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Ammonia-oxidizing bacteria: a model for molecular microbial ecology
1Netherlands Institute of Ecology, Centre for Terrestrial Ecology, Boterhoeksestraat 48, P.O. Box 40, Heteren, 6666 ZG, The Netherlands. gkowal@cto.nioo.knaw.nl
Annual Review of Microbiology
|September 7, 2001
Summary
Chemolitho-autotrophic ammonia-oxidizing bacteria are crucial for nitrogen cycling, driving the rate-limiting step of nitrification. Research is rapidly advancing our understanding of these vital microbes and their ecological roles.
Area of Science:
- Environmental Microbiology
- Biogeochemical Cycles
- Proteobacteria Ecology
Background:
- Eutrophication drives interest in nitrogen transformation processes.
- Ammonia-oxidizing bacteria (AOB) perform the critical, rate-limiting step of nitrification.
- These bacteria are chemolitho-autotrophs, using ammonia oxidation for energy.
Purpose of the Study:
- To review recent advancements in the ecology and physiology of ammonia-oxidizing bacteria.
- To highlight the importance of AOB in global nitrogen cycling.
- To focus on the beta-subclass Proteobacteria as a model system.
Main Methods:
- Molecular biological approaches have facilitated ecological studies.
- Investigating the distribution and diversity of AOB.
- Analyzing the physiology of these unique microorganisms.
Main Results:
- Significant progress has been made in understanding AOB ecology.
- The monophyletic nature of terrestrial AOB aids molecular studies.
- Beta-Proteobacteria AOB are well-studied model organisms.
Conclusions:
- Ammonia-oxidizing bacteria are key players in nitrogen cycling.
- Understanding AOB is vital for managing eutrophication.
- Molecular ecology has greatly advanced AOB research.