Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Bacteria cause old buildings to feel off color

28.10.2008
Researchers isolate five new Rubrobacter strains that cause biodeterioration

The assumption that time, weather, and pollution are what cause buildings to decline is only partly true.

Bacteria are also responsible for the ageing of buildings and monuments - a process known as biodeterioration, where organisms change the properties of materials through their vital activities. Leonila Laiz from the Institute for Natural Resources and Agrobiology in Seville, Spain, and colleagues have just isolated five new strains of bacteria that degrade old buildings.Their work1 is published online this week in Springer's journal Naturwissenschaften.

Over the last decade, both microbiologists and conservators have been studying the microbial colonization and biodeterioration of both mural paintings in ancient monuments and plaster walls in churches. A specific family of bacteria, Rubrobacter, is commonly found in aged monuments and is thought to be responsible for their rosy discoloration. Until now, only three Rubrobacter species have been identified, and they all thrive in high temperatures of 45 to 80 degrees Celsius (thermophilic bacteria).

Laiz and her team studied three indoor sites showing overt biodeterioration: the Servilia and Postumio tombs in the Roman Necropolis of Carmona in Spain and the Vilar de Frades church in Portugal. Their microbiological and molecular analyses identified five new Rubrobacter strains. The strains are partly involved in the process of efflorescence formation, where salt residues form on buildings, due to the loss of water after exposure to air for a prolonged period of time. Efflorescences lead to damage in the porous structure of the rocks and the gradual deterioration of these buildings.

Two of the newly isolated strains were then grown onto rocks to replicate the biodeterioration process in the laboratory. The Rubrobacter cells penetrated the mineral matrix and crystals formed in contact with the bacterial film. When the film separated from the rock surface after exposure to heat, it removed mineral grains, producing a mechanical deterioration. These three processes are characteristic of biodeterioration and confirm that the isolated bacteria are actively involved in the ageing of the studied buildings.

This study of new Rubrobacter that thrive at lower temperatures (non-thermophilic bacteria) gives another insight into the physiology and activity of these bacteria present in monuments.

Reference
1.Laiz L et al (2008). Isolation of five Rubrobacter strains from biodeteriorated monuments. Naturwissenschaften DOI 10.1007/s00114-008-0452-2

Joan Robinson | alfa
Further information:
http://www.springer.com

More articles from Life Sciences:

nachricht Fingerprint' technique spots frog populations at risk from pollution
27.03.2017 | Lancaster University

nachricht Parallel computation provides deeper insight into brain function
27.03.2017 | Okinawa Institute of Science and Technology (OIST) Graduate University

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Giant Magnetic Fields in the Universe

Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.

The results will be published on March 22 in the journal „Astronomy & Astrophysics“.

Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...

Im Focus: Tracing down linear ubiquitination

Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.

Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...

Im Focus: Perovskite edges can be tuned for optoelectronic performance

Layered 2D material improves efficiency for solar cells and LEDs

In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...

Im Focus: Polymer-coated silicon nanosheets as alternative to graphene: A perfect team for nanoelectronics

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.

Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...

Im Focus: Researchers Imitate Molecular Crowding in Cells

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.

Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

International Land Use Symposium ILUS 2017: Call for Abstracts and Registration open

20.03.2017 | Event News

CONNECT 2017: International congress on connective tissue

14.03.2017 | Event News

ICTM Conference: Turbine Construction between Big Data and Additive Manufacturing

07.03.2017 | Event News

 
Latest News

Northern oceans pumped CO2 into the atmosphere

27.03.2017 | Earth Sciences

Fingerprint' technique spots frog populations at risk from pollution

27.03.2017 | Life Sciences

Big data approach to predict protein structure

27.03.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>