Biocidal Effect of Gamma Radiation on the Ecology of Filamentous Fungal Populations Associated with Stone Deterioration
Biocidal Effect of Gamma Radiation on the Ecology of Filamentous Fungal Populations Associated with Stone Deterioration作者机构：Department of Microbiology Institute of Biological Sciences Federal University of Minas Gerais-UFMG Belo Horizonte 31270-901 Brazil Department of Chemistry Institute of Exact Sciences Federal University of Minas Gerais-UFMG Belo Horizonte 31270-901 Brazil Faculty of Engineering and Architecture Foundation of Education and Culture of Minas Gerais-FUMEC University Belo Horizonte 30310-190 Brazil
出 版 物：《Journal of Environmental Science and Engineering(A)》 (环境科学与工程（A）)
年 卷 期：2017年第6卷第5期
页 面：252-259页
学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 09[农学] 0904[农学-植物保护] 090401[农学-植物病理学] 090402[农学-农业昆虫与害虫防治]
主 题：Gamma radiation biocidal stone ecology filamentous fungi.
摘 要：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, Aspergillusfumigatus, 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.
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