Denitrification - Denitrification.; (nitrousoxide)orgaseousnitrogen(N2.Anaerobic

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Denitrification . Denitrification is the opposite of nitrogen fixing and nitrification; denitrifying bacteria  return nitrogen to the atmosphere as N 2 O (nitrous oxide) or gaseous nitrogen (N 2 ). Anaerobic  bacteria carry out denitrification when oxygen diffuses too slowly through the soil to meet the  microbial respiration demand. Nitrate replaces oxygen as the needed electron acceptor in these  instances.  Extreme environments The  Archaea  are divided into three large groups based on their physiological diversity. The  methanogens  are strict anaerobes that produce methane (CH 4 ),  halophiles  are  chemoorganotrophs that  require  12–23 percent salt to grow, and one group of  thermophiles  grows  best at temperatures over 80°C, the other group at 0°C and lower.  Pyrolobus  grows at 113°C, the  hottest known temperature to maintain an organism;  Thermoplasma  species combine low acidity and 
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 11/14/2011 for the course BIO 1421 taught by Professor Farr during the Fall '08 term at Texas State.

Ask a homework question - tutors are online