〔報告〕キトラ古墳から分離された細菌や酵母の修復用高分子材料に対する資化性試験

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Microbial contamination on condsolidants of mural paintings is a serious problem. Growth tests of fungal strains isolated from Takamatsuzuka and Kitora Tumuli on resins used for consolidation of mural paintings have been performed before, spraying fungal spores on pure layers of such resins. But growth tests with bacterial or yeast strains could not be designed in the same way as they usually need higher water content. This time, growth of such bacterial and yeast strains was investigated in minimal liquid media which contain each of the consolidants as a major carbon source. As a result, some bacterial strains such as Sphingobium sp., Rhizobium sp., Microbacterium sp., Bacillus thuringiensis, and Stenotrophomonas sp. isolated from Kitora Tumulus and Pseudomonas aeruginosa as a control strain, were able to grow in mediacontaining HPC (hydroxyl propyl cellulose) or MC (methyl cellolose) as a major carbon source. But Gluconacetobacter sp., which was thought to have been involved in severe plaster deterioration in Kitora Tumlus,could not grow in media containing HPC or MC as a single carbon source. Most of the yeast strains tested were not able to grow in media with HPC or MC, either. All the tested microbial species, on the other hand, could grow well in media containing animal glue or funori.

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