•Human pathogens: Burkholderiacepaciais an opportunistic pathogen causing pneumonia and cystic fibrosis. Neisseria meningitidiscauses fatal inflamationof the membranes lining the brain.
•Bioremediation: Zoogloearamigerain aerobic wastewater treatment (degrades organic carbons in waste stream)
•Ecological importance: Thiobacilluscan oxidise sulfur compounds and fix carbon dioxide. Nitrosomonasand Nitrosospiraare ammonia-oxidisingbacteria