Portable biosensor (IMAGE) University of Copenhagen - Faculty of Science Caption The researchers also developed a portable plastic device with a yeast cell biosensor in it. Plant material, saliva, urine, blood and other material is placed into the gizmo. The device then uses the smartphone’s camera to see if the yeast cells light up, delivering its result in just 15 minutes. Credit Sotirios Kampranis Usage Restrictions None 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.