Jroundi Fadwa, Schiro Mara, Ruiz-Agudo Encarnación, Elert Kerstin, Martín-Sánchez Inés, González-Muñoz María Teresa, Rodriguez-Navarro Carlos
Department of Microbiology, Faculty of Science, University of Granada, Avda. Fuentenueva s/n, 18071, Granada, Spain.
Department of Mineralogy and Petrology, Faculty of Science, University of Granada, Avda. Fuentenueva s/n, 18071, Granada, Spain.
Nat Commun. 2017 Aug 17;8(1):279. doi: 10.1038/s41467-017-00372-3.
Enhanced salt weathering resulting from global warming and increasing environmental pollution is endangering the survival of stone monuments and artworks. To mitigate the effects of these deleterious processes, numerous conservation treatments have been applied that, however, show limited efficacy. Here we present a novel, environmentally friendly, bacterial self-inoculation approach for the conservation of stone, based on the isolation of an indigenous community of carbonatogenic bacteria from salt damaged stone, followed by their culture and re-application back onto the same stone. This method results in an effective consolidation and protection due to the formation of an abundant and exceptionally strong hybrid cement consisting of nanostructured bacterial CaCO and bacterially derived organics, and the passivating effect of bacterial exopolymeric substances (EPS) covering the substrate. The fact that the isolated and identified bacterial community is common to many stone artworks may enable worldwide application of this novel conservation methodology.Salt weathering enhanced by global warming and environmental pollution is increasingly threatening stone monuments and artworks. Here, the authors present a bacterial self-inoculation approach with indigenous carbonatogenic bacteria and find that this technique consolidates and protects salt damaged stone.
全球变暖和环境污染加剧导致的盐风化正危及石碑和艺术品的存续。为减轻这些有害过程的影响，人们采用了多种保护处理方法，但效果有限。在此，我们提出一种新颖、环保的细菌自我接种方法来保护石材，该方法基于从受盐侵蚀的石材中分离出一个产碳酸盐细菌的本地群落，随后对其进行培养并重新应用于同一块石材上。由于形成了由纳米结构的细菌碳酸钙和细菌衍生有机物组成的丰富且异常坚固的混合水泥，以及覆盖在基材上的细菌胞外聚合物（EPS）的钝化作用，这种方法能实现有效的加固和保护。所分离和鉴定出的细菌群落存在于许多石雕艺术品中，这一事实可能使这种新颖的保护方法得以在全球范围内应用。全球变暖和环境污染加剧导致的盐风化对石碑和艺术品的威胁日益增大。在此，作者提出一种利用本地产碳酸盐细菌的细菌自我接种方法，并发现该技术能加固和保护受盐侵蚀的石材。
