KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY KENNETH EWARD / BIOGRAFX / SCIENCE PHOTO LIBRARY
LIBRARY Biosensor molecule. Computer graphics representation of superoxide dismutase enzyme (white) embedded in a matrix (sphere). The enzyme is acting as a biosensor. Biosensors are used to detect trace amounts of specific chemical substances such as metal ions. In this representation, the yellow spheres are copper ions. They diffuse into the inert matrix and react with the enzyme, causing an observable colour change (to blue).
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