42 documents found, page 1 of 5

Miniaturized Solid Phase Extraction Techniques Applied to Natural products: A r...

Assessing aesthetic and structural deterioration in historic buildings – a cont...

An 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 ...

Microextraction by Packed Sorbent as a Clean-up Approach for the Determination ...

The use of new psychoactive substances has been increasing and constitutes a social and public health problem, and hence, toxicological analysis has become of utmost importance for the detection of such substances. In this article, we present the development and full validation of a simple, user and environmentally friendly, cheap and suitable method for the determination of ketamine and its main metabolite nor...

Green Bioactive Compounds: Mitigation Strategies for Cultural Heritage

This work combines the potential of these two natural sources of green active compounds and intends to develop a natural green alternative to chemical biocides, thus contributing to a sustainable and environmentally safe conservationrestoration process for built cultural heritage.

On the biodiversity and biodeteriogenic activity of microbial communities prese...

Hypogenic caves represent unique environments for the development of specific microbial communities that need to be studied. Caves with rock art pose an additional challenge due to the fragility of the paintings and engravings and to microbial colonization which may induce chemical, mechanical and aesthetic alterations. Therefore, it is essential to understand the communities that thrive in these environments a...

A change in composition, a change in colour: The case of limestone sculptures f...

To 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...

MITIGATION APPROACH TO AVOID FUNGAL COLONISATION OF POROUS LIMESTONE

This work highlights the importance and eficacy of BEVOTECH solutions to inhibit fungal development on rock surfaces. These natural, ecofriendly and safe biocompounds can overcome the biodecay processes, constituting an alternative and innovative solution for rock materials preservation. The three BEVOTECH biocompounds promoted efficient inhibition levels for Aspergillus, Penicillium, Cladosporium and Acremoniu...

Understanding the influence of microbial contamination on colour alteration of ...

This article reports biocolonization assays carried out on yellow and red ochres and ultramarine blue pigments. These pigments have been most commonly used in traditional limewash of heritage buildings from southern Portugal (Alentejo) and, in the case of the yellow and red ochres, also in historical decorative wall paintings since Roman times. The research aim was to assess the potential role played by microor...

Assessment of microbiota present on a Portuguese historical stone convent using...

The 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

Colour 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 ...