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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Douglas Boniek1, Isolda de Castro Mendes2, Antônio Fernando Batista dos Santos3 and Maria Aparecida de Resende Stoianoff1
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DOI:10.17265/2162-5298/2017.05.005
Affiliation(s)
1. Department of Microbiology, Institute of Biological Sciences, Federal University of Minas Gerais−UFMG, Belo Horizonte 31270-901, Brazil
2. Department of Chemistry, Institute of Exact Sciences, Federal University of Minas Gerais−UFMG, Belo Horizonte 31270-901, Brazil
3. Faculty of Engineering and Architecture, Foundation of Education and Culture of Minas Gerais−FUMEC University, Belo Horizonte 30310-190, Brazil
ABSTRACT
This study focused on the
identification of the filamentous fungi associated with soapstone samples
exposed to outdoor conditions and the biocidal effect of gamma radiations on
isolated fungal populations in Minas Gerais State in Brazil. Two soapstone blocks were placed
outdoors under tropical environmental conditions for 12 months. A total of 9
filamentous fungal populations were identified on their surfaces, namely Acremomium (cf.) alternatum, Alternaria alternata, Aspergillus fumigatus, Calcarisporium (cf.) arbuscula, Cladosporium cladosporioides, Curvularia lunata, Epicoccum nigrum, Fusarium equiseti and Penicillium citrinum. The gamma radiation assay was then carried out as a
test of biocidal action by exposing all fungal populations to the ionizing
radiation. The results showed that only the C.
cladosporioides species was resistant to this biocidal agent, since it was
able to increase its population post exposure. Scanning electron microscopy
images identified the microbial colonization on the soapstone blocks and the
stone elementar composition was analyzed by energy dispersive X-ray spectrometry.
After treatment, there was no structural and aesthetic alteration in the
soapstone samples, and evidencing that gamma radiation can be used as a
biocidal agent. However, the resistance of the black fungal population
indicates caution in the choice of gamma irradiation as biocidal treatment.
KEYWORDS
Gamma radiation, biocidal, stone, ecology, filamentous fungi.
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