Scientist from the university of pennsylvania researched about 2 molecules ( porphyrins and polymersomes) being used as a stress sensor.
This work's packing the porphyrins in a polymersome membrane that can modulate the light emission of the molecules, and when you put a stress in the environment you change the configuration and optical release of the porphyries, as the doctor Hammer said.
http://www.upenn.edu/pennnews/news/penn-molecular-scientists-develop-color-changing-stress-sensor
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