115 documents found, page 1 of 12
Prospection of the red biological patinas influencing the urban scenery archite...
Sitzia, F; Lisci, C; Dias, L; Arantes, S; Caldeira, A TeresaPortugal’s architecture reflects a rich history influenced by Roman, Moorish, Neoclassical and Romantic styles, with the 20th century marked by Art Deco and colonial influences. Regional styles vary, with white-painted buildings commonly experiencing color changes due to biofilm formation. Visually striking are the red-colored biological patinascommon in the coastal areas. A survey of 120 historical buildings a...
Microbial induced stone discoloration in alcobaça monastery: A comprehensive study
Silva, I; Dias, L; Salvador, Cátia; Miller, A; Candeias, A; Caldeira, A TeresaThe Alcobaça Monastery (Portugal), a UNESCO World Heritage Site, currently exhibits a high degree of surface alterations of the stone architectural elements inside the church, including an extensive pink coloration in the walls and columns, bacteria biofilms, and salt efflorescences. The main goal was to identify the microbiota that colonizes the walls and columns of this monument, to help custodians and conser...
Dating recent tidal marsh sediments using windborne giant particles of green pe...
Moreno, J; Leorri, E; Fatela, F; Freitas, MC; Moreno, F; Mirão, J; Dias, L; Leira, M; Masqué, P; Russo, A; Cunha, A; Inácio, M; Blake, WHCoastal systems are especially vulnerable to human activities resulting from a range of direct physical modifications of the ecosystems to the biological, chemical, and physical impacts of pollutants. For the most recent decades, these modifications can be accurately tracked by industrial development indicators, providing an exceptional record of historical changes. In return, when such changes are identified i...
Assessing aesthetic and structural deterioration in historic buildings – a cont...
Dias, L; Rosado, T; Bhattacharya, S; Candeias, A; Caldeira, A T; Mirão, JAn important part of our cultural heritage assets is built of natural stone since it has always been a material of excellence due to its inherent characteristics. Despite the physical and mechanical properties that give relatively long durability as a construction material, some characteristics are less durable, namely color or eventual surface finishes. The alteration of its aesthetic features may be followed ...
Provenance study of the limestone used in the construction and restoration of t...
Ding, Y; Mirão, J; Redol, P; Dias, L; Moita, P; Angelini, E; Grassini, S; Schiavon, NTo assess the provenance of the limestones used in the construction and restoration of the Batalha Monastery in central Portugal, stone samples collected from the monument and from five limestone quarries in the region surrounding the building were investigated by energy-dispersive X-ray fluorescence spectroscopy (ED-XRF), powder X-ray diffractometry (PXRD) and thermogravimetric analysis (TGA). Ca-Sr binary dia...
Value of simple otoscopy in diagnosing otitis media with effusion in children
Azevedo, C; Firmino Machado, J; Fontes Lima, A; Milhazes Mar, F; Vilarinho, S; Dias, LAims To explore the value of otoscopy in diagnosing OME when performed by otorhinolaryngology, pediatrics, and primary care physicians; to evaluate the interobserver and intraobserver agreement of interpretation of otoscopy images. Material and methods A cross-sectional study using an anonymous mailed survey was used. We presented pre-recorded otoscopy images of pediatric patients to otorhinolaryngology, pediat...
Assessment of microbiota present on a Portuguese historical stone convent using...
Rosado, T; Dias, L; Lança, M; Nogueira, C; Santos, R; Candeias, A; Mirão, J; Caldeira, A TThe study performed on the stone materials from the Convent of Christ revealed the presence of a complex microbial ecosystem, emphasizing the determinant role of microorganisms on the biodecay of this built cultural heritage. In this case study, the presence of Rubrobacter sp., Arthrobacter sp., Roseomonas sp., and Marinobacter sp. seems to be responsible for colored stains and biofilm formation while Ulocladiu...
Linking ornamental stone discolouration to its biocolonisation state
Dias, L; Rosado, T; Candeias, A; Mirão, J; Caldeira, A TeresaColour in historic and modern architecture is one of the most important visible characteristics that should be preserved along the times. There are many factors that can induce stone weathering, promoting its discolouration. Among these factors, microorganisms’ action was neglected for many decades, and nowadays there is a lack of association in the relation of stone alteration and biogenic activity. This work ...
A change in composition, a change in colour: The case of limestone sculptures f...
Dias, L; Rosado, T; Candeias, A; Mirão, J; Caldeira, A TeresaTo keep the integrity of our common cultural heritage there is a growing need to understand its deterioration mechanisms, so that aesthetical and structural alterations can be predicted and prevented. This work comprises an important contribution to understand the deterioration mechanisms of four limestone sculptures, stored in an indoor museum environment, which is not necessarily an innocuous environment. The...
A change in composition, a change in colour: The case of limestone sculptures f...
Dias, L; Rosado, T; Candeias, A; Mirão, J; Caldeira, A TeresaTo keep the integrity of our common cultural heritage there is a growing need to understand its deterioration mechanisms, so that aesthetical and structural alterations can be predicted and prevented. This work comprises an important contribution to understand the deterioration mechanisms of four limestone sculptures, stored in an indoor museum environment, which is not necessarily an innocuous environment. The...