theme7(4)

• Nitrogen Fixation -

  • N is NB component of DNA and proteins
  • N is inert (doesn’t react easily)
  • Fixation frees N to react and form nitrates/ammonia - NB in agriculture
• Nitrogen cycle

  1. N fixing bacteria -include mechanisms used to protect nitrogenases.
  2. Nitrifying bacteria and archaea -nitrite oxidisers -ammonia oxidisers