The Experts below are selected from a list of 321 Experts worldwide ranked by ideXlab platform
Didier Brissaud - One of the best experts on this subject based on the ideXlab platform.
-
The pink staircase of Sully-sur-Loire castle: Even bacteria like historic Stonework
International Biodeterioration and Biodegradation, 2019Co-Authors: Johann Leplat, Faisl Bousta, Alexandre François, Mikael Guiavarc'h, Jean-didier Mertz, Didier BrissaudAbstract:Rosy discoloration has affected the stone steps in the main spiral staircase of the Sully-sur-Loire castle donjon for many years now. This study monitors the development of the coloration and the environmental climatic conditions in the staircase to understand the conditions favoring the presence of this rosy discoloration. High-throughput sequencing was performed on healthy stone and on pink pigmented stone to identify the agent responsible for this discoloration. The results suggest that the rosy discoloration is the mark of a former degradation process which is now inactive, and that bacteria were the main agent of the pink patina formation. Nitiliruptor was the main genus identified in the pink parts of the staircase. This is the first time that this bacterial genus has been linked to a cultural heritage biodeterioration process. There was no evidence that this bacterial genus was responsible for the development of the pink patina, but it could have replaced it as a subsequent evolution of the process.
Johann Leplat - One of the best experts on this subject based on the ideXlab platform.
-
The pink staircase of Sully-sur-Loire castle: Even bacteria like historic Stonework
International Biodeterioration and Biodegradation, 2019Co-Authors: Johann Leplat, Faisl Bousta, Alexandre François, Mikael Guiavarc'h, Jean-didier Mertz, Didier BrissaudAbstract:Rosy discoloration has affected the stone steps in the main spiral staircase of the Sully-sur-Loire castle donjon for many years now. This study monitors the development of the coloration and the environmental climatic conditions in the staircase to understand the conditions favoring the presence of this rosy discoloration. High-throughput sequencing was performed on healthy stone and on pink pigmented stone to identify the agent responsible for this discoloration. The results suggest that the rosy discoloration is the mark of a former degradation process which is now inactive, and that bacteria were the main agent of the pink patina formation. Nitiliruptor was the main genus identified in the pink parts of the staircase. This is the first time that this bacterial genus has been linked to a cultural heritage biodeterioration process. There was no evidence that this bacterial genus was responsible for the development of the pink patina, but it could have replaced it as a subsequent evolution of the process.
Donald B. Dingwell - One of the best experts on this subject based on the ideXlab platform.
-
Local geology controlled the feasibility of vitrifying Iron Age buildings
Scientific Reports, 2017Co-Authors: Fabian Wadsworth, Michael Heap, David Damby, Kai-uwe Hess, Jens Najorka, Jérémie Vasseur, Dominik Fahrner, Donald B. DingwellAbstract:During European prehistory, hilltop enclosures made from polydisperse particle-and-block stone walling were exposed to temperatures sufficient to partially melt the constituent Stonework, leading to the preservation of glassy walls called ‘vitrified forts’. During vitrification, the granular wall rocks partially melt, sinter viscously and densify, reducing inter-particle porosity. This process is strongly dependent on the solidus temperature, the particle sizes, the temperature-dependence of the viscosity of the evolving liquid phase, as well as the distribution and longevity of heat. Examination of the sintering behaviour of 45 European examples reveals that it is the raw building material that governs the vitrification efficiency. As Iron Age forts were commonly constructed from local stone, we conclude that local geology directly influenced the degree to which buildings were vitrified in the Iron Age. Additionally, we find that vitrification is accompanied by a bulk material strengthening of the aggregates of small sizes, and a partial weakening of larger blocks. We discuss these findings in the context of the debate surrounding the motive of the wall-builders. We conclude that if wall stability by bulk strengthening was the desired effect, then vitrification represents an Iron Age technology that failed to be effective in regions of refractory local geology.
Mikael Guiavarc'h - One of the best experts on this subject based on the ideXlab platform.
-
The pink staircase of Sully-sur-Loire castle: Even bacteria like historic Stonework
International Biodeterioration and Biodegradation, 2019Co-Authors: Johann Leplat, Faisl Bousta, Alexandre François, Mikael Guiavarc'h, Jean-didier Mertz, Didier BrissaudAbstract:Rosy discoloration has affected the stone steps in the main spiral staircase of the Sully-sur-Loire castle donjon for many years now. This study monitors the development of the coloration and the environmental climatic conditions in the staircase to understand the conditions favoring the presence of this rosy discoloration. High-throughput sequencing was performed on healthy stone and on pink pigmented stone to identify the agent responsible for this discoloration. The results suggest that the rosy discoloration is the mark of a former degradation process which is now inactive, and that bacteria were the main agent of the pink patina formation. Nitiliruptor was the main genus identified in the pink parts of the staircase. This is the first time that this bacterial genus has been linked to a cultural heritage biodeterioration process. There was no evidence that this bacterial genus was responsible for the development of the pink patina, but it could have replaced it as a subsequent evolution of the process.
Alexandre François - One of the best experts on this subject based on the ideXlab platform.
-
The pink staircase of Sully-sur-Loire castle: Even bacteria like historic Stonework
International Biodeterioration and Biodegradation, 2019Co-Authors: Johann Leplat, Faisl Bousta, Alexandre François, Mikael Guiavarc'h, Jean-didier Mertz, Didier BrissaudAbstract:Rosy discoloration has affected the stone steps in the main spiral staircase of the Sully-sur-Loire castle donjon for many years now. This study monitors the development of the coloration and the environmental climatic conditions in the staircase to understand the conditions favoring the presence of this rosy discoloration. High-throughput sequencing was performed on healthy stone and on pink pigmented stone to identify the agent responsible for this discoloration. The results suggest that the rosy discoloration is the mark of a former degradation process which is now inactive, and that bacteria were the main agent of the pink patina formation. Nitiliruptor was the main genus identified in the pink parts of the staircase. This is the first time that this bacterial genus has been linked to a cultural heritage biodeterioration process. There was no evidence that this bacterial genus was responsible for the development of the pink patina, but it could have replaced it as a subsequent evolution of the process.