Growth Yields in Bacterial Denitrification and Nitrate Ammonification

• DOI: 10.1128/aem.02508-06
• Publication Date: 2007-01-06T01:34:25Z
• Authors: Tobin O. Strohm; Ben Griffin; Walter G. Zumft; Bernhard Schink
• Keywords: Pseudomonas stutzeri; Aerobic denitrification; Paracoccus denitrificans; Nitrogen Cycle

ABSTRACT Denitrification and nitrate ammonification are considered the highest-energy-yielding respiration systems in anoxic environments after oxygen has been consumed. The corresponding free energy changes 7 35% lower than that of aerobic respiration, respectively. Growth yield determinations with pure cultures Paracoccus denitrificans Pseudomonas stutzeri revealed far less is converted via ATP into cell mass expected from above calculations. formate or hydrogen as electron donor yielded about 2.4 to 3.0 g dry matter per mol 15 18 acetate. Similar yields acetate were obtained stutzeri. Wolinella succinogenes Sulfurospirillum deleyianum , which reduce ammonia, both exhibited similar values H 2 plus nitrate. results indicate synthesis denitrification even ammonification. discussed against background our present understanding flow respect importance environment.