Identification of Fungal Organisms Present in Elements Considered Historical Heritage

In this study, the presence of xylophagous organisms in historical wood present in the temple of Santiago Apostol in Tupátaro, Michoacán, Mexico, was evaluated. Through a visual inspection of three different structural zones in damaged wood of the temple, sampling of various fungal isolates was performed, to be subsequently molecularly identified. Similarly, the temperature and humidity conditions of each site where the samples were taken were recorded, and the laccase and cellulase activities were evaluated for each isolate. The results showed the presence of 14 fungal organisms with well-differentiated morphological characteristics, present in structures such as doors, windows, floors, ceilings, columns, and lintels. Organisms such as Fusarium, Trichoderma, Penicillium, and Aspergillus were found. The temperature and humidity conditions in the temple were found to favor fungal growth in different areas of the structure. The fungi found and identified exhibit enzymatic characteristics to degrade and/or generate aesthetic damage in the colonized wood.

The Identification of Xylophagous Fungi and Evaluation of Mechanical Damage in Preserved Wood

In this study, seven xylophagous fungi (Trametes; Trichoderma A1; Trichoderma A2; Aspergillus; Paecilomyces; Coniochaeta; Gloeophyllum) were exposed to wood preserved with CCA salts, boric acid, and a polyphenolic extract (ExPol). The results showed a prevalence of xylophagous fungi that affects the use of wood. Changes in physical parameters such as mass are accompanied by changes in mechanical properties; variation in weight losses went from 12.69-20.42 %, 6.13-19.70 % and 6.38-23.68% for CCA, H3BO3 and ExPol respectively. In conclusion, variations in response to the preservatives were shown for each microorganism due the fact that metabolism is not the same because they use the substrate components or polymers in different ways for growth, being Expol the best option to inhibit Trametes, Trichoderma A2 and Aspergillus, there’s not much difference between CCA and H3BO3 for the control of the rest of the organisms but both are better alternative than ExPol to inhibit their growth.