New insights on nitrogen transformation and attack on world stone monuments

Area of Science:

• Microbiology
• Environmental Science
• Cultural Heritage Preservation

Background:

• Nitrogen (N)-transferring microorganisms are increasingly recognized for their role in the biodeterioration of cultural heritage sites.
• Ammonia-oxidizing microorganisms (AOM) and related bacteria are significant contributors to stone decay.
• Previous research has not fully elucidated the ecological diversity and specific mechanisms of these microbes on stone monuments.

Purpose of the Study:

• To investigate the ecological diversity of nitrogen-transferring microorganisms, particularly ammonia-oxidizing bacteria, on stone monuments.
• To understand the acid production capabilities and biodeterioration mechanisms of these newly detected microbial communities.
• To establish a novel research framework for the study and management of biodeterioration affecting world cultural heritage.

Main Methods:

• Field sampling from various stone monuments exhibiting signs of decay.
• Molecular techniques (e.g., 16S rRNA gene sequencing) for microbial community analysis.
• Laboratory experiments to assess acid production and metabolic activity under simulated environmental conditions.

Main Results:

• Identification of diverse ammonia-oxidizing and related nitrogen-cycling microorganisms on stone surfaces.
• Demonstration of significant acid production by these microbial communities, directly contributing to stone weathering.
• Elucidation of specific biodeterioration pathways linked to microbial metabolic processes.

Conclusions:

• Newly detected nitrogen-transferring microorganisms play a critical role in the accelerated biodegradation of stone cultural heritage.
• The ecological diversity and acid-producing capabilities of these microbes necessitate targeted conservation strategies.
• This research provides a foundational framework for future studies on microbial biodeterioration and effective heritage management.