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    A Comparative study on the activity of oxygenic photosynthetic consortia on marble and granite
    (INT ASSOC COMPUTER SCIENCE & INFORMATION TECHNOLOGY PRESS-IACSIT PRESS, 2011) Karaca, Zeki; Ozturk, Ayten; Unsal, Tuba; Dan, Y
    This Many kinds of microorganisms are playing key role in degradation of historical artifacts, buildings and monuments made of marble, granite and other dimension stones. It is well known that, photoautotrophic microorganisms predispose the stone surface as a breeding-ground for other group of microorganisms. However, the effects of photoautotrophic and other microorganisms on stone materials, where hygiene is crucial, are not well known. Until now, the relation between microorganisms and rock properties and its effect on usage is not investigated. In this study; the biological weathering of AW (true marble) and BP (granite) has been investigated in laboratory condition. Both stone surfaces also supported a heavy colonization of phototrophic microbial consortia (outer and inner part, respectively). After phototrophic microbial growth on AW and BP, while AW turned to yellowish green from original white color, BP turned to green from original grey color. Inner sides of stones, filamentous biota, are possible member of cyanobacteria, were dominant. However, small spherical aggregates, possible calcified globular bodies on the stones were detected with SEM studies.
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    The Activity of Oxygenic Photosynthetic Microbial Consortia on Different Granites
    (FOUNDATION ENVIRONMENTAL PROTECTION & RESEARCH-FEPR, 2014) Ozturk, Ayten; Karaca, Zeki; Unsal, Tuba
    Deterioration of stone is a combined process caused by physical, chemical and biological factors especially, microbial growth. Various microorganisms are playing a key role in the weathering of historical artifacts, buildings, and monuments made of granite, marble, and other dimension stones. In this study, the biodeterioration of three types granite, Blue Pearl from Norway, Pergamon Grey from Turkey, and Rosa Porrino from Spain were studied for thirty days under laboratory conditions. The results showed that two of the granite surfaces, Pergamon Grey and Rosa Porrino, supported a heavy colonization of phototrophic microbial consortia. These results also showed that filamentous phototrophic microorganisms were dominant on the surfaces of the granites and indicated that the porosity, the availability of water and chemical composition of the granite have encouraged colonization and caused modification on the surfaces. The filamentous aggregates, possibly calcified fibrillar bodies in the inner parts of granites were also detected by SEM studies.