Biofilm Formation (IMAGE) Penn State Caption This is a biofilm reactor tube. Researchers evaluated biofilm formation on the plastic composite supports in the bioreactor. They discovered that when mold and yeast are allowed to form a biofilm, hyphae of the mold provide surface area for the yeasts' attachment, improving ethanol production. Credit Dimerci Lab Usage Restrictions Non commercial use only License Licensed 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.