Z. mobilis degrades sugars to pyruvate using the Entner-Doudoroff pathway. The pyruvate is then fermentated to produce ethanol and carbon dioxide as the only products (analogous to yeast)." - isn't it that Z. mobilis does not produce gases during its fermentation? The Entner-Doudoroff pathway does not liberate CO2 but I may be missing something of the whole picture... Rsreston