Biodeterioration of ancient stone materials from the Persepolis monuments (Iran) |
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Authors: | Parisa Mohammadi Wolfgang E Krumbein |
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Institution: | (1) Geomicrobiology, ICBM, Carl von Ozzietsky St., No. 9–11, 26129 Oldenburg, Germany |
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Abstract: | The problem of deterioration of art works is particularly relevant in countries like Iran that are rich in cultural heritage.
According to UNESCO data, Iran holds the tenth rank in a list of countries possessing the highest number of monuments belonging
to the world cultural heritage. Archaeological areas, buildings, mosques, statues, museums and objects are all exposed to
different biogenic and abiogenic stresses under generally aggressive climatic conditions. Lichens and fungi are known to actively
decompose stone surfaces. This process is both physical and chemical in nature and often reaches deep below the stone surfaces.
This is caused by chemical and physical interactions of the microbiota with the fluctuating and often drastically changing
environmental conditions. Here, we describe and analyze the mainly physical degradation by invading fungal hyphae between
stone crystals and a generally destabilizing stone texture. In addition to physical deterioration, organic acids produced
by lichens enhance the chemical decomposing processes. In this work, penetration of hyphal bundles as well as individual fungi
was studied, and the biodeteriorating patterns were documented and compared to general physical–chemical weathering phenomena.
Several strains of aggressive black yeast-like fungi and bacteria were isolated and cultivated and will be described in a
taxonomical context with many other isolates from different localities using physiological, morphological and molecular data. |
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Keywords: | Biodeterioration Biopitting Persepolis |
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