Concentration of Quantum Dots (IMAGE) University of California - Santa Barbara Caption The concentration of quantum dots (black bars), as measured by cadmium, increased from bacterial prey into the protozoan predator -- an outcome called biomagnification. Credit UCSB Usage Restrictions None 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.