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The latest in the Artefacts series, Behind the Exhibit examines scientific heritage and narratives behind public display of scientific artifacts in national and international exhibitions and science museums throughout the twentieth century. Developed from the Artefacts XX conference, convened 20–22 September 2015 at the Leonardo da Vinci National Museum of Science and Technology in Milan, during Expo Milan 2015, this volume brings together museum curators and historians of science and technology to present case studies from the United States, Europe, Russia, and Japan. What emerged is a study of the tension between basic science and technological applications, the multilayered role of history, the appearance and disappearance of artifacts, and the search for a balance between entertainment and education.

The Museo Nazionale della Scienza e della Tecnologia “Leonardo da Vinci” in Milan is exposing two pairs of canal lock gates, used to control the water flow in Milan canal system, whose design appears in the Leonardo’s Codex Atlanticus. The wood present in the gates has been deeply characterised by mean of a multidisciplinary investigation involving i) DNA barcoding of wood fragments; ii) microbial community characterisation, and iii) chemical analyses. DNA barcoding revealed that two fragments of the gates belonged to wood species widely used in the middle age: Fagus sylvatica and Picea abies. The chemical characterisations were based on the use of ionic liquid as dissolving medium in order to analyse the entire cell wall material by means of Gel Permeation Chromatography (GPC) and 2D-NMR-HSQC techniques. This multidisciplinary analytical approach was able to highlight the complex nature of the degradation occurred during the gate operation (XVI-XVIII centuries): an intricate interplay between microbial populations (i.e. Shewanella), inorganic factors (i.e. iron from nails), physical factors and the lignocellulosic material.

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