pathology : Soil microbiology : Veterinary microbiology :  veterinary medicine taxonomy . Environmental microbiology :  rhizosphere and phyllosphere , soil and groundwater ecosystems , open oceans or extreme environments ( extremophiles ). Microbial ecology Microbially-mediated nutrient cycling Geomicrobiology Microbial diversity Bioremediation Water microbiology (or Aquatic microbiology): Aeromicrobiology (or Air microbiology): Epidemiology