Image and Video Gallery

This is a searchable collection of scientific photos, illustrations and videos. Permission is granted to use these products for educational, news media or research purposes, provided the source for each is credited. The material in this collection may not be used to promote or endorse commercial products or services.

Enter text in the box below to search the collection.

From the Collection

Pulsating response to stress in bacteria

By attaching fluorescent proteins to the genetic circuit responsible for B. subtilis's stress response, researchers can observe the cells' pulses as green flashes.

In response to a stressful environment like one lacking food, B. subtilis activates a large set of genes that help it respond to the hardship. Instead of leaving those genes on as previously thought, researchers discovered that the bacteria flip the genes on and off, increasing the frequency of these pulses with increasing stress.

From a November 2011 Caltech news release. See entry 3254 for the related video.