1. Ammonia oxidizing bacteria: a model for molecular microbial ecology 2. The lithoautotrophic ammonia oxidizing bacteria 3. Diversity of ammonia oxidizing bacteria 4. Abundance of ammonia oxidizing bacteria in industrial wastewater treatment systems 5. Population ecology of nitrifying bacteria in wastewater treatment systems. 6. Ammonia oxidation kinetics & its application in wastewater treatment. 7. Autotrophic nitrification in bacteria 8. Ecology, Diversity and Functions of Anammox process in Modified Ludzack Ettinger Process (MLE) 9. Ammonia oxidizing bacterial community analysis in activated sludge process 10. Growth, activity and temperature responses of ammonia-oxidizing archaea and bacteria in soil microcosms. 11. Aerobic and anaerobic ammonia oxidizing bacteria. 12. Genomics of ammonia oxidizing bacteria and denitrification in wastewater treatment plants. 13. Nitrification by chemolithotrophic bacteria. 14. Ammonium removal by the oxygen limited autotrophic nitrification denitrification system. 15. An overview of the Anammox process. 16. Key physiology of anaerobic ammonium oxidation. 17. Completely autotrophic nitrogen removal over nitrite under ammonia limitation 18. Diversity study of nitrifying bacteria in sewage and industrial wastewater treatment plant