The degradation properties of calcium carbonate-based materials in which organisms get epiphytic and the development of the diagnostic procedures

本研究以国内外微生物为研究对象，对使用碳酸钙基材料的文化资产附生生物的影响进行了调查。除了现场观察外，我们还调查了附着在基质材料上的微生物的密度和渗透深度，并对反应产物和DNA进行了分析，从而明确了附生微生物在石膏中的渗透深度。此外，有人提出，在地衣密度高的地区，石膏的状态可能已经改变。确认了化学降解的产品材料。我们基于暴露试验评估了微生物的黏附过程。结果，观察到微生物沿着石膏中的有机纤维进入石膏内部。我们证实了化学处理对防止微生物入侵的有效性。

In this study, focusing on microorganisms at home and abroad, we conducted a survey regarding the impact of epiphytic organisms adhering to cultural assets where calcium carbonate-based materials were used. In addition to on-site observations, we also investigated the density and penetrating depth of organisms that adhered to the substrata materials, along with analysis of reaction products and DNA.Hence, we clarified the penetrating depth of the epiphytic organisms in the plaster. In addition, it was suggested that, in areas with a high density of lichen, there is a possibility the state of the plaster might have been changed. Chemically degraded product materials were confirmed.We assessed the adhesion process of microorganisms based on an exposure test. As a result, it was observed that microorganisms have entered inside of the plaster along organic fibers in the plaster. We confirmed the effectiveness of chemical treatment to prevent microbial invasion.