowledge on deterioration and the diagnosis of their damage in connection with conservation activities. The dimensions of fibres from the parchments were measured before and during shrinkage, with special emphasis on fibres with degradation characteristics designated as “pearls on a string” and “butterflies”. In addition, measurements of the total shrinkage of the length of fibres and pieces of parchment were also carried out. The observations support the assumption that in vivo transformation of the fibre structure by natural ageing is similar to that taking place when heating parchment and fibres in water. Based on statistical cluster analysis, four subpopulations of pearls representing different stages of deterioration are found. Moreover, the dimensional changes in the specific structures observed at room temperature can be related to specific temperatures in the interval of shrinkage suggesting that the hydrothermal stability of the fibres may be predicted on the basis of the ratio between length and width of the so-called pearls (P_l/P_w). The total shrinkage measured is drastic, in average around 56% for fibres and 43 to 48% for pieces of parchment depending on the direction of the skin. The total shrinkage of fibres corresponds to a mean change in the ratio P_l/P_w from around 10 to around 2.3. Finally, relations between the measured dimensions at the microscopic level with those of collagen at nanoscopic and molecular levels including known and potential chemical splitting points strongly indicate that the formation of the butterfly-like fragments formed by cleavage of two adjacent pearls in the fibre can be ascribed to chemical modification of specific tripeptides in the collagen molecule.     

Epistemological or Political? Unpacking Ambiguities in the Field of Interdisciplinarity Studies

This paper unpacks ambiguities in the field of interdisciplinarity studies (IDS), explores where they come from and how they inhibit consolidation of the field. The paper takes its point of departure in two central fault lines in the literature: the relationship between interdisciplinarity and disciplinarity and the question of whether integration is a necessary prerequisite for interdisciplinarity. Opposite positions on the fault lines are drawn out to identify sources of ambiguities, and to examine whether the positions are irreconcilable - or disagreements that may continue to coexist in a consolidated field. It is argued that if we envisage a consolidated field of IDS, there is a need to develop common ground which calls for scholars of ID to be more explicit about the meanings they ascribe to ID than we see today when the sliding between the epistemological and political dimensions of the field may go unnoticed. It is suggested that whereas ambiguity may be unwanted in the epistemological dimension, it may be quite useful in the political dimension. A systematic comparison of opposite positions offers a common frame of reference for a more productive dialogue between different positions. The analysis shows that as to integration, the difference between opposite positions can be reconciled, whereas in the relation between interdisciplinarity and disciplinarity, the positions are antagonistic and logically exclude each other. The analysis suggests that it is the premise of integration that creates the conditions of possibility for “relabelling” interdisciplinarity and for using the “silo” for disciplines.     

Bullying and social exclusion anxiety in schools

In this article, I develop a new conceptual framework, a new thinking technology, for understanding the bullying that takes place between children in schools. In addition, I propose a new definition of bullying. This new thinking technology reflects a shift in focus from individual characteristics to the social processes that may lead to bullying. The social approach theorises bullying as one of many reactions to particular kinds of social insecurity. The concepts I develop include the necessity of belonging, social exclusion anxiety and the production of contempt and dignity by both children and adults. I also draw on Judith Butler’s concept of abjection. In the last part of the article, I employ Karen Barad’s theory of agential realism, focusing specifically on her concept of intra-acting enacting forces. The entry to the theoretical development is based on empirical data generated in Denmark during a comprehensive five-year study of bullying.