Image Number K7452-5

Infrared video thermography showed that a drop of pure (deionized) water placed on the right lobe of this bean leaf froze more than 2 minutes later than the leaf. A droplet of ice-nucleating bacteria put on the left lobe was the first to freeze, inducing ice nucleation throughout the leaf.

Photo by Keith Weller

640 pixels wide: (k7552-5.jpg)