Illustration of soil (IMAGE) Northwestern University Caption Image of soil with a close-up of a bacterium and the cellular pathways involved in carbon dioxide productions. Available substrates from soil organic matter are processed through specific pathways with different amount of carbon dioxide output flux. Credit Aristilde Lab/Northwestern University Usage Restrictions Add credit License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.