Detection and Elimination of Cyanobacteria from Frescoes : The Case of the St. Brizio Chapel (Orvieto Cathedral, Italy)
Articolo
Data di Pubblicazione:
2009
Citazione:
Detection and Elimination of Cyanobacteria from Frescoes : The Case of the St. Brizio Chapel (Orvieto Cathedral, Italy) / F. Cappitelli, P. Abbruscato, P. Foladori,
E. Zanardini, G. Ranalli, P. Principi, F. Villa, A. Polo, C. Sorlini. - In: MICROBIAL ECOLOGY. - ISSN 0095-3628. - 57:4(2009 Jul 22), pp. 633-639.
Abstract:
A rosy discoloration partly masking the Luca
Signorelli frescoes in St. Brizio Chapel (Orvieto Cathedral, Italy) for many years proved to be a biological alteration, so
the present research focused on investigating biodeteriogens
and selecting an appropriate biocide to treat them.
Optical epifluorescence and electronic microscopic observations of the rosy powder revealed a prevalent autofluorescent
coccoid form with a diameter bigger than 5 μm.
Chlorophylls a and b were extracted, suggesting the presence of cyanobacteria, a thesis subsequently confirmed
by flow cytometry. Cultural media were inoculated with the rosy powder, and microorganisms grew as a green patina in phototrophic conditions and as a rosy patina when organic compounds were added to the mineral medium. The rosy discoloration was most likely caused by the presence
of phycoerythrin. The sequencing of the cyanobacteriaspecific polymerase chain reaction (PCR)–DGGE bands matched, with a similarity percentage >94, uncultured
cyanobacteria, and the sequences were deposited in the GenBank under EU874241, EU874242, EU874243, EU874244, EU874245, EU874246, and EU874247. Finally,
the efficiency of the two biocides Neo Desogen and Metatin 5810-101, both based on benzalkonium chloride, was evaluated using adenosine triphosphate measurements
and PCR-based detection of cyanobacteria. Metatin, used in situ at 2% of the trade product, proved to be the better biocide, no cyanobacteria being detected after the Metatin treatment.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
RIBOSOMAL-RNA GENES ; MICROORGANISMS ; LIGHT ; ART ; PCR
Elenco autori:
F. Cappitelli, P. Abbruscato, P. Foladori,
E. Zanardini, G. Ranalli, P. Principi, F. Villa, A. Polo, C. Sorlini
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