Biosensor Chip (image) Princeton University, Engineering School Caption An electronic chip developed by the Princeton engineers is coated with antimicrobial peptides from the skin of an African frog. When the peptides come in contact with bacterial contaminates the chip generates an electric signal as a warning. Credit Photo: Frank Wojciechowski Usage Restrictions None 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.